Is there a GSTR-3B ITC hard block from April 2026? No GSTN advisory, CBIC notification or GST Council decision we could find says that from April 2026 the portal rejects every GSTR-3B where ITC in Table 4A exceeds GSTR-2B. What is verified: the law already limits ITC to invoices in GSTR-2B (Section 16(2)(aa) and Rule 36(4)), excess ITC above the portal limit triggers Form DRC-01C under Rule 88D, and GSTN has hard-locked the auto-populated liability in Table 3 from the July 2025 tax period. This guide covers what is real and the monthly plan that keeps your GSTR-3B clean.
If you handle GST for an Indian business, you may have read that from April 2026 the GST portal simply refuses to save a GSTR-3B in which input tax credit (ITC) is higher than GSTR-2B. That claim is widely repeated, but we could not trace it to any official source. This page was first published on that premise, and we have rewritten it around what GSTN and CBIC have actually notified.
The practical advice does not change much. The law has required you to claim ITC only on invoices that appear in GSTR-2B since 1 January 2022, and the portal already acts on excess claims through DRC-01C. A disciplined monthly reconciliation is still the answer. If you want managed monthly GST reconciliation, see our GST compliance services or view pricing.
What Actually Changed (and What Did Not)
Four verified pieces shape how GSTR-3B is checked today.
Piece one: ITC only on invoices in GSTR-2B. Section 16(2)(aa) of the CGST Act, read with Rule 36(4) as amended from 1 January 2022, allows ITC only where the supplier has furnished the invoice in GSTR-1 or IFF and it is communicated to you in GSTR-2B. This is the legal basis for matching Table 4 of GSTR-3B to GSTR-2B. It is not new in 2026.
Piece two: Rule 88D and Form DRC-01C. Inserted by Notification 38/2023-Central Tax dated 4 August 2023, Rule 88D lets the system compare ITC available in GSTR-2B with ITC availed in GSTR-3B for a tax period. Where the excess crosses the limit set on the portal, you receive Form DRC-01C and have 7 days to pay the difference with interest through DRC-03 or explain it in Part B. GSTN enabled this on the portal through its advisory of 14 November 2023. It works after filing: the return is filed, and the intimation follows.
Piece three: Liability in Table 3 is hard-locked. Under GSTN Advisory No. 606 dated 7 June 2025, the liability auto-populated in GSTR-3B from GSTR-1, GSTR-1A and IFF cannot be edited from the July 2025 tax period. Corrections go through GSTR-1A before filing GSTR-3B. This lock is on outward liability, not on ITC.
Piece four: Hard validations on reclaimed ITC and RCM ITC. GSTN advisories on the Electronic Credit Reversal and Re-claimed Statement and the RCM Liability/ITC Statement (most recently dated 29 December 2025) state that GSTR-3B will not be filed where ITC reclaimed in Table 4D(1) exceeds the reclaim ledger closing balance plus the reversal in Table 4B(2) of that period, or where RCM ITC in Table 4A(2)/4A(3) exceeds RCM tax paid in Table 3.1(d) plus the RCM ledger balance. Check the latest advisory on the portal for the date this applies to your return.
What we could not verify. A "hard lock" that stops all upward edits to Table 4A above the GSTR-2B figure from April 2026, and any 56th GST Council decision directing it. The 56th Council meeting (3 September 2025) is known for GST rate rationalisation, and its press release does not announce such a block. Several industry articles describe an ITC-side lock as expected in 2026, but none cites a dated GSTN advisory. Until one is issued, treat Table 4A as editable and the DRC-01C route as the live consequence of an excess claim.
Why ITC Gets Stuck for Many Businesses
ITC that sits in your books but not in GSTR-2B cannot be claimed under Rule 36(4), whether or not the portal stops you. There are five common reasons.
Supplier did not file GSTR-1. If your vendor has not filed GSTR-1 (or IFF for QRMP filers) for the period in which the invoice was raised, that invoice does not flow into your GSTR-2B. The credit waits until the supplier files.
Invoice rejected or kept pending in IMS. The Invoice Management System went live on the portal in October 2024. Acting in IMS is optional: invoices you do not act on are deemed accepted when GSTR-2B is generated. An invoice you reject does not count as available ITC in GSTR-2B, and an invoice you keep pending is held back from that period's GSTR-2B and stays in IMS for a later period.
Credit note not actioned. When a supplier issues a credit note, it appears in IMS and reduces the ITC in GSTR-2B once accepted or deemed accepted. If your books still show the original full ITC, your claim will be higher than GSTR-2B.
Reversal under Rule 37, 42 or 43 not reclaimed correctly. Rule 37 requires ITC reversal if payment to the supplier is not made within 180 days. Rules 42 and 43 require proportionate reversal for common inputs and capital goods used for exempt supplies or non-business purposes. Reclaims go in Table 4D(1) and are tracked in the Electronic Credit Reversal and Re-claimed Statement. A reclaim larger than the reversals recorded in that statement fails the portal validation described above.
Section 16(4) time bar. ITC for FY 2025-26 invoices must be claimed in GSTR-3B by 30 November 2026 or the date of furnishing the annual return for FY 2025-26, whichever is earlier. ITC not claimed by then is lost.
The cumulative effect is a working capital problem: tax you have paid to suppliers that you cannot yet set off, so the liability goes out as cash.
How GSTR-3B Checks Work on the Portal
When you open GSTR-3B for a tax period, the portal fills in several tables for you.
| GSTR-3B table | Auto-populated from | Editable? |
|---|---|---|
| Table 3.1 and 3.2 (outward liability) | GSTR-1, GSTR-1A, IFF | No: Table 3 liability from the July 2025 tax period (Advisory No. 606), Table 3.2 from the November 2025 tax period (advisory of 5 December 2025); correct through GSTR-1A |
| Table 4A (ITC available) | GSTR-2B | Yes; an excess above GSTR-2B beyond the portal limit leads to DRC-01C |
| Table 4D(1) (ITC reclaimed) | Entered by you | Checked against the reclaim ledger and Table 4B(2) |
| Table 4A(2)/4A(3) (RCM ITC) | GSTR-2B and your own entries | Checked against RCM paid in Table 3.1(d) and the RCM ledger |
| Table 5.1 (interest and late fee) | Computed by the system | Interest is system-computed; the late fee for a previous late return is added by the system |
So there are two different kinds of consequence. A reclaim or RCM ITC above the ledger balance can stop the return from being filed. An ordinary Table 4A claim above GSTR-2B lets the return file, then brings a DRC-01C, and an unanswered DRC-01C blocks your next GSTR-1 or IFF under Rule 59(6).
For what GSTN has actually notified about Table 4A auto-population from GSTR-2B and the IMS timing, read our GSTR-3B Phase 2 ITC auto-population explainer for July 2026.
A Practical Pre-Filing Checklist
Deadline Timeline
Monthly GST Close Calendar for Monthly Filers
Complete each milestone before the 20th so GSTR-3B is filed on reconciled figures
Review IMS Entries
Accept genuine invoices, reject duplicates and wrong invoices; keep pending only while you wait for clarification
Verify Supplier GSTR-1 Filing
GSTR-1 for monthly filers is due on the 11th; follow up with suppliers who have not filed
Download GSTR-2B and Reconcile
GSTR-2B is generated on the 14th; match GSTIN, invoice number, taxable value and the IGST, CGST and SGST split
Resolve Mismatches
Log missing invoices for a later period, ask suppliers to amend, post credit notes, update IMS actions and recompute GSTR-2B if needed
Prepare GSTR-3B
Match Table 4A head by head to GSTR-2B; check Table 4D(1) reclaims against the reclaim ledger
File GSTR-3B and Pay Tax
Late filing attracts interest at 18% p.a. under Section 50(1) on tax paid in cash, plus late fee
Source: Section 39, CGST Act 2017; Rules 36(4), 59 and 61, CGST Rules; GSTN advisories on GSTR-2B and IMS
The most useful change a finance team can make is to reconcile continuously, not on the 20th. The dates below are for monthly filers. QRMP filers file GSTR-3B quarterly by the 22nd or 24th depending on their state (Telangana is in the 22nd group).
Daily
- Review IMS as invoices arrive. Accept genuine invoices. Reject duplicates and invoices that are not yours or are wrong. Use Pending only while you wait for clarification.
- Record accept, reject and pending decisions in your accounting system so your books match GSTR-2B when it is generated.
On the 11th of Each Month
- Check that suppliers have filed GSTR-1 for the previous month. The GSTR-1 due date for monthly filers is the 11th, and QRMP suppliers can upload invoices through IFF up to the 13th.
- Write to suppliers who have not filed, explaining that their invoices will not reach your GSTR-2B until they do.
On the 14th
- Download GSTR-2B as soon as it is generated.
- Match line by line against the purchase register: GSTIN, invoice number, invoice date, taxable value, tax amounts and the head split (IGST, or CGST and SGST).
- Categorise mismatches: missing from GSTR-2B, value mismatch, head mismatch, IMS rejection, credit note not in books, timing difference.
On the 15th to 17th
- For invoices missing from GSTR-2B, leave them out of this month's claim, log them in a "Pending GSTR-2B" tracker and follow up with the supplier.
- For value or head mismatches, ask the supplier to correct the invoice through GSTR-1A for the same period or an amendment in a later GSTR-1 (Section 37(3)).
- Post supplier credit notes in your books before preparing GSTR-3B.
- If an IMS action was wrong, change it and recompute GSTR-2B. This is possible until you file GSTR-3B for that period.
On the 18th to 19th
- Prepare GSTR-3B. Match Table 4A to GSTR-2B head by head.
- Tie reversals in Table 4B to your Rule 37, 42 and 43 workings, and make sure Table 4D(1) reclaims do not exceed the reclaim ledger balance.
- Keep a note of any ITC you claim above GSTR-2B and why, in case a DRC-01C follows.
On the 20th
- File GSTR-3B and pay the tax. Filing late costs interest under Section 50(1) and a late fee, and the late fee for a late return is added by the system to your next GSTR-3B.
How to Reclaim ITC That Is Already Stuck
For ITC that sits in your books but not in GSTR-2B, there are three legitimate paths. The right one depends on why it is stuck.
Path A: Wait for supplier filing. If the supplier has not filed GSTR-1, push them to file. Once they do, the invoice flows into your next GSTR-2B and you can claim the ITC in that period. Track each pending invoice with an "expected GSTR-2B period" column.
Path B: Fix a wrong IMS rejection. Before you file GSTR-3B for the period, change the action in IMS and recompute GSTR-2B. After GSTR-3B is filed, the supplier has to amend or re-report the invoice, after which it returns to IMS and can be accepted in a later period.
Path C: Annual return reconciliation. GSTR-9 and GSTR-9C capture differences between books and returns for the year, including ITC claimed in a later year's returns within the Section 16(4) limit. They do not create a new time window for ITC. The annual return for FY 2025-26 is due by 31 December 2026 (GSTR-9 has been made optional for aggregate turnover up to Rs 2 crore in recent years; check the exemption notified for FY 2025-26).
What you cannot do: pay tax in cash to make an unmatched ITC claim valid. Cash payment settles liability; it does not make ITC eligible.
Penalty and Interest Exposure
Excess ITC and DRC-01C. If you claim ITC above GSTR-2B and receive a DRC-01C, you pay the excess through DRC-03 with interest, or explain it. Interest on ITC wrongly availed and utilised is 18% per annum under Section 50(3) (rate as notified; see Notification 9/2022-Central Tax).
Late filing interest under Section 50(1). Tax paid after the due date attracts interest at 18% per annum. For a GSTR-3B filed late, interest is charged on the part of the tax paid through the electronic cash ledger, from the day after the due date to the date of payment.
Late fee. Rs 50 per day (Rs 25 CGST plus Rs 25 SGST) for a GSTR-3B with tax liability, and Rs 20 per day (Rs 10 plus Rs 10) for a nil return. Under Notification 19/2021-Central Tax the fee is capped per return at Rs 500 for nil returns, and otherwise at Rs 2,000 for aggregate turnover up to Rs 1.5 crore, Rs 5,000 for Rs 1.5 crore to Rs 5 crore, and Rs 10,000 above Rs 5 crore.
Cash flow drag. ITC that cannot be claimed this month has to be paid out as cash GST and is recovered only when the supplier files. For a business with Rs 50 lakh of taxable purchases a month at 18% GST (Rs 9 lakh of ITC), an unmatched 5% means Rs 45,000 of ITC deferred each month.
Building a Reconciliation System That Holds Up
Teams that file on time with few notices usually do five things.
- They check a new vendor's GST filing record before onboarding.
- They use accounting software that imports GSTR-2B and produces a reconciliation report by GSTIN, invoice number and tax amount.
- They review IMS through the month, not only on the 14th.
- They have a vendor escalation policy and contract terms that allow holding back payment of the tax portion until the invoice appears in GSTR-2B.
- They keep an "ITC at risk" register: any input invoice older than 3 months that has not reached GSTR-2B is escalated. The Section 16(4) clock is real.
Action Plan for FY 2026-27
Whether or not an ITC-side lock is notified later, the same steps protect you.
- Compare your last three months of GSTR-3B Table 4A with GSTR-2B. Quantify ITC in books that has not been claimed. This is your at-risk pool.
- Categorise the pool by reason: supplier non-filing, IMS rejection, credit note pending, value mismatch, timing.
- Run the resolution path for each category, with 30 November 2026 (Section 16(4) for FY 2025-26) as the hard backstop.
- Set a monthly close calendar with the daily, 11th, 14th, 18th and 20th milestones above.
- Tell vendors that their GSTR-1 filing decides whether you can take credit for their invoices.
- Watch the GSTN advisories page on gst.gov.in for any notified change to Table 4 before relying on commentary.
Where Tax Garden Fits In
Reconciling GSTR-2B, following up with suppliers, reviewing IMS actions and preparing GSTR-3B from reconciled figures is a monthly discipline, not a last-48-hours task.
Tax Garden's GST filing services cover GSTR-2B reconciliation, IMS review, supplier follow-up, reversal tracking under Rules 37, 42 and 43, and GSTR-3B preparation and filing by the due date.
If you want to estimate your GST exposure or run a quick check against your books, our GST calculator and guide to GSTR-2B reconciliation are good starting points. For a DRC-01C already on your dashboard, see our DRC-01B and DRC-01C reply guide.
Frequently Asked Questions
What is Form DRC-01C and how many days do I get to respond?
Form DRC-01C is an intimation issued under Rule 88D of the CGST Rules when the ITC availed in GSTR-3B exceeds the ITC available in GSTR-2B beyond the limit set on the portal. You have 7 days to either pay the excess with interest through DRC-03 or file a reply in Part B explaining the difference. If you do neither, filing of your next GSTR-1 or IFF is blocked under Rule 59(6).
If my supplier files GSTR-1 late, can I still claim the ITC?
Yes. Once the supplier files the pending GSTR-1 or IFF, the invoice flows into your GSTR-2B for the period in which it was filed, and you can claim the credit in that month's GSTR-3B. The claim must be made before the Section 16(4) deadline, which for FY 2025-26 invoices is 30 November 2026 or the date of filing the annual return, whichever is earlier.
When do I have to reverse ITC under Rule 37?
Under Rule 37, if you do not pay the supplier the invoice value plus tax within 180 days of the invoice date, the ITC taken on that invoice must be reversed in GSTR-3B, with interest. Once you pay the supplier, the reversed credit can be reclaimed in a later return. Tracking vendor payments against the 180-day clock avoids surprise reversals.
Does paying extra GST in cash fix an excess ITC claim?
No. Cash payment settles tax liability but does not make ineligible or unmatched ITC valid. If ITC claimed is higher than what GSTR-2B supports, the excess must be reduced in GSTR-3B or paid back with interest through DRC-03. The underlying fix is to get the supplier to file or amend GSTR-1 so the credit appears in GSTR-2B.
What happens to ITC on an invoice I wrongly rejected in IMS?
A rejected invoice does not flow into your GSTR-2B as available credit. You can change an IMS action and recompute GSTR-2B until you file GSTR-3B for that period. After GSTR-3B is filed, the practical route is for the supplier to amend or re-report the invoice, after which it comes back to IMS and can be accepted in a later period.
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Sources
Section 16(2)(aa), 16(4), 37(3), 39 and 50 of the CGST Act 2017; Rules 36(4), 37, 42, 43, 59(6) and 88D of the CGST Rules; Notification 38/2023-Central Tax dated 4 August 2023 (Rule 88D and Form DRC-01C); Notification 19/2021-Central Tax (GSTR-3B late fee caps); Notification 9/2022-Central Tax (Section 50(3)); GSTN advisory of 14 November 2023 on DRC-01C; GSTN Advisory No. 606 dated 7 June 2025 (hard-locking of auto-populated liability); GSTN advisories on IMS (October 2024 and October 2025) and on the Electronic Credit Reversal and Re-claimed Statement and RCM Liability/ITC Statement (29 December 2025). We found no official source for an April 2026 ITC hard block. Always check cbic-gst.gov.in and the advisories on gst.gov.in before relying on a specific figure for filing.
