TL;DR: Input tax credit on any invoice or debit note dated in FY 2025-26 (1 April 2025 to 31 March 2026) is lost for good after the earlier of 30 November 2026 or the day you file GSTR-9 for that year. Reconcile GSTR-2B against your purchase books now, chase non-filing vendors, reverse what Rule 37A and Rule 37 require, and claim everything valid in the October 2026 GSTR-3B due 20 November. Quarterly (QRMP) filers: your last return before the deadline is the July-September GSTR-3B due 22 or 24 October, so reconcile this week. Do not file GSTR-9 early.
The ITC deadline for FY 2025-26 is 30 November 2026, and for many businesses it is earlier. Section 16(4) of the CGST Act sets the cut-off at the earlier of 30 November following the end of the financial year or the date you furnish the annual return[1]. A business with ₹3.2 lakh of unclaimed credit sitting in unmatched or wrongly rejected invoices has 46 days from today, 15 October, to recover it. After that the credit becomes a permanent cost. This post covers what the section says, how to reconcile GSTR-2B, what to do about vendors who never filed, the 180-day payment rule, blocked credits, the Invoice Management System, a worked rupee example, and a dated calendar to 30 November.
What section 16(4) actually says
Section 16(4) is a time bar. It does not grant credit. It says a registered person cannot take ITC on an invoice or debit note after the earlier of two dates: 30 November following the end of the financial year to which the invoice or debit note pertains, and the date of furnishing the annual return for that year[1].
For FY 2025-26 that gives two possible cut-offs.
| Scenario | Effective ITC cut-off for FY 2025-26 invoices |
|---|
| You file GSTR-9 after 30 November 2026 | 30 November 2026 |
| You file GSTR-9 on, say, 10 November 2026 | 10 November 2026 |
| You file GSTR-9 on 10 October 2026 | 10 October 2026 (already passed for you) |
| Debit note dated 5 May 2026 (FY 2026-27) | Not in this window — runs to 30 November 2027 |
Three points that trip people up.
The invoice date decides the financial year, not the date goods arrived or the vendor uploaded it. A 28 March 2026 invoice reported in May still belongs to FY 2025-26.
Filing GSTR-9 early shortens your own window. If your annual return is turned in before you have claimed everything, you have cut the deadline yourself. GSTR-9 for FY 2025-26 is normally due 31 December, so there is no reason to rush it.
The time bar is on taking the credit in a return, so the GSTR-3B that carries the claim must be filed on or before the cut-off. The October 2026 GSTR-3B is due 20 November and is the last regular monthly return that fits. Quarterly (QRMP) filers get one return in the window, the July to September quarter, due on 22 or 24 October depending on state.
Sections 16(5) and 16(6), inserted by the Finance (No. 2) Act 2024, gave one-time relief for FY 2017-18 to 2020-21 and for revoked cancellations[2]. They do not help FY 2025-26. The ICAI summary of the Finance Bill 2026 changes lists a rewrite of section 15(3)(b) on post-supply discounts but no change to section 16(4)[3]. I found no 2026 notification that moves this deadline, so plan around 30 November.
The four conditions behind every credit
Beating the time bar is only one test. Section 16(2) also requires a valid tax invoice or debit note, receipt of the goods or services, the supplier's invoice appearing in your GSTR-2B (the details furnished by the supplier in GSTR-1 or IFF), and actual payment of the tax to the government by the supplier[1]. You must also have filed your own GSTR-3B. Missing any one makes the credit contestable, however early you claim it.
That is why reconciliation is the real job. The deadline just sets the clock.
GSTR-2B reconciliation: the workflow
GSTR-2B is the static, auto-drafted statement of credit available to you for each month. Your purchase register is what you believe you are owed. The gap between them is your deadline risk. Run this in order.
Step 1: pull the data
Download GSTR-2B for all twelve months of FY 2025-26, April 2025 to March 2026, plus the April to September 2026 statements, because late-reported FY 2025-26 invoices land in those. Export your purchase register for the same invoice dates. Clean vendor GSTIN typos first with the GSTIN validator; one wrong digit hides an invoice from any matcher.
Step 2: match on three keys
Match on vendor GSTIN, invoice number (strip leading zeros, slashes and spaces) and invoice date. Then compare taxable value and each tax head.
Step 3: sort every row into one of five buckets
This is where the GST ITC Rescue Workbook helps if you do not already have a matcher. It ships a GSTR-2B versus books matcher with section 16(4) flags and vendor follow-up email templates, and you can see the GST ITC Rescue Workbook for FY 2025-26 if you want a ready structure. A spreadsheet with VLOOKUP and a pivot works too. The buckets matter more than the tool.
| Bucket | What it means | Action by 20 November |
|---|
| Matched | Present in books and GSTR-2B, values agree | Claim in GSTR-3B |
| In books, not in 2B | Vendor has not reported, or reported under another GSTIN or date | Chase vendor for GSTR-1 or amendment by 11 November |
| In 2B, not in books | Purchase not recorded, or not yours | Verify receipt; book it or reject in IMS |
| Value or tax mismatch | Same invoice, different amounts or tax split | Vendor files an amendment, or claim the lower figure |
| Date mismatch across year-end | Invoice dated March but booked April, or the reverse | Fix the FY tag; the invoice date governs |
Step 4: book the cut-off vendors
Rank vendors by credit at stake and call the top ten. A vendor who files GSTR-1 on 11 November for October can still add a September-dated or earlier invoice, and it will appear in the October GSTR-2B generated around 14 November. That is your last clean window, so the follow-up emails should go out this week, not in the second half of November.
Vendors who have not filed: Rule 37A
Rule 37A deals with a different problem. You claimed credit, the supplier reported the invoice, but the supplier never filed GSTR-3B. The rule applies when the supplier has not furnished GSTR-3B for the period by 30 September following the end of the financial year in which you took the ITC. You must then reverse that ITC while filing a GSTR-3B on or before 30 November following the end of that financial year, with interest under section 50 if you miss it[4].
For FY 2025-26 credit, that means two dates:
30 September 2026 — the supplier's GSTR-3B status is tested on this date.
30 November 2026 — the reversal must be made by then. In practice that is the October 2026 GSTR-3B, due 20 November.
GSTN's advisory of 14 November 2023, issued when the rule first applied to FY 2022-23, says to report the reversal in Table 4(B)(2) of GSTR-3B[4]. Check that the table position still matches the current GSTR-3B form before filing.
Re-availing the credit
Rule 37A is a reversal, not a loss. If the supplier later files the GSTR-3B for that period, you can re-avail the amount in a later GSTR-3B[4]. Rule 37(4) says the section 16(4) time limit does not apply to re-availing credit that was reversed earlier, provided you originally took it within time[10]. Chasing the vendor is still worth doing, because it saves the reversal interest and the cash-flow hit. For vendors who filed GSTR-1 but not GSTR-3B, call before 20 November, not after.
To work out the interest you will owe if you miss the reversal, use the GST late fee and interest calculator.
The 180-day payment rule: Rule 37
The second reversal is about payment. You have to pay your supplier the invoice value plus tax within 180 days of the invoice date. Miss that and you reverse the ITC attributable to the unpaid portion, with interest under section 50, and you can take it back when you pay[5]. The rule does not apply to supplies where you pay tax under reverse charge[5].
Take an invoice dated 10 April 2026. The 180 days run out on 7 October 2026. If it is still unpaid today, the credit on it has to be reversed. The reversal goes in the GSTR-3B for the tax period immediately following the 180-day period. Day 180 here is 7 October, so the rule's wording points to the November return (due 20 December). If you want to be safe, reverse it in the October return. Pay the vendor, and you can re-claim. Paying before day 180 is better still, because it avoids both the reversal and the interest.
| Feature | Rule 37A | Rule 37 |
|---|
| Trigger | Supplier did not file GSTR-3B by 30 September after year-end | You did not pay the supplier within 180 days of invoice date |
| Whose default | Vendor | You |
| Reversal deadline | On or before 30 November following the year | GSTR-3B for the tax period immediately after the 180 days (safe option: the earlier return) |
| Interest | Section 50, if reversal is late | Interest under section 50 (on utilised credit, per Rule 88B) |
| Re-availment | When supplier files the GSTR-3B | When you pay the supplier |
| Re-claim vs s.16(4) | Not time-barred (Rule 37(4)), if originally claimed in time | Not time-barred (Rule 37(4)), if originally claimed in time |
Blocked credits under section 17(5)
Some credit is never available, however early you claim. These are the items clients most often try to claim. Check each against the section before you put them in GSTR-3B[1]:
Motor vehicles for carrying fewer than 13 people, unless used for the specified purposes such as further supply, passenger transport or driver training (section 17(5)(a)).
Food and beverages, outdoor catering, beauty treatment, health services, cosmetic and plastic surgery, with a narrow exception where the same category of service is your outward supply (17(5)(b)).
Works contract services and goods or services used for constructing an immovable property, other than plant and machinery (17(5)(c) and (d)).
Goods or services used for personal consumption (17(5)(g)).
Goods lost, stolen, destroyed, written off or given as gifts or free samples (17(5)(h)).
Tax paid on a section 74 demand for periods up to FY 2023-24 (17(5)(i)).
Blocked items that sit in GSTR-2B often flow into GSTR-3B by habit. Strip them out; it is cheaper than reversing them with interest later. Check the tax value of borderline invoices with the GST calculator.
IMS: accept, reject, pending
The Invoice Management System went live from the October 2024 tax period. It lets you mark each supplier-reported record as accepted, rejected or pending before GSTR-2B is finalised[6]. The practical effects for this deadline:
Accepted records flow into GSTR-2B as available credit.
Rejected records are excluded from your ITC and go back to the supplier to amend.
Records with no action are treated as accepted when GSTR-2B is generated.
Pending records are held back and, per ClearTax's summary of the process, are not acted on until the section 16(4) limit[7].
The September 2025 GSTN advisory changed pending for some document types. From the October 2025 tax period, recipients can keep specified records pending for one tax period (one month for monthly filers, one quarter for quarterly filers). Those records include credit notes and certain downward amendments of invoices or debit notes[8]. The same advisory added an ITC declaration facility, so you can state the ITC actually availed and the amount reversed, and optional remarks on rejected or pending records. In April 2026, GSTN added an Excel-based IMS offline tool for acting on invoices individually or in bulk[9].
How IMS can cost you credit before 30 November
Pending is not a safe parking lot for plain invoices. An invoice you leave pending past the cut-off cannot be claimed. A rejected invoice that you rejected by mistake is the other trap, because it vanishes from GSTR-2B. If you rejected something by mistake, you can change the action until you file that period's GSTR-3B, then recompute GSTR-2B. If the supplier has already filed GSTR-3B, the 19 June 2025 GSTN advisory applies: the supplier re-reports the same document in GSTR-1A or a later amendment table and you accept it in IMS[7]. Start that now, because it needs the vendor to act.
A clean routine for the next five weeks: open IMS on 1 November, clear every "no action" row on FY 2025-26 invoices, accept what matches, reject what is not yours, and leave nothing pending that you intend to claim.
Worked example: ₹3.2 lakh at risk
This is an illustrative SME, a Pune trading business with ₹4.8 crore turnover. At that size it is QRMP-eligible, so its last return before the deadline could be the July-September quarter due 22 or 24 October. Its FY 2025-26 reconciliation on 15 October 2026 shows these gaps. All figures are ITC in rupees.
| Line | Issue | ITC (₹) | Status |
|---|
| A | Vendor X: 21 invoices in books, not in 2B | 1,32,000 | At risk, lost after 30 Nov |
| B | Vendor Y: 11 invoices in books, not in 2B | 78,500 | At risk, lost after 30 Nov |
| C | Vendor Z: 6 invoices in books, not in 2B | 36,000 | At risk, lost after 30 Nov |
| D | Invoices rejected in IMS by mistake | 74,200 | Recoverable only if corrected |
| E | Credit claimed, vendor GSTR-3B unfiled at 30 Sep (Rule 37A) | 1,18,000 | Reverse by 30 Nov |
| F | Invoices unpaid beyond 180 days (Rule 37) | 43,500 | Reverse or pay |
| G | Staff lunch and catering, wrongly in claim (17(5)(b)) | 31,800 | Do not claim |
The math:
Credit that disappears for good if nothing happens: A + B + C = 1,32,000 + 78,500 + 36,000 = ₹2,46,500.
Add the wrongly rejected lines D = ₹74,200. Total at risk = ₹2,46,500 + ₹74,200 = ₹3,20,700.
Reversal exposure, recoverable later when the vendor files or you pay: E + F = 1,18,000 + 43,500 = ₹1,61,500.
Remove G from the claim: ₹31,800 less in GSTR-3B.
Two results stand out. The first is that line A alone is 41% of the total at-risk figure (1,32,000 ÷ 3,20,700), and it comes down to a single vendor filing. The second is that paying the ₹43,500 of old invoices eliminates a reversal and its interest at once. In this business, a day spent on vendor X is worth more than a week of internal tidying.
Mistakes CAs see every November
Filing GSTR-9 early. It resets the cut-off to that date. Hold the annual return until every claim is in.
Treating 30 November as the day to start. The GSTR-3B for October is due 20 November. The real deadline for vendor action is the 11 November GSTR-1 date.
Assuming GSTR-2B equals proof of payment. A listed invoice still falls under Rule 37A if the vendor's GSTR-3B is missing.
Letting IMS auto-accept. Deemed acceptance pulls in invoices that are wrong, blocked or not yours.
Forgetting to re-avail. Once the vendor files or you pay, the reversed credit stays in your ledger of lost money unless you claim it back in a later GSTR-3B.
Action calendar: 15 October to 30 November 2026
| Date | Action |
|---|
| 15 to 17 October | Download GSTR-2B for April 2025 to September 2026; export the purchase register; run the match |
| 18 to 19 October | Send written mismatch lists to the top ten vendors by credit value |
| 20 October | September 2026 GSTR-3B due for monthly filers; claim every matched, eligible FY 2025-26 credit |
| 22 or 24 October | QRMP quarterly GSTR-3B (state-based date); your last return before the deadline, so reconcile this week |
| 25 to 31 October | Pay unpaid vendors older than 120 days to avoid Rule 37 reversals (invoices dated before about 3 June 2026 hit day 180 before 30 November) |
| 1 to 7 November | Clear IMS: accept, reject, remove pending on FY 2025-26 rows |
| 11 November | Vendors' October GSTR-1 due; the last clean date for late invoices to appear |
| 14 November | October GSTR-2B generates; re-run the match on the new statement |
| 15 to 19 November | Finalise Rule 37A reversals and Rule 37 reversals; prepare the claim |
| 20 November | October 2026 GSTR-3B due; claim, reverse, pay |
| 30 November | Section 16(4) cut-off for FY 2025-26 credit |
Put these dates into the GST compliance calendar for 2026 so reminders reach the whole accounts team. Verify every due date on the GST portal, because extensions are common.
Frequently Asked Questions
What is the last date to claim ITC for FY 2025-26?
The earlier of 30 November 2026 and the date you file GSTR-9 for FY 2025-26, under section 16(4) of the CGST Act. If you file the annual return after 30 November, the date is 30 November.
Can I claim FY 2025-26 ITC in the November 2026 return?
No. The November return is filed in December, after the cut-off. The October 2026 GSTR-3B, due on 20 November, is the last monthly return that can carry the claim.
My vendor has not filed GSTR-3B. Do I lose the credit?
You reverse it if the vendor's GSTR-3B for the period was not filed by 30 September 2026, using Rule 37A, and the reversal is due by 30 November 2026. You can re-avail it in a later GSTR-3B once the vendor files. Rule 37(4) keeps that re-claim outside the section 16(4) time bar, as long as the original claim was in time.
What happens if I do not pay a supplier within 180 days?
You must reverse the credit on the unpaid amount with interest under section 50. You can re-claim it after paying; Rule 37(4) keeps the re-claim outside the time bar. Reverse-charge supplies are outside Rule 37.
Does IMS change the section 16(4) deadline?
No. IMS controls what flows into GSTR-2B and GSTR-3B. The deadline is unchanged, and a record left pending or wrongly rejected can still expire with the time bar.
Should I file GSTR-9 before 30 November?
Not unless every FY 2025-26 claim is already in. Filing GSTR-9 sets the cut-off at that filing date, which can be earlier than 30 November.
Sources
CBIC, Circular 237/31/2024-GST, reproducing section 16(4) to (6) of the CGST Act (accessed 15 October 2026). The 30 November date came in through Finance Act 2022 section 100(b), in force from 1 October 2022 (Notification 18/2022-CT).
CBIC, Circular 237/31/2024-GST on sections 16(5) and 16(6) (accessed 15 October 2026)
ICAI, GST Amendments Proposed through the Finance Bill 2026 (accessed 15 October 2026)
Taxmann, Understanding Rule 37A and the GSTN advisory of 14 November 2023 (accessed 15 October 2026)
Notification 26/2022-Central Tax, 26 December 2022, inserting Rule 37A (accessed 15 October 2026); CGST Rules 2017, rule 37(4) (accessed 15 October 2026)
ClearTax, Invoice Management System process flow (accessed 15 October 2026)
EY Tax Alert, GSTN advisory of 23 September 2025 on IMS changes (accessed 15 October 2026)
GSTN, advisory on the IMS Offline Tool, April 2026 (accessed 15 October 2026)
Disclaimer: This article is for informational purposes only and does not constitute financial, tax, or legal advice. Consult a qualified professional for advice specific to your situation.
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