Most conditions attached to input tax credit are recoverable if you get them wrong. Documentation can be fixed. A reversal under Rule 37 can be reclaimed when you pay the supplier. Even a wrongly claimed credit can be reversed with interest and the matter closed.
Section 16(4) is not like that. When its deadline passes, the credit is extinguished. There is no reclaim mechanism, no condonation power with the officer, and no appeal that will bring it back, because nothing has gone wrong procedurally. The entitlement has simply ceased to exist.
What the deadline actually is
Credit on an invoice or debit note cannot be taken after the earlier of:
- 30 November following the end of the financial year to which the invoice pertains, or
- the date on which the annual return for that year is actually furnished.
Two points are routinely misread.
It is the earlier of the two, not the later. If you file GSTR-9 for a year on 15 September, your window for that year closed on 15 September, not on 30 November. Filing the annual return early shortens the period you have to find missed credit. That is a genuine argument for not rushing GSTR-9 while a reconciliation is still open.
The relevant year is the year of the invoice, not the year you received it or booked it. An invoice dated March 2026 received in your office in July 2026 belongs to FY 2025-26, and the window for it closed on 30 November 2026. Late-arriving invoices near a year end are exactly the ones that miss.
The 30 November date has applied since the Finance Act 2022 amendment took effect on 1 October 2022. Before that the reference was the due date of the September return, which is where the widely repeated “September deadline” comes from. That framing is out of date and it costs people two months of runway.
What the deadline does not apply to
Not every credit entry is subject to Section 16(4), and knowing the exceptions saves real money.
Reclaims under Rule 37. Where credit was reversed because the supplier was not paid within 180 days, the reclaim on making payment is not subject to Section 16(4). You can pay a two-year-old invoice today and take the credit back.
Reclaims under Rule 37A. Same logic. Where credit was reversed because the supplier had not filed his GSTR-3B, and he subsequently files, the reclaim is available.
Reversal and reclaim under Rule 42 and Rule 43. The annual reworking of common credit produces adjustments in both directions, and these are recomputations of an existing claim rather than fresh claims.
The distinction that matters is between taking credit for the first time and restoring credit that was taken and then reversed. Section 16(4) governs the first. It does not govern the second.
Sections 16(5) and 16(6): the retrospective relief
Section 16(4) generated an enormous volume of litigation in the early years, largely for a reason that had nothing to do with the merits: taxpayers who filed GSTR-3B late, often because of portal problems or genuine hardship, lost credit on invoices where the tax had been fully paid to the government. The revenue lost nothing. The taxpayer lost the credit anyway.
The Finance (No. 2) Act, 2024 inserted Section 16(5) with retrospective effect from 1 July 2017. For the financial years 2017-18, 2018-19, 2019-20 and 2020-21, credit is allowed on any invoice or debit note where the return under Section 39 was furnished up to 30 November 2021. In effect, the four early years were given a single common deadline.
Section 16(6) deals with a different unfairness. Where a registration was cancelled and later revoked, the taxpayer could not file returns during the intervening period and lost credit through no fault of his own. Section 16(6) allows the credit to be taken within the specified period after revocation.
The relief is meaningful, and it applies whether or not you litigated. If a demand was raised against you under Section 16(4) for one of those years and you did not appeal, the position can still be rectified where the credit is now allowable under 16(5) or 16(6). The 54th GST Council specifically addressed this category of case.
Alongside this sits Section 128A, which waives interest and penalty on Section 73 demands for FY 2017-18 to 2019-20 where the tax is paid, applied for in FORM GST SPL-01 or SPL-02 with the procedure in Rule 164. The two work together: 16(5) restores the credit, 128A deals with the interest and penalty on what remains.
None of this changes the position for FY 2021-22 onwards. From that year the ordinary 30 November deadline applies with no relief.
Where credit is actually lost in practice
In our experience the losses cluster into four situations, and none of them involves anyone doing anything obviously wrong.
The supplier files very late. He reports a March 2026 invoice in his GSTR-1 in December 2026. It reaches your GSTR-2B in December, after your 30 November window has closed. The credit was never available to you inside the window, because Section 16(2)(aa) requires the invoice to have been communicated to you, and it had not been. This is the case where the recipient is entirely blameless and still loses.
The invoice never reaches accounts. It sits with the site engineer, or in a project file, or in somebody’s inbox. It surfaces during the annual audit, which is after the deadline.
The credit was parked as a query and forgotten. Somebody flagged an invoice as needing clarification, moved it to a holding schedule, and nobody came back to it. Holding schedules are where credit goes to expire.
GSTR-9 was filed early. The window closed on the filing date and nobody realised the two were connected.
What to actually do about it
The controls are unglamorous and they work.
Run a hard cut-off review in October. Not November. Take the full year to date, list every invoice in the books with no matching credit claimed, and every 2B entry with no matching book entry, and clear the list while there is still a month of runway. October is the last month in which you can still ring a supplier and have him include an invoice in a GSTR-1 that will reach your 2B in time.
Treat the holding schedule as an ageing report. Anything unresolved for two months goes to someone senior. Anything unresolved by September gets decided one way or the other.
Do not file GSTR-9 until the reconciliation is closed. There is no advantage to filing early and there is a real cost to it.
Reconcile every month rather than once a year. Almost every expired credit we see would have been caught by a monthly 2B comparison. The annual reconciliation finds the problem accurately and finds it too late.
The summary
Credit must be taken by 30 November following the end of the financial year, or the date the annual return is filed, whichever comes first. Reclaims under Rules 37, 37A, 42 and 43 are outside that limit. For FY 2017-18 to 2020-21, Section 16(5) supplies a common deadline of 30 November 2021 with retrospective effect, and Section 128A can deal with the interest and penalty. From FY 2021-22 onwards there is no safety net, which makes the October review the most valuable hour in the GST calendar.
