Residual Time of Supply explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
Every time-of-supply provision in the Act can fail. The invoice was never raised, the payment date is unascertainable, the service has no identifiable completion, the records are incomplete.
Sections 12(5) and 13(5) exist for exactly that situation, and they resolve it in a way that is unusual — by reference to a compliance event rather than a commercial one.
Where the time of supply cannot be determined under the preceding sub-sections, it shall be: (a) the date on which a periodical return has to be filed, in a case where such a return has to be filed; or (b) in any other case, the date on which the tax is paid. Identical language appears in s.12(5) for goods and s.13(5) for services.
The text
"(5) Where it is not possible to determine the time of supply under the provisions of sub-section (2) or sub-section (3) or sub-section (4), the time of supply shall— (a) in a case where a periodical return has to be filed, be the date on which such return is to be filed; or (b) in any other case, be the date on which the tax is paid."
Note two drafting points.
Clause (a) says "is to be filed", not "is filed". The reference is to the due date of the return, not the date it was actually filed. A late filer does not get a later time of supply.
Clause (b) says "the tax is paid" — the actual date of payment. This limb is aimed at persons with no periodical return obligation.
When it actually applies
The residual rule is not a planning tool. It applies only where the ordinary rules genuinely cannot produce an answer, which is rarer than it sounds because the ordinary rules themselves have backstops.
For goods, s.12(2)(a) includes the last date on which the invoice was required to be issued, which is nearly always ascertainable from s.31. So s.12(5) rarely bites.
For services, s.13(2)(b) points to the date of provision of service, and s.13(2)(c) adds a further backstop — "the date on which the recipient shows the receipt of services in his books of account, in a case where clauses (a) and (b) do not apply." That third limb absorbs most residual cases.
For reverse charge, the first proviso to s.13(3) already supplies the date of entry in the books of account of the recipient.
What is left is genuinely marginal:
- supplies where no invoice exists, no payment was made, and the completion date is unascertainable — typically reconstructed transactions found during an audit;
- deemed supplies where the statute creates the supply but no ordinary event marks it;
- cases involving persons with no periodical return obligation, where clause (b) applies.
Why the return due date
The choice is deliberate. Where the commercial facts do not fix a date, the law fixes one that both parties can identify from the record: the statutory due date of the return for the period.
That produces a determinate liability, a determinate interest start date under s.50, and a determinate limitation start point under s.73 or s.74A — all of which run from return due dates in any event.
Using the actual filing date would let a non-filer defer the tax point indefinitely, which is why the drafting says "is to be filed".
The related provision people confuse it with
Section 13(2)(c) is not the residual rule. It is a limb of the ordinary rule for services:
"(c) the date on which the recipient shows the receipt of services in his books of account, in a case where the provisions of clause (a) or clause (b) do not apply."
This is a recipient-side date used in the ordinary computation, and it does most of the work that s.13(5) would otherwise have to do. In practice, if you find yourself reaching for s.13(5) for a service, check s.13(2)(c) first.
Practical significance
The residual rule matters less for planning than for audit defence.
Where an officer identifies an unrecorded supply and proposes a time of supply, the sequence has to be respected: s.12(2)/13(2), then s.12(3)/13(3) for RCM, then s.12(4)/13(4) — now omitted for vouchers — and only then s.12(5)/13(5). An officer who jumps to the residual rule without exhausting the earlier ones has misapplied the section, and the difference can move the liability across periods and affect limitation.
Equally, a taxpayer cannot invoke s.12(5) to push a liability into a later period when s.12(2)(a) supplies a perfectly ascertainable invoice due date.
Key takeaways
- s.12(5) and s.13(5) apply only where the ordinary rules cannot determine the time of supply.
- The time of supply is the due date of the periodical return, or where none, the date the tax is paid.
- The reference is to the date the return is to be filed, not the date it was filed.
- s.13(2)(c) — the recipient's books entry — absorbs most residual service cases first.
- For RCM, the first proviso to s.13(3) already supplies a books-entry backstop.
- The provisions matter mainly in audit and adjudication, where the order of application must be respected.
Read next
- When the Invoice Is Late: What the Time of Supply Becomes
- Section 12-13 CGST Act: Time of Supply
- The 60-Day Rule: Time of Supply Under Reverse Charge
- Interest on Delayed GST Payment: Section 50
Disclaimer: Positions stated as on 5 September 2026, based on ICAI Background Material on GST, Volume I (2026 edition).