ITC Reversal in 180 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.
If you claimed input tax credit on a purchase but have not paid the supplier within 180 days of the invoice, the credit has to go back. You reverse it in GSTR-3B with interest, and you can take it again once you pay. This article walks through how Rule 37 works and how to keep a clean calendar.
Under the second proviso to section 16(2) and Rule 37(1), a recipient who has not paid the supplier the value of the supply along with the tax within 180 days from the date of the invoice must pay or reverse the ITC, in proportion to the unpaid amount, with interest under section 50. The reversal is made in GSTR-3B for the tax period immediately following the 180-day period. Under Rule 37(2) and 37(4), the credit can be re-availed when payment is made, and the section 16(4) time limit does not apply to that re-claim.
What the rule says
Rule 37(1) applies to any inward supply of goods or services on which you availed ITC, other than a supply on which you pay tax under reverse charge. If you fail to pay the supplier, whether wholly or partly, the value of the supply along with the tax within the 180-day limit, you must:
- pay or reverse an amount equal to the ITC availed, proportionate to the amount not paid;
- pay interest under section 50; and
- do both while furnishing GSTR-3B for the tax period immediately following the period of 180 days from the date of issue of the invoice.
The 180 days run from the invoice date, not from the date you received the goods or the date the invoice reached you. The payment that counts is payment of the value along with the tax. Paying only the taxable value and leaving the GST unpaid does not meet the test.
To keep the logic straight: section 16(2) is the condition in the Act, and Rule 37 is the machinery. Section 16(2) also carries a third proviso that lets you take the credit on payment, which is the basis for the re-claim described below. To see how the wider conditions fit, read ITC eligibility under section 16. If you want your payables checked against the credit you have claimed, an ITC reconciliation advisory review is the usual starting point.
Worked example
This is an illustration with round figures. You buy goods on an invoice dated 10 January 2026 for Rs. 1,00,000 plus GST at 18 percent, so the invoice total is Rs. 1,18,000 and the ITC is Rs. 18,000. The 180th day falls on 9 July 2026.
| Situation | What Rule 37 requires |
|---|---|
| Rs. 1,18,000 paid by 9 July 2026 | No reversal |
| Nothing paid by 9 July 2026 | Reverse Rs. 18,000 with interest in GSTR-3B for August 2026, the period following the 180 days |
| Rs. 59,000 paid by 9 July 2026 | Half is unpaid, so reverse Rs. 9,000 with interest |
| You pay the balance on 15 September 2026 | Re-avail the reversed credit in a later return, with no section 16(4) bar |
Because the 180th day falls in July, the return that follows is the one for August. If you want to be careful, treat the return of the month in which the 180th day ends as the last safe point to reverse, since interest runs until the amount is reversed.
Supplies the rule does not touch
The rule is narrower than many accounting teams assume. The following are outside the reversal or are treated as paid:
- Reverse charge supplies. Rule 37(1) excludes them. The Background Material notes that IGST paid under reverse charge on import of services falls under section 5(3) of the IGST Act, so credit is not lost if the overseas supplier remains unpaid.
- Schedule I supplies without consideration. The first proviso to Rule 37(1) deems the value to be paid.
- Additions to value under section 15(2)(b). The second proviso deems these paid too, because such amounts are added for GST only and never reach the supplier.
- Amounts you are not liable to pay. The material gives the example of a post-sale discount where no GST credit note exists: the recipient is not required to pay that part of the consideration.
One point the material raises and leaves open: IGST on import of goods is not reverse charge under section 9(3) or 9(4), and the definition in section 2(98) does not stretch that far. If you import goods and have unpaid overseas suppliers, take advice before relying on either reading.
Reclaiming the credit
Once you pay the supplier, Rule 37(2) entitles you to re-avail the credit. Rule 37(4) removes the time limit of section 16(4) for re-availing credit that was reversed earlier under the Act or the Chapter. The Background Material draws a practical line here. The original claim must be made within the section 16(4) window or it is lost for good. A credit that was properly availed in time, then reversed under Rule 37, can be reclaimed at any later date.
A related trap is settlement at a lower price. If a supplier agrees to accept less than the invoice value, the material says a GST credit note under section 34 has to be issued in time. Paying less than the original invoice value without that credit note attracts a Rule 37 reversal for the shortfall. The deadline for that credit note is covered in credit notes under section 34 and the recipient's reversal.
A simple process to avoid reversals
- Run a payables ageing report by invoice date, not by due date under the commercial terms.
- Flag every invoice that will cross 150 days with an unpaid balance.
- Decide before day 180 whether to pay, or to reverse in the GSTR-3B that follows.
- Keep a register of amounts reversed so that you re-avail each item after payment.
- Reconcile the register at year end so that reclaims are not missed.
Interest under section 50 is payable on the reversal, so late reversal costs more than early reversal. Filing through GSTR-3B preparation support helps where reversals are picked up only at return time.
Need help with ITC reversals and reclaims?
If your payables and your ITC register do not talk to each other, Rule 37 exposure builds up quietly. Our team can match supplier ageing with the credit you have claimed, compute the proportionate reversal and set up a tracker for reclaims. Start with an ITC reconciliation advisory review of your open payables.
Key takeaways
- Rule 37 needs payment of value plus tax to the supplier within 180 days of the invoice date.
- Part payment leads to a proportionate reversal, not an all-or-nothing one.
- Reverse with interest under section 50 in GSTR-3B for the tax period after the 180 days.
- Reverse charge supplies, Schedule I supplies and section 15(2)(b) additions are outside the reversal.
- Reversed credit can be re-availed on payment, and section 16(4) does not apply to that re-claim.
- The original claim itself must still be made within the section 16(4) time limit.
Read next
- The 180-day rule: Rule 37 reversal and reclaim
- Rule 37A: reversal when the supplier does not file GSTR-3B
- ITC time limit: section 16(4) and 30 November
- Interest on wrongly availed ITC: section 50(3)
Disclaimer: Positions stated as on 30 September 2026, based on the CGST and IGST Acts and Rules as amended, the Finance Act 2026, and the ICAI Background Material on GST (14th Edition, July 2026). Verify current notifications before acting.