Section 12 of the Central Goods and Services Tax (CGST) Act, 2017 deals with the time of supply of goods. It is an important provision because the time of supply determines the point at which the liability to pay GST arises on a supply of goods.
In simple words, the time of supply helps determine when a transaction becomes liable to GST and in which tax period the supplier is required to account for the tax.
Section 12 contains different rules for normal supplies of goods, supplies where GST is payable under the Reverse Charge Mechanism (RCM), situations where the time of supply cannot otherwise be determined, and additions to the value of supply in the form of interest, late fee or penalty.
The current text of Section 12 also reflects the removal of the separate voucher provision with effect from 1 October 2025.
What is the Time of Supply of Goods?
The time of supply is the point in time at which the liability to pay GST arises under the applicable provisions.
Section 12(1) states that the liability to pay tax on goods arises at the time of supply, as determined according to Section 12.
This makes the provision important for determining:
- When GST liability arises
- The relevant tax period
- The applicable rate in situations involving a change in tax rate
- The timing of tax payment
- The period in which the supply is reported
The time of supply provisions should therefore be read along with other provisions of the CGST Act, particularly the provisions relating to tax invoices and changes in tax rates.
Section 12(1) – Liability to Pay Tax
Section 12(1) provides the basic rule for the time of supply of goods.
It states that the liability to pay tax on goods arises at the time of supply, as determined under Section 12.
Therefore, Section 12 does not merely provide an accounting date. It establishes the statutory point at which the GST liability arises.
For example, if a taxable supply of goods takes place and the applicable time of supply falls in a particular month, the supplier needs to consider that GST liability in the relevant tax period.
Section 12(2) – Time of Supply for Normal Supply of Goods
Section 12(2) provides the general rule for determining the time of supply of goods.
For a normal taxable supply, the time of supply is the earlier of the following:
- The date of issue of the invoice by the supplier or the last date on which the supplier is required to issue the invoice under Section 31; or
- The date on which the supplier receives payment for the supply.
The wording of Section 12 therefore uses the concept of the earlier date.
Example
Suppose a supplier is required to issue an invoice for goods by 10 April.
The supplier issues the invoice on 8 April and receives payment on 15 April.
The relevant dates are:
- Invoice date: 8 April
- Payment date: 15 April
The earlier date is 8 April.
Therefore, subject to the applicable provisions, 8 April becomes the time of supply.
Date of Invoice or Last Date for Issuing Invoice
Section 12(2)(a) does not simply refer to the actual invoice date.
It refers to:
- The date on which the supplier issues the invoice, or
- The last date on which the supplier is required to issue the invoice under Section 31,
whichever is relevant under the provision.
This is important because GST law prescribes specific timelines for issuing invoices for supplies of goods.
Therefore, if an invoice is not issued within the prescribed period, the statutory last date for issuing the invoice becomes relevant when determining the time of supply.
Date of Receipt of Payment
Section 12(2)(b) also refers to the date on which the supplier receives payment for the supply.
Section 12 contains an explanation regarding the meaning of the date on which payment is received.
For this purpose, the relevant date is the earlier of:
- The date on which the payment is entered in the supplier’s books of account, or
- The date on which the payment is credited to the supplier’s bank account.
This rule is specifically provided in Explanation 2 to Section 12(2).
Example
Suppose:
- Payment is credited to the supplier’s bank account on 12 June.
- The supplier records the payment in its books on 15 June.
The earlier date is 12 June.
Therefore, for the purpose of Section 12(2)(b), the date of receipt of payment would be 12 June.
Important Point About Advance Payment for Goods
The wording of Section 12(2) includes the date of receipt of payment. However, taxpayers should also consider the notifications issued under the GST law regarding advances received for supplies of goods.
Notification No. 66/2017-Central Tax provides relief from payment of tax on advances received in respect of supplies of goods for specified taxpayers, with the composition taxpayer position being treated differently.
Therefore, the statutory wording of Section 12(2) and the applicable notification should be read together when dealing with advances for goods.
The CBIC’s GST material also explains that the receipt-of-payment trigger is not generally applied to advances for goods under the notified relief.
This distinction is important because simply reading Section 12(2) without considering the applicable notification can lead to an incorrect understanding of GST liability on advances.
₹1,000 Excess Payment Provision
Section 12(2) contains a special proviso concerning an amount received by the supplier in excess of the amount indicated in the tax invoice.
Where the supplier of taxable goods receives an amount up to ₹1,000 in excess of the amount indicated in the tax invoice, the supplier has the option to treat the date of issue of the invoice for that excess amount as the time of supply to the extent of such excess amount.
This provision deals specifically with the excess amount and provides an option to the supplier.
Example
Suppose the tax invoice shows an amount of ₹20,000, but the supplier receives ₹20,500.
The additional ₹500 falls within the ₹1,000 limit specified in the proviso.
In such a situation, the supplier may exercise the option provided by Section 12(2) for determining the time of supply relating to the excess amount.
Explanation 1 to Section 12(2)
Explanation 1 provides that, for the purposes of clauses (a) and (b), the supply is deemed to have been made to the extent covered by:
- The invoice, or
- The payment, as applicable.
This provision becomes relevant where the invoice or payment covers only part of the supply.
It helps determine the extent to which the supply is treated as having taken place for the purpose of determining the time of supply.
Section 12(3) – Time of Supply Under Reverse Charge
Section 12(3) deals with supplies of goods where tax is paid or is liable to be paid under the Reverse Charge Mechanism.
Under reverse charge, the recipient rather than the supplier is responsible for paying GST in the cases covered by the applicable provisions.
For such supplies, the time of supply is the earliest of the following dates:
- The date of receipt of goods;
- The date of payment as entered in the recipient’s books of account or the date on which payment is debited from the recipient’s bank account, whichever is earlier; or
- The date immediately following 30 days from the date of issue of the invoice or other relevant document by the supplier.
These rules are specifically provided under Section 12(3).
Example of Time of Supply Under Reverse Charge
Suppose a recipient receives goods on 5 July.
The recipient makes payment on 15 July and records the payment in its books on the same date.
The supplier issued the invoice on 20 June.
The relevant dates are:
- Receipt of goods: 5 July
- Payment: 15 July
- Thirty days from invoice: 20 July
- Date immediately following 30 days: 21 July
The earliest of these dates is 5 July.
Therefore, 5 July would be the time of supply under Section 12(3).
30-Day Rule Under Reverse Charge
The 30-day rule is particularly important for reverse-charge supplies of goods.
Where tax is payable under reverse charge, the time of supply can be determined by reference to the date immediately following 30 days from the date of issue of the supplier’s invoice or other relevant document.
Therefore, businesses receiving goods under reverse charge should maintain proper records of:
- Invoice date
- Receipt date
- Payment date
- Book entry date
- Bank debit date
This helps determine the correct time of supply.
What Happens If the Time of Supply Cannot Be Determined Under Section 12(3)?
Section 12(3) contains a proviso for situations where the time of supply cannot be determined using the specified dates.
If it is not possible to determine the time of supply under:
- Clause (a),
- Clause (b), or
- Clause (c),
the time of supply becomes the date of entry in the books of account of the recipient of the supply.
This acts as a further mechanism for determining the time of supply in reverse-charge situations.
Section 12(4) – Supply of Vouchers
Section 12 previously contained a specific provision dealing with the time of supply of vouchers.
However, this provision has been omitted with effect from 1 October 2025 by the Finance (No. 7) Act, 2025. CBIC’s current Section 12 text specifically records the omission.
Therefore, current articles discussing Section 12 should not present the old Section 12(4) voucher rule as an operative provision.
This is an important update for anyone studying the current CGST Act.
Section 12(5) – Residual Rule
Section 12(5) provides a residual mechanism.
If the time of supply cannot be determined under the relevant provisions of Section 12, the time of supply is determined as follows:
Where a Periodical Return Has to Be Filed
The time of supply is the date on which the return is required to be filed.
In Other Cases
The time of supply is the date on which the tax is paid.
This provision acts as a fallback mechanism where the normal rules do not allow the time of supply to be determined.
Section 12(6) – Interest, Late Fee or Penalty
Section 12(6) deals with an addition to the value of supply in the form of:
- Interest
- Late fee
- Penalty
where the addition relates to delayed payment of consideration.
The time of supply for such addition in value is the date on which the supplier receives the addition in value.
Example
Suppose a customer pays the principal amount for goods but makes the payment late.
Under the terms of the transaction, the supplier receives an additional amount as interest for the delayed payment.
The time of supply relating to that addition in value is the date on which the supplier receives that additional amount.
This is specifically provided under Section 12(6).
Difference Between Section 12 and Section 13
Section 12 and Section 13 both deal with the time of supply, but they apply to different types of supplies.
| Provision | Subject |
|---|---|
| Section 12 | Time of supply of goods |
| Section 13 | Time of supply of services |
| Section 14 | Change in rate of tax in respect of goods or services |
Therefore, when determining the time at which GST liability arises, the first step is to identify whether the transaction involves goods or services and then apply the relevant provision.
Why Is Time of Supply Important?
Time of supply is important because GST is linked to the point at which the tax liability arises.
Correct determination of the time of supply helps a taxpayer:
- Determine the appropriate tax period
- Calculate GST liability correctly
- Report the transaction in the appropriate return
- Apply the relevant tax rate where required
- Determine the correct timing of tax payment
- Maintain proper accounting records
- Avoid interest and compliance-related issues
An incorrect determination can result in tax being reported in the wrong period.
Time of Supply and GST Invoice
The invoice date is an important factor in determining the time of supply of goods.
However, businesses should not assume that the invoice date is always the time of supply.
Section 12(2) requires comparison with the other applicable date, and the statutory invoice deadline under Section 31 can also become relevant.
Therefore, taxpayers should maintain proper records of:
- Date of supply
- Date of invoice
- Statutory invoice due date
- Date of receipt of payment
- Date payment is recorded in books
- Date payment is credited to bank account
These records can be useful for correctly determining the time of supply.
Time of Supply in Continuous Supply of Goods
Special invoice provisions can apply to continuous supply of goods.
Section 31 contains specific rules regarding invoice issuance in such cases. For example, where successive statements of accounts or successive payments are involved, the invoice is required to be issued before or at the time of the relevant statement or payment, as applicable.
Since Section 12(2) refers to the date of issue of invoice or the last date on which the invoice is required to be issued under Section 31, the invoice provisions are important when determining the time of supply for continuous supplies.
The exact treatment should therefore be determined by reading Section 12 together with the applicable provisions of Section 31.
Time of Supply When Goods Are Supplied Under Reverse Charge
Reverse charge requires particular attention because the normal supplier-based rule does not apply in the same way.
Under Section 12(3), the earliest of the specified dates determines the time of supply.
Therefore, a recipient liable to pay GST under reverse charge should track the date of:
- Receipt of goods
- Payment
- Entry of payment in books
- Debit of payment from bank account
- Supplier’s invoice
The earliest applicable date determines the time of supply, subject to the specific provisions of Section 12.
Practical Example of Normal Supply
Suppose a supplier sells goods worth ₹1,00,000.
The supplier issues the invoice on 10 August.
The supplier receives payment on 20 August.
The last date for issuing the invoice is also before or on 10 August, depending on the applicable invoice rules.
The relevant dates are:
- Invoice date: 10 August
- Payment date: 20 August
The earlier date is 10 August.
Therefore, the time of supply would generally be 10 August, subject to the applicable provisions.
Practical Example of Reverse Charge
Suppose:
- Goods received: 10 September
- Supplier invoice date: 1 September
- Payment recorded in books: 20 September
- Bank debit: 21 September
- Thirty days from invoice: 1 October
- Date immediately following 30 days: 2 October
The earliest relevant date is 10 September.
Therefore, the time of supply under Section 12(3) would generally be 10 September.
Important Points About Section 12
The major points of Section 12 of the CGST Act can be summarized as follows:
- Section 12 deals with the time of supply of goods.
- GST liability on goods arises at the time of supply as determined under Section 12.
- For normal supplies, Section 12(2) uses the earlier applicable date.
- The invoice date or the last legally prescribed invoice date can be relevant.
- The date of receipt of payment is also included in Section 12(2).
- Explanation 2 determines the date of receipt of payment by comparing the books-of-account date and bank-credit date.
- A special proviso deals with an excess payment of up to ₹1,000 over the amount indicated in the tax invoice.
- Section 12(3) provides separate rules for reverse-charge supplies.
- Under reverse charge, the earliest of receipt of goods, payment-related date and the 30-day invoice-related date is relevant.
- If the time of supply cannot be determined under the specified reverse-charge dates, the recipient’s book-entry date can become relevant.
- Section 12(4), which previously dealt with vouchers, has been omitted with effect from 1 October 2025.
- Section 12(5) provides a residual rule where the time of supply cannot otherwise be determined.
- Section 12(6) deals with interest, late fee or penalty received for delayed payment of consideration.
- The time of supply for such additional value is the date on which the supplier receives that addition.
- Section 12 should be read along with Section 31 and other applicable GST provisions.
Conclusion
Section 12 of the CGST Act, 2017 is the main provision for determining the time of supply of goods. It establishes when the liability to pay GST arises and provides different rules depending on the nature of the transaction.
For normal supplies, the relevant dates under Section 12(2) have to be considered carefully. Supplies covered by the Reverse Charge Mechanism are governed by the specific rules in Section 12(3), while Section 12(5) provides a residual mechanism where the time of supply cannot otherwise be determined.
It is also important to consider current amendments. In particular, the earlier voucher provision under Section 12(4) was omitted with effect from 1 October 2025. Therefore, taxpayers and students should refer to the current version of the CGST Act rather than relying on older study material.
For accurate GST compliance, Section 12 should be read together with the applicable provisions of Section 31, relevant notifications and the GST Rules.
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