GST Invoice Under GST (Section 31 to 34): Tax Invoice, Bill of Supply, Debit Note, Credit Note, E-Invoicing & IRN

Introduction to GST Invoice

An invoice is one of the most important documents under the Goods and Services Tax (GST) regime. It is not merely a bill requesting payment from a customer—it is a legally recognized document that records the supply of goods or services, determines the tax liability of the supplier, and enables the recipient to claim Input Tax Credit (ITC). Without a valid GST invoice, a business may face compliance issues, penalties, and denial of ITC.

The GST law prescribes comprehensive provisions relating to invoices under Sections 31 to 34 of the Central Goods and Services Tax (CGST) Act, 2017, read with the relevant provisions of the CGST Rules, 2017. These provisions specify who is required to issue an invoice, when it should be issued, the mandatory particulars that must be included, and the rules governing related documents such as Bills of Supply, Receipt Vouchers, Debit Notes, Credit Notes, Revised Invoices, and E-Invoices.

A GST invoice serves several important purposes. It acts as documentary evidence of a taxable supply, helps determine the time of supply and tax liability, supports accounting and audit requirements, facilitates the recipient's claim of Input Tax Credit, and ensures transparency in business transactions. It also enables the Government to monitor tax compliance and reduce tax evasion through digital reporting mechanisms such as e-invoicing and QR codes.

The type of document that a registered person issues depends on the nature of the transaction. A registered taxpayer making taxable supplies generally issues a Tax Invoice, whereas a supplier dealing exclusively in exempt supplies or paying tax under the Composition Scheme issues a Bill of Supply. In addition, GST law provides for Receipt Vouchers for advances, Debit Notes where the taxable value or tax charged is less than required, Credit Notes where excess tax has been charged or goods are returned, and Revised Invoices for specified situations.

Over the years, the Government has further strengthened the invoicing framework by introducing E-Invoicing and Dynamic QR Codes. These digital initiatives help standardize invoice reporting, generate Invoice Reference Numbers (IRN), automate GST return filing, simplify E-Way Bill generation, improve accuracy, and significantly reduce fake invoicing and fraudulent Input Tax Credit claims.

For every registered business, issuing invoices correctly and within the prescribed time is essential. An incorrect invoice may result in disputes, interest liability, penalties, and denial of Input Tax Credit to customers. Therefore, understanding the GST invoice provisions is vital not only for tax compliance but also for maintaining smooth business operations.

In this comprehensive guide, we will explain every aspect of GST invoicing in simple language, including the legal provisions, types of GST documents, due dates for issuing invoices, mandatory invoice contents, Debit Notes, Credit Notes, Revised Invoices, E-Invoicing, Dynamic QR Codes, practical examples, compliance requirements, and frequently asked questions. Whether you are a business owner, accountant, tax professional, finance student, or GST practitioner, this guide will help you understand GST invoice provisions in a practical and easy-to-follow manner.

Meaning of Invoice under GST

A GST Invoice, commonly known as a Tax Invoice, is a legal document issued by a registered supplier to the recipient whenever a taxable supply of goods or services is made. It contains complete details of the transaction, including the supplier's and recipient's information, description of goods or services, quantity, value, applicable GST rate, tax amount, and other prescribed particulars.

A GST invoice is much more than a payment request. It is the primary document that establishes the tax liability of the supplier and enables the recipient to claim Input Tax Credit (ITC), subject to the conditions prescribed under the CGST Act, 2017.

Under Section 31 of the Central Goods and Services Tax (CGST) Act, 2017, every registered person supplying taxable goods or taxable services is required to issue a tax invoice in the prescribed manner and within the prescribed time. The format and contents of the invoice are further prescribed under the CGST Rules, 2017.

Simple Definition

A GST Invoice is an official tax document issued by a registered supplier that records the supply of taxable goods or services and specifies the GST charged on the transaction.

In simple words, a GST invoice acts as:

Proof that a taxable supply has taken place.
Evidence of the amount payable by the customer.
A document for collecting GST from the recipient.
The basis for claiming Input Tax Credit (ITC).
A record for GST return filing and departmental verification.

Why is a GST Invoice Important?

A GST invoice plays a crucial role in the GST system because it:

Establishes the occurrence of a taxable supply.
Determines the supplier's GST liability.
Allows the recipient to claim eligible Input Tax Credit.
Helps in preparing GST returns such as GSTR-1.
Creates transparency between the supplier, recipient, and tax authorities.
Serves as documentary evidence during audits, assessments, and inspections.
Supports e-invoicing and e-way bill generation wherever applicable.

Without a valid tax invoice, the recipient may not be able to claim Input Tax Credit even if GST has been paid by the supplier.

Legal Provision

The provisions relating to GST invoices are contained in:

Section 31 – Tax Invoice, Bill of Supply, Receipt Voucher, Revised Invoice and related documents.
Section 32 – Restriction on collection of tax by unregistered persons.
Section 33 – Mandatory indication of GST amount in tax invoices and other prescribed documents.
Section 34 – Debit Notes and Credit Notes.

Together, these provisions ensure that every taxable transaction is properly documented and reported under GST.

Essential Features of a GST Invoice

A valid GST invoice generally contains:

Name, address and GSTIN of the supplier.
Consecutive invoice number.
Date of issue.
Name, address and GSTIN/UIN of the recipient (where applicable).
Description of goods or services.
HSN Code or SAC Code, wherever applicable.
Quantity and unit (for goods).
Taxable value.
Applicable GST rate.
CGST, SGST/UTGST or IGST amount.
Total invoice value.
Place of supply (for inter-State transactions).
Signature or digital signature of the supplier or authorised representative (except in cases where signature is not required for computer-generated invoices).

Example of a GST Invoice

ABC Electronics Pvt. Ltd., Kolkata, sells one laptop to XYZ Technologies, Ranchi.

Particulars	Details
Taxable Value	₹50,000
GST Rate	18% IGST
IGST	₹9,000
Total Invoice Value	₹59,000

ABC Electronics issues a GST Tax Invoice mentioning all prescribed details. ABC reports the outward supply in its GST return, while XYZ Technologies can claim an Input Tax Credit of ₹9,000, subject to fulfilment of the conditions under the CGST Act.

Importance from the Recipient's Perspective

For the recipient, a GST invoice is essential because it:

Serves as proof of purchase.
Enables Input Tax Credit.
Supports accounting records.
Helps during GST audits and assessments.
Prevents disputes regarding tax charged.
Ensures compliance with GST documentation requirements.

Consequences of Not Issuing a Proper GST Invoice

Failure to issue a valid GST invoice may result in:

Penalty under the CGST Act.
Interest liability where applicable.
Denial of Input Tax Credit to the recipient.
Disputes during departmental audits.
Difficulty in filing GST returns.
Increased compliance risk and possible litigation.

Key Points

A GST Invoice is the primary legal document evidencing a taxable supply under GST.
It must be issued by every registered supplier making taxable supplies in accordance with Section 31 of the CGST Act, 2017.
It forms the foundation for tax collection, return filing, and Input Tax Credit.
A properly prepared GST invoice ensures transparency, legal compliance, and seamless business transactions.
Every business registered under GST should understand the invoicing provisions to avoid penalties and ensure smooth tax compliance.

Relevant Legal Provisions (Sections 31, 32, 33 & 34)

The GST invoicing framework in India is primarily governed by Sections 31 to 34 of the Central Goods and Services Tax (CGST) Act, 2017, read with the relevant provisions of the CGST Rules, 2017. These sections prescribe the legal requirements for issuing tax invoices, bills of supply, receipt vouchers, debit notes, credit notes, and other related documents.

Understanding these provisions is essential for every registered taxpayer because proper invoicing forms the foundation of GST compliance, tax collection, return filing, and Input Tax Credit (ITC).

Section 31 – Tax Invoice, Bill of Supply and Other Documents

Overview

Section 31 is the most important provision relating to GST invoicing. It specifies:

Who is required to issue a tax invoice.
When the invoice must be issued.
The circumstances in which a Bill of Supply should be issued.
Issuance of Receipt Voucher for advance payments.
Issuance of Revised Invoice after obtaining GST registration.
Invoice requirements for Reverse Charge Mechanism (RCM).

The detailed format and mandatory particulars of these documents are prescribed under the CGST Rules, 2017.

Purpose of Section 31

The objective of Section 31 is to ensure that every taxable supply is properly documented, tax is correctly collected, and the recipient is able to claim eligible Input Tax Credit.

Documents Covered under Section 31

Tax Invoice
Bill of Supply
Receipt Voucher
Refund Voucher
Payment Voucher
Revised Invoice
Invoice-cum-Bill of Supply
Documents relating to Reverse Charge Mechanism (RCM)

Example

ABC Traders sells machinery worth ₹2,00,000 plus GST to XYZ Industries.

Since the supply is taxable, ABC Traders must issue a Tax Invoice containing all prescribed particulars before or at the time specified under the GST law.

Section 32 – Prohibition on Unauthorized Collection of GST

Overview

Section 32 protects customers against illegal collection of GST.

It clearly provides that:

A person who is not registered under GST cannot collect GST from customers.
A registered person can collect GST only in accordance with the provisions of the CGST Act.

Objective

The section prevents unauthorized persons from collecting tax in the name of GST and safeguards Government revenue.

Practical Example

Mr. A operates a business without GST registration.

He issues an invoice showing:

Product Value: ₹10,000
GST @18%: ₹1,800

This is illegal because he is not registered under GST and therefore cannot collect GST from customers.

However, if XYZ Pvt. Ltd. is a registered supplier, it can legally collect GST by issuing a valid tax invoice.

Section 33 – Amount of Tax to be Indicated Separately

Overview

Whenever GST is payable on a supply, the supplier must clearly indicate the amount of tax charged in the tax invoice and other prescribed documents.

The tax amount should be prominently displayed so that the recipient knows:

Taxable value
GST rate
CGST
SGST/UTGST
IGST
Total invoice value

Objective

The purpose of this provision is to promote transparency in taxation and prevent hidden tax charges.

Example

Invoice Value:

Particulars	Amount
Taxable Value	₹50,000
CGST @9%	₹4,500
SGST @9%	₹4,500
Total Invoice Value	₹59,000

The GST amount must be shown separately rather than being merged into the selling price.

Section 34 – Debit Notes and Credit Notes

Overview

Business transactions often require correction after the original invoice has been issued.

Section 34 allows suppliers to issue:

Debit Note
Credit Note

to rectify such situations.

Debit Note

A Debit Note is issued when:

Taxable value charged in the original invoice is less than the actual value.
GST charged is less than the correct amount.
Additional quantity or value is supplied after issuing the original invoice.

Example

Original Invoice:

Taxable Value = ₹1,00,000

GST @18% = ₹18,000

Later it is found that the correct taxable value should have been ₹1,20,000.

The supplier issues a Debit Note for:

Additional Value = ₹20,000

Additional GST = ₹3,600

The additional tax liability is reported in the relevant GST return.

Credit Note

A Credit Note is issued when:

Excess taxable value has been charged.
Excess GST has been collected.
Goods are returned.
Services are cancelled.
Post-sale discount is allowed as per GST provisions.

Example

Original Invoice:

Taxable Value = ₹80,000

GST = ₹14,400

Customer returns goods worth ₹20,000.

The supplier issues a Credit Note for:

Taxable Value = ₹20,000

GST = ₹3,600

The supplier may reduce the output tax liability by reporting the Credit Note in the prescribed GST return, subject to the time limits under the GST Act.

Summary of Legal Provisions

Section	Subject	Purpose
Section 31	Tax Invoice, Bill of Supply, Receipt Voucher, Revised Invoice and related documents	Prescribes who should issue invoices and when they should be issued.
Section 32	Collection of GST	Prohibits unregistered persons from collecting GST and permits registered persons to collect tax only in accordance with the law.
Section 33	Display of GST Amount	Requires GST to be shown separately and prominently in invoices and other prescribed documents.
Section 34	Debit Note & Credit Note	Allows correction of taxable value or tax after the original invoice has been issued.

Why These Provisions Are Important

Sections 31 to 34 form the backbone of the GST invoicing system. They ensure that:

Every taxable supply is properly documented.
GST is collected only by authorised registered persons.
Tax is disclosed transparently on invoices.
Errors in invoices can be corrected through Debit Notes and Credit Notes.
Businesses maintain proper records for audits and GST compliance.
Recipients can claim eligible Input Tax Credit based on valid tax invoices.

A clear understanding of these legal provisions helps businesses avoid penalties, maintain accurate records, and ensure smooth compliance with the GST law.

Types of GST Documents

The Goods and Services Tax (GST) law prescribes various documents to ensure proper recording, reporting, and taxation of different business transactions. Depending on the nature of the supply, a registered person may be required to issue a Tax Invoice, Bill of Supply, Receipt Voucher, Refund Voucher, Payment Voucher, Delivery Challan, or Invoice-cum-Bill of Supply.

Each document has a specific purpose and must be issued in accordance with the provisions of the CGST Act, 2017 and the CGST Rules, 2017.

Understanding these GST documents is essential for maintaining compliance, claiming Input Tax Credit (ITC), and avoiding penalties.

Tax Invoice

A Tax Invoice is the primary document issued by a registered supplier for the supply of taxable goods or taxable services. It records the details of the transaction and specifies the GST charged on the supply.

A Tax Invoice enables:

Collection of GST from the customer.
Reporting of outward supplies.
Claim of Input Tax Credit (ITC) by the recipient.
Determination of the supplier's tax liability.

Who Should Issue a Tax Invoice?

A Tax Invoice must be issued by:

A registered person making taxable supplies.
A registered recipient liable to pay GST under the Reverse Charge Mechanism (RCM), wherever applicable under the GST provisions.

Example

ABC Electronics sells a laptop to XYZ Pvt. Ltd.

Particular	Amount
Laptop Price	₹50,000
GST @18%	₹9,000
Total Invoice	₹59,000

ABC Electronics issues a Tax Invoice showing the taxable value and GST separately.

Bill of Supply

A Bill of Supply is issued instead of a Tax Invoice when GST is not required to be collected on the transaction.

It is generally issued when:

The supplier deals exclusively in exempt goods or services.
The supplier pays tax under the Composition Scheme.

Since GST is not charged, a Bill of Supply does not contain tax details.

Who Should Issue a Bill of Supply?

A Bill of Supply is issued by:

Composition taxpayers.
Suppliers making exempt supplies.

Example

A doctor providing healthcare services, which are exempt from GST, issues a Bill of Supply instead of a Tax Invoice.

Similarly, a composition dealer selling grocery items issues a Bill of Supply because GST cannot be collected separately from customers.

Receipt Voucher

A Receipt Voucher is issued when a registered supplier receives advance payment against a future supply of goods or services.

The voucher serves as evidence that advance consideration has been received.

Purpose

Records receipt of advance.
Determines tax implications wherever applicable.
Maintains proper accounting records.

Example

XYZ Consultants receive an advance of ₹1,00,000 from a client for consultancy services to be provided next month.

Immediately upon receiving the advance, XYZ Consultants issue a Receipt Voucher.

Refund Voucher

A Refund Voucher is issued when an advance payment received earlier is refunded because the proposed supply does not take place.

It acts as documentary evidence of the refund.

When is it Issued?

Order cancelled.
Contract terminated.
Goods not supplied.
Services not provided.

Example

A customer pays ₹50,000 as advance for machinery.

Later, the order is cancelled.

The supplier refunds the advance and issues a Refund Voucher to record the transaction.

Payment Voucher

A Payment Voucher is issued by the recipient when GST is payable under the Reverse Charge Mechanism (RCM).

Under RCM, the recipient is liable to pay GST instead of the supplier.

Purpose

Records payment made to the supplier.
Supports GST payment under Reverse Charge.
Forms part of GST compliance records.

Example

ABC Pvt. Ltd. receives legal services from an advocate, which are taxable under Reverse Charge.

ABC Pvt. Ltd. issues a Payment Voucher while making payment to the advocate and pays GST under RCM.

Delivery Challan

A Delivery Challan is issued when goods are transported without issuing a Tax Invoice.

This generally happens when there is movement of goods without an actual sale.

Common Situations

Job work.
Transportation of goods for exhibition.
Goods sent for approval.
Supply of liquid gas where quantity is not known at dispatch.
Other situations permitted under GST Rules.

Example

A manufacturer sends raw materials to a job worker for processing.

Since ownership is not transferred, the manufacturer issues a Delivery Challan instead of a Tax Invoice.

Invoice-cum-Bill of Supply

Sometimes a registered person supplies both:

Taxable goods or services, and
Exempt goods or services

to the same unregistered customer.

Instead of issuing two separate documents, GST law permits the supplier to issue a single Invoice-cum-Bill of Supply.

This simplifies documentation and reduces compliance.

Example

A stationery shop sells:

Taxable office files worth ₹5,000.
Exempt educational books worth ₹2,000.

Both supplies are made to an unregistered customer.

The supplier can issue one Invoice-cum-Bill of Supply covering both taxable and exempt items.

Comparison of GST Documents

GST Document	Purpose	Who Issues It	GST Charged?
Tax Invoice	Taxable supply	Registered supplier	Yes
Bill of Supply	Exempt supply or Composition Scheme	Registered supplier	No
Receipt Voucher	Receipt of advance	Registered supplier	As applicable under GST provisions
Refund Voucher	Refund of advance	Registered supplier	Adjustment of advance
Payment Voucher	Payment under Reverse Charge	Recipient liable under RCM	Yes (paid by recipient)
Delivery Challan	Movement of goods without sale	Registered supplier	No
Invoice-cum-Bill of Supply	Taxable and exempt supplies to the same unregistered customer	Registered supplier	Partly taxable and partly exempt

Key Points

GST law prescribes different documents for different business transactions.
A Tax Invoice is used for taxable supplies.
A Bill of Supply is issued for exempt supplies and by composition taxpayers.
Receipt Voucher records advances received.
Refund Voucher records refunds of advances.
Payment Voucher is issued by the recipient under the Reverse Charge Mechanism.
Delivery Challan facilitates movement of goods without an actual sale.
Invoice-cum-Bill of Supply simplifies documentation when taxable and exempt supplies are made together to an unregistered customer.
Issuing the correct GST document at the correct time is essential for compliance, proper accounting, and smooth GST return filing.

Who Should Issue a Tax Invoice?

A Tax Invoice is one of the most important documents under the GST regime. It is the legal document through which a registered supplier records the supply of taxable goods or services and collects GST from the recipient.

The provisions relating to the issuance of a Tax Invoice are primarily contained in Section 31 of the Central Goods and Services Tax (CGST) Act, 2017, read with the relevant provisions of the CGST Rules, 2017.

Every person making taxable supplies should understand whether they are legally required to issue a Tax Invoice, as failure to do so may result in penalties, denial of Input Tax Credit (ITC) to the recipient, and other compliance issues.

Registered Person Making Taxable Supplies

A registered person supplying taxable goods or taxable services under the regular GST scheme is required to issue a Tax Invoice.

The invoice should be issued within the prescribed time and must contain all mandatory particulars prescribed under the GST Rules.

Example

ABC Electronics Pvt. Ltd., registered under GST, sells laptops worth ₹80,000 to XYZ Pvt. Ltd.

Invoice Details:

Particular	Amount
Taxable Value	₹80,000
GST @18%	₹14,400
Total Invoice Value	₹94,400

ABC Electronics must issue a Tax Invoice to XYZ Pvt. Ltd.

Registered Recipient Liable Under Reverse Charge Mechanism (RCM)

In certain notified cases, GST is payable by the recipient instead of the supplier under the Reverse Charge Mechanism (RCM).

Where required under the GST provisions, the registered recipient must issue the prescribed invoice or self-invoice and comply with the documentation requirements applicable to reverse charge transactions.

This ensures that GST liability under RCM is properly documented and reported.

Example

ABC Pvt. Ltd. receives legal services from an advocate that are liable to GST under Reverse Charge.

Since the supplier is not required to charge GST, ABC Pvt. Ltd. complies with the prescribed documentation requirements and pays GST under RCM.

Persons Not Required to Issue a Tax Invoice

Not every registered person issues a Tax Invoice.

The following persons generally issue other prescribed documents instead:

(A) Composition Taxpayer

A taxpayer registered under the Composition Scheme cannot collect GST separately from customers.

Instead of a Tax Invoice, such a person issues a Bill of Supply.

Example

A composition dealer operating a grocery shop sells goods worth ₹12,000.

The dealer issues a Bill of Supply, not a Tax Invoice.

(B) Supplier of Exempt Goods or Services

A person supplying wholly exempt goods or services is not required to issue a Tax Invoice.

Instead, a Bill of Supply must be issued.

Example

A hospital provides healthcare services that are exempt from GST.

The hospital issues a Bill of Supply.

(C) Unregistered Person

A person who is not registered under GST cannot issue a Tax Invoice or collect GST from customers.

Issuing an invoice showing GST without registration is prohibited under Section 32 of the CGST Act, 2017.

Example

Mr. A operates a business without GST registration.

He cannot issue an invoice charging GST to customers.

Importance of Issuing a Proper Tax Invoice

A valid Tax Invoice helps to:

Collect GST legally from customers.
Enable the recipient to claim eligible Input Tax Credit (ITC).
Determine the supplier's tax liability.
Support GST return filing.
Maintain proper accounting records.
Facilitate audits and departmental verification.
Avoid penalties for non-compliance.

Summary Table

Person	Tax Invoice Required?	Document to be Issued
Registered supplier making taxable supplies	Yes	Tax Invoice
Registered recipient liable under Reverse Charge (where prescribed)	Yes	Self-invoice/Invoice and other prescribed RCM documents
Composition taxpayer	No	Bill of Supply
Supplier of exempt goods or services	No	Bill of Supply
Unregistered person	No	Cannot issue Tax Invoice or collect GST

Key Points

Every registered person making taxable supplies under the regular GST scheme must issue a Tax Invoice.
In specified Reverse Charge Mechanism (RCM) cases, the registered recipient must comply with the prescribed invoicing requirements.
Composition taxpayers and suppliers dealing exclusively in exempt supplies issue a Bill of Supply instead of a Tax Invoice.
Unregistered persons are prohibited from collecting GST or issuing Tax Invoices.
Issuing a correct and timely Tax Invoice is essential for GST compliance, proper tax collection, and allowing eligible recipients to claim Input Tax Credit.

Who Should Issue a Bill of Supply?

A Bill of Supply is a GST document issued by a registered person when GST is not required to be charged on the supply. Unlike a Tax Invoice, a Bill of Supply does not contain details of GST such as CGST, SGST, UTGST, or IGST because no tax is collected from the recipient.

The provisions relating to the Bill of Supply are contained in Section 31(3)(c) of the Central Goods and Services Tax (CGST) Act, 2017, read with Rule 49 of the CGST Rules, 2017.

A Bill of Supply serves as documentary evidence of the supply and helps maintain proper accounting records while ensuring compliance with GST law.

Registered Person Supplying Exempt Goods or Services

A registered person supplying wholly exempt goods or services is required to issue a Bill of Supply instead of a Tax Invoice.

Since exempt supplies are not subject to GST, the supplier cannot collect GST from the customer.

Examples of Exempt Supplies

Healthcare services provided by hospitals and doctors (subject to GST exemptions)
Educational services provided by eligible educational institutions
Specified agricultural services
Other supplies exempt through GST notifications

Example

ABC Hospital provides medical treatment to a patient and charges ₹15,000.

As healthcare services are exempt from GST (subject to applicable exemptions), ABC Hospital issues a Bill of Supply instead of a Tax Invoice.

Registered Person Paying Tax Under the Composition Scheme

A taxpayer registered under the Composition Scheme is also required to issue a Bill of Supply.

Composition taxpayers pay GST at a concessional rate on their turnover but cannot collect GST separately from customers.

Therefore, they are prohibited from issuing a Tax Invoice.

Example

Mr. Raj operates a grocery store under the Composition Scheme.

He sells goods worth ₹8,500 to a customer.

Instead of issuing a Tax Invoice, he issues a Bill of Supply, as GST cannot be charged separately.

Why Composition Taxpayers Cannot Issue a Tax Invoice

A Composition taxpayer:

Pays GST from their own turnover.
Cannot collect GST separately from customers.
Cannot pass Input Tax Credit (ITC) to the recipient.
Must issue a Bill of Supply for every eligible transaction.

This simplifies compliance for small taxpayers while clearly informing customers that no GST has been charged separately.

Contents of a Bill of Supply

A Bill of Supply generally contains:

Name, address and GSTIN of the supplier
Consecutive serial number
Date of issue
Name, address and GSTIN/UIN of the recipient (where applicable)
Description of goods or services
Value of goods or services
Signature or digital signature of the supplier or authorised representative (where applicable)
A declaration where required, such as: "Composition taxable person, not eligible to collect tax on supplies." (for composition taxpayers)

Unlike a Tax Invoice, it does not show GST separately.

Difference Between Tax Invoice and Bill of Supply

Particular	Tax Invoice	Bill of Supply
Issued for	Taxable supplies	Exempt supplies and Composition Scheme supplies
GST Charged	Yes	No
Input Tax Credit Available to Recipient	Yes, subject to conditions	No
Applicable to Composition Taxpayer	No	Yes
Applicable to Exempt Supplies	No	Yes

Practical Examples

Example 1 – Exempt Supply

A registered charitable trust provides exempt educational training and charges ₹20,000.

The trust issues a Bill of Supply because GST is not applicable.

Example 2 – Composition Dealer

XYZ Traders is registered under the Composition Scheme.

The business sells household goods worth ₹12,000.

The customer receives a Bill of Supply, and no GST is charged separately.

Example 3 – Taxable Supply

ABC Electronics sells a television worth ₹30,000 plus GST.

Since the supply is taxable, ABC Electronics must issue a Tax Invoice, not a Bill of Supply.

Summary Table

Type of Supplier	Document to be Issued
Registered supplier making taxable supplies	Tax Invoice
Registered supplier making wholly exempt supplies	Bill of Supply
Composition taxpayer	Bill of Supply
Unregistered person	No GST document under the Act

Key Points

A Bill of Supply is issued when GST is not collected on the transaction.
It is mandatory for registered persons making exempt supplies.
It is also mandatory for taxpayers registered under the Composition Scheme.
A Bill of Supply does not contain GST amounts because no tax is charged separately.
Composition taxpayers cannot issue Tax Invoices or pass on Input Tax Credit to customers.
Issuing the correct document ensures compliance with the CGST Act, 2017, and helps maintain accurate business records.

Time Limit for Issuing Invoice

Issuing a GST invoice within the prescribed time is one of the most important compliance requirements under the Central Goods and Services Tax (CGST) Act, 2017. A delay in issuing an invoice may result in incorrect determination of the Time of Supply, delayed payment of GST, interest liability, penalties, and compliance issues.

The time limit for issuing invoices is prescribed under Section 31 of the CGST Act, 2017, read with the relevant provisions of the CGST Rules, 2017. The prescribed time varies depending on whether the supply relates to goods, services, continuous supplies, sale on approval basis, or transactions covered under the Reverse Charge Mechanism (RCM).

Time Limit for Supply of Goods

The time of issuing a Tax Invoice for goods depends on whether the transaction involves the movement (removal) of goods.

(A) Where Supply Involves Removal of Goods

If the supply involves transportation or removal of goods, the supplier must issue the Tax Invoice:

Before or at the time of removal of goods for delivery to the recipient.

Example

ABC Electronics sells 100 LED televisions to XYZ Traders.

The televisions leave ABC's warehouse on 10 July 2026.

ABC must issue the Tax Invoice on or before 10 July 2026, i.e., before or at the time the goods are removed.

(B) Where Supply Does Not Involve Removal of Goods

If there is no physical movement of goods, the invoice must be issued:

Before or at the time of delivery or making the goods available to the recipient.

Example

XYZ Ltd. sells a heavy machine already installed at the buyer's factory.

Since the machine is not moved, the invoice should be issued before or at the time ownership is transferred or the machine is made available to the buyer.

Summary – Supply of Goods

Nature of Supply	Time for Issuing Invoice
Supply involving removal of goods	Before or at the time of removal
Supply not involving removal of goods	Before or at the time of delivery or making the goods available

Time Limit for Supply of Services

For taxable services, the supplier is generally required to issue the Tax Invoice:

Before providing the service, or
Within 30 days from the date of providing the service.

For banking companies, financial institutions (including NBFCs), and insurance companies, the time limit is 45 days from the date of supply of the service.

Example

ABC Consultancy completes consultancy services on 15 August 2026.

The company must issue the Tax Invoice on or before 14 September 2026 (within 30 days).

Example – Banking Company

A bank provides loan processing services on 1 August 2026.

The bank can issue the Tax Invoice up to 45 days from the date of supply.

Summary – Supply of Services

Supplier	Time for Issuing Invoice
Normal supplier of services	Before or within 30 days after the supply of service
Banking company, financial institution, NBFC or insurer	Before or within 45 days after the supply of service

Time Limit for Continuous Supply

Certain businesses supply goods or services on a continuous or recurring basis under long-term contracts. GST provides special rules for such supplies.

(A) Continuous Supply of Goods

Where Payment is Linked to Periodic Statements of Account

The invoice must be issued on or before the date each statement of account is issued.

Where Payment is Received on an Account Basis

The invoice must be issued on or before the date each payment is received.

Example

A gas supplier issues a monthly statement to an industrial customer on the last day of every month.

The Tax Invoice should be issued on or before the date of the monthly statement.

(B) Continuous Supply of Services

Case 1 – Due Date of Payment is Specified in the Contract

The invoice must be issued on or before the due date of payment.

Example

A maintenance contract requires payment on the 10th of every month.

The supplier must issue the invoice on or before the 10th of each month.

Case 2 – Due Date Cannot Be Determined

If the contract does not specify a due date, the invoice must be issued before or at the time the payment is received.

Example

A software consultant receives payment whenever the client releases funds.

The invoice should be issued before or at the time of receipt of payment.

Case 3 – Payment Linked to Completion of an Event

Where payment depends on achieving a specific milestone, the invoice must be issued on or before the date the event is completed.

Example

A contractor receives payment after completing the foundation work of a building.

The invoice should be issued on or before completion of the foundation work.

Case 4 – Contract Ends Before Completion

If the supply of services stops before the contract is completed, the invoice must be issued at the time the supply ceases, to the extent of services provided up to that date.

Example

A one-year consultancy agreement is terminated after six months.

The consultant must issue the invoice for services rendered up to the date of termination.

Summary – Continuous Supply

Situation	Time for Issuing Invoice
Goods – Statement of account	On or before the statement date
Goods – Payment received	On or before receipt of payment
Services – Due date specified	On or before due date
Services – Due date not specified	Before or at receipt of payment
Services – Payment linked to an event	On or before completion of the event
Services – Contract terminated	At the time the supply ceases

Time Limit for Sale on Approval Basis

In a Sale on Approval transaction, goods are sent to the customer for inspection or trial before the customer decides whether to purchase them.

Under GST, the supplier must issue the Tax Invoice:

Before or at the time the customer accepts the goods, or
Within six months from the date of removal of the goods, whichever is earlier.

Example

ABC Furniture sends office chairs to XYZ Ltd. on 1 January 2026 on an approval basis.

XYZ accepts the chairs on 20 January 2026.

ABC must issue the invoice on or before 20 January 2026.

If XYZ does not communicate acceptance, ABC must issue the invoice before the expiry of six months from 1 January 2026, whichever occurs earlier.

Time Limit under Reverse Charge Mechanism (RCM)

Under the Reverse Charge Mechanism (RCM), the recipient is liable to pay GST instead of the supplier for specified supplies.

Where the recipient is required to issue the prescribed invoice or self-invoice under RCM, it should be prepared on the date of receipt of the goods or services, as applicable, in accordance with the GST provisions.

Example

ABC Pvt. Ltd. receives legal services from an advocate covered under RCM.

ABC prepares the required documentation on the date the services are received and discharges the GST liability under Reverse Charge.

Summary Table – Time Limit for Issuing Invoice

Nature of Supply	Time Limit
Goods involving removal	Before or at the time of removal of goods
Goods without removal	Before or at the time goods are delivered or made available
Services	Before or within 30 days after the supply (45 days for banks, financial institutions, NBFCs and insurers)
Continuous supply of goods	On or before the statement date or receipt of payment, as applicable
Continuous supply of services	Based on due date, payment receipt, milestone completion, or cessation of supply
Sale on approval	Before or at acceptance or within six months from removal, whichever is earlier
Reverse Charge Mechanism (RCM)	As prescribed for the recipient under RCM, generally on receipt of goods or services

Key Points

Section 31 prescribes different timelines for issuing invoices depending on the nature of the supply.
For goods, the invoice is generally issued before or at the time of removal or delivery.
For services, the invoice should normally be issued before or within 30 days of the supply (45 days for banking companies, financial institutions, NBFCs and insurers).
Continuous supplies have separate rules depending on contractual payment terms and milestones.
In a sale on approval, the invoice must be issued before or at acceptance or within six months from the date of removal, whichever is earlier.
Transactions covered under the Reverse Charge Mechanism (RCM) require compliance with the specific invoicing provisions applicable to the recipient.
Issuing invoices within the prescribed time helps ensure timely GST payment, proper Input Tax Credit flow, and full compliance with GST law.

Manner of Issuing GST Invoice

Issuing a GST invoice is not only about preparing an invoice with the correct details but also about following the prescribed manner under the CGST Act, 2017 and the CGST Rules, 2017. The law specifies how many copies of an invoice should be prepared, how they should be marked, and the situations in which digital or computer-generated invoices are acceptable.

Proper issuance of invoices ensures smooth movement of goods, accurate accounting, proper GST return filing, and seamless claim of Input Tax Credit (ITC) by the recipient.

Legal Provision

The manner of issuing GST invoices is governed by:

Section 31 of the Central Goods and Services Tax (CGST) Act, 2017
Rule 46 to Rule 48 of the CGST Rules, 2017

These provisions prescribe:

Number of invoice copies.
Distribution of invoice copies.
Electronic and computer-generated invoices.
E-Invoicing requirements for specified taxpayers.

Manner of Issuing Invoice for Supply of Goods

For the supply of goods, a Tax Invoice must be prepared in triplicate.

Each copy has a specific purpose.

Copy	Marking	Purpose
Original Copy	Original for Recipient	Given to the buyer for accounting and claiming Input Tax Credit (ITC).
Duplicate Copy	Duplicate for Transporter	Carried during transportation of goods (where applicable) to facilitate verification.
Triplicate Copy	Triplicate for Supplier	Retained by the supplier for accounting, audit, and GST records.

Example

ABC Traders sells machinery to XYZ Industries.

ABC prepares three copies of the invoice:

Original – Handed over to XYZ Industries.
Duplicate – Accompanies the goods during transportation (where required).
Triplicate – Kept by ABC Traders for its records.

Manner of Issuing Invoice for Supply of Services

For the supply of services, the Tax Invoice must be prepared in duplicate.

Copy	Marking	Purpose
Original Copy	Original for Recipient	Given to the customer.
Duplicate Copy	Duplicate for Supplier	Retained by the supplier for records and GST compliance.

Since services do not involve physical movement of goods, a transporter's copy is not required.

Example

XYZ Consultants provides consultancy services worth ₹1,00,000 to ABC Ltd.

The consultant prepares:

Original – Issued to ABC Ltd.
Duplicate – Retained for business records.

Distribution of Invoice Copies

The GST Rules require that each invoice copy be clearly identified to avoid confusion.

For Goods

Original for Recipient
Duplicate for Transporter
Triplicate for Supplier

For Services

Original for Recipient
Duplicate for Supplier

Proper distribution ensures smooth documentation during audits, transportation, and GST assessments.

Computer-Generated GST Invoices

Modern businesses commonly generate invoices using accounting software or Enterprise Resource Planning (ERP) systems.

GST law permits computer-generated invoices.

Where an invoice is generated electronically in accordance with the GST Rules, a physical signature is not mandatory, provided it complies with the prescribed requirements.

Advantages

Faster invoice generation.
Reduced manual errors.
Easy digital storage and retrieval.
Integration with accounting software.
Simplified GST return preparation.

Example

ABC Pvt. Ltd. uses accounting software to generate GST invoices.

The invoices are automatically numbered and stored digitally. As permitted under the GST Rules, a manually written signature is not required on such computer-generated invoices.

Electronic Invoices (E-Invoices)

Specified classes of registered persons are required to generate E-Invoices by uploading invoice details to the Government's Invoice Registration Portal (IRP).

After successful validation, the portal generates:

Invoice Reference Number (IRN)
Digitally signed invoice
QR Code

These invoices are considered valid GST invoices and facilitate automated GST return filing and E-Way Bill generation.

(The detailed provisions relating to E-Invoicing are discussed in a separate chapter of this blog.)

Best Practices While Issuing GST Invoices

Businesses should follow these practices:

Use consecutive serial numbers.
Mention the correct date of issue.
Verify GSTINs of supplier and recipient.
Mention HSN/SAC codes wherever applicable.
Clearly disclose taxable value and GST.
Maintain separate records for cancelled invoices.
Preserve invoices for the period prescribed under GST law.
Use accounting software to reduce compliance errors.

Practical Illustration

ABC Electronics Pvt. Ltd. sells air conditioners worth ₹2,00,000 to XYZ Traders.

Since the transaction involves the movement of goods:

ABC prepares three copies of the invoice.

Copy	Given To
Original	XYZ Traders
Duplicate	Transporter carrying the goods (where applicable)
Triplicate	ABC Electronics' Accounts Department

If ABC provides annual maintenance services instead of selling goods, only two copies of the invoice are prepared.

Difference Between Goods and Services

Particular	Goods	Services
Number of Invoice Copies	Three	Two
Transporter's Copy	Required (where applicable)	Not Required
Supplier's Copy	Yes	Yes
Recipient's Copy	Yes	Yes

Key Points

GST law prescribes the manner in which invoices must be issued for both goods and services.
A Tax Invoice for goods is prepared in triplicate:

Original for Recipient
Duplicate for Transporter (where applicable)
Triplicate for Supplier

A Tax Invoice for services is prepared in duplicate:

Original for Recipient
Duplicate for Supplier

Computer-generated invoices are valid under GST, and a physical signature is generally not required if the prescribed conditions are satisfied.
Businesses should maintain proper invoice records and follow the prescribed format to ensure compliance, facilitate Input Tax Credit, and avoid disputes during GST audits.

Mandatory Particulars of Tax Invoice

A Tax Invoice is a legal document that records the supply of taxable goods or services under the GST regime. To ensure uniformity, transparency, and proper tax compliance, every Tax Invoice must contain certain mandatory particulars prescribed under Rule 46 of the Central Goods and Services Tax (CGST) Rules, 2017.

A Tax Invoice that does not contain the prescribed details may result in non-compliance, denial of Input Tax Credit (ITC) to the recipient, and penalties under the GST law.

Legal Provision

The mandatory particulars of a GST Tax Invoice are prescribed under:

Section 31 of the CGST Act, 2017
Rule 46 of the CGST Rules, 2017

Every registered person making taxable supplies is required to issue a Tax Invoice containing all the prescribed particulars.

Mandatory Particulars of a GST Tax Invoice

1. Name, Address and GSTIN of the Supplier

The invoice must contain:

Legal name of the supplier.
Complete business address.
GST Identification Number (GSTIN).

Example

ABC Electronics Pvt. Ltd.

45 Park Street, Kolkata – 700016

GSTIN: 19ABCDE1234F1Z5

2. Consecutive Serial Number

Every invoice must have a unique serial number.

The serial number:

Should not exceed 16 characters.
May contain alphabets, numerals, hyphens (-), slashes (/), or combinations thereof.
Must be unique for a financial year.

Example

INV/2026-27/000125

3. Date of Issue

The invoice must clearly mention the date on which it is issued.

This date is important for:

Determining the Time of Supply.
GST return filing.
Audit and assessment.
Limitation periods under GST.

Example

Invoice Date:

15 July 2026

4. Name, Address and GSTIN/UIN of the Recipient

Where the recipient is registered, the invoice must contain:

Name.
Address.
GSTIN or Unique Identity Number (UIN).

Example

XYZ Industries Ltd.

Ranchi, Jharkhand

GSTIN: 20XYZAB5678K1Z3

5. Name and Address of Unregistered Recipient

Where the recipient is not registered and the invoice value exceeds the prescribed limit, the invoice should contain:

Name of the recipient.
Address.
State name and State code.
Place of Supply (for inter-State transactions).
Delivery address, if different.

Example

Mr. Rahul Sharma

Patna, Bihar

State Code: 10

6. HSN Code or SAC Code

The invoice should mention:

HSN (Harmonised System of Nomenclature) for goods.
SAC (Services Accounting Code) for services.

The level of HSN/SAC reporting depends on the turnover limits and applicable GST notifications.

Example

Laptop

HSN: 8471

Consultancy Service

SAC: 998312

7. Description of Goods or Services

The invoice should clearly describe the goods or services supplied.

The description should be sufficiently detailed to identify the nature of the supply.

Example

Dell Inspiron Laptop
GST Consultancy Services
Office Furniture
Steel Pipes

8. Quantity and Unit (Applicable to Goods)

For goods, the invoice should specify:

Quantity supplied.
Unit of measurement.

Example

Goods	Quantity	Unit
Laptop	10	Nos.
Cement	500	Bags

9. Total Value of Supply

The invoice must mention the total value before considering discounts, where applicable.

Example

Total Value

₹2,50,000

10. Taxable Value

The taxable value is calculated after deducting eligible discounts from the total value.

GST is computed on this amount.

Example

Particular	Amount
Total Value	₹1,00,000
Less: Trade Discount	₹5,000
Taxable Value	₹95,000

11. Rate of GST

The applicable GST rate must be mentioned.

This may include:

CGST
SGST
UTGST
IGST
Compensation Cess (where applicable)

Example

GST Rate:

18%

CGST 9%

SGST 9%

12. Amount of GST

The invoice should separately mention:

CGST Amount
SGST Amount
IGST Amount
UTGST Amount (where applicable)
Compensation Cess

Example

Tax	Amount
CGST @9%	₹9,000
SGST @9%	₹9,000
Total GST	₹18,000

13. Place of Supply

In case of inter-State supplies, the invoice must mention:

Place of Supply.
Name of the State.

This helps determine whether IGST is applicable.

Example

Place of Supply:

Jharkhand

14. Delivery Address

Where the place of delivery differs from the recipient's registered address, the delivery address should also be mentioned.

Example

Registered Office:

Kolkata

Delivery Address:

Jamshedpur Warehouse

15. Whether Tax is Payable under Reverse Charge

The invoice must specify whether GST is payable under the Reverse Charge Mechanism (RCM).

Generally, the invoice carries a declaration such as:

"Tax payable on Reverse Charge: Yes/No"

16. Signature or Digital Signature

The Tax Invoice should be authenticated by:

Signature of the supplier or authorised representative, or
Digital signature.

However, computer-generated invoices issued in accordance with the GST Rules generally do not require a physical signature.

Practical Example of a GST Tax Invoice

Particular	Details
Supplier	ABC Electronics Pvt. Ltd.
GSTIN	19ABCDE1234F1Z5
Invoice No.	INV-1025
Invoice Date	15 July 2026
Recipient	XYZ Industries Ltd.
GSTIN	20XYZAB5678K1Z3
Goods	Laptop
HSN	8471
Quantity	5 Nos.
Taxable Value	₹2,50,000
IGST @18%	₹45,000
Total Invoice Value	₹2,95,000

Summary Table – Mandatory Particulars

Sl. No.	Particular
1	Supplier's Name, Address and GSTIN
2	Unique Invoice Number
3	Date of Issue
4	Recipient's Name, Address and GSTIN/UIN
5	Name and Address of Unregistered Recipient (where applicable)
6	HSN or SAC Code
7	Description of Goods or Services
8	Quantity and Unit (for goods)
9	Total Value
10	Taxable Value
11	GST Rate
12	CGST, SGST, IGST, UTGST and Cess Amount
13	Place of Supply (for inter-State supplies)
14	Delivery Address (if different)
15	Reverse Charge Declaration
16	Signature or Digital Signature (where applicable)

Importance of Including Mandatory Particulars

A Tax Invoice containing all prescribed particulars:

Ensures compliance with GST law.
Enables the recipient to claim eligible Input Tax Credit (ITC).
Helps determine the correct tax liability.
Supports GST return filing.
Facilitates audits and departmental verification.
Reduces disputes and compliance risks.

Failure to include the mandatory particulars may result in rejection of the invoice for ITC purposes, notices from the GST department, interest, penalties, and avoidable litigation.

Key Points

Rule 46 of the CGST Rules, 2017 prescribes the mandatory particulars of a GST Tax Invoice.
Every registered person making taxable supplies must issue a Tax Invoice containing all prescribed details.
The invoice should clearly disclose supplier details, recipient details, invoice number, date, HSN/SAC, taxable value, GST rate, tax amount, Place of Supply, and other statutory information.
A complete and accurate Tax Invoice is the foundation for GST compliance, seamless Input Tax Credit flow, and proper accounting.

Mandatory Particulars of Bill of Supply

A Bill of Supply is a GST document issued instead of a Tax Invoice when a registered person is not permitted or not required to collect GST from the recipient. It is commonly issued by taxpayers registered under the Composition Scheme and by suppliers making wholly exempt supplies.

Although GST is not charged separately, the Bill of Supply must contain certain mandatory particulars prescribed under Rule 49 of the Central Goods and Services Tax (CGST) Rules, 2017. These particulars help establish the authenticity of the transaction, maintain proper accounting records, and ensure compliance with GST law.

Legal Provision

The provisions relating to a Bill of Supply are contained in:

Section 31(3)(c) of the CGST Act, 2017
Rule 49 of the CGST Rules, 2017

Every registered person issuing a Bill of Supply must ensure that the document contains all the prescribed particulars.

Mandatory Particulars of a Bill of Supply

1. Name, Address and GSTIN of the Supplier

The Bill of Supply must clearly mention:

Legal name of the supplier
Principal place of business
GST Identification Number (GSTIN)

Example

ABC Traders

Park Street, Kolkata

GSTIN: 19ABCDE1234F1Z5

2. Consecutive Serial Number

Every Bill of Supply must contain a unique serial number.

The serial number:

Should not exceed 16 characters.
May contain alphabets, numerals, hyphens (-), slashes (/), or combinations thereof.
Must be unique for a financial year.

Example

BOS/2026-27/00125

3. Date of Issue

The date on which the Bill of Supply is issued must be clearly mentioned.

This helps determine:

The accounting period.
GST compliance.
Audit records.

Example

Date: 15 July 2026

4. Name, Address and GSTIN/UIN of the Recipient (Where Applicable)

If the recipient is registered, the Bill of Supply should contain:

Name
Address
GSTIN or UIN

Where the recipient is unregistered, these particulars may be mentioned wherever applicable.

Example

XYZ Enterprises

Ranchi, Jharkhand

GSTIN: 20ABCDE5678F1Z3

5. HSN Code or SAC Code

The Bill of Supply should contain:

HSN Code for goods.
SAC Code for services,

wherever applicable under the GST Rules and notifications.

Example

Goods:

Rice

HSN: 1006

Service:

Educational Training

SAC: 999293

6. Description of Goods or Services

A clear description of the goods or services supplied should be mentioned.

Example

Printed Books
Grocery Items
Educational Services
Healthcare Services

7. Value of Goods or Services

The Bill of Supply should specify the total value of goods or services supplied.

Since GST is not charged separately, the amount shown is generally the amount payable by the customer.

Example

Value of Supply:

₹25,000

8. Signature or Digital Signature

The Bill of Supply should be authenticated by:

Signature of the supplier or authorised representative, or
Digital signature.

However, computer-generated Bills of Supply issued in accordance with the GST Rules generally do not require a physical signature.

9. Declaration by Composition Taxpayer

Where the supplier is registered under the Composition Scheme, the Bill of Supply should contain the prescribed declaration:

"Composition taxable person, not eligible to collect tax on supplies."

This informs the recipient that:

GST has not been charged separately.
Input Tax Credit (ITC) cannot be claimed on such supplies.

Practical Example of a Bill of Supply

Supplier: XYZ Grocery Store (Composition Taxpayer)

Particular	Details
Bill No.	BOS-1025
Date	20 July 2026
Customer	Mr. Rahul Sharma
Goods	Grocery Items
HSN Code	2106
Value	₹8,500
GST	Not Applicable
Total Amount	₹8,500
Declaration	Composition taxable person, not eligible to collect tax on supplies.

Difference Between Tax Invoice and Bill of Supply

Particular	Tax Invoice	Bill of Supply
Issued By	Registered supplier making taxable supplies	Composition taxpayer or supplier of exempt supplies
GST Charged	Yes	No
GST Amount Shown	Yes	No
ITC Available to Recipient	Yes (subject to conditions)	No
Mandatory Declaration	Not required	Required for composition taxpayers

Summary Table – Mandatory Particulars of Bill of Supply

Sl. No.	Particular
1	Supplier's Name, Address and GSTIN
2	Consecutive Serial Number
3	Date of Issue
4	Recipient's Name, Address and GSTIN/UIN (where applicable)
5	HSN Code or SAC Code (where applicable)
6	Description of Goods or Services
7	Value of Goods or Services
8	Signature or Digital Signature (where applicable)
9	Composition declaration (for composition taxpayers)

Importance of a Proper Bill of Supply

A properly prepared Bill of Supply:

Ensures compliance with the CGST Act and Rules.
Serves as proof of the transaction.
Helps maintain accurate accounting records.
Supports GST audits and departmental verification.
Clearly informs the customer that GST has not been charged separately.
Reduces disputes and compliance risks.

Key Points

A Bill of Supply is issued instead of a Tax Invoice for exempt supplies and by Composition Scheme taxpayers.
Rule 49 of the CGST Rules, 2017 prescribes the mandatory particulars that must be included.
Unlike a Tax Invoice, a Bill of Supply does not contain GST rates or tax amounts because no tax is collected from the recipient.
Composition taxpayers should include the prescribed declaration stating that they are not eligible to collect tax on supplies.
Maintaining a complete and accurate Bill of Supply is essential for GST compliance, proper accounting, and smooth business operations.

Revised Invoice

A Revised Invoice is a special type of GST invoice that allows a newly registered taxpayer to replace invoices issued before receiving the GST Registration Certificate (RC). It ensures that supplies made during the interim period are properly documented under GST and enables eligible recipients to claim Input Tax Credit (ITC).

The provisions relating to the Revised Invoice are contained in Section 31 of the Central Goods and Services Tax (CGST) Act, 2017, read with the relevant provisions of the CGST Rules, 2017.

A Revised Invoice is particularly useful because GST registration is often granted with retrospective effect from the effective date of registration, whereas the Registration Certificate may be issued later. During this gap, the supplier may have already made taxable supplies. The law therefore permits the supplier to issue Revised Invoices for those transactions.

What is a Revised Invoice?

A Revised Invoice is a fresh GST invoice issued in place of an earlier invoice for supplies made during the period:

From the effective date of GST registration, and
Up to the date on which the Registration Certificate (RC) is issued.

The Revised Invoice replaces the earlier invoice and serves as the valid GST Tax Invoice for the transaction.

Legal Provision

The provisions relating to Revised Invoices are contained in:

Section 31 of the CGST Act, 2017
Relevant provisions of the CGST Rules, 2017

A registered person may issue Revised Invoices for eligible supplies made during the specified period after obtaining GST registration.

Time Limit for Issuing a Revised Invoice

A Revised Invoice must be issued:

Within one month from the date of issue of the GST Registration Certificate (RC).

The Revised Invoice can be issued only for supplies made between:

Effective date of registration, and
Date of issue of the Registration Certificate.

Period Covered by a Revised Invoice

Particular	Description
Starting Point	Effective date of GST registration
Ending Point	Date of issue of Registration Certificate
Time available to issue Revised Invoice	Within one month from the date of issue of the Registration Certificate

Practical Example

Example 1 – Normal Case

ABC Enterprises applies for GST registration.

Event	Date
Effective Date of Registration	1 July 2026
Registration Certificate Issued	20 July 2026

Between 1 July 2026 and 20 July 2026, ABC supplies goods worth ₹5,00,000 and issues normal commercial invoices.

After receiving the Registration Certificate on 20 July 2026, ABC may issue Revised Invoices for all taxable supplies made during this period.

These Revised Invoices should be issued within one month, i.e., on or before 19 August 2026.

Example 2 – Benefit to the Customer

XYZ Pvt. Ltd. purchases machinery from ABC Enterprises on 10 July 2026.

At that time, ABC's GST Registration Certificate has not yet been issued.

After obtaining GST registration, ABC issues a Revised Invoice mentioning GST.

XYZ Pvt. Ltd. can now claim Input Tax Credit (ITC), subject to the conditions prescribed under the GST Act.

Why is a Revised Invoice Important?

A Revised Invoice helps to:

Bring earlier supplies within the GST framework.
Enable customers to claim eligible Input Tax Credit.
Correct invoices issued before receipt of the Registration Certificate.
Ensure compliance with GST law.
Avoid disputes regarding tax documentation.

Difference Between Original Invoice and Revised Invoice

Particular	Original Invoice	Revised Invoice
Issued Before GST Registration Certificate	Yes	No
Issued After Registration Certificate	No	Yes
Contains GST Details	May not contain GST particulars	Contains prescribed GST particulars
Purpose	Commercial document	Replacement GST-compliant invoice

Important Points

A Revised Invoice can be issued only after GST registration is granted.
It applies only to supplies made between the effective date of registration and the date of issue of the Registration Certificate.
It must be issued within one month from the date of issuance of the Registration Certificate.
The Revised Invoice replaces the original invoice issued for the same transaction.
Eligible recipients may claim Input Tax Credit based on the Revised Invoice, subject to the provisions of the GST Act.

Common Mistakes to Avoid

Issuing Revised Invoices after the prescribed one-month time limit.
Issuing Revised Invoices for supplies made before the effective date of registration.
Failing to link the Revised Invoice with the original invoice.
Omitting mandatory particulars prescribed under Rule 46.
Not maintaining proper records of the original and revised invoices.

Summary Table

Particular	Provision
Applicable Section	Section 31 of the CGST Act, 2017
Eligible Person	Newly registered taxpayer
Applicable Period	Effective date of registration to the date of issue of the Registration Certificate
Time Limit	Within one month from the date of issue of the Registration Certificate
Purpose	Replace earlier invoices and facilitate GST compliance and ITC

Key Points

A Revised Invoice enables a newly registered taxpayer to regularise invoices issued before receiving the GST Registration Certificate.
It may be issued for supplies made between the effective date of registration and the date of issue of the Registration Certificate.
The Revised Invoice must be issued within one month from the date of issue of the Registration Certificate.
It helps eligible recipients claim Input Tax Credit (ITC) and ensures proper compliance with the GST law.
Businesses should maintain proper documentation linking the original invoice and the Revised Invoice to facilitate audits and future verification.

Debit Note

A Debit Note is an important document under the Goods and Services Tax (GST) regime that enables a supplier to increase the taxable value or GST amount of an invoice already issued. Business transactions may sometimes require corrections after a Tax Invoice has been issued due to undercharging of value, incorrect tax calculation, price revisions, or supply of additional goods or services.

To rectify such situations, Section 34 of the Central Goods and Services Tax (CGST) Act, 2017 permits the supplier to issue a Debit Note to the recipient.

A Debit Note increases the amount payable by the recipient and results in an increase in the supplier's output GST liability.

Legal Provision

The provisions relating to Debit Notes are contained in:

Section 34 of the CGST Act, 2017
Relevant provisions of the CGST Rules, 2017

A registered supplier may issue one or more Debit Notes against one or more Tax Invoices where the taxable value or tax charged is less than what should have been charged.

What is a Debit Note?

A Debit Note is a document issued by the supplier to the recipient when:

The taxable value shown in the original Tax Invoice is lower than the correct value.
GST charged in the original invoice is less than the applicable tax.
Additional goods or services are supplied after issuing the original invoice.
A price revision increases the consideration payable by the customer.

A Debit Note informs the recipient that an additional amount is payable.

When is a Debit Note Issued?

A Debit Note may be issued in the following situations:

1. Understatement of Taxable Value

The supplier inadvertently charges a lower value than the actual value.

Example

ABC Traders sells machinery.

Original Invoice:

Particular	Amount
Taxable Value	₹1,00,000
GST @18%	₹18,000

Later, it is discovered that the correct taxable value should have been ₹1,20,000.

ABC issues a Debit Note for:

Particular	Amount
Additional Taxable Value	₹20,000
GST @18%	₹3,600

2. Short Collection of GST

Sometimes the taxable value is correct, but GST is charged at a lower rate due to an error.

Example

Goods taxable at 18% were mistakenly invoiced at 12%.

Original Invoice:

Taxable Value	₹50,000
GST @12%	₹6,000

Correct GST:

₹9,000

Debit Note:

Additional GST = ₹3,000

3. Price Revision After Supply

The parties may agree to increase the selling price after the original invoice has been issued.

Example

A supplier sells industrial equipment for ₹5,00,000.

After negotiations, the price is revised to ₹5,50,000.

The supplier issues a Debit Note for:

Additional Value = ₹50,000
GST on ₹50,000

4. Additional Quantity Supplied

Where additional goods or services are supplied after the original invoice without issuing a fresh Tax Invoice, the supplier may issue a Debit Note for the additional value.

Example

Original Supply:

100 office chairs

Later supplied:

10 additional chairs

Instead of issuing another Tax Invoice for the correction, the supplier may issue a Debit Note for the value of the additional chairs, where appropriate.

Contents of a Debit Note

A Debit Note should generally contain:

Name, address and GSTIN of the supplier.
Consecutive serial number.
Date of issue.
Name, address and GSTIN/UIN of the recipient.
Reference to the original Tax Invoice.
Description of goods or services.
Additional taxable value.
Applicable GST rate.
Additional CGST, SGST/UTGST or IGST amount.
Signature or digital signature of the supplier or authorised representative, where applicable.

Reporting of Debit Note in GST Returns

After issuing a Debit Note:

The supplier should report the Debit Note in the relevant GST return for the tax period in which it is issued.
The additional GST liability arising from the Debit Note must be discharged in that return.

This ensures that the correct amount of tax is paid to the Government.

Practical Illustration

Original Invoice

Particular	Amount
Taxable Value	₹2,00,000
GST @18%	₹36,000
Total Invoice	₹2,36,000

After verification, the supplier finds that the correct taxable value should have been ₹2,20,000.

Debit Note

Particular	Amount
Additional Taxable Value	₹20,000
GST @18%	₹3,600
Total Debit Note	₹23,600

The customer pays the additional amount, and the supplier reports the Debit Note in the applicable GST return.

Difference Between Tax Invoice and Debit Note

Particular	Tax Invoice	Debit Note
Purpose	Records the original taxable supply	Increases the taxable value or GST of an existing invoice
Issued When	At the time of supply	After the original invoice when additional value or tax becomes payable
Effect on Tax Liability	Creates initial GST liability	Increases GST liability
Reference to Original Invoice	Not required	Mandatory

Summary Table

Situation	Debit Note Required?
Taxable value charged is less	Yes
GST charged is less	Yes
Price increases after supply	Yes
Additional quantity supplied resulting in additional consideration	Yes
Goods returned by customer	No (Credit Note is applicable)

Common Mistakes to Avoid

Issuing a Debit Note without referring to the original Tax Invoice.
Incorrect calculation of additional GST.
Failing to report the Debit Note in the appropriate GST return.
Omitting mandatory particulars prescribed under the GST Rules.
Delaying the issuance of the Debit Note, leading to reconciliation issues.

Key Points

A Debit Note is issued under Section 34 of the CGST Act, 2017 when the taxable value or GST charged in the original invoice is less than what should have been charged.
It enables the supplier to recover the additional amount payable by the recipient.
A Debit Note increases the supplier's output GST liability and should be reported in the applicable GST return.
Proper documentation and timely reporting help maintain accurate GST records and ensure compliance.
Businesses should always maintain a clear linkage between the original Tax Invoice and the corresponding Debit Note for audit and reconciliation purposes.

Credit Note

A Credit Note is an important GST document issued by a supplier to reduce the taxable value or tax charged in an earlier Tax Invoice. Business transactions may change after the original invoice is issued due to return of goods, cancellation of services, post-sale discounts, pricing errors, or excess GST being charged. In such cases, the supplier can issue a Credit Note to correct the transaction.

The provisions relating to Credit Notes are contained in Section 34 of the Central Goods and Services Tax (CGST) Act, 2017, read with the relevant provisions of the CGST Rules, 2017.

A Credit Note reduces the amount payable by the recipient and, subject to the conditions prescribed under the GST Act, enables the supplier to reduce the corresponding output GST liability.

Legal Provision

The provisions relating to Credit Notes are contained in:

Section 34 of the CGST Act, 2017
Relevant provisions of the CGST Rules, 2017

A registered supplier may issue one or more Credit Notes against one or more Tax Invoices where the taxable value or GST charged exceeds the amount actually payable or where other specified situations arise.

What is a Credit Note?

A Credit Note is a document issued by the supplier to the recipient for reducing the value of an earlier invoice.

It is generally issued when:

Excess taxable value has been charged.
Excess GST has been collected.
Goods supplied are returned.
Services are cancelled or partly not provided.
A post-sale discount is allowed in accordance with the GST provisions.
There is a reduction in the agreed contract price.

A Credit Note informs the customer that the amount payable has been reduced or that a refund/adjustment is available.

When is a Credit Note Issued?

1. Excess Taxable Value Charged

If the supplier has charged a higher taxable value than the actual value, a Credit Note should be issued.

Example

Original Invoice:

Particular	Amount
Taxable Value	₹1,50,000
GST @18%	₹27,000

After verification, the correct taxable value is found to be ₹1,30,000.

The supplier issues a Credit Note for:

Particular	Amount
Reduction in Taxable Value	₹20,000
GST @18%	₹3,600

2. Excess GST Charged

Sometimes the taxable value is correct, but GST is charged at a higher rate due to an error.

Example

A product taxable at 12% is mistakenly invoiced at 18%.

Taxable Value	₹1,00,000
GST Charged @18%	₹18,000

Correct GST:

₹12,000

Credit Note:

Reduction in GST = ₹6,000

3. Goods Returned by the Customer

Customers may return goods due to damage, defects, incorrect specifications, or cancellation of the order.

Example

ABC Electronics sells 20 laptops to XYZ Ltd.

Later, XYZ returns 5 laptops due to manufacturing defects.

ABC issues a Credit Note for:

Value of 5 laptops.
Corresponding GST.

4. Services Cancelled or Partly Provided

Where services are cancelled or only partly rendered after issuing the original invoice, the supplier may issue a Credit Note.

Example

A consultancy firm invoices a client for a one-year consultancy contract.

After six months, the contract is mutually terminated.

The consultant issues a Credit Note for the value of the unprovided services together with the related GST.

5. Post-Sale Discount

A supplier may grant a discount after issuing the Tax Invoice, provided the conditions prescribed under the GST law are satisfied.

Example

ABC Manufacturers offers a year-end turnover discount of ₹50,000 to its distributor.

A Credit Note is issued for:

Discount = ₹50,000
GST adjustment on the discount amount, where permitted.

6. Reduction in Contract Price

If the parties agree to reduce the selling price after issuing the invoice, a Credit Note may be issued.

Example

A construction company initially invoices a project for ₹10,00,000.

Later, both parties revise the contract value to ₹9,50,000.

The company issues a Credit Note for:

Reduction in Value = ₹50,000
GST adjustment on ₹50,000.

Contents of a Credit Note

A Credit Note should generally contain:

Name, address and GSTIN of the supplier.
Consecutive serial number.
Date of issue.
Name, address and GSTIN/UIN of the recipient.
Reference to the original Tax Invoice.
Description of goods or services.
Amount by which the taxable value is reduced.
Applicable GST rate.
Reduction in CGST, SGST/UTGST or IGST.
Signature or digital signature of the supplier or authorised representative, where applicable.

Reporting of Credit Note in GST Returns

After issuing a Credit Note:

The supplier should declare its details in the relevant GST return.
The reduction in output tax liability can be claimed only if the conditions prescribed under the GST Act are fulfilled.
As provided in the uploaded chapter, the Credit Note should be reported on or before 30th November of the financial year following the financial year in which the original supply was made, or the date of furnishing the Annual Return, whichever is earlier.

Practical Illustration

Original Invoice

Particular	Amount
Taxable Value	₹2,00,000
GST @18%	₹36,000
Total Invoice	₹2,36,000

Later, goods worth ₹40,000 are returned.

Credit Note

Particular	Amount
Reduction in Taxable Value	₹40,000
GST @18%	₹7,200
Total Credit Note	₹47,200

The supplier adjusts the output GST liability by reporting the Credit Note within the prescribed time limit.

Difference Between Debit Note and Credit Note

Particular	Debit Note	Credit Note
Purpose	Increases taxable value or GST	Reduces taxable value or GST
Amount Payable by Customer	Increases	Decreases
Effect on GST Liability	Increases output tax liability	Reduces output tax liability (subject to GST provisions)
Common Reasons	Undercharged value, short GST, price increase	Excess value, excess GST, goods returned, discounts

Summary Table

Situation	Credit Note Required?
Excess taxable value charged	Yes
Excess GST collected	Yes
Goods returned	Yes
Services cancelled or partly provided	Yes
Post-sale discount (subject to GST conditions)	Yes
Price reduced after supply	Yes
Additional value payable	No (Debit Note is applicable)

Common Mistakes to Avoid

Issuing a Credit Note without linking it to the original Tax Invoice.
Claiming GST adjustment after the statutory time limit.
Omitting mandatory particulars prescribed under the GST Rules.
Incorrect GST calculation while issuing the Credit Note.
Failing to report the Credit Note in the relevant GST return.

Key Points

A Credit Note is issued under Section 34 of the CGST Act, 2017 to reduce the taxable value or GST charged in an earlier invoice.
It is commonly used for goods returns, excess tax charged, excess taxable value, post-sale discounts, service cancellations, and contract price reductions.
The supplier should report the Credit Note in the GST return within the prescribed statutory time limit to claim adjustment of output tax liability.
Proper documentation and timely reporting help maintain accurate GST records and reduce the risk of disputes during audits.
Every Credit Note should clearly reference the original Tax Invoice and contain all mandatory particulars prescribed under the GST Rules.

Special Provisions for GST Invoices

While the GST law prescribes a standard format and mandatory particulars for Tax Invoices, certain industries operate under unique business models where issuing a conventional invoice is not always practical. Therefore, the CGST Act, 2017 and the CGST Rules, 2017 provide special invoicing provisions for specified sectors.

These special provisions simplify compliance without compromising transparency or tax administration.

The major sectors covered under these special provisions include:

Banking Companies
Insurance Companies
Non-Banking Financial Companies (NBFCs)
Goods Transport Agencies (GTA)
Passenger Transport Services
Cinema Halls

Banking Companies

Legal Provision

Banks are allowed certain relaxations in the format of Tax Invoices because they issue thousands of transaction documents every day.

A banking company may issue a Tax Invoice even if it does not contain:

Consecutive serial number.
Name and address of the recipient.

However, the document must contain sufficient information to identify:

Supplier
Nature of service
Value of supply
GST charged

These relaxations reduce the operational burden on banks while ensuring GST compliance.

Example

A bank charges:

Annual locker rent
Processing fees
Debit card charges

The account statement or transaction advice issued by the bank may serve as the Tax Invoice, even though it may not contain the customer's complete address or a consecutive serial number.

Insurance Companies

Insurance companies enjoy similar relaxations because they issue a large number of premium documents every day.

The invoice issued by an insurance company:

Need not contain a consecutive serial number.
Need not mention the recipient's complete address in every case.

However, it must clearly mention:

Policy holder details
Nature of insurance service
Premium amount
GST charged
Name and GSTIN of the insurer

Example

ABC Insurance Ltd. issues a motor insurance policy.

The premium receipt mentioning the GST amount serves as the Tax Invoice under GST.

Non-Banking Financial Companies (NBFCs)

NBFCs providing financial services are also covered under the same special provisions applicable to banking companies.

Because financial institutions issue numerous financial documents every day, the GST Rules permit simplified invoicing.

The invoice issued by an NBFC:

May not contain a serial number.
May omit the recipient's address where permitted.
Must contain sufficient information to establish the taxable transaction.

Example

An NBFC grants a personal loan.

The loan statement showing:

Processing fee
Documentation charges
GST charged

acts as the GST Tax Invoice.

Summary – Banking, Insurance Companies and NBFCs

Particular	Banking Company	Insurance Company	NBFC
Serial Number Mandatory	Relaxation available	Relaxation available	Relaxation available
Recipient Address Mandatory	Relaxation available	Relaxation available	Relaxation available
GST Details Required	Yes	Yes	Yes
Supplier GSTIN Required	Yes	Yes	Yes

Goods Transport Agency (GTA)

A Goods Transport Agency (GTA) providing transportation of goods by road must issue a Tax Invoice containing prescribed particulars.

Apart from the normal invoice particulars, the invoice generally includes:

Gross weight of goods.
Name of the consignor.
Name of the consignee.
Vehicle registration number (where applicable).
Origin of transportation.
Destination of transportation.
GSTIN of the taxable person, wherever applicable.
Description of goods transported.

These additional particulars help establish the identity of the consignment during transportation and facilitate GST compliance.

Example

XYZ Logistics transports goods from Kolkata to Ranchi.

The Tax Invoice includes:

Gross Weight: 2,500 kg
Vehicle No.: WB12AB1234
Origin: Kolkata
Destination: Ranchi
Consignor and Consignee Details

Passenger Transport Services

For passenger transportation services, GST law provides a simplified compliance mechanism.

The ticket issued to the passenger is treated as the Tax Invoice, provided it contains the prescribed particulars.

There is generally no requirement to issue a separate Tax Invoice.

Examples

Airline ticket
Railway ticket (where GST is applicable)
Bus ticket
Metro ticket (where applicable)

Example

A passenger books an airline ticket.

The e-ticket issued by the airline mentioning:

Passenger name
Journey details
Fare
GST

acts as the GST Tax Invoice.

Cinema Tickets

For admission to cinema halls or multiplexes, the GST Rules provide that the cinema ticket itself is treated as the Tax Invoice.

No separate invoice is required.

The ticket generally contains:

Name of the cinema.
Movie details.
Show timing.
Ticket value.
GST, wherever applicable.

Example

A customer purchases a movie ticket for ₹300.

The printed or electronic ticket issued by the cinema serves as the GST Tax Invoice.

Practical Illustration

Business Type	GST Document Issued
Bank	Account statement/transaction advice as Tax Invoice (subject to prescribed relaxations)
Insurance Company	Insurance premium receipt/policy document
NBFC	Loan statement or fee statement
Goods Transport Agency	GTA Tax Invoice containing transportation particulars
Passenger Transport	Passenger ticket
Cinema Hall	Cinema ticket

Summary Table – Special Provisions

Sector	Special Provision
Banking Company	Relaxation from consecutive serial number and recipient's address in prescribed cases
Insurance Company	Similar relaxation as banking companies
NBFC	Similar relaxation as banking companies
Goods Transport Agency (GTA)	Invoice to contain transportation-specific particulars such as gross weight, vehicle number, origin and destination
Passenger Transport	Passenger ticket is treated as the Tax Invoice
Cinema Hall	Cinema ticket is treated as the Tax Invoice

Why These Special Provisions Exist

The Government introduced these relaxations to:

Reduce compliance burden for high-volume industries.
Simplify invoice generation.
Ensure practical implementation of GST.
Maintain transparency while avoiding unnecessary documentation.
Facilitate easier verification during audits and inspections.

Key Points

Certain industries have special invoicing provisions under the GST law due to the nature of their business operations.
Banking companies, insurance companies, and NBFCs enjoy specified relaxations regarding invoice particulars, such as the serial number and recipient's address, while still being required to include essential GST information.
Goods Transport Agencies (GTAs) must include additional transport-related details in their invoices, including gross weight, vehicle registration number, origin, and destination.
For passenger transport services, the ticket itself is treated as the Tax Invoice.
For cinema halls, the cinema ticket serves as the Tax Invoice, eliminating the need for a separate invoice.
These special provisions simplify GST compliance while ensuring that the necessary information is available for tax administration and audit purposes.

E-Invoicing under Rule 48

The introduction of E-Invoicing is one of the most significant digital reforms under the Goods and Services Tax (GST) regime. It was introduced to standardize invoice reporting, reduce tax evasion, eliminate fake invoices, automate GST compliance, and improve the overall efficiency of the tax system.

Contrary to popular belief, E-Invoicing does not mean generating an invoice on a computer or in PDF format. Instead, it is a system where specified taxpayers generate an invoice in their own accounting or ERP software and upload the invoice details to the Invoice Registration Portal (IRP). The IRP validates the invoice, generates a unique Invoice Reference Number (IRN), digitally signs the invoice, and creates a QR Code before the invoice becomes a valid e-invoice.

The provisions relating to E-Invoicing are contained in Rule 48(4) of the Central Goods and Services Tax (CGST) Rules, 2017, read with the notifications issued by the Central Government from time to time.

What is E-Invoicing?

An E-Invoice is a GST Tax Invoice that is electronically authenticated by the Government's Invoice Registration Portal (IRP).

The supplier prepares the invoice in the prescribed format and uploads its details to the IRP. After successful validation, the portal:

Generates an Invoice Reference Number (IRN).
Digitally signs the invoice.
Generates a QR Code.
Shares the invoice data with the GST system.
Transmits relevant information for E-Way Bill generation, wherever applicable.

Only after successful registration on the IRP does the invoice become a valid e-invoice under Rule 48(4).

Legal Provision

The provisions relating to E-Invoicing are contained in:

Rule 48(4) of the CGST Rules, 2017
Relevant notifications issued under the CGST Act.

Rule 48 authorises the Government to notify classes of registered persons who must generate invoices through the Invoice Registration Portal.

Applicability of E-Invoicing

As per the uploaded chapter, E-Invoicing applies to:

Registered persons whose aggregate turnover exceeds ₹5 crore in any preceding financial year from 2017-18 onwards.
Supplies made to registered persons (B2B supplies).
Exports.

The invoice must be prepared in the prescribed format and reported to the Invoice Registration Portal for obtaining an Invoice Reference Number (IRN).

Note: The Government may revise the turnover threshold through subsequent notifications. Businesses should always verify the latest applicability before implementing e-invoicing.

Supplies Covered

E-Invoicing generally applies to:

Business-to-Business (B2B) supplies.
Export supplies.
Debit Notes.
Credit Notes (where applicable under the notified provisions).

Information Required in an E-Invoice

The invoice prepared by the supplier should include all mandatory particulars prescribed under the GST Rules, including:

Supplier details.
Recipient details.
GSTIN.
Invoice number.
Invoice date.
HSN/SAC Code.
Description of goods or services.
Taxable value.
GST rate.
Tax amount.
Place of Supply.
Other prescribed particulars.

The invoice is prepared in the prescribed electronic format before being uploaded to the IRP.

Invoice Reference Number (IRN)

The Invoice Reference Number (IRN) is a unique identification number generated by the Invoice Registration Portal after validating the invoice details.

The IRN uniquely identifies every registered e-invoice and prevents duplication.

It forms an integral part of every valid e-invoice generated under Rule 48(4).

QR Code in E-Invoice

After successful registration, the IRP generates a digitally signed QR Code.

The QR Code generally contains important information such as:

Supplier GSTIN.
Recipient GSTIN.
Invoice Number.
Invoice Date.
Invoice Value.
Number of line items.
HSN Code (where applicable).
IRN.
Digital signature.

The QR Code enables tax officers and other stakeholders to verify the authenticity of the invoice instantly.

Workflow of E-Invoicing

The e-invoicing process generally follows these steps:

Step 1 – Invoice Creation

The supplier prepares the invoice using ERP or accounting software in the prescribed electronic format.

↓

Step 2 – Upload to Invoice Registration Portal (IRP)

Invoice data is uploaded to the Government's Invoice Registration Portal.

↓

Step 3 – Validation

The IRP validates:

GSTIN.
Invoice Number.
Invoice Date.
Other mandatory particulars.

↓

Step 4 – Generation of IRN

A unique Invoice Reference Number (IRN) is generated.

↓

Step 5 – Digital Signature and QR Code

The portal digitally signs the invoice and generates a QR Code.

↓

Step 6 – Data Transmission

The authenticated invoice data is transmitted to:

GST Portal for return reporting.
E-Way Bill System (where applicable).

↓

Step 7 – Final E-Invoice

The supplier issues the authenticated invoice to the customer.

Benefits of E-Invoicing

E-Invoicing offers several advantages to businesses and the Government.

1. Reduction in Tax Evasion

Authentication through the IRP significantly reduces fake invoices and fraudulent Input Tax Credit claims.

2. Automated GST Return Preparation

Invoice details are automatically shared with the GST system, reducing manual data entry.

3. Faster E-Way Bill Generation

Relevant invoice data is transmitted to the E-Way Bill portal, simplifying the generation process.

4. Better Accuracy

Validation by the IRP minimizes invoice errors and duplication.

5. Improved Compliance

Standardised invoice reporting improves overall GST compliance.

6. Paperless Environment

Digital authentication reduces dependence on physical documentation.

7. Easier Verification

The QR Code enables quick verification by GST officers and business recipients.

Entities Exempt from Mandatory E-Invoicing

As highlighted in the uploaded chapter, certain entities are exempt from mandatory e-invoicing, including:

Insurance companies.
Banking companies.
Financial institutions, including NBFCs.
Goods Transport Agencies (GTAs).
Passenger transport service providers.
Cinema halls.
OIDAR service providers.
Government departments and local authorities notified for exemption.
Special Economic Zone (SEZ) units, where specifically exempt under the applicable notification.

The uploaded material also clarifies that where an entity is exempt, the exemption generally applies to the entity as a whole, rather than only to specific supplies made by that entity.

Practical Example

ABC Manufacturing Pvt. Ltd. has an aggregate turnover exceeding the prescribed threshold.

The company supplies machinery worth ₹10,00,000 to XYZ Industries.

The process is as follows:

ABC prepares the invoice in its ERP system.
Invoice details are uploaded to the IRP.
The IRP validates the invoice.
An IRN is generated.
A digitally signed QR Code is created.
The authenticated invoice is issued to XYZ Industries.
Invoice details are transmitted to the GST Portal and the E-Way Bill system.

Summary Table

Particular	Details
Governing Provision	Rule 48(4) of the CGST Rules, 2017
Purpose	Electronic authentication of GST invoices
Applicable to	Notified registered persons crossing the prescribed turnover threshold
Portal Used	Invoice Registration Portal (IRP)
Unique Identification	Invoice Reference Number (IRN)
Authentication	Digital Signature and QR Code
Major Benefits	Standardisation, automation, reduced tax evasion, easier compliance

Key Points

Rule 48(4) provides the legal framework for the generation of E-Invoices by notified registered persons.
An E-Invoice becomes valid only after authentication by the Invoice Registration Portal (IRP), which generates the Invoice Reference Number (IRN) and a digitally signed QR Code.
E-Invoicing improves GST compliance by standardising invoice reporting, reducing fake invoicing, automating GST return preparation, and facilitating E-Way Bill generation.
Certain entities, including banking companies, insurance companies, NBFCs, Goods Transport Agencies (GTAs), passenger transport service providers, and cinema halls, enjoy exemptions from mandatory e-invoicing as specified in the applicable notifications.
Businesses should always verify the latest Government notifications for the current turnover threshold and applicability before implementing e-invoicing.

Invoice Reference Number (IRN)

The Invoice Reference Number (IRN) is the heart of the GST E-Invoicing System. Every e-invoice generated under Rule 48(4) of the CGST Rules, 2017 receives a unique Invoice Reference Number after it is successfully authenticated by the Invoice Registration Portal (IRP).

The IRN serves as a unique identification number for every registered e-invoice and confirms that the invoice has been validated by the Government's e-invoicing system. It plays a vital role in preventing duplicate invoices, reducing tax evasion, and ensuring seamless integration with GST returns and the E-Way Bill system.

Legal Provision

The concept of the Invoice Reference Number (IRN) is prescribed under:

Rule 48(4) of the CGST Rules, 2017
Relevant notifications issued under the GST Act.

Under these provisions, notified registered persons are required to upload invoice details to the Invoice Registration Portal (IRP), which generates the IRN after successful validation.

What is an Invoice Reference Number (IRN)?

An Invoice Reference Number (IRN) is a unique 64-character hash generated by the Invoice Registration Portal for every valid e-invoice.

The uploaded chapter describes it as a 64-digit code generated after the invoice is uploaded and validated by the portal.

The IRN acts as:

A unique identity for the invoice.
Proof that the invoice has been authenticated by the IRP.
Protection against duplicate invoice generation.
A key reference for GST compliance and verification.

Why is the IRN Important?

The Invoice Reference Number is important because it:

Authenticates the GST invoice.
Prevents duplicate invoice reporting.
Enables automatic reporting in GST returns.
Facilitates E-Way Bill generation.
Simplifies verification by GST authorities.
Reduces fake invoicing and fraudulent Input Tax Credit (ITC) claims.

Without a valid IRN, an invoice that is required to be reported under the e-invoicing system is not regarded as a valid e-invoice.

How is an IRN Generated?

The IRN is generated automatically by the Invoice Registration Portal (IRP) after validating the invoice uploaded by the supplier.

Step 1 – Create Invoice

The supplier prepares the GST invoice in the prescribed electronic format using ERP or accounting software.

↓

Step 2 – Upload to IRP

Invoice details are uploaded to the Invoice Registration Portal.

↓

Step 3 – Validation

The IRP validates important information such as:

Supplier GSTIN.
Invoice Number.
Financial Year.
Invoice Date.
Other prescribed particulars.

↓

Step 4 – IRN Generation

After successful validation, the IRP generates a unique IRN.

↓

Step 5 – Digital Authentication

The IRP:

Digitally signs the invoice.
Generates a QR Code.
Returns the authenticated invoice to the supplier.

↓

Step 6 – Data Sharing

The validated invoice information is transmitted to:

GST Portal.
E-Way Bill System (where applicable).

Information Associated with the IRN

The authenticated e-invoice linked with the IRN generally contains:

Supplier GSTIN.
Recipient GSTIN.
Invoice Number.
Invoice Date.
Invoice Value.
Taxable Value.
GST Amount.
HSN/SAC Codes.
QR Code.
Digital Signature.
Invoice Reference Number (IRN).

Practical Example

ABC Manufacturing Pvt. Ltd. supplies machinery worth ₹8,00,000 to XYZ Industries.

The company:

Generates the invoice in its ERP software.
Uploads the invoice details to the IRP.
The IRP validates the information.
A unique Invoice Reference Number (IRN) is generated.
A digitally signed QR Code is created.
The authenticated invoice is returned to ABC Manufacturing and shared with the GST system.

XYZ Industries receives the e-invoice containing the IRN and can use it for GST compliance and eligible Input Tax Credit.

Benefits of Invoice Reference Number (IRN)

1. Unique Identification

Every e-invoice receives a unique identity, eliminating duplication.

2. Authenticity

The IRN confirms that the invoice has been validated by the Government's Invoice Registration Portal.

3. Automated GST Compliance

Invoice details are automatically shared with the GST Portal, reducing manual reporting.

4. Faster E-Way Bill Generation

The validated invoice data can be used to generate E-Way Bills more efficiently.

5. Prevention of Fraud

IRN-based validation significantly reduces fake invoices and fraudulent ITC claims.

6. Easier Audit and Verification

GST officers can verify the authenticity of an invoice using the IRN and the associated QR Code.

Difference Between Invoice Number and IRN

Particular	Invoice Number	Invoice Reference Number (IRN)
Generated By	Supplier	Invoice Registration Portal (IRP)
Purpose	Internal invoice identification	Government authentication of the e-invoice
Uniqueness	Unique within the supplier's records	Unique across the e-invoicing system
Applicable To	All invoices	E-Invoices covered under Rule 48(4)
Changes Allowed	As permitted before issuance	Generated after successful validation by the IRP

Summary Table

Particular	Details
Governing Provision	Rule 48(4) of the CGST Rules, 2017
Generated By	Invoice Registration Portal (IRP)
Nature	Unique 64-character reference generated after invoice validation
Purpose	Authenticate e-invoices and prevent duplication
Linked With	QR Code and digitally signed e-invoice
Benefits	Automation, verification, fraud prevention, GST compliance

Common Mistakes to Avoid

Treating the supplier's invoice number as the IRN.
Issuing an e-invoice without obtaining the IRN where e-invoicing is mandatory.
Uploading incorrect invoice details to the IRP, leading to validation errors.
Assuming that generating a PDF invoice is the same as generating an e-invoice.
Failing to retain the authenticated invoice containing the IRN and QR Code.

Key Points

The Invoice Reference Number (IRN) is the unique identifier assigned to an e-invoice after validation by the Invoice Registration Portal (IRP).
It is generated only for invoices covered under Rule 48(4) of the CGST Rules, 2017.
The IRN authenticates the invoice, prevents duplication, facilitates GST return reporting, and supports E-Way Bill generation.
A valid e-invoice consists of the supplier's invoice together with the IRN, digitally signed QR Code, and other prescribed particulars.
Businesses required to comply with e-invoicing should ensure that every applicable invoice is successfully registered with the IRP before issuing it to the recipient.

QR Code in GST Invoice

A QR (Quick Response) Code is an important feature of the GST E-Invoicing system. It enables instant verification of the authenticity of an invoice by tax authorities, buyers, transporters, and other stakeholders.

Under the GST E-Invoicing framework, once an invoice is uploaded to the Invoice Registration Portal (IRP) and successfully validated, the portal digitally signs the invoice and generates a QR Code containing essential invoice information. This QR Code forms an integral part of a valid e-invoice issued under Rule 48(4) of the CGST Rules, 2017.

The QR Code eliminates the need for manual verification of invoice details and supports a paperless, transparent, and efficient tax administration system.

Legal Provision

The provisions relating to the QR Code are contained in:

Rule 48(4) of the CGST Rules, 2017 (for E-Invoices)
Relevant Government notifications issued from time to time.

The QR Code is automatically generated by the Invoice Registration Portal (IRP) after successful validation of the invoice.

What is a QR Code in GST?

A QR Code (Quick Response Code) is a two-dimensional machine-readable barcode generated by the IRP after an invoice is successfully authenticated.

It stores important invoice information in an encrypted format, enabling instant verification using a QR Code scanner or the prescribed Government application.

Unlike a normal barcode, a QR Code can store significantly more information and can be scanned from any direction.

How is the QR Code Generated?

The QR Code is generated automatically during the e-invoicing process.

Step 1 – Invoice Creation

The supplier prepares the invoice using ERP or accounting software.

↓

Step 2 – Upload to IRP

Invoice details are uploaded to the Invoice Registration Portal.

↓

Step 3 – Validation

The IRP validates the invoice particulars.

↓

Step 4 – IRN Generation

A unique Invoice Reference Number (IRN) is generated.

↓

Step 5 – QR Code Generation

The IRP digitally signs the invoice and creates a QR Code.

↓

Step 6 – Authenticated Invoice

The digitally signed invoice with the QR Code is returned to the supplier.

Information Contained in the QR Code

As highlighted in the uploaded chapter, the QR Code generally contains important information relating to the invoice, including:

Supplier's GSTIN.
Recipient's GSTIN.
Invoice Number.
Invoice Date.
Invoice Value.
Invoice Reference Number (IRN).
Digital Signature.
Supply-related details necessary for verification.

The encoded information allows quick verification without manually checking each invoice field.

Purpose of the QR Code

The QR Code serves several important purposes:

Confirms that the invoice has been authenticated by the IRP.
Enables instant verification of invoice authenticity.
Prevents fake and duplicate invoices.
Facilitates verification during inspection and audit.
Supports paperless GST compliance.
Improves transparency and efficiency.

Verification of QR Code

GST officers can scan the QR Code using the prescribed verification application.

After scanning, the application displays the essential invoice information stored in the QR Code, allowing officers to verify that the invoice is genuine and registered with the GST system.

The uploaded chapter specifically notes that officers can verify invoices using the QR Code scanner provided for this purpose.

Physical Copy of Invoice

The uploaded chapter clarifies that where an invoice has been generated under the e-invoicing system, there is generally no requirement to carry a physical copy of the Tax Invoice during the movement of goods, provided the electronically available QR Code containing the embedded IRN can be produced for verification by the proper officer.

This significantly reduces paperwork and promotes digital compliance.

Practical Example

ABC Manufacturing Pvt. Ltd. supplies machinery worth ₹15,00,000 to XYZ Industries.

The company:

Generates the invoice in its ERP software.
Uploads the invoice to the IRP.
Receives:

Invoice Reference Number (IRN)
Digitally signed invoice
QR Code

Sends the authenticated invoice to XYZ Industries.

During transportation, the proper officer scans the QR Code and instantly verifies the invoice details.

Benefits of QR Code in GST Invoice

1. Instant Verification

Invoice details can be verified within seconds.

2. Prevention of Fake Invoices

Only invoices authenticated by the IRP contain a valid QR Code.

3. Faster GST Inspection

Tax officers can verify invoices electronically without manual scrutiny.

4. Paperless Compliance

Electronic verification reduces the need to carry physical documents in applicable cases.

5. Improved Accuracy

The QR Code contains system-generated information, minimizing the possibility of manual errors.

6. Seamless Integration

The QR Code works alongside the IRN, GST Portal, and E-Way Bill system to improve overall compliance.

Difference Between IRN and QR Code

Particular	Invoice Reference Number (IRN)	QR Code
Nature	Unique reference number generated by the IRP	Machine-readable code generated by the IRP
Purpose	Identifies and authenticates the e-invoice	Enables instant electronic verification of the invoice
Format	Unique alphanumeric/hash reference	Two-dimensional barcode
Generated By	Invoice Registration Portal (IRP)	Invoice Registration Portal (IRP)
Verification	Used as the unique reference	Scanned to retrieve invoice information

Summary Table

Particular	Details
Governing Provision	Rule 48(4) of the CGST Rules, 2017
Generated By	Invoice Registration Portal (IRP)
Purpose	Electronic verification of GST invoices
Generated Along With	Invoice Reference Number (IRN)
Contains	Supplier details, recipient details, invoice details, IRN, digital signature and other prescribed information
Major Benefit	Faster verification, reduced fraud and paperless compliance

Common Mistakes to Avoid

Confusing a normal barcode with the GST e-invoice QR Code.
Assuming that manually creating a QR Code is sufficient for e-invoicing.
Issuing an e-invoice without obtaining IRN and the system-generated QR Code where mandatory.
Altering invoice details after the QR Code has been generated.
Assuming that the QR Code replaces the Tax Invoice; it is an integral part of the authenticated e-invoice, not a substitute.

Key Points

The QR Code is automatically generated by the Invoice Registration Portal (IRP) after successful validation of an e-invoice under Rule 48(4).
It contains essential invoice information, including the Invoice Reference Number (IRN) and other prescribed particulars required for verification.
GST officers can scan the QR Code to instantly verify the authenticity of the invoice.
For invoices generated under the e-invoicing system, the QR Code facilitates digital verification and supports paperless compliance.
The QR Code, together with the IRN and digitally authenticated invoice, strengthens transparency, reduces tax evasion, and simplifies GST compliance.

Dynamic QR Code for B2C Invoices

The Dynamic QR Code is another important digital initiative introduced under the GST regime to promote digital payments and improve transparency in Business-to-Consumer (B2C) transactions.

Unlike the QR Code generated under the E-Invoicing System, a Dynamic QR Code is primarily intended to facilitate instant digital payment by customers. By scanning the QR Code, the customer can directly make payment using UPI or other supported digital payment methods.

The provisions relating to Dynamic QR Codes are contained in Rule 46 of the Central Goods and Services Tax (CGST) Rules, 2017, read with the relevant Government notifications.

What is a Dynamic QR Code?

A Dynamic QR Code is a machine-readable code printed on a B2C invoice that enables customers to make digital payments instantly.

Unlike a Static QR Code, a Dynamic QR Code changes based on each individual transaction and generally contains transaction-specific payment details such as:

Supplier details
Invoice number
Invoice amount
Payment reference
Other prescribed payment information

Once scanned, the customer can complete payment through:

UPI
Mobile Banking
Internet Banking
Digital Wallets
Other supported payment platforms

Legal Provision

The provisions relating to Dynamic QR Code are contained in:

Rule 46 of the CGST Rules, 2017
Notification No. 71/2020 – Central Tax
Other notifications issued from time to time.

These provisions prescribe the requirement for Dynamic QR Codes on specified B2C invoices.

Applicability of Dynamic QR Code

As explained in the uploaded chapter, Dynamic QR Code is applicable to:

Registered persons whose aggregate turnover exceeds ₹500 crore in any preceding financial year from 2017-18 onwards.
Business-to-Consumer (B2C) supplies, i.e., supplies made to unregistered persons.

The purpose is to encourage digital payment collection directly from customers.

Note: The applicability should always be verified with the latest CBIC notifications, as the Government may amend the threshold or conditions from time to time.

Purpose of Dynamic QR Code

The Dynamic QR Code has been introduced to:

Promote cashless transactions.
Encourage digital payments.
Improve payment efficiency.
Reduce manual payment errors.
Increase transparency in B2C transactions.
Simplify reconciliation between invoices and payments.

Information Generally Contained in Dynamic QR Code

A Dynamic QR Code generally contains:

Supplier name.
GSTIN.
Invoice number.
Invoice date.
Invoice amount.
Payment amount.
UPI ID or payment reference.
Bank account or payment destination.
Transaction reference.

The exact information is governed by the applicable GST notifications and payment standards.

How Does a Dynamic QR Code Work?

Step 1 – Invoice Generation

The supplier prepares a B2C invoice.

↓

Step 2 – Dynamic QR Code Generation

A transaction-specific QR Code is generated containing the payment details.

↓

Step 3 – Customer Scans the QR Code

The customer scans the QR Code using a payment application.

↓

Step 4 – Payment Page Opens

The payment application automatically displays:

Merchant details
Invoice amount
Payment reference

↓

Step 5 – Customer Makes Payment

The customer completes payment using:

UPI
Mobile Banking
Digital Wallet
Other supported payment methods.

↓

Step 6 – Payment Confirmation

The payment is instantly linked with the invoice.

QR Code Through Digital Display

The uploaded chapter also clarifies that where the supplier makes the Dynamic QR Code available to the recipient through a digital display, and the invoice contains a cross-reference to the payment made using that Dynamic QR Code, such invoice is deemed to comply with the Dynamic QR Code requirement.

This provision is particularly useful for businesses that collect payments through digital screens, self-service kiosks, or electronic payment terminals.

Entities Exempt from Dynamic QR Code Requirement

According to the uploaded chapter, the following entities are exempt from the Dynamic QR Code requirement:

Insurance companies.
Banking companies.
Financial institutions, including NBFCs.
Goods Transport Agencies (GTAs).
Passenger transport service providers.
Cinema halls.
OIDAR service providers.

These exemptions are available because of the special nature of their business operations.

Practical Example

ABC Retail Pvt. Ltd. has an aggregate turnover exceeding the prescribed threshold and sells a refrigerator worth ₹35,000 to an individual customer.

The B2C invoice contains a Dynamic QR Code.

The customer:

Opens a UPI application.
Scans the QR Code.
The payment amount of ₹35,000 is automatically displayed.
The customer authorises the payment.
Payment is instantly credited to ABC Retail Pvt. Ltd.

No manual entry of bank details or invoice amount is required.

Difference Between E-Invoice QR Code and Dynamic QR Code

Particular	E-Invoice QR Code	Dynamic QR Code
Governing Provision	Rule 48(4)	Rule 46
Purpose	Authenticate an e-invoice	Facilitate digital payment
Applicable To	Specified B2B invoices and exports	Specified B2C invoices
Generated By	Invoice Registration Portal (IRP)	Supplier or authorised payment system
Contains	IRN and invoice authentication details	Payment-related transaction details
Objective	GST compliance and verification	Cashless payment collection

Summary Table

Particular	Details
Governing Rule	Rule 46 of the CGST Rules, 2017
Applicable To	Specified B2C invoices
Turnover Threshold (as per uploaded chapter)	Above ₹500 crore
Main Purpose	Enable instant digital payment
Payment Modes	UPI, Mobile Banking, Internet Banking, Digital Wallets and other supported methods
Major Benefit	Faster payment, improved reconciliation and digital compliance

Common Mistakes to Avoid

Confusing the Dynamic QR Code with the IRP-generated QR Code used for e-invoicing.
Assuming that every GST invoice requires a Dynamic QR Code.
Printing an incorrect or non-functional payment QR Code.
Not linking the QR Code to the corresponding invoice amount.
Ignoring the exemption categories prescribed under the GST notifications.

Key Points

A Dynamic QR Code is designed to facilitate digital payment for specified B2C invoices.
It is governed by Rule 46 of the CGST Rules, 2017 and the relevant Government notifications.
As per the uploaded chapter, it applies to notified registered persons with an aggregate turnover exceeding ₹500 crore issuing B2C invoices.
Unlike the e-invoice QR Code, which is generated by the Invoice Registration Portal (IRP) for invoice authentication, the Dynamic QR Code is primarily intended to simplify and accelerate digital payment collection.
Businesses covered by the requirement should ensure that their Dynamic QR Code is functional, correctly linked to the invoice, and complies with the latest CBIC notifications.

Difference between Tax Invoice, Bill of Supply, Debit Note & Credit Note

Under the GST regime, businesses issue different documents depending on the nature of the transaction. The most commonly used documents are the Tax Invoice, Bill of Supply, Debit Note, and Credit Note. Although all these documents relate to the supply of goods or services, each serves a distinct legal and accounting purpose.

Understanding the differences between these documents is essential for maintaining proper GST compliance, accurate accounting records, and seamless Input Tax Credit (ITC) reconciliation.

What is a Tax Invoice?

A Tax Invoice is issued by a registered person making taxable supplies of goods or services. It is the primary document used to charge GST and enables the recipient to claim eligible Input Tax Credit (ITC).

Purpose

Records taxable supply.
Collects GST from the customer.
Enables ITC.
Forms the basis for GST return filing.

Example

ABC Electronics sells a laptop worth ₹50,000 plus GST.

A Tax Invoice is issued showing:

Taxable Value
GST Rate
CGST/SGST or IGST
Total Invoice Value

What is a Bill of Supply?

A Bill of Supply is issued when GST is not charged on the transaction.

It is issued by:

Composition taxpayers.
Registered persons making exempt supplies.

Since no GST is collected, the Bill of Supply does not contain tax details.

Example

A composition dealer sells grocery items worth ₹8,000.

Instead of issuing a Tax Invoice, the dealer issues a Bill of Supply.

What is a Debit Note?

A Debit Note is issued after a Tax Invoice when the supplier needs to increase:

Taxable value, or
GST amount.

This usually happens due to:

Underbilling.
Price increase.
Short collection of GST.
Additional quantity supplied.

Example

Original Invoice:

Taxable Value = ₹1,00,000

Later found correct value = ₹1,20,000

Supplier issues a Debit Note for:

Additional Value = ₹20,000
GST on ₹20,000

What is a Credit Note?

A Credit Note is issued after a Tax Invoice when the supplier needs to reduce:

Taxable value, or
GST amount.

It is commonly issued because of:

Goods returned.
Excess GST charged.
Excess taxable value.
Price reduction.
Post-sale discount.
Cancellation of services.

Example

ABC Traders sells machinery worth ₹2,00,000.

Customer later returns goods worth ₹40,000.

ABC issues a Credit Note reducing both the taxable value and the GST.

Detailed Comparison

Basis of Comparison	Tax Invoice	Bill of Supply	Debit Note	Credit Note
Legal Provision	Section 31	Section 31(3)(c)	Section 34	Section 34
Purpose	Record taxable supply and collect GST	Record exempt or composition supplies	Increase taxable value or GST	Reduce taxable value or GST
When Issued	At the time of taxable supply	At the time of exempt or composition supply	After issuing the Tax Invoice when additional amount becomes payable	After issuing the Tax Invoice when the invoice value or tax needs to be reduced
Issued By	Registered supplier making taxable supplies	Composition taxpayer or supplier of exempt supplies	Registered supplier	Registered supplier
GST Charged	Yes	No	Additional GST, where applicable	Reduction of GST, where applicable
Input Tax Credit (ITC)	Available to the recipient, subject to conditions	Not available	Additional ITC may be available to the recipient, subject to conditions	Recipient may need to reverse ITC where required under GST law
Effect on Tax Liability	Creates initial GST liability	No GST liability on the transaction	Increases output GST liability	Reduces output GST liability, subject to statutory conditions
Reference to Original Invoice	Not applicable	Not applicable	Mandatory	Mandatory
Common Situations	Normal sale of taxable goods or services	Exempt supplies, Composition Scheme	Price revision upward, underbilling, short GST, additional quantity supplied	Goods returned, excess GST, excess billing, post-sale discount, cancellation of services

Practical Illustration

Scenario 1 – Tax Invoice

ABC Electronics sells a television.

Taxable Value	₹40,000
GST @18%	₹7,200
Total Invoice	₹47,200

A Tax Invoice is issued.

Scenario 2 – Bill of Supply

XYZ Medical Clinic provides exempt healthcare services worth ₹5,000.

A Bill of Supply is issued because GST is not applicable.

Scenario 3 – Debit Note

Original Invoice:

Taxable Value = ₹80,000

Correct Value = ₹90,000

Supplier issues a Debit Note for:

Additional Value = ₹10,000
Additional GST

Scenario 4 – Credit Note

Customer returns goods worth ₹15,000.

Supplier issues a Credit Note reducing:

Taxable Value = ₹15,000
GST on ₹15,000

Quick Comparison Table

Document	GST Charged	Increases Tax Liability	Reduces Tax Liability	Used for Original Supply
Tax Invoice	Yes	Yes	No	Yes
Bill of Supply	No	No	No	Yes (Exempt/Composition)
Debit Note	Yes	Yes	No	No
Credit Note	Adjustment of GST	No	Yes	No

Importance of Understanding the Difference

Choosing the correct GST document helps businesses:

Comply with the CGST Act and Rules.
Avoid penalties and notices.
Maintain accurate books of account.
Report transactions correctly in GST returns.
Enable proper Input Tax Credit reconciliation.
Reduce disputes with customers and tax authorities.

Key Points

A Tax Invoice is issued for taxable supplies and enables the collection of GST and the recipient's claim of eligible ITC.
A Bill of Supply is issued for exempt supplies or by Composition Scheme taxpayers, and no GST is charged separately.
A Debit Note is used to increase the taxable value or GST after the original invoice has been issued.
A Credit Note is used to reduce the taxable value or GST due to goods returned, excess billing, discounts, or other permissible adjustments.
Understanding the distinction between these documents is essential for accurate GST compliance, accounting, return filing, and audit readiness.

Practical GST Invoice Format

A GST Tax Invoice is the primary document issued by a registered supplier for the supply of taxable goods or services. It contains all the mandatory particulars prescribed under Section 31 of the CGST Act, 2017 and Rule 46 of the CGST Rules, 2017.

Below is a practical GST invoice format that businesses can use for day-to-day transactions.

Sample GST Tax Invoice

ABC ELECTRONICS PRIVATE LIMITED

GSTIN: 19ABCDE1234F1Z5

PAN: ABCDE1234F

Address: 45 Park Street, Kolkata – 700016, West Bengal

Phone: +91-9876543210

Email: accounts@abcelectronics.in

TAX INVOICE

Particular	Details
Invoice No.	INV/2026-27/00125
Invoice Date	15 July 2026
Place of Supply	Jharkhand (State Code: 20)
Reverse Charge	No

Bill To

XYZ Industries Private Limited

GSTIN: 20XYZAB5678K1Z3

Address:

Industrial Area,

Ranchi – 834001

Jharkhand

Ship To

XYZ Industries Warehouse

Adityapur Industrial Area

Jamshedpur – 832109

Jharkhand

Invoice Details

Sl. No.	Description of Goods	HSN Code	Qty	Unit	Rate (₹)	Taxable Value (₹)
1	Dell Inspiron Laptop	8471	10	Nos.	50,000	5,00,000

Tax Calculation

Example – Inter-State Supply

Particular	Amount (₹)
Taxable Value	5,00,000
IGST @18%	90,000
Total Invoice Value	5,90,000

Example – Intra-State Supply

Particular	Amount (₹)
Taxable Value	5,00,000
CGST @9%	45,000
SGST @9%	45,000
Total Invoice Value	5,90,000

(Only one of the above tax calculations—IGST or CGST + SGST—will apply depending on the nature of the supply.)

Amount in Words

Rupees Five Lakh Ninety Thousand Only

Declaration

We declare that this invoice shows the actual price of the goods/services described herein and that all particulars are true and correct.

Bank Details

Bank Name: State Bank of India

A/c No.: 12345678901

IFSC: SBIN0001234

Branch: Park Street, Kolkata

Authorized Signatory

For ABC Electronics Private Limited

(Signature)

Authorised Signatory

Mandatory Particulars Included

· Supplier's Name, Address & GSTIN

· Consecutive Invoice Number

· Invoice Date

· Recipient's Name & GSTIN

· Billing & Shipping Address

· Place of Suppl

· HSN Code

· Description of Goods

· Quantity & Unit

· Rate

· Taxable Value

· CGST/SGST/IGST Rate & Amount

· Total Invoice Value

· Reverse Charge Declaration

· Authorized Signatory

Practical Example

ABC Electronics Pvt. Ltd. sells 10 laptops to XYZ Industries located in another State.

Particular	Amount (₹)
Taxable Value	5,00,000
IGST @18%	90,000
Total Invoice Amount	5,90,000

ABC Electronics issues the above Tax Invoice. Since the transaction is an inter-State supply, IGST is charged. XYZ Industries can claim Input Tax Credit (ITC) of ₹90,000, subject to the provisions of the GST Act.

Common Mistakes to Avoid While Preparing a GST Invoice

Issuing invoices without a unique serial number.
Mentioning an incorrect GSTIN of the supplier or recipient.
Using an incorrect HSN or SAC Code.
Applying the wrong GST rate.
Charging CGST & SGST instead of IGST (or vice versa).
Omitting the Place of Supply in inter-State transactions.
Forgetting the Reverse Charge declaration where applicable.
Incorrect calculation of taxable value or GST.
Not mentioning the total invoice value in words, where required by internal business practice.
Failure to maintain proper invoice records for audit and GST compliance.

Key Points

A GST Tax Invoice should contain all the mandatory particulars prescribed under Section 31 of the CGST Act, 2017 and Rule 46 of the CGST Rules, 2017.
A properly prepared invoice helps determine GST liability, facilitates GST return filing, and enables eligible recipients to claim Input Tax Credit (ITC).
Businesses should ensure accurate GST rates, HSN/SAC codes, Place of Supply, and tax calculations while preparing invoices.
Maintaining a standard invoice format improves compliance, minimizes errors, and simplifies audits and reconciliations.

Summary Table – GST Documents

Document	Legal Provision	Issued By	Purpose	GST Charged
Tax Invoice	Section 31	Registered supplier making taxable supplies	Record taxable supply and collect GST	Yes
Bill of Supply	Section 31(3)(c)	Composition taxpayer / Supplier of exempt supplies	Record exempt or composition supplies	No
Receipt Voucher	Section 31(3)(d)	Registered supplier	Receipt of advance payment	As applicable
Refund Voucher	Rule 51	Registered supplier	Refund of advance received	Adjustment of advance
Payment Voucher	Rule 52	Recipient under RCM	Payment made under Reverse Charge	Yes
Delivery Challan	Rule 55	Registered supplier	Movement of goods without supply	No
Invoice-cum-Bill of Supply	Rule 46A	Registered supplier	Taxable and exempt supplies to an unregistered person	Partly taxable

FAQ's

What is a GST Tax Invoice? Who is required to issue a Tax Invoice?

A GST Tax Invoice is a document issued by a registered supplier for taxable supplies of goods or services, showing the taxable value and GST charged. Every registered person making taxable supplies under the regular GST scheme is required to issue a Tax Invoice in accordance with Section 31 of the CGST Act, 2017.

Can an unregistered person collect GST?

No. Under Section 32 of the CGST Act, an unregistered person cannot collect GST from customers.

Is a QR Code mandatory on every GST invoice?

No. The QR Code requirement depends on the applicable provisions relating to E-Invoicing or Dynamic QR Codes. It is not mandatory for every GST invoice.

What is the difference between a QR Code and a Dynamic QR Code?

A QR Code generated under the E-Invoicing system is used for invoice authentication. A Dynamic QR Code is intended to facilitate digital payment on specified B2C invoices.

Can Input Tax Credit (ITC) be claimed without a valid Tax Invoice?

Generally, no. A valid Tax Invoice is one of the essential conditions for claiming ITC, subject to the provisions of the CGST Act, 2017.

Conclusion

The GST invoice system is the foundation of India's indirect tax framework. Every taxable transaction begins with the correct issuance of an invoice, making it one of the most critical compliance requirements under the CGST Act, 2017. A properly prepared GST invoice not only determines the supplier's tax liability but also enables the recipient to claim eligible Input Tax Credit (ITC). The provisions contained in Sections 31 to 34 of the CGST Act, 2017, together with the CGST Rules, 2017, establish a comprehensive framework covering Tax Invoices, Bills of Supply, Receipt Vouchers, Revised Invoices, Debit Notes, Credit Notes, E-Invoicing, Invoice Reference Numbers (IRN), QR Codes and Dynamic QR Codes. Compliance with these provisions helps businesses maintain accurate records, avoid disputes, reduce the risk of penalties and ensure smooth GST return filing. With the introduction of E-Invoicing and digital verification through QR Codes, the GST system has become more transparent, efficient and technology-driven. Businesses should stay updated with the latest CBIC notifications, use reliable accounting software, verify GST details before issuing invoices and maintain proper documentation for future audits. Whether you are a business owner, accountant, tax consultant, finance professional or student, a sound understanding of GST invoice provisions is essential for ensuring legal compliance and efficient tax management. Following the correct invoicing procedures not only strengthens internal controls but also contributes to a seamless flow of Input Tax Credit across the GST ecosystem.

Ghatuary

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GST Invoice Under GST (Section 31 to 34): Tax Invoice, Bill of Supply, Debit Note, Credit Note, E-Invoicing & IRN – Complete Guide with Examples (2026)

Introduction to GST Invoice

Meaning of Invoice under GST

Relevant Legal Provisions (Sections 31, 32, 33 & 34)

Section 31 – Tax Invoice, Bill of Supply and Other Documents

Section 32 – Prohibition on Unauthorized Collection of GST

Section 33 – Amount of Tax to be Indicated Separately

Section 34 – Debit Notes and Credit Notes

Types of GST Documents

Tax Invoice

Bill of Supply

Receipt Voucher

Refund Voucher

Payment Voucher

Delivery Challan

Invoice-cum-Bill of Supply

Who Should Issue a Tax Invoice?

Registered Person Making Taxable Supplies

Registered Recipient Liable Under Reverse Charge Mechanism (RCM)

Persons Not Required to Issue a Tax Invoice

Importance of Issuing a Proper Tax Invoice

Who Should Issue a Bill of Supply?

Registered Person Supplying Exempt Goods or Services

Registered Person Paying Tax Under the Composition Scheme

Why Composition Taxpayers Cannot Issue a Tax Invoice

Difference Between Tax Invoice and Bill of Supply

Time Limit for Issuing Invoice

Time Limit for Supply of Goods

Time Limit for Supply of Services

Time Limit for Continuous Supply

Time Limit for Sale on Approval Basis

Time Limit under Reverse Charge Mechanism (RCM)

Manner of Issuing GST Invoice

Manner of Issuing Invoice for Supply of Goods

Manner of Issuing Invoice for Supply of Services

Distribution of Invoice Copies

Computer-Generated GST Invoices

Electronic Invoices (E-Invoices)

Best Practices While Issuing GST Invoices

Mandatory Particulars of Tax Invoice

Mandatory Particulars of Bill of Supply

Revised Invoice

Debit Note

Credit Note

Special Provisions for GST Invoices

Banking Companies

Insurance Companies

Non-Banking Financial Companies (NBFCs)

Goods Transport Agency (GTA)

Passenger Transport Services

Cinema Tickets

E-Invoicing under Rule 48

Invoice Reference Number (IRN)

QR Code in GST Invoice

Dynamic QR Code for B2C Invoices

Difference between Tax Invoice, Bill of Supply, Debit Note & Credit Note

Practical GST Invoice Format

FAQ's

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