Taxation · Time of Supply

Time of Supply Special Cases: Vouchers, Interest, Late Fee and Residual Provisions

Updated 4 October 2026 · Fact-checked

Special cases of time of supply fix when GST becomes payable in situations the normal rules miss. A voucher is taxed on issue if the supply is identifiable, otherwise on redemption. Interest or late fee is taxed when received. Residual cases use the return due date or tax payment date. Section 14 governs rate changes.

Understand Special Cases: Vouchers, Interest, Late Fee, Residual Provisions

Time of supply decides the date on which GST liability arises. That date matters because it fixes the tax period in which you report the supply and the rate of tax that applies. The main rules in Sections 12 (goods) and 13 (services) work on invoice date, payment date, date of receipt of goods (under reverse charge) and so on. Some situations do not fit those rules. The law gives separate rules for them.

Vouchers. A voucher is an instrument that must be accepted as consideration or part consideration for a supply. If the goods or services it buys are identifiable when the voucher is issued (for example, a voucher for one specific product), time of supply is the date of issue. If they are not identifiable (a general gift card usable for anything), time of supply is the date of redemption. The same two-way rule applies to goods and to services.

Interest, late fee and penalty. Suppose a buyer pays late and the supplier charges extra for the delay. That extra amount increases the value of supply. Its time of supply is the date on which the supplier receives it. The original supply keeps its own time of supply. Only the extra amount is taxed on receipt.

Residual provision. If you cannot fix the time of supply under the normal rules, use a fall-back. Where a periodical return is to be filed, the time of supply is the due date of that return. In any other case, it is the date on which the tax is paid. For services, this is the residual provision in Section 13(4).

Associated enterprise outside India (separate rule). This is not part of the residual provision. It is a proviso to the reverse charge rule for services in Section 13(3). Where the supplier of services is an associated enterprise located outside India, the time of supply is the earlier of the date of entry in the recipient's books and the date of payment. It replaces the 60-day invoice limb of the reverse charge rule, and only under reverse charge.

Change in rate of tax (Section 14). When the rate changes between supply, invoice and payment, Section 14 applies notwithstanding Sections 12 and 13, but only where the rate change happens during the transaction. It looks at three events: when the supply was made, when the invoice was issued, and when payment was received. Payment date means the earlier of the date it is entered in the books and the date it is credited to the bank account. You then pick the time of supply from the six cases in the section and apply the rate in force on that date.

Key rules to remember

Vouchers: Supply identifiable at issue → date of issue of voucher; otherwise → date of redemption; Test only one thing: can you tell, from the voucher or related documents, which goods or services it buys? Yes means issue date. No means redemption date.
Interest, late fee, penalty for delayed payment: Time of supply of the extra amount = date supplier receives it; Applies only to the addition in value. The main supply is taxed on its own time of supply.
Residual provision: Periodical return required → due date of return; otherwise → date of payment of tax; Use it only when the normal rules cannot fix the time of supply. Do not use it as a shortcut.
Associated enterprise outside India (services, reverse charge): Earlier of: date of entry in recipient's books, date of payment; This is a separate rule, not part of the residual provision. It is a proviso to Section 13(3) and replaces the 60-day invoice limb only under reverse charge.
Change in rate: supply made BEFORE the change: Invoice and payment both after change → earlier of the two; invoice before, payment after → invoice date; payment before, invoice after → payment date; In effect, the new rate applies only when both invoice and payment fall after the change.
Change in rate: supply made AFTER the change: Invoice before, payment after → payment date; both before → earlier of the two; payment before, invoice after → invoice date; In effect, the old rate applies only when both invoice and payment fall before the change.
Date of receipt of payment (Section 14 and forward charge): Earlier of: date entered in books, date credited to bank account; Use this when a question gives both dates.

How to solve Special Cases: Vouchers, Interest, Late Fee, Residual Provisions questions

Use the same sequence for every question on special cases. It stops you from applying the wrong rule to the right facts.

1Identify the type of case: voucher, interest or late fee, associated enterprise, residual, or change in rate. Also note whether it is goods or services.
2List every date in the question in order: supply, invoice, payment, voucher issue, redemption, return due date, and the date of rate change.
3For a voucher, decide if the supply is identifiable at issue. Choose issue date or redemption date accordingly.
4For interest or late fee, split the amount. Fix the time of supply of the main supply first, then separately fix the date of receipt of the extra amount.
5For a rate change, mark which side of the change date each event falls on. Apply the correct one of the six Section 14 cases and read off the time of supply.
6State the rate in force on that time of supply and compute GST on the value.
7Write a clear conclusion giving the date, the rule used and the tax amount.

Quickest way: Rate change shortcut and MCQ elimination

When to use it: Use it for MCQs and for the first line of a written answer on Section 14 or voucher questions.

Draw a line on paper for the date of rate change and place supply, invoice and payment on it.
Supply BEFORE the change: old rate unless both invoice and payment are after the change. Supply AFTER the change: new rate unless both invoice and payment are before the change.
Where the events are split, the time of supply is the earlier event if the supply was before the change, and the later event if the supply was after the change. Check this against the section if time permits.
Voucher MCQ: look for words like 'any goods', 'any store' (redemption) or a named product (issue).
Interest MCQ: the answer is always the date of receipt of the interest, never the invoice date.
In the written answer, name the rule first, then show the dates, then the conclusion. Each of these usually earns a step mark.

Common mistakes in Special Cases: Vouchers, Interest, Late Fee, Residual Provisions

Taxing every voucher on the date of issue.
Students remember issue date as the main rule and forget the identifiability test.
Fix: Ask whether the goods or services are identifiable at issue. If not, tax on redemption.
Treating the interest for late payment as part of the original supply, taxed on the invoice date.
The interest is added to the value of supply, so it looks like the same supply.
Fix: Tax the main supply on its own date. Tax only the interest or late fee on the date the supplier receives it.
Using the residual provision when the normal rule already gives an answer.
The fall-back looks simple, so students reach for it.
Fix: Apply Section 12 or 13 first. Use the return due date or tax payment date only when the time of supply cannot otherwise be determined.
Mixing up the Section 14 cases and picking the earlier event when the later one is required.
Students memorise 'earlier of invoice or payment' and apply it to every case.
Fix: Place the events on the timeline. Use the earlier of the two only when both events are on the same side of the change, or when the supply was before the change and the events are split.
Using the bank credit date as the payment date when the entry in the books is earlier.
Students think payment means money in the bank.
Fix: Take the earlier of the date entered in the books and the date credited to the bank account.
Applying the associated enterprise rule to a domestic supplier.
The words 'associated enterprise' attract attention without checking the location.
Fix: Check that the supplier of services is located outside India and that the supply is under reverse charge.

Worked examples

Example 1

Alpha Retail Ltd. issues a gift voucher of ₹5,000 on 5 March 2027. Case A: the voucher is valid only for a specified branded laptop model. Case B: the voucher can be used for any goods in the store. In both cases the voucher is redeemed on 20 April 2027. Alpha also receives ₹300 as interest from a customer on 12 May 2027 on delayed payment of an earlier supply. State the time of supply in each case.

Show the solution

Case A: the supply (the specified laptop) is identifiable at the time of issue. So the time of supply is the date of issue of voucher: 5 March 2027.
Case B: the supply is not identifiable when the voucher is issued. So the time of supply is the date of redemption: 20 April 2027.
Interest of ₹300 is an addition in value for delayed payment. Its time of supply is the date the supplier receives it: 12 May 2027.
The earlier supply to that customer keeps its own time of supply. It is not shifted to 12 May 2027.

Answer: Case A: 5 March 2027. Case B: 20 April 2027. Interest of ₹300: 12 May 2027.

Example 2

The GST rate on a product changes from 12% to 18% with effect from 1 October 2027. Value of supply is ₹2,00,000. Determine the time of supply and GST payable in two independent cases. Case 1: goods supplied on 25 September 2027, payment received on 28 September 2027, invoice issued on 5 October 2027. Case 2: goods supplied on 3 October 2027, invoice issued on 20 September 2027, payment received on 10 October 2027.

Show the solution

Case 1: the supply is before the change. Payment (28 September) is before the change and the invoice (5 October) is after it.
For supply before the change, payment before and invoice after, the time of supply is the date of receipt of payment: 28 September 2027.
The rate in force on 28 September 2027 is 12%. GST = 12% × ₹2,00,000 = ₹24,000.
Case 2: the supply is after the change. Invoice (20 September) is before the change and payment (10 October) is after it.
For supply after the change, invoice before and payment after, the time of supply is the date of receipt of payment: 10 October 2027.
The rate in force on 10 October 2027 is 18%. GST = 18% × ₹2,00,000 = ₹36,000.

Answer: Case 1: time of supply 28 September 2027, GST ₹24,000 at 12%. Case 2: time of supply 10 October 2027, GST ₹36,000 at 18%.

Exam tips

Draw the timeline first in every rate change question. It prevents wrong case selection and helps you score the step marks.
In voucher questions, copy the key words from the question that show whether the supply is identifiable, and use them in your reasoning.
For interest or late fee questions, always show two separate dates: one for the main supply and one for the extra amount.
State the rule in words before the date. Write it as: provision, facts, conclusion.
In MCQs on this topic, check whether the question gives both a books date and a bank date. The payment date is the earlier of the two.

Practice questions from Time of Supply

Special Cases: Vouchers, Interest, Late Fee, Residual Provisions in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Special Cases: Vouchers, Interest, Late Fee, Residual Provisions: frequently asked questions

What is the time of supply of a gift voucher under GST?

If the goods or services the voucher buys are identifiable when it is issued, it is the date of issue. If they are not identifiable, it is the date of redemption. A general-purpose gift card usually falls in the second case.

When is GST payable on interest charged for late payment?

GST on the interest or late fee arises on the date the supplier receives that amount. The original supply is taxed on its own time of supply. Only the addition in value follows the receipt date.

What does Section 14 of the CGST Act deal with?

Section 14 sets the time of supply when the rate of tax changes between supply, invoice and payment. It applies notwithstanding the general rules in Sections 12 and 13, but only where the rate change happens during the transaction. You pick the right case from the timeline and apply the rate in force on that date.

When do I use the residual provision for time of supply?

Use it only when the time of supply cannot be fixed under the normal rules. If a periodical return has to be filed, the time of supply is the due date of that return. Otherwise it is the date on which the tax is paid.