Time of Supply under GST – Section 12 & Section 13 Explained with Examples, RCM, Advance Payments

Introduction to Time of Supply under GST

Before understanding the rules for determining the Time of Supply under GST, it is important to understand why this concept is so significant. Under the Goods and Services Tax (GST) regime, tax is not payable merely because a transaction has been agreed upon or because goods have been manufactured or services have been planned. Instead, GST becomes payable only when the time of supply is determined according to the provisions of the GST law.

The concept of Time of Supply identifies the exact point at which a supply is considered to have taken place for taxation purposes. Once this point is determined, the liability to pay GST arises, and the supplier becomes responsible for reporting the transaction in the appropriate GST return. Therefore, Time of Supply acts as the foundation for deciding when GST should be paid to the Government.

In any business transaction, several events may occur at different times. A customer may place a purchase order today, the supplier may dispatch the goods after a few days, the invoice may be issued later, and payment may be received even after several weeks. Similarly, in the case of services, the agreement, completion of service, issuance of invoice, and receipt of payment may all occur on different dates. This creates uncertainty regarding the exact date on which GST becomes payable.

To eliminate this confusion, the Central Goods and Services Tax (CGST) Act, 2017 provides detailed provisions relating to Time of Supply under:

• Section 12 – Time of Supply of Goods
• Section 13 – Time of Supply of Services

These provisions specify which event should be considered for determining the tax liability in different situations such as forward charge, reverse charge, advance payments, vouchers, associated enterprises, interest or penalty, and other special cases. The objective is to ensure that GST is collected at the correct time and that there is uniformity in tax administration across the country.

Why Time of Supply is Important?

The concept of Time of Supply is one of the most important provisions under GST because it determines:

• The exact date on which GST liability arises.
• The tax period in which the transaction must be reported.
• The due date for payment of GST.
• The applicable GST rate when tax rates change.
• The interest liability in case of delayed payment.
• Proper compliance with GST return filing requirements.

Incorrect determination of the Time of Supply may lead to delayed payment of tax, interest liability, penalties, and disputes with the tax authorities. Therefore, every registered person must understand these provisions carefully.

Example

Suppose ABC Traders receives an order from XYZ Ltd. on 5 July 2026 for the supply of machinery worth ₹2,00,000.

Event	Date
Purchase Order Received	5 July 2026
Goods Dispatched	8 July 2026
Tax Invoice Issued	9 July 2026
Payment Received	25 July 2026

Although the order was received on 5 July and payment was received on 25 July, GST does not become payable based on these dates alone. The Time of Supply will be determined according to the provisions of Section 12 of the CGST Act, which generally considers the earlier of the invoice date or the payment date in forward charge cases where the invoice is issued within the prescribed time.

Key Points

• Time of Supply determines the exact point at which GST liability arises.
• Separate provisions exist for goods (Section 12) and services (Section 13).
• It helps determine the correct GST return period and payment due date.
• Different rules apply to forward charge, reverse charge, advances, vouchers, associated enterprises, and special transactions.
• Proper determination of the Time of Supply ensures accurate GST compliance and helps avoid interest, penalties, and litigation.

This chapter will explain each provision in detail with practical illustrations, flowcharts, comparison tables, and real-life GST examples to help students, professionals, and business owners understand the concept thoroughly.

What is Time of Supply?

Time of Supply is one of the most important concepts under the Goods and Services Tax (GST) law because it determines the exact date on which GST becomes payable to the Government. In simple words, the Time of Supply is the point in time when a transaction is legally treated as a taxable supply, and the liability to pay GST arises.

Every business transaction passes through several stages. A customer may place an order today, the supplier may dispatch the goods after a few days, issue the invoice later, and receive payment after several weeks. Similarly, in the case of services, the agreement, completion of service, invoice generation, and receipt of payment may all occur on different dates. Since these events do not always happen simultaneously, it becomes necessary to determine the specific event that triggers the GST liability.

To resolve this issue, the CGST Act, 2017 lays down detailed provisions for determining the Time of Supply. These provisions ensure that GST is paid at the correct time and that every taxpayer follows a uniform method for calculating tax liability. According to the Act:

• Section 12 deals with the Time of Supply of Goods.
• Section 13 deals with the Time of Supply of Services.

The Time of Supply generally depends on events such as:

• Date of issue of the tax invoice
• Date of receipt of payment
• Date of provision of services
• Date of receipt of goods
• Last date on which the invoice should have been issued
• Special provisions for Reverse Charge Mechanism (RCM), vouchers, advances, associated enterprises, and other specified cases.

Simple Definition

Time of Supply is the date on which a supply of goods or services is considered to have taken place under GST, and from that date the liability to pay GST arises.

Why is Time of Supply Necessary?

Without a defined Time of Supply, there would be confusion regarding the exact period in which GST should be paid. Different businesses could choose different dates such as the order date, dispatch date, invoice date, or payment date, leading to disputes and inconsistent tax reporting.

The Time of Supply provisions eliminate this uncertainty by prescribing clear rules for every type of transaction.

Practical Example – Goods

ABC Electronics sells a laptop worth ₹60,000 to XYZ Traders.

Particulars	Date
Purchase Order	5 August 2026
Goods Delivered	8 August 2026
Invoice Issued	9 August 2026
Payment Received	20 August 2026

Since the invoice is issued within the prescribed time, the Time of Supply under Section 12 will generally be the earlier of the Invoice Date or the Payment Date. Therefore, the Time of Supply is 9 August 2026, and GST becomes payable in the tax period covering August 2026.

Practical Example – Services

A Chartered Accountant provides GST consultancy services to a company.

Particulars	Date
Service Completed	10 September 2026
Invoice Issued	15 September 2026
Payment Received	30 September 2026

As the invoice is issued within the prescribed time, the Time of Supply under Section 13 will generally be the earlier of the Invoice Date or the Payment Date. Hence, GST liability arises on 15 September 2026.

Important Features of Time of Supply

• Determines the exact date on which GST liability arises.
• Ensures timely payment of GST to the Government.
• Helps identify the correct GST return period.
• Decides the applicable tax rate when GST rates change.
• Prevents disputes regarding delayed tax payment.
• Separate provisions apply to goods and services.
• Special rules exist for reverse charge, advances, vouchers, associated enterprises, and additional consideration such as interest and penalties.

Key Points

• Time of Supply is the cornerstone of GST compliance.
• It specifies when GST becomes payable, not merely when a business transaction begins.
• Every registered person must correctly determine the Time of Supply to avoid interest, penalties, and incorrect GST return filing.
• Sections 12 and 13 of the CGST Act provide comprehensive rules covering both normal and special situations.

Why is Time of Supply Important?

The Time of Supply is one of the most crucial concepts under the Goods and Services Tax (GST) because it determines when the liability to pay GST arises. Although a business transaction may involve multiple events—such as receiving a purchase order, dispatching goods, issuing an invoice, or receiving payment—the GST law requires taxpayers to identify a single point in time when the supply is deemed to have occurred for tax purposes.

Without clear Time of Supply provisions, businesses could interpret the taxable event differently, leading to inconsistent tax reporting, delayed tax payments, disputes with tax authorities, and loss of government revenue. To prevent such issues, Sections 12 and 13 of the CGST Act, 2017 prescribe detailed rules for determining the Time of Supply for goods and services respectively. These provisions ensure that GST is paid in the correct tax period and at the correct rate.

For every registered person, correctly determining the Time of Supply is essential because it affects GST payment, return filing, tax rate applicability, input tax credit, and overall compliance. Even a small mistake in identifying the Time of Supply can result in interest, penalties, notices from the tax department, and unnecessary litigation.

 

Importance of Time of Supply under GST

1. Determines the GST Liability Date

The primary purpose of the Time of Supply provisions is to identify the exact date on which GST becomes payable.

Once the Time of Supply is determined, the supplier becomes legally liable to pay GST to the Government.

Example

A supplier issues an invoice on 10 July 2026 and receives payment on 18 July 2026.

Since the invoice is issued within the prescribed time, the earlier of the invoice date or payment date becomes the Time of Supply. Therefore, GST liability arises on 10 July 2026.

 

2. Identifies the Correct GST Return Period

GST returns are filed tax period-wise. The Time of Supply determines the month or quarter in which the transaction should be reported.

Reporting the transaction in the wrong tax period may result in notices, late fees, and interest.

Example

If the Time of Supply falls in August, the outward supply must be reported in the GST return for August, even if payment is received in September.

 

3. Decides the Applicable GST Rate

Sometimes the Government revises GST rates. In such cases, the applicable tax rate depends upon the Time of Supply.

If the supply occurs before the rate revision, the old rate applies. If the Time of Supply occurs after the revision, the new GST rate becomes applicable.

Example

Suppose the GST rate on a product increases from 12% to 18% with effect from 1 October 2026.

• Invoice issued: 28 September 2026
• Payment received: 5 October 2026

If the Time of Supply is 28 September 2026, GST will be charged at 12%.

 

4. Prevents Delay in Payment of GST

Proper determination of the Time of Supply ensures that GST is paid within the prescribed due dates.

If a taxpayer delays payment because of an incorrect understanding of the taxable event, the department may levy:

• Interest on delayed payment
• Late fees
• Penalties in certain cases

Correct determination helps businesses avoid unnecessary financial costs.

 

5. Helps in Proper Accounting

Accounting entries are closely linked with GST liability.

The Time of Supply enables businesses to:

• Record GST liability correctly.
• Prepare accurate books of accounts.
• Reconcile invoices with GST returns.
• Avoid accounting mismatches.

This also improves the reliability of financial statements.

 

6. Ensures Proper Compliance under Forward Charge and Reverse Charge

The Time of Supply rules differ for:

• Forward Charge Mechanism (FCM)
• Reverse Charge Mechanism (RCM)

Understanding these provisions helps taxpayers discharge GST liability correctly under both mechanisms without errors.

 

7. Determines the Correct Time for Claiming Input Tax Credit (ITC)

Although Input Tax Credit depends upon fulfillment of statutory conditions, determining the correct tax period begins with identifying the proper Time of Supply.

Proper reporting by the supplier facilitates timely reflection of invoices in GST records and smoother ITC claims by recipients.

 

8. Reduces Tax Disputes

Uniform Time of Supply provisions ensure that every taxpayer follows the same legal principles while determining GST liability.

This minimizes disputes regarding:

• Invoice dates
• Payment dates
• Advance receipts
• Delayed invoices
• Reverse charge transactions
• Voucher transactions

Consequently, both taxpayers and tax authorities benefit from greater certainty.

 

9. Important During Advance Payments

GST law contains special provisions regarding advance payments and excess advances in certain cases.

The Time of Supply provisions clarify whether GST is payable immediately upon receipt of an advance or when the advance is adjusted against a future invoice, thereby eliminating confusion.

 

10. Covers Special Transactions

The Time of Supply provisions are not limited to ordinary sales. They also provide separate rules for:

• Reverse Charge Mechanism (RCM)
• Associated enterprises
• Vouchers and coupons
• Interest, late fee, and penalty
• Residuary cases where no specific rule applies

These provisions ensure that almost every GST transaction has a clearly identifiable taxable event.

 

Practical Illustration

XYZ Traders sells machinery worth ₹5,00,000.

Particulars	Date
Purchase Order Received	5 August 2026
Goods Dispatched	8 August 2026
Invoice Issued	10 August 2026
Payment Received	25 August 2026

Since the invoice is issued within the prescribed period, the earlier of the invoice date or payment date becomes the Time of Supply.

Time of Supply = 10 August 2026

Therefore:

• GST liability arises on 10 August 2026.
• The transaction must be reported in the August GST return.
• GST must be paid within the due date applicable for the August tax period.

 

Summary Table – Importance of Time of Supply

Importance	Benefit
Determines GST liability	Identifies the exact date on which tax becomes payable
Correct return filing	Ensures reporting in the correct GST tax period
Applicable GST rate	Helps determine whether the old or revised GST rate applies
Prevents interest and penalties	Avoids delayed payment consequences
Better accounting	Enables accurate accounting and reconciliation
Compliance with GST law	Ensures compliance under FCM and RCM
Reduces litigation	Minimizes disputes with tax authorities
Covers special cases	Provides rules for advances, vouchers, associated enterprises, and interest

 

Key Points

• Time of Supply is the trigger point for GST liability.
• It determines when GST becomes payable, which GST return should include the transaction, and which tax rate is applicable.
• Proper determination of the Time of Supply helps businesses avoid interest, penalties, return mismatches, and tax disputes.
• Every registered taxpayer should understand these provisions thoroughly to ensure accurate GST compliance and smooth business operations.

Legal Provisions

The Time of Supply provisions under the GST law determine the exact date on which the liability to pay Goods and Services Tax (GST) arises. Since transactions involving goods and services occur differently, the Central Goods and Services Tax (CGST) Act, 2017 provides separate legal provisions for each.

The relevant provisions are:

• Section 12 – Time of Supply of Goods
• Section 13 – Time of Supply of Services

These sections prescribe the rules for determining the taxable event under various circumstances such as forward charge, reverse charge, advance payments, vouchers, associated enterprises, and other special cases. The objective is to ensure that GST is paid in the correct tax period and that taxpayers follow a uniform method for determining tax liability.

 

Section 12 – Time of Supply of Goods

Section 12 of the CGST Act, 2017 lays down the provisions for determining the Time of Supply of Goods.

It specifies the exact date on which GST becomes payable when taxable goods are supplied.

Generally, the Time of Supply depends upon factors such as:

• Date of issue of tax invoice
• Date of receipt of payment
• Last date on which the invoice should have been issued
• Date of receipt of goods in certain Reverse Charge cases
• Special provisions relating to vouchers and other specified situations.

Scope of Section 12

Section 12 applies to:

• Supply of taxable goods
• Forward Charge Mechanism (FCM)
• Reverse Charge Mechanism (RCM)
• Advance receipts (where applicable)
• Vouchers relating to goods
• Other special situations prescribed under GST.

Objective of Section 12

The purpose of Section 12 is to identify the exact date on which GST liability arises for goods so that:

• GST is paid within the prescribed time.
• The correct tax period is determined.
• The correct GST rate is applied.
• GST returns are filed accurately.

 

Important Situations Covered under Section 12

Section 12 broadly covers the following situations:

• Invoice issued within the prescribed period.
• Invoice not issued within the prescribed period.
• Reverse Charge Mechanism (RCM).
• Advance payments and excess advances.
• Vouchers and coupons.
• Residuary cases where no specific provision applies.

Each of these situations has separate rules for determining the Time of Supply.

 

Section 13 – Time of Supply of Services

Section 13 of the CGST Act, 2017 governs the Time of Supply of Services.

Since services are generally performed over a period of time rather than delivered instantly like goods, the determination of the taxable event differs from that of goods.

Section 13 specifies the rules for identifying the exact date on which GST liability arises for the supply of services.

Scope of Section 13

Section 13 applies to:

• Supply of taxable services
• Forward Charge Mechanism (FCM)
• Reverse Charge Mechanism (RCM)
• Associated enterprises
• Advance payments
• Vouchers relating to services
• Interest, late fee, and penalty
• Other specified transactions.

Objective of Section 13

The purpose of Section 13 is to ensure that GST on services is paid at the appropriate time by prescribing uniform rules for determining the taxable event.

 

Important Situations Covered under Section 13

The provisions of Section 13 deal with:

• Invoice issued within the prescribed period.
• Invoice not issued within the prescribed period.
• Reverse Charge Mechanism.
• Associated enterprises.
• Vouchers and coupons.
• Interest, late fee, and penalty.
• Residuary provisions where no specific rule is available.

 

Difference between Section 12 and Section 13

Particulars	Section 12	Section 13
Applicable To	Supply of Goods	Supply of Services
Nature of Supply	Tangible movable goods	Intangible services
Governing Provision	Time of Supply of Goods	Time of Supply of Services
Reverse Charge Rules	Covered	Covered
Advance Payment	Special provisions applicable	Special provisions applicable
Vouchers	Covered	Covered
Associated Enterprises	Not specifically applicable	Special provisions available
Interest/Penalty	Special provisions	Special provisions

---

Legal Framework at a Glance

Section	Subject	Purpose
Section 12	Time of Supply of Goods	Determines the date on which GST becomes payable for goods
Section 13	Time of Supply of Services	Determines the date on which GST becomes payable for services

 

Practical Illustration

Suppose ABC Ltd. sells machinery and also provides installation services.

Goods Transaction

• Invoice issued: 10 July 2026
• Payment received: 25 July 2026

The Time of Supply for the machinery will be determined under Section 12.

Service Transaction

• Installation completed: 15 July 2026
• Invoice issued: 18 July 2026
• Payment received: 30 July 2026

The Time of Supply for the installation service will be determined under Section 13.

Although both transactions relate to the same customer, different legal provisions apply because one relates to goods while the other relates to services.

Key Points

• The CGST Act contains separate provisions for determining the Time of Supply of goods and services.
• Section 12 governs the Time of Supply of Goods.
• Section 13 governs the Time of Supply of Services.
• These provisions identify the exact point at which GST liability arises.
• They ensure correct GST payment, accurate return filing, proper tax rate application, and uniform compliance across all taxable transactions.
• The following sections of this chapter explain each provision in detail with practical examples, flowcharts, and case studies for better understanding.

Meaning of Date of Payment

The Date of Payment is one of the most important factors for determining the Time of Supply under the Goods and Services Tax (GST) law. In several situations, especially under Forward Charge Mechanism (FCM) and Reverse Charge Mechanism (RCM), GST liability depends upon the date on which payment is made or received.

The CGST Act recognizes that there can be a difference between the date on which an accounting entry is recorded in the books and the date on which the amount is actually credited to or debited from the bank account. To avoid confusion and ensure consistency, GST law prescribes a specific method for determining the Date of Payment.

 

Meaning of Date of Payment for the Supplier

For the supplier, the Date of Payment is the earlier of the following two dates:

1. Date on which the payment is recorded in the supplier's books of account, or
2. Date on which the payment is actually credited to the supplier's bank account.

Whichever of the above two dates occurs first is treated as the Date of Payment for GST purposes.

Formula

Date of Payment (Supplier) = Earlier of:

• Book entry date in supplier's books
• Actual credit date in supplier's bank account

 

Example 1 – Supplier

ABC Traders issued an invoice to XYZ Ltd.

Particulars	Date
Entry recorded in books	8 August 2026
Amount credited in bank	10 August 2026

Date of Payment = 8 August 2026

Since the accounting entry is earlier than the bank credit date, 8 August 2026 will be considered the Date of Payment.

 

Example 2 – Supplier

Particulars	Date
Entry recorded in books	15 September 2026
Amount credited in bank	13 September 2026

Date of Payment = 13 September 2026

Here, the bank credit occurs earlier than the accounting entry; therefore, the bank credit date becomes the Date of Payment.

 

Meaning of Date of Payment for the Recipient

For the recipient, the Date of Payment is the earlier of:

1. Date on which payment is recorded in the recipient's books of account, or
2. Date on which the amount is actually debited from the recipient's bank account.

The earlier of these two dates is considered the Date of Payment under GST.

Formula

Date of Payment (Recipient) = Earlier of:

• Book entry date in recipient's books
• Actual debit date in recipient's bank account

 

Example 3 – Recipient

XYZ Ltd. makes payment to ABC Traders.

Particulars	Date
Payment entry recorded in books	12 October 2026
Amount debited from bank	14 October 2026

Date of Payment = 12 October 2026

Since the accounting entry is earlier, it is treated as the Date of Payment.

 

Example 4 – Recipient

Particulars	Date
Payment recorded in books	20 November 2026
Amount debited from bank	18 November 2026

Date of Payment = 18 November 2026

The bank debit occurs earlier; therefore, it becomes the Date of Payment.

 

Difference Between Supplier and Recipient

Particulars	Supplier	Recipient
Accounting Record	Book entry in supplier's books	Book entry in recipient's books
Bank Transaction	Actual credit in supplier's bank	Actual debit from recipient's bank
Date of Payment	Earlier of book entry or bank credit	Earlier of book entry or bank debit

 

Why is the Date of Payment Important?

The Date of Payment plays a significant role in determining the Time of Supply because it helps to:

• Determine the exact date on which GST liability arises.
• Identify the correct GST return period.
• Decide the applicable GST rate when rates change.
• Apply the provisions relating to advances.
• Determine the Time of Supply under Reverse Charge Mechanism (RCM).
• Ensure timely payment of GST and avoid interest or penalties.

 

Practical Illustration

Suppose ABC Ltd. receives payment from a customer.

Event	Date
Invoice issued	5 December 2026
Entry made in books	8 December 2026
Amount credited in bank	10 December 2026

For GST purposes:

• Date of Payment = 8 December 2026
• If the invoice is issued within the prescribed period, the Time of Supply will generally be determined by comparing the invoice date (5 December) and the Date of Payment (8 December). The earlier date, 5 December 2026, will become the Time of Supply.

Key Points

• The Date of Payment is a legally defined concept under GST and is not always the same as the actual bank transaction date.
• For the supplier, it is the earlier of the book entry date or the bank credit date.
• For the recipient, it is the earlier of the book entry date or the bank debit date.
• Correct determination of the Date of Payment is essential for identifying the Time of Supply, ensuring accurate GST compliance, timely tax payment, and proper return filing.

Time of Supply of Goods under Forward Charge

Under the Forward Charge Mechanism (FCM), the supplier of goods is responsible for collecting GST from the recipient and depositing it with the Government. The provisions relating to the Time of Supply under Forward Charge are contained in Section 12 of the CGST Act, 2017.

The Time of Supply determines the exact date on which the supplier becomes liable to pay GST. Since different events such as issuing an invoice, receiving payment, and delivering goods may occur on different dates, Section 12 prescribes specific rules to determine the taxable event.

The rules differ depending upon whether the tax invoice is issued within the prescribed time or after the prescribed time.

 

A. Invoice Issued Within the Prescribed Time

Where the supplier issues the tax invoice within the time prescribed under Section 31 of the CGST Act, the Time of Supply shall be the earlier of:

1. Date of issue of the invoice, or
2. Date of receipt of payment.

This is the general rule applicable to most supplies of goods under the Forward Charge Mechanism.

Formula

Time of Supply = Earlier of:

• Invoice Date
• Date of Receipt of Payment

 

Understanding with Timeline

Event	Date
Purchase Order	5 July 2026
Goods Delivered	8 July 2026
Invoice Issued	9 July 2026
Payment Received	20 July 2026

Time of Supply = 9 July 2026

Reason:

• Invoice Date = 9 July
• Payment Date = 20 July

The earlier date is 9 July, therefore GST becomes payable on 9 July 2026.

 

Practical Example 1

ABC Traders supplies office furniture worth ₹2,50,000.

Particulars	Date
Invoice Issued	12 August 2026
Payment Received	25 August 2026

Since the invoice is issued within the prescribed time,

Time of Supply = 12 August 2026

GST liability arises on 12 August 2026.

 

Practical Example 2

XYZ Electronics sells laptops.

Particulars	Date
Invoice Issued	15 September 2026
Advance Payment Received	10 September 2026

Here,

• Invoice Date = 15 September
• Payment Date = 10 September

The earlier date is 10 September 2026.

Therefore,

Time of Supply = 10 September 2026

GST becomes payable on the advance received, subject to the applicable provisions.

 

B. Invoice Not Issued Within the Prescribed Time

Sometimes the supplier fails to issue the invoice within the period prescribed under GST law.

In such cases, the Time of Supply is determined differently.

The Time of Supply shall be the earlier of:

1. Last date on which the invoice was required to be issued, or
2. Date of receipt of payment.

Formula

Time of Supply = Earlier of:

• Last date for issuing the invoice
• Date of Receipt of Payment

This provision ensures that a supplier cannot postpone GST liability simply by delaying the issuance of the invoice.

 

Practical Example 3

ABC Ltd. supplied goods on 5 October 2026.

The invoice should have been issued on 5 October 2026, but it was actually issued on 20 October 2026.

Payment was received on 18 October 2026.

Particulars	Date
Last Date for Invoice	5 October 2026
Actual Invoice Date	20 October 2026
Payment Date	18 October 2026

The comparison is between:

• Last permissible invoice date = 5 October
• Payment date = 18 October

Time of Supply = 5 October 2026

GST liability arises on 5 October 2026, not on the delayed invoice date.

 

Practical Example 4

A supplier delivers machinery on 10 November 2026.

The invoice should have been issued on 10 November, but it was issued on 30 November.

The customer paid an advance on 8 November.

Particulars	Date
Last Date for Invoice	10 November 2026
Actual Invoice Date	30 November 2026
Payment Date	8 November 2026

The earlier date is 8 November 2026.

Therefore,

Time of Supply = 8 November 2026

GST becomes payable on 8 November 2026.

 

Comparative Summary

Situation	Time of Supply
Invoice issued within prescribed time	Earlier of Invoice Date or Payment Date
Invoice not issued within prescribed time	Earlier of Last Date for Issuing Invoice or Payment Date

 

Important Points to Remember

• These provisions apply only to the Forward Charge Mechanism, where the supplier is liable to pay GST.
• If the invoice is issued within the prescribed period, compare the Invoice Date and the Date of Payment.
• If the invoice is delayed, compare the Last Permissible Invoice Date and the Date of Payment.
• The earlier date always becomes the Time of Supply.
• The supplier cannot postpone GST liability merely by delaying the issuance of the invoice.
• Separate provisions apply for Reverse Charge Mechanism (RCM), which are discussed later in this chapter.

 

Exam Tips

• Remember the keyword "Earlier Of" for all normal Forward Charge transactions.
• Do not compare the actual delayed invoice date when the invoice is issued late; compare the last date on which the invoice was required to be issued with the payment date.
• Distinguish clearly between Forward Charge and Reverse Charge provisions, as the rules differ significantly.

Key Points

• Under Section 12, the supplier is liable to pay GST under the Forward Charge Mechanism.
• Invoice issued within time: Time of Supply = Earlier of Invoice Date or Payment Date.
• Invoice not issued within time: Time of Supply = Earlier of Last Date for Issuing Invoice or Payment Date.
• Correct determination of the Time of Supply ensures timely GST payment, accurate return filing, and compliance with the CGST Act, 2017.

Time of Supply of Services under Forward Charge

Under the Forward Charge Mechanism (FCM), the supplier of services is responsible for collecting GST from the recipient and depositing it with the Government. The provisions governing the Time of Supply of Services are contained in Section 13 of the Central Goods and Services Tax (CGST) Act, 2017.

Unlike the supply of goods, services are often rendered over a period of time. A service may commence on one date, be completed on another date, the invoice may be issued later, and payment may be received even after several weeks or months. Therefore, Section 13 provides specific rules to determine the exact date on which GST liability arises.

The determination of the Time of Supply depends on whether the tax invoice is issued within the prescribed time or after the prescribed time.

 

A. Invoice Issued Within the Prescribed Time

Where the supplier issues the tax invoice within the period prescribed under Section 31 of the CGST Act, the Time of Supply shall be the earlier of:

1. Date of issue of the invoice, or
2. Date of receipt of payment.

This is the general rule applicable to most taxable supplies of services under the Forward Charge Mechanism.

Formula

Time of Supply = Earlier of:

• Invoice Date
• Date of Receipt of Payment

 

Practical Example 1

ABC Consultants provides GST consultancy services to XYZ Ltd.

Particulars	Date
Service Completed	5 July 2026
Invoice Issued	10 July 2026
Payment Received	25 July 2026

Since the invoice is issued within the prescribed time:

• Invoice Date = 10 July 2026
• Payment Date = 25 July 2026

Time of Supply = 10 July 2026

GST liability arises on 10 July 2026.

 

Practical Example 2 (Advance Received)

A software company receives an advance before issuing the invoice.

Particulars	Date
Advance Received	12 August 2026
Service Completed	20 August 2026
Invoice Issued	25 August 2026

Comparison:

• Invoice Date = 25 August 2026
• Payment Date = 12 August 2026

The earlier date is 12 August 2026.

Time of Supply = 12 August 2026

Therefore, GST liability arises on the date of receipt of the advance, subject to the applicable provisions.

 

B. Invoice Not Issued Within the Prescribed Time

If the supplier fails to issue the tax invoice within the prescribed period, the GST law adopts a different method for determining the Time of Supply.

In such cases, the Time of Supply shall be the earlier of:

1. Date of completion of the service, or
2. Date of receipt of payment.

Formula

Time of Supply = Earlier of:

• Date of Completion of Service
• Date of Receipt of Payment

This provision prevents suppliers from postponing GST liability by intentionally delaying the issuance of the invoice.

 

Practical Example 3

ABC Architects completed a building design project on 10 September 2026, but issued the invoice on 30 September 2026.

Payment was received on 20 September 2026.

Particulars	Date
Service Completed	10 September 2026
Invoice Issued	30 September 2026
Payment Received	20 September 2026

Comparison:

• Completion Date = 10 September 2026
• Payment Date = 20 September 2026

The earlier date is 10 September 2026.

Time of Supply = 10 September 2026

GST becomes payable on 10 September 2026.

 

Practical Example 4

A marketing agency completes an advertising campaign.

Particulars	Date
Service Completed	18 October 2026
Invoice Issued	5 November 2026
Advance Received	12 October 2026

Comparison:

• Completion Date = 18 October 2026
• Payment Date = 12 October 2026

The earlier date is 12 October 2026.

Time of Supply = 12 October 2026

GST liability arises on 12 October 2026.

 

Comparative Summary

Situation	Time of Supply
Invoice issued within prescribed time	Earlier of Invoice Date or Payment Date
Invoice not issued within prescribed time	Earlier of Completion of Service or Payment Date

 

Difference Between Goods and Services under Forward Charge

Particulars	Goods (Section 12)	Services (Section 13)
Invoice issued within time	Earlier of Invoice Date or Payment Date	Earlier of Invoice Date or Payment Date
Invoice not issued within time	Earlier of Last Date for Issuing Invoice or Payment Date	Earlier of Completion of Service or Payment Date
Applicable Section	Section 12	Section 13

 

Important Points to Remember

• These provisions apply only where the supplier is liable to pay GST under the Forward Charge Mechanism (FCM).
• When the invoice is issued within the prescribed period, compare the Invoice Date and the Date of Payment.
• If the invoice is not issued within the prescribed period, compare the Date of Completion of Service and the Date of Payment.
• The earlier of the two dates becomes the Time of Supply.
• Delaying the issuance of the invoice does not postpone the GST liability.

 

Exam Tips

• For services, remember:
• Invoice issued within time → Earlier of Invoice Date or Payment Date.
• Invoice not issued within time → Earlier of Completion of Service or Payment Date.
• Do not confuse the rule for goods with that for services. In goods, the comparison is with the last date for issuing the invoice, whereas in services it is with the date of completion of the service.
• Questions in CA, CMA, CS, and GST practitioner examinations often test this distinction.

 

Key Points

• Section 13 of the CGST Act, 2017 governs the Time of Supply of Services under the Forward Charge Mechanism.
• Invoice issued within the prescribed period: Time of Supply = Earlier of Invoice Date or Payment Date.
• Invoice not issued within the prescribed period: Time of Supply = Earlier of Completion of Service or Payment Date.
• Correct identification of the Time of Supply ensures timely GST payment, proper return filing, and compliance with GST law.

Time of Supply under Reverse Charge Mechanism (RCM)

Under the Reverse Charge Mechanism (RCM), the liability to pay GST shifts from the supplier to the recipient of goods or services. Instead of the supplier collecting and depositing GST, the recipient is responsible for paying GST directly to the Government.

Since the recipient is liable to pay tax, the rules for determining the Time of Supply under Reverse Charge are different from those applicable under the Forward Charge Mechanism.

The provisions relating to the Time of Supply under Reverse Charge are prescribed under:

• Section 12(3) – Time of Supply of Goods under Reverse Charge
• Section 13(3) – Time of Supply of Services under Reverse Charge

These provisions ensure that GST liability arises at the earliest possible point and prevent unnecessary delays in tax payment.

 

A. Time of Supply of Goods under Reverse Charge

For the supply of goods under Reverse Charge, the Time of Supply shall be the earliest of the following dates:

1. Date of payment, or
2. 31st day immediately following the date of issue of invoice by the supplier, or
3. Date of receipt of goods.

If none of the above can be determined, the date of entry in the books of account of the recipient shall be considered as the Time of Supply (Residuary Provision).

Formula

Time of Supply (Goods under RCM) = Earliest of:

• Date of Payment
• 31st Day from Supplier's Invoice Date
• Date of Receipt of Goods

If none can be determined:

Date of Book Entry in Recipient's Books

 

Practical Example 1 – Goods

ABC Ltd. purchases goods covered under RCM.

Particulars	Date
Supplier's Invoice Date	1 August 2026
Goods Received	8 August 2026
Payment Made	20 August 2026

31st day from the invoice date = 1 September 2026

Comparison:

• Payment Date = 20 August
• 31st Day = 1 September
• Goods Received = 8 August

Time of Supply = 8 August 2026

Since the date of receipt of goods is the earliest, GST liability arises on 8 August 2026.

 

Practical Example 2 – Goods

Particulars	Date
Supplier's Invoice Date	5 October 2026
Goods Received	12 October 2026
Payment Made	8 October 2026

31st day from the invoice = 5 November 2026

Comparison:

• Payment Date = 8 October
• Goods Received = 12 October
• 31st Day = 5 November

Time of Supply = 8 October 2026

 

B. Time of Supply of Services under Reverse Charge

For the supply of services under Reverse Charge, the Time of Supply shall be the earliest of:

1. Date of payment, or
2. 61st day immediately following the date of issue of invoice by the supplier.

If neither of these dates can be determined, the date of entry in the books of account of the recipient shall be considered as the Time of Supply.

Formula

Time of Supply (Services under RCM) = Earliest of:

• Date of Payment
• 61st Day from Supplier's Invoice Date

If neither can be determined:

Date of Book Entry in Recipient's Books

 

Practical Example 3 – Services

XYZ Ltd. receives legal consultancy services that are taxable under RCM.

Particulars	Date
Supplier's Invoice Date	10 July 2026
Payment Made	20 August 2026

61st day from the invoice = 9 September 2026

Comparison:

• Payment Date = 20 August
• 61st Day = 9 September

Time of Supply = 20 August 2026

GST becomes payable on 20 August 2026.

 

Practical Example 4 – Services

A company receives sponsorship services.

Particulars	Date
Supplier's Invoice Date	1 November 2026
Payment Made	20 January 2027

61st day from the invoice = 1 January 2027

Comparison:

• Payment Date = 20 January 2027
• 61st Day = 1 January 2027

Time of Supply = 1 January 2027

Although payment is made later, GST liability arises on the 61st day because it occurs earlier.

 

C. Residuary Provision

Sometimes, the Time of Supply cannot be determined using the normal provisions.

In such situations:

• Goods: If the payment date, receipt date, or 31st day cannot be determined, the date of entry in the recipient's books of account becomes the Time of Supply.
• Services: If the payment date or 61st day cannot be determined, the date of entry in the recipient's books of account becomes the Time of Supply.

 

Comparative Table – Time of Supply under RCM

Particulars	Goods	Services
Governing Section	Section 12(3)	Section 13(3)
Person Liable to Pay GST	Recipient	Recipient
First Criterion	Date of Payment	Date of Payment
Second Criterion	31st Day from Supplier's Invoice	61st Day from Supplier's Invoice
Third Criterion	Date of Receipt of Goods	Not Applicable
Residuary Provision	Date of Entry in Recipient's Books	Date of Entry in Recipient's Books

 

Difference between Forward Charge and Reverse Charge

Particulars	Forward Charge	Reverse Charge
GST Liability	Supplier	Recipient
Goods	Earlier of Invoice Date or Payment Date (or last permissible invoice date in specified cases)	Earliest of Payment Date, 31st Day from Invoice, or Receipt of Goods
Services	Earlier of Invoice Date or Payment Date (or completion of service in specified cases)	Earliest of Payment Date or 61st Day from Invoice
Book Entry Rule	Generally, not applicable	Applicable when normal rules cannot determine the Time of Supply

 

Important Points to Remember

• Under Reverse Charge, the recipient is responsible for paying GST.
• For goods, compare:
• Date of Payment
• 31st day from the supplier's invoice
• Date of Receipt of Goods
• For services, compare:
• Date of Payment
• 61st day from the supplier's invoice
• If the Time of Supply cannot be determined using these rules, the date of entry in the recipient's books of account becomes the Time of Supply.
• The Time of Supply under Reverse Charge differs significantly from the Forward Charge Mechanism and should not be confused.

 

Exam Tips

• Goods under RCM → Remember "31 + Receipt".
• Services under RCM → Remember "61".
• The date of receipt of goods is relevant only for goods, not for services.
• The book entry rule acts as a residuary provision when the normal criteria cannot determine the Time of Supply.

Key Points

• Under the Reverse Charge Mechanism, the recipient—not the supplier—is liable to pay GST.
• Goods (Section 12): Time of Supply is the earliest of the Date of Payment, 31st day from the supplier's invoice, or Date of Receipt of Goods.
• Services (Section 13): Time of Supply is the earliest of the Date of Payment or the 61st day from the supplier's invoice.
• If the Time of Supply cannot be determined through these provisions, the date of entry in the recipient's books of account will be treated as the Time of Supply. These rules help ensure timely payment of GST and proper compliance with the CGST Act, 2017.

Treatment of Advance Payments

One of the important aspects of determining the Time of Supply under GST is the treatment of advance payments. In business transactions, it is common for suppliers to receive an advance from customers before supplying goods or completing services. The GST law contains specific provisions to determine whether GST becomes payable at the time of receiving the advance or at a later stage.

The treatment of advances differs for goods and services. In addition, the GST law also provides a special relaxation for small excess advances (commonly referred to as "Chiller Advance") up to ₹1,000. These provisions help businesses determine the correct Time of Supply and ensure timely payment of GST.

 

A. Advance Payments for Goods

Under the present GST provisions, receipt of an advance for the supply of goods generally does not trigger GST liability for most registered suppliers. GST is ordinarily payable when the tax invoice is issued in accordance with the applicable Time of Supply provisions.

Therefore, if a supplier receives an advance before supplying goods, GST is generally paid when the invoice for the supply is issued (subject to the applicable legal provisions and notifications).

Example 1

ABC Traders receives an advance of ₹50,000 on 5 July 2026 for machinery that will be supplied later.

Particulars	Date
Advance Received	5 July 2026
Goods Delivered	20 July 2026
Invoice Issued	20 July 2026

GST will generally become payable on the invoice date, i.e., 20 July 2026, rather than on the date of receipt of the advance.

 

B. Advance Payments for Services

For the supply of services, the Time of Supply provisions under Section 13 provide that where the invoice is issued within the prescribed period, the Time of Supply is generally the earlier of:

• Date of issue of the invoice, or
• Date of receipt of payment.

Therefore, when an advance is received before issuing the invoice, the advance itself may determine the Time of Supply.

Formula

Time of Supply (Services) = Earlier of:

• Invoice Date
• Date of Receipt of Advance/Payment

 

Example 2

XYZ Consultants receives an advance before providing consultancy services.

Particulars	Date
Advance Received	10 August 2026
Service Completed	25 August 2026
Invoice Issued	28 August 2026

Comparison:

• Advance Received = 10 August 2026
• Invoice Date = 28 August 2026

Time of Supply = 10 August 2026

GST liability arises on 10 August 2026 because the advance was received before the invoice was issued.

 

C. ₹1,000 Excess Advance (Chiller Advance)

The GST law provides a special relaxation where the amount received from a customer is more than the value of the invoice, but the excess amount does not exceed ₹1,000.

This excess amount is commonly referred to as a "Chiller Advance."

In such cases, the supplier has two options for determining the Time of Supply.

Option 1 – Pay GST on Receipt of Excess Advance

The supplier may treat the excess amount as an advance.

Accordingly:

• GST is paid immediately on receipt of the excess amount.
• The Time of Supply for the excess amount becomes the date of receipt of the advance.

Example

Invoice Amount = ₹50,000

Amount Received = ₹50,700

Excess Received = ₹700

ABC Ltd. may choose to pay GST on ₹700 immediately.

Time of Supply = Date of Receipt of ₹700

 

Option 2 – Pay GST When Adjusted Against the Next Invoice

Instead of paying GST immediately, the supplier may carry forward the excess amount and adjust it against the next tax invoice.

In this case:

• GST is not payable immediately.
• The Time of Supply becomes the date of the next invoice against which the excess advance is adjusted.

Example

Invoice Amount = ₹80,000

Amount Received = ₹80,600

Excess Amount = ₹600

ABC Ltd. decides to adjust the ₹600 against the next invoice.

Therefore:

• GST is not paid on the date of receipt.
• GST becomes payable when the next invoice is issued.

 

Comparison – Normal Advance vs ₹1,000 Excess Advance

Particulars	Normal Advance	₹1,000 Excess Advance (Chiller Advance)
Nature	Advance received before supply	Excess amount received over invoice value (up to ₹1,000)
GST Liability	Determined under normal Time of Supply provisions	Supplier may choose either immediate payment or adjustment in the next invoice
Flexibility	No special option	Two alternatives available
Purpose	Regular business advance	Simplifies treatment of small excess collections

 

Practical Illustration

ABC Traders issues an invoice for ₹1,20,000.

The customer mistakenly pays ₹1,20,800.

Excess Amount = ₹800

Since the excess does not exceed ₹1,000, the supplier has the following choices:

Option 1

• Pay GST on ₹800 immediately.
• Time of Supply = Date of Receipt of ₹800

Option 2

• Carry forward the ₹800.
• Adjust it against the next invoice.
• Time of Supply = Date of the Next Invoice

This relaxation reduces unnecessary compliance for minor excess receipts.

 

Summary Table

Particulars	Goods	Services
Advance Received	GST generally payable when the invoice is issued (subject to applicable provisions)	Earlier of Invoice Date or Date of Receipt of Advance
Governing Provision	Section 12	Section 13
Effect of Advance	Normally does not trigger immediate GST liability for most suppliers	May determine the Time of Supply
₹1,000 Excess Advance	Two options available	Two options available

 

Important Points to Remember

• The treatment of advances differs for goods and services.
• Under the chapter provisions, services generally follow the earlier of the invoice date or payment date rule.
• For an excess advance not exceeding ₹1,000, the supplier has two options:
• Pay GST immediately on receipt of the excess amount, or
• Defer GST and pay it when the excess amount is adjusted against the next invoice.
• This special relaxation is intended to simplify compliance for small excess collections.

 

Exam Tips

• Remember the term "Chiller Advance" = Excess amount up to ₹1,000.
• Always recall the two options available for its treatment:
1. GST on the date of receipt.
2. GST on the date of adjustment in the next invoice.
• Distinguish the treatment of goods and services, as Time of Supply rules differ.

 

Key Points

• Advance payments influence the Time of Supply under GST.
• For services, an advance may determine the Time of Supply because the earlier of the invoice date and the date of receipt of payment is considered.
• For goods, GST is generally payable when the tax invoice is issued, subject to the applicable legal provisions.
• Where an excess amount of up to ₹1,000 is received over the invoice value, the supplier may either pay GST immediately or adjust the amount against the next invoice, making compliance simpler for minor excess receipts.

Associated Enterprises

Transactions between Associated Enterprises (AEs) are common in multinational companies and corporate groups. These enterprises often provide management, technical, consultancy, marketing, or other support services to one another. Since such transactions may not involve immediate payment, the GST law prescribes a special rule for determining the Time of Supply.

Under Section 13 of the CGST Act, 2017, a separate provision applies to services supplied by an Associated Enterprise located outside India to a recipient located in India. In such cases, the Time of Supply is determined differently from the normal rules applicable to services under the Forward Charge Mechanism.

The objective of this provision is to ensure that GST liability does not get postponed merely because payment has not yet been made between associated entities.

 

What is an Associated Enterprise?

An Associated Enterprise refers to an enterprise that participates, directly or indirectly, in the management, control, or capital of another enterprise, or where the same persons participate in the management, control, or capital of both enterprises.

In simple words, Associated Enterprises are related companies or group companies having significant ownership, control, or management relationships.

Examples of Associated Enterprises

• Parent Company and Subsidiary Company
• Holding Company and Wholly Owned Subsidiary
• Two Subsidiaries of the Same Holding Company
• Foreign Head Office and Indian Branch
• Companies under Common Management

 

Legal Provision

As per Section 13, in the case of services supplied by an Associated Enterprise located outside India, the Time of Supply shall be the earlier of:

1. Date of payment, or
2. Date of entry in the books of account of the recipient.

This is a special provision and overrides the normal rule applicable to services under the Forward Charge Mechanism.

 

Formula

Time of Supply = Earlier of:

• Date of Payment
• Date of Entry in the Books of Account of the Recipient

 

Why is this Special Rule Necessary?

Associated enterprises often settle transactions after long intervals because they belong to the same corporate group.

If GST liability depended only on the payment date, tax payment could be delayed indefinitely.

Therefore, GST law considers the book entry date as an alternative trigger for determining the Time of Supply.

This ensures:

• Timely payment of GST
• Uniform tax compliance
• Prevention of tax deferral
• Proper reporting of cross-border transactions

 

Practical Example 1

ABC India Pvt. Ltd. receives management consultancy services from its parent company located in Germany.

Particulars	Date
Service Provided	5 July 2026
Book Entry Passed	15 July 2026
Payment Made	25 August 2026

Comparison:

• Book Entry = 15 July 2026
• Payment Date = 25 August 2026

Time of Supply = 15 July 2026

GST liability arises on 15 July 2026 because the accounting entry was made before payment.

 

Practical Example 2

XYZ India Ltd. receives technical support services from its associated enterprise in Singapore.

Particulars	Date
Service Received	10 September 2026
Payment Made	18 September 2026
Book Entry Passed	30 September 2026

Comparison:

• Payment Date = 18 September 2026
• Book Entry = 30 September 2026

Time of Supply = 18 September 2026

GST becomes payable on 18 September 2026.

 

Practical Example 3

An Indian subsidiary receives software licensing services from its foreign holding company.

Particulars	Date
Invoice Date	1 October 2026
Book Entry Passed	8 October 2026
Payment Made	15 December 2026

Comparison:

• Book Entry = 8 October 2026
• Payment = 15 December 2026

Time of Supply = 8 October 2026

Although payment is made much later, GST liability arises on the earlier book entry date.

 

Comparative Table

Particulars	Normal Services	Services from Associated Enterprise
Governing Section	Section 13	Section 13 (Special Provision)
Time of Supply	Earlier of Invoice Date or Payment Date (subject to conditions)	Earlier of Payment Date or Book Entry Date
Book Entry Considered	Generally, no	Yes
Purpose	Ordinary service transactions	Cross-border transactions between associated enterprises

 

Important Points to Remember

• This special provision applies only to services.
• It generally covers services received from an Associated Enterprise located outside India.
• The invoice date is not the determining factor under this provision.
• The Time of Supply is the earlier of:
• Date of payment, or
• Date of entry in the recipient's books of account.
• The purpose of this rule is to prevent postponement of GST liability in transactions between related entities.

 

Exam Tips

• Remember the keyword "Associated Enterprise = Payment or Book Entry (Earlier)."
• Do not apply the normal service rule of Invoice Date or Payment Date in these cases.
• Questions in CA, CMA, CS, and GST examinations frequently test this special provision because it is an exception to the general rule.

Key Points

• A special Time of Supply rule applies to services received from an Associated Enterprise located outside India.
• The Time of Supply is the earlier of the Date of Payment or the Date of Entry in the Recipient's Books of Account.
• This provision ensures timely GST payment and prevents tax deferment in transactions between related entities.
• Businesses dealing with multinational group companies should carefully apply this rule to remain compliant with the GST provisions.

Time of Supply for Vouchers and Coupons

Vouchers and coupons are widely used in modern business to promote sales, reward customers, and facilitate advance purchases. They are commonly issued by shopping malls, restaurants, hotels, e-commerce platforms, supermarkets, airlines, and retail stores. Since a voucher may be redeemed immediately or at a future date, the GST law provides special provisions to determine the Time of Supply.

Unlike ordinary sales transactions, the taxable event for vouchers depends on whether the goods or services to be supplied are identifiable at the time of issue or identified only at the time of redemption.

The provisions relating to the Time of Supply for vouchers are contained in Section 12 (Goods) and Section 13 (Services) of the CGST Act, 2017. Both sections prescribe identical rules for vouchers and coupons.

 

What is a Voucher?

A voucher is an instrument that entitles the holder to receive specified goods or services or to receive goods or services up to a specified value.

Examples include:

• Gift vouchers
• Gift cards
• Meal coupons
• Shopping coupons
• Restaurant vouchers
• Hotel stay vouchers
• Spa vouchers
• Movie coupons
• Airline travel vouchers

 

Legal Provision

The GST law classifies vouchers into two categories:

1. Voucher for a Specific Supply

Where the goods or services to be supplied are clearly identifiable at the time of issuing the voucher, the Time of Supply shall be the date of issue of the voucher.

Formula

Specific Supply Voucher

Time of Supply = Date of Issue of Voucher

 

Example 1

A restaurant issues a voucher that can be redeemed only for a buffet dinner.

Particulars	Date
Voucher Issued	10 July 2026
Voucher Redeemed	20 August 2026

Since the voucher can be used only for one specific service (buffet dinner),

Time of Supply = 10 July 2026

GST liability arises on the date of issue of the voucher.

 

 

Example 2

A cinema issues a coupon that can be redeemed only for one movie ticket.

Particulars	Date
Coupon Issued	15 September 2026
Coupon Used	25 October 2026

The supply is known at the time of issue.

Time of Supply = 15 September 2026

 

2. Voucher for Multiple Supplies

Where the voucher can be redeemed against multiple goods or services, and the exact supply is not identifiable at the time of issue, the Time of Supply shall be the date of redemption of the voucher.

Formula

Multiple Supply Voucher

Time of Supply = Date of Redemption

 

Example 3

ABC Mall issues a ₹5,000 Gift Card.

The customer may purchase:

• Clothing
• Shoes
• Electronics
• Cosmetics
• Home appliances

The customer redeems the gift card after two months.

Particulars	Date
Voucher Issued	5 August 2026
Voucher Redeemed	10 October 2026

Since the exact goods were not known when the voucher was issued,

Time of Supply = 10 October 2026

GST liability arises only upon redemption.

 

Example 4

An online shopping platform issues a ₹2,000 gift voucher.

The customer can use it to buy any eligible product available on the website.

Particulars	Date
Voucher Issued	1 November 2026
Voucher Redeemed	15 December 2026

The specific goods were not identifiable at the time of issue.

Therefore,

Time of Supply = 15 December 2026

 

Difference Between Specific and Multiple Supply Vouchers

Particulars	Specific Supply Voucher	Multiple Supply Voucher
Supply Identified at Issue?	Yes	No
Time of Supply	Date of Issue	Date of Redemption
GST Liability	On issue of voucher	On redemption of voucher
Example	Buffet coupon, Movie ticket voucher	Gift card, Shopping voucher

 

Practical Illustrations

Illustration 1 – Specific Supply

ABC Spa issues a voucher for a 60-minute massage session.

Particulars	Date
Voucher Issued	5 January 2027
Service Availed	15 February 2027

Since the service is predetermined,

Time of Supply = 5 January 2027

 

Illustration 2 – Multiple Supply

XYZ Department Store issues a ₹10,000 Gift Card.

The customer can purchase any product available in the store.

Particulars	Date
Gift Card Issued	8 January 2027
Redeemed	20 March 2027

The actual supply becomes known only at redemption.

Time of Supply = 20 March 2027

 

Important Points to Remember

• The rules for vouchers are the same for both goods and services.
• If the supply is specifically identifiable at the time of issue, GST liability arises on the date of issue.
• If the voucher can be redeemed against multiple goods or services, GST liability arises on the date of redemption.
• The determining factor is whether the underlying supply is known at the time the voucher is issued, not merely the value of the voucher.

 

Exam Tips

• Remember the simple rule:
• Specific Supply → Issue Date
• Multiple Supplies → Redemption Date
• Questions often test whether the voucher is restricted to a single product/service or can be used for various products/services.
• Do not confuse the date of issue with the date of redemption; first determine whether the supply is identifiable.

Key Points

• The GST law provides special Time of Supply rules for vouchers and coupons under Sections 12 and 13.
• Specific Supply Voucher: Time of Supply is the date of issue because the goods or services are identifiable when the voucher is issued.
• Multiple Supply Voucher: Time of Supply is the date of redemption because the exact goods or services are identified only when the voucher is redeemed.
• Correct classification of vouchers ensures proper determination of GST liability and accurate compliance with the CGST Act, 2017.

Residuary Provisions

The GST law provides detailed rules for determining the Time of Supply for most transactions involving goods and services. However, there may be exceptional situations where the normal provisions cannot determine the exact date on which GST becomes payable. To address such cases, the CGST Act, 2017 contains Residuary Provisions.

The purpose of the residuary provisions is to ensure that every taxable transaction has a definite Time of Supply, even if it does not fit within the normal rules prescribed under Sections 12 and 13.

These provisions prevent uncertainty, tax avoidance, and disputes regarding the timing of GST liability.

 

What are Residuary Provisions?

Residuary Provisions are the fallback rules used when the Time of Supply cannot be determined under the normal provisions of the GST law.

In other words, when none of the prescribed events—such as invoice date, payment date, receipt of goods, or completion of service—can determine the Time of Supply, the GST law applies a separate rule to identify the taxable event.

 

Legal Provision

As per the Time of Supply provisions under the CGST Act:

• If the Time of Supply cannot be determined under the normal provisions of Section 12 (Goods) or Section 13 (Services), the Residuary Provision will apply.

The law prescribes different residuary rules depending upon the nature of the situation.

 

A. Residuary Provision for Goods and Services

Where the Time of Supply cannot be determined by applying the normal provisions, the Time of Supply shall be:

• The due date for filing the GST return, if a return is required to be filed; or
• The actual date of payment of GST, where no return is required to be filed.

Formula

Time of Supply =

• Due Date of GST Return, or
• Date of Payment of GST

(whichever provision is applicable in the particular case).

 

Practical Example 1

A taxable transaction is identified during departmental scrutiny, but the normal provisions cannot determine the Time of Supply.

Particulars	Date
Transaction Detected	15 September 2026
Return Due Date	20 October 2026
GST Paid	18 October 2026

Since the return is required to be filed,

Time of Supply = Due Date of Return (20 October 2026)

 

Practical Example 2

A person becomes liable to pay GST due to an assessment order where no regular GST return is required for that transaction.

Particulars	Date
Assessment Order	10 November 2026
GST Paid	25 November 2026

Since no return is applicable,

Time of Supply = 25 November 2026

 

Residuary Provision under Reverse Charge

Under Reverse Charge Mechanism (RCM), separate fallback provisions are available.

If the Time of Supply cannot be determined using:

• Payment date,
• 31st day (Goods),
• 61st day (Services), or
• Receipt of goods (for goods),

then the date of entry in the books of account of the recipient becomes the Time of Supply.

 

Practical Example 3

ABC Ltd. receives services under Reverse Charge.

The supplier's invoice date and payment details cannot be established.

The company records the transaction in its books on 12 December 2026.

Particulars	Date
Book Entry	12 December 2026

Since the normal rules cannot determine the Time of Supply,

Time of Supply = 12 December 2026

 

Situations Where Residuary Provisions May Apply

Residuary provisions may become relevant in situations such as:

• Search and seizure cases
• Transactions detected during GST audits
• Assessment proceedings
• Cases involving incomplete documentation
• Exceptional transactions where the normal Time of Supply rules cannot be applied
• Other circumstances specifically covered by GST law.

 

Comparative Table

Particulars	Normal Provision	Residuary Provision
Purpose	Determines Time of Supply using invoice, payment, receipt, etc.	Applies when the normal provisions fail
Goods	Section 12	Due date of return or date of payment (as applicable)
Services	Section 13	Due date of return or date of payment (as applicable)
Reverse Charge	Payment, 31st/61st day, receipt of goods	Date of entry in recipient's books

 

Important Points to Remember

• Residuary provisions are fallback rules and apply only when the normal Time of Supply provisions cannot determine the taxable event.
• They ensure that every taxable transaction has a definite Time of Supply.
• Under normal cases, the Time of Supply is determined using invoice dates, payment dates, completion of service, or receipt of goods.
• Under Reverse Charge, if these rules fail, the date of entry in the recipient's books of account becomes the Time of Supply.
• Residuary provisions help avoid uncertainty and ensure proper GST compliance.

 

Exam Tips

• Remember that Residuary Provisions are used only as a last resort.
• For general cases, think of:
• Due Date of GST Return, or
• Date of Payment of GST, depending on the applicable situation.
• For Reverse Charge, remember the special fallback rule:
• Date of Entry in the Recipient's Books of Account.
• Questions often ask candidates to distinguish between the normal Time of Supply provisions and the residuary provisions.

Key Points

• Residuary provisions ensure that GST liability can be determined even when the normal Time of Supply rules are not applicable.
• For general situations, the Time of Supply is the due date for filing the GST return or the date of payment of GST, as applicable.
• Under Reverse Charge, where the normal criteria fail, the date of entry in the recipient's books of account is treated as the Time of Supply.
• These provisions eliminate ambiguity and ensure complete compliance with the Time of Supply provisions under the CGST Act, 2017.

Interest, Late Fee and Penalty

In the normal course of business, a supplier or recipient may receive additional amounts such as interest, late fee, or penalty due to delayed payment by the customer. Since these amounts are directly connected with the original taxable supply, the GST law provides a separate rule for determining the Time of Supply.

Unlike the normal provisions where the Time of Supply depends upon the invoice date or payment date, GST on interest, late fee, or penalty for delayed payment becomes payable only when the additional amount is actually received.

This special provision applies to both the supply of goods and the supply of services under the CGST Act, 2017.

 

Legal Provision

As per Section 12 (Goods) and Section 13 (Services) of the CGST Act, where the supplier receives interest, late fee, or penalty for delayed payment of consideration, the Time of Supply in respect of such additional amount shall be:

The date on which the supplier actually receives the additional amount.

 

Formula

Time of Supply = Date of Actual Receipt of Interest, Late Fee, or Penalty

The invoice date, due date, or the period of delay is not relevant for determining the Time of Supply of these additional charges.

 

Why is this Special Provision Required?

Interest, late fee, and penalty are generally uncertain at the time of the original supply because:

• The customer may make payment on time.
• The amount of delay cannot always be predicted.
• The exact amount of interest or penalty becomes known only after the payment is delayed.

Therefore, GST is payable only when these additional charges are actually received by the supplier.

 

Interest on Delayed Payment

Interest is charged when the customer fails to make payment within the agreed credit period.

Practical Example 1

ABC Traders sold machinery for ₹5,00,000.

Payment was due within 30 days.

The customer paid after 60 days along with ₹5,000 as interest.

Particulars	Date
Invoice Issued	10 July 2026
Payment Due	9 August 2026
Interest Received	15 September 2026

The Time of Supply for the interest amount is:

15 September 2026

GST on ₹5,000 becomes payable on the date the interest is actually received.

 

Late Fee

A late fee may be charged when the customer delays payment beyond the agreed period.

Practical Example 2

XYZ Consultants issued an invoice for ₹1,20,000.

The customer paid the amount after the due date along with a late fee of ₹2,000.

Particulars	Date
Invoice Date	5 August 2026
Late Fee Received	25 September 2026

The Time of Supply for the late fee is:

25 September 2026

GST liability on the late fee arises only upon its actual receipt.

 

Penalty

A penalty may be charged for breach of contractual terms, delayed payment, or other specified defaults.

Practical Example 3

ABC Logistics supplies transportation services.

The customer delays payment and pays a penalty of ₹10,000.

Particulars	Date
Invoice Issued	1 October 2026
Penalty Received	20 December 2026

The Time of Supply for the penalty amount is:

20 December 2026

GST becomes payable only when the penalty is actually received.

 

 

Combined Illustration

A supplier receives different additional charges from the same customer.

Particulars	Amount	Date Received	Time of Supply
Interest	₹3,000	10 January 2027	10 January 2027
Late Fee	₹1,000	18 January 2027	18 January 2027
Penalty	₹5,000	25 January 2027	25 January 2027

Each amount has a separate Time of Supply, based on the actual date of receipt.

 

Applicability to Goods and Services

Particulars	Goods	Services
Interest	Date of Actual Receipt	Date of Actual Receipt
Late Fee	Date of Actual Receipt	Date of Actual Receipt
Penalty	Date of Actual Receipt	Date of Actual Receipt
Relevant Section	Section 12	Section 13

The rule is identical for both goods and services.

 

Difference Between Normal Supply and Additional Charges

Particulars	Normal Supply	Interest / Late Fee / Penalty
Time of Supply	Determined by invoice date, payment date, or other applicable provisions	Date of Actual Receipt
GST Liability	Arises as per Sections 12 or 13	Arises only upon actual receipt of the additional amount
Reason	Taxable supply already exists	Additional consideration arises due to delayed payment

 

Important Points to Remember

• The rule applies to interest, late fee, and penalty arising due to delayed payment of consideration.
• GST on these additional amounts becomes payable only on the date they are actually received.
• The invoice date or the due date of payment does not determine the Time of Supply for these additional charges.
• The same rule applies to both goods and services under the GST law.

 

Exam Tips

• Remember the simple rule:

Interest + Late Fee + Penalty = Date of Actual Receipt

• Do not confuse this provision with the normal Time of Supply rules under Forward Charge or Reverse Charge.
• In examination questions, always determine whether the additional amount has actually been received before fixing the Time of Supply.

Key Points

• Interest, late fee, and penalty charged for delayed payment are treated as additional consideration under GST.
• The Time of Supply for these amounts is the date of their actual receipt, irrespective of the invoice date or due date.
• This rule applies equally to goods and services under Sections 12 and 13 of the CGST Act, 2017.
• Proper application of this provision ensures accurate GST payment and avoids disputes regarding delayed collections.

Summary Table – Goods vs Services

After understanding the various provisions relating to the Time of Supply, it is useful to compare the rules applicable to the supply of goods and the supply of services. Although the fundamental objective of Sections 12 and 13 of the CGST Act, 2017 is the same—to determine the exact point at which GST liability arises—certain provisions differ because of the nature of goods and services.

The following comparative tables provide a quick reference for students, professionals, accountants, and GST practitioners. These tables are especially useful for examination revision and day-to-day GST compliance.

 

A. Comparison – Time of Supply of Goods vs Services

Particulars	Goods (Section 12)	Services (Section 13)
Governing Section	Section 12	Section 13
Applicable To	Supply of Goods	Supply of Services
Person Liable under Forward Charge	Supplier	Supplier
Person Liable under Reverse Charge	Recipient	Recipient
Objective	Determine GST liability for goods	Determine GST liability for services

 

B. Forward Charge Mechanism (FCM)

Situation	Goods	Services
Invoice issued within prescribed time	Earlier of Invoice Date or Payment Date	Earlier of Invoice Date or Payment Date
Invoice not issued within prescribed time	Earlier of Last Date for Issuing Invoice or Payment Date	Earlier of Completion of Service or Payment Date

 

C. Reverse Charge Mechanism (RCM)

Particulars	Goods	Services
First Criterion	Date of Payment	Date of Payment
Second Criterion	31st Day from Supplier's Invoice	61st Day from Supplier's Invoice
Third Criterion	Date of Receipt of Goods	Not Applicable
Residuary Rule	Date of Entry in Recipient's Books	Date of Entry in Recipient's Books

 

D. Advance Payments

Particulars	Goods	Services
Advance Received	GST generally payable when the invoice is issued (subject to applicable provisions)	Earlier of Invoice Date or Date of Receipt of Payment
₹1,000 Excess Advance (Chiller Advance)	Two options available	Two options available

 

E. Associated Enterprises

Particulars	Goods	Services
Special Provision Available	No specific provision	Earlier of Payment Date or Book Entry Date
Applicable To	Not specifically applicable	Services received from Associated Enterprises located outside India

 

F. Vouchers and Coupons

Particulars	Goods	Services
Specific Supply Voucher	Date of Issue	Date of Issue
Multiple Supply Voucher	Date of Redemption	Date of Redemption

 

G. Interest, Late Fee and Penalty

Particulars	Goods	Services
Time of Supply	Date of Actual Receipt	Date of Actual Receipt
Applicable Provision	Section 12	Section 13

 

H. Residuary Provisions

Particulars	Goods	Services
General Residuary Rule	Due Date of GST Return or Date of Payment of GST (as applicable)	Due Date of GST Return or Date of Payment of GST (as applicable)
Reverse Charge Fallback Rule	Date of Entry in Recipient's Books	Date of Entry in Recipient's Books

 

I. Complete Comparison at a Glance

Particulars	Goods	Services
Governing Section	Section 12	Section 13
Invoice Issued Within Time	Earlier of Invoice Date or Payment Date	Earlier of Invoice Date or Payment Date
Invoice Not Issued Within Time	Earlier of Last Date for Invoice or Payment Date	Earlier of Completion of Service or Payment Date
Reverse Charge	Payment / 31st Day / Receipt of Goods	Payment / 61st Day
Advance Payment	GST generally payable on invoice (subject to applicable provisions)	Earlier of Invoice Date or Advance Receipt
Associated Enterprises	Not specifically covered	Earlier of Payment or Book Entry
Vouchers (Specific Supply)	Date of Issue	Date of Issue
Vouchers (Multiple Supplies)	Date of Redemption	Date of Redemption
Interest / Late Fee / Penalty	Date of Actual Receipt	Date of Actual Receipt
Residuary Provision	Due Date of Return or Date of GST Payment (as applicable)	Due Date of Return or Date of GST Payment (as applicable)

 

Quick Revision Chart

Topic	Goods	Services
Forward Charge	Invoice/Payment	Invoice/Payment
Delayed Invoice	Last Date for Invoice	Completion of Service
Reverse Charge	Payment + 31 Days + Receipt	Payment + 61 Days
Associated Enterprise	No	Payment or Book Entry
Voucher (Specific)	Issue Date	Issue Date
Voucher (Multiple)	Redemption Date	Redemption Date
Interest / Penalty	Actual Receipt	Actual Receipt

 

Memory Trick for Exams

Topic	Easy Memory Rule
Goods (FCM)	Invoice or Payment
Services (FCM)	Invoice or Payment
Goods (Delayed Invoice)	Last Invoice Date
Services (Delayed Invoice)	Completion Date
Goods (RCM)	Payment + 31 Days + Receipt
Services (RCM)	Payment + 61 Days
Associated Enterprise	Payment or Book Entry
Voucher (Specific)	Issue Date
Voucher (Multiple)	Redemption Date
Interest/Late Fee/Penalty	Actual Receipt

 

Key Points

• Section 12 governs the Time of Supply of Goods, while Section 13 governs the Time of Supply of Services.
• The general rule for both goods and services under Forward Charge is the earlier of the Invoice Date or Payment Date, subject to the specific provisions where invoices are not issued within the prescribed time.
• The Reverse Charge Mechanism, Associated Enterprises, Vouchers, Interest/Late Fee/Penalty, and Residuary Provisions each have separate rules that must be applied carefully.
• Understanding these comparative provisions enables taxpayers to determine the correct Time of Supply, ensure timely GST payment, and avoid interest, penalties, and compliance issues.

Important Notes & Exam Tips

The Time of Supply provisions are among the most frequently tested topics in CA, CMA, CS, GST Practitioner, B.Com, M.Com, MBA, and departmental examinations. Since GST liability depends upon the correct determination of the Time of Supply, every taxpayer and student should understand these provisions thoroughly.

The following notes and exam tips will help you revise the chapter quickly and avoid common mistakes.

 

Important Notes

1. Separate Sections Apply to Goods and Services

• Section 12 governs the Time of Supply of Goods.
• Section 13 governs the Time of Supply of Services.

 

2. Time of Supply Determines GST Liability

The Time of Supply determines:

• The exact date on which GST becomes payable.
• The GST return in which the transaction should be reported.
• The applicable GST rate.
• Interest liability in case of delayed payment.

 

3. Goods vs Services

Goods	Services
Governed by Section 12	Governed by Section 13
Delayed Invoice → Last Date for Issuing Invoice	Delayed Invoice → Completion of Service

 

4. Forward Charge Rule

When the supplier is liable to pay GST:

Goods

Earlier of:

• Invoice Date
• Payment Date

Services

Earlier of:

• Invoice Date
• Payment Date

(Subject to the special rules where invoices are not issued within the prescribed time.)

 

5. Reverse Charge Rule

Remember the following numbers:

• Goods → 31 Days
• Services → 61 Days

Goods under RCM:

Earlier of:

• Payment
• 31st Day
• Receipt of Goods

Services under RCM:

Earlier of:

• Payment
• 61st Day

 

6. Associated Enterprises

Only applicable to specified services received from an Associated Enterprise located outside India.

Remember:

Earlier of

• Payment Date
• Book Entry Date

 

7. Vouchers

Specific Supply

→ Issue Date

Multiple Supplies

→ Redemption Date

 

8. Interest, Late Fee & Penalty

GST becomes payable only when the amount is actually received.

 

9. Chiller Advance (₹1,000)

Where excess money (up to ₹1,000) is received:

Supplier has two options:

• Pay GST immediately, or
• Pay GST when adjusted in the next invoice.

 

Common Mistakes to Avoid

·         Confusing Goods provisions with Services provisions.

·         Using Actual Invoice Date instead of Last Date of Invoice (Goods).

·         Forgetting the 31-day and 61-day rules under Reverse Charge.

·         Applying the normal service rule to Associated Enterprises.

·         Treating voucher redemption as the Time of Supply for every voucher.

·         Ignoring the book entry rule under Reverse Charge.

 

Memory Tricks

Topic	Easy Trick
Goods FCM	Invoice OR Payment
Services FCM	Invoice OR Payment
Goods Delayed Invoice	Last Invoice Date
Services Delayed Invoice	Completion Date
Goods RCM	Payment + 31 + Receipt
Services RCM	Payment + 61
Associated Enterprise	Payment OR Book Entry
Voucher (Specific)	Issue Date
Voucher (Multiple)	Redemption
Interest / Penalty	Actual Receipt

 

Examination Tips

• Always identify whether the transaction relates to Goods or Services.
• Determine whether Forward Charge or Reverse Charge applies.
• Check whether the invoice has been issued within the prescribed time.
• Compare the required dates carefully and select the earliest applicable date.
• Read GST examination questions carefully, as a small change in dates can change the Time of Supply.

 

Quick Revision Chart

Forward Charge

Goods → Invoice / Payment

Services → Invoice / Payment

Reverse Charge

Goods → Payment / 31 Days / Receipt

Services → Payment / 61 Days

Associated Enterprise

Payment / Book Entry

Voucher

Specific → Issue

Multiple → Redemption

Interest

Actual Receipt

 

Final Exam Tip

Whenever a Time of Supply question appears in an examination, solve it in this order:

1. Identify Goods or Services.
2. Check whether FCM or RCM applies.
3. Determine whether the invoice is issued within the prescribed time.
4. Compare the relevant dates.
5. Select the earliest applicable date.
6. Mention the applicable section in your answer for higher marks.

Conclusion
The Time of Supply is one of the most fundamental concepts under the Goods and Services Tax (GST) regime because it determines the exact point at which GST liability arises. Every registered taxpayer, accountant, tax consultant, and business owner must understand these provisions to ensure timely tax payment, accurate return filing, and full compliance with the GST law. Throughout this chapter, we examined the provisions of Section 12 relating to the Time of Supply of Goods and Section 13 relating to the Time of Supply of Services. We discussed the rules applicable under the Forward Charge Mechanism, Reverse Charge Mechanism, treatment of advance payments, Associated Enterprises, vouchers and coupons, interest, late fee and penalty, and the residuary provisions, supported by practical examples and comparison tables. Understanding the correct Time of Supply not only helps determine the applicable GST rate and tax period but also protects businesses from unnecessary interest, penalties, litigation, and compliance issues. By carefully comparing the relevant dates and applying the correct legal provision, taxpayers can accurately determine when GST becomes payable. As GST law continues to evolve, businesses should regularly review statutory amendments, notifications, and circulars issued by the Government to remain compliant. A strong understanding of the Time of Supply provisions forms the foundation for efficient GST compliance and professional tax management.