Rule 37A: When Your Supplier Files GSTR-1 but Not GSTR-3B

Rule 37A 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.

Your supplier files GSTR-1. The invoice appears in your GSTR-2B. You take the credit, correctly, because s.16(2)(aa) is satisfied.

Then the supplier never files GSTR-3B and never pays the tax. Section 16(2)(c) — that the tax has actually been paid to the Government — has failed, through no act of yours.

Rule 37A tells you what to do about it, and when.

Where a supplier has furnished the invoice details in GSTR-1 or IFF but has not furnished the return in GSTR-3B for that period up to 30 September following the end of the financial year in which the credit was availed, the recipient shall reverse the credit by 30 November of that year. Failing that, the amount is payable with interest under s.50. Where the supplier subsequently files that GSTR-3B, the recipient may re-avail the credit.

The timeline

Why this rule exists

Section 16(2)(c) conditions credit on the tax having been actually paid to the Government, either in cash or through utilisation of admissible credit.

That condition has always been controversial, because it makes the recipient's credit depend on the supplier's conduct. Constitutional challenges have been mounted and largely unsuccessful, with courts holding that the condition is a legitimate legislative choice, though several have read it down where the recipient can show payment to the supplier and the department has not first proceeded against the supplier.

Rule 37A does not resolve that debate. What it does is supply a mechanism and a timeline, so that the position is administered rather than litigated invoice by invoice.

What triggers it, and what does not

Triggers Rule 37A: the supplier reported the invoice in GSTR-1 or IFF but did not file GSTR-3B for that period by 30 September following the financial year of availment.

Does not trigger Rule 37A:

• the supplier did not report the invoice at all — then s.16(2)(aa) fails and the credit should never have been taken; the reversal is under the ordinary provisions, not Rule 37A;
• the supplier filed GSTR-3B but with a shortfall — the invoice was reported and the return was filed; a mismatch of that kind is dealt with through s.61 scrutiny or Rule 88C, not Rule 37A;
• reverse charge supplies — the recipient pays the tax itself;
• imports — the bill of entry is the document and there is no supplier GSTR-3B.

How to comply

Identify the exposure. GSTR-2B does not tell you whether the supplier filed GSTR-3B. The supplier's return filing status is available on the portal through the Search Taxpayer function, which shows the last returns filed. For a large purchase base this needs to be automated.

Reverse by 30 November in GSTR-3B, in the reversal field for "others". There is no separate form.

Track for re-availment. Once the supplier files, the credit comes back. Keep an invoice-level register of what was reversed under Rule 37A and against which supplier, so the reclaim can be identified.

Do not confuse it with Rule 37. Rule 37 is your own failure to pay within 180 days. Rule 37A is your supplier's failure to file. Different triggers, different timelines, both reversals. The 180-day rule →

Interest

If the reversal is made by 30 November, no interest arises — the rule gives that window expressly.

If it is not, the amount is payable along with interest under s.50. The rate is 18% under s.50(1), and the interest runs from the date the amount became payable.

Note the interaction with s.50(3): where credit has been wrongly availed and utilised, interest is payable at the rate notified under that sub-section, and Rule 88B(3) provides that credit wrongly availed shall be construed to have been utilised when the balance in the electronic credit ledger falls below the amount of credit wrongly availed. A recipient carrying a large credit balance throughout may therefore have availed but not utilised — a real distinction for interest. Interest on wrongly availed ITC →

Commercial protection

Rule 37A makes supplier filing behaviour a credit risk. Standard responses:

• a contractual warranty that the supplier will file GSTR-1 and GSTR-3B within the prescribed time;
• a right to withhold the tax component until the supplier's GSTR-3B for the period is filed;
• an indemnity for credit lost, including interest;
• periodic filing checks on high-value suppliers before releasing payment;
• supplier scorecards built from portal filing status.

None of these changes the tax position. They change who bears the loss.

Key takeaways

• Rule 37A applies where the supplier reported the invoice but did not file GSTR-3B by 30 September following the year of availment.
• The recipient must reverse by 30 November, in GSTR-3B.
• Failing that, the amount is payable with interest under s.50.
• Re-availment is permitted once the supplier files the return.
• It is distinct from Rule 37, which is triggered by the recipient's own non-payment.
• Filing status must be monitored — GSTR-2B does not show it.

Read next

• The 180-Day Rule: Rule 37 Reversal and Reclaim
• ITC Where the Supplier Defaults in Paying Tax
• Interest on Wrongly Availed ITC: Section 50(3)
• ITC Reconciliation Template: GSTR-2B vs Books

Disclaimer: Positions stated as on 5 September 2026, based on the CGST Act and Rules as amended to 31 March 2026 (ICAI Bare Law, 12th edition).