If you claimed GST input tax credit (ITC) and have not paid the supplier the value of the supply plus tax within 180 days of the invoice, CGST Rule 37 generally requires a proportionate reversal for the unpaid amount. Rule 37 also provides for interest from the date that ITC was availed until the reversal amount is paid. That is only one reversal ground: the trigger, possibility of reclaiming credit, return entry and records depend on why the ITC is being reversed.
When does the 180-day Rule 37 reversal apply?
Rule 37 of the CGST Rules applies when a registered recipient has availed ITC on an inward supply but does not pay the supplier the value of that supply along with the tax within the period specified in the second proviso to section 16(2) of the CGST Act. That period is 180 days from the invoice date.
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The reversal is proportionate to the amount still unpaid; it is not automatically the full invoice credit when only part of the consideration remains outstanding. Rule 37 also treats specified Schedule I supplies made without consideration as paid for this purpose, and deems paid the value attributable to amounts added under section 15(2)(b). Check the statutory text against the transaction rather than assuming the payment condition operates identically in every case.
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Rule 37 says to add the relevant credit to output tax liability for the month in which the details are furnished. Its text refers to FORM GSTR-2, but practical return disclosure should be read with subsequent CBIC directions, including Circular 170/02/2022-GST on GSTR-3B Table 4.
Does a Rule 37 reversal attract interest?
Rule 37(3) provides for interest at the rate notified under section 50(1). For this reversal, the rule specifies the period as beginning on the date the ITC was availed and ending on the date the amount added to output tax liability is paid. The start date is therefore not simply the date the 180-day period expires.
Section 50(1) sets an upper ceiling of 18% for the notified rate; that ceiling is not the applicable rate for every period. Check the notification and amendments relevant to the tax period before calculating or quoting interest. The CGST Act and Rules, as reviewed by CBIC on 3 October 2026, provide the framework; the applicable rate and facts of a particular case still need verification.
How do the main reversal grounds differ?
Do not treat every ITC reversal as a Rule 37 non-payment case. The ground determines the calculation, whether the credit can later be reclaimed, and what evidence is relevant.
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| Reversal ground | Trigger and calculation basis | Reclaim and return treatment |
|---|---|---|
| Rule 37 | Supplier consideration plus tax remains unpaid beyond 180 days from invoice date; reverse credit proportionate to the unpaid amount. | Conditional reversal that may be re-availed when applicable conditions are met; GSTR-3B Table 4(B)(2), with eligible reclaimed ITC reported under Table 4(A)(5) and Table 4(D)(1), as described by CBIC Circular 170/02/2022-GST. |
| Rules 42 and 43 | Apportionment of ITC on inputs and input services, and capital goods, attributable to exempt supplies or non-business use; prescribed calculations and any annual adjustment depend on the relevant figures and rule version. | CBIC Circular 170/02/2022-GST identifies reversals under these rules as permanent reversals reported in Table 4(B)(1); a general reclaim route is not stated in the cited circular. |
| Section 17(5) blocked credit | Credit is ineligible under the blocked-credit provision; the specific item and facts determine the issue. | CBIC Circular 170/02/2022-GST categorizes this as a permanent reversal reported in Table 4(B)(1). |
The table reflects the cited CGST framework and Circular 170/02/2022-GST. SGST/UTGST and IGST provisions, applicable state implementation, later official updates and the facts for the relevant period should also be checked. The cited material does not establish a single interest rule or calculation for every reversal ground, so do not apply Rule 37’s interest period to other grounds without a basis for doing so.
Which ITC time limit applies, and can reversed credit be reclaimed?
The 180-day Rule 37 period is a payment condition measured from the invoice date. It is distinct from the general deadline for taking ITC under section 16(4). CBIC’s sectoral FAQ states that general deadline as the due date for furnishing the September return following the end of the financial year to which the invoice or debit note pertains, or furnishing the relevant annual return, whichever is earlier.
That FAQ may predate later statutory changes and special provisions. Identify the financial year and return period, then verify the version of section 16(4) applicable to the invoice and claim; do not use the FAQ wording as a universal answer for every period.
Rule 37(4) says the section 16(4) limit does not apply to re-availing credit reversed earlier in accordance with the Act or Rules. This is an exception for qualifying re-availment, not an extension of the deadline for a first-time ITC claim. A reversal is reclaimable only if its legal ground and the conditions for re-availment permit it.
Where should reversals and reclaims go in GSTR-3B?
CBIC Circular 170/02/2022-GST distinguishes permanent reversals from conditional reversals in Table 4:
- Table 4(B)(1): Permanent reversals, including those under Rules 38, 42 and 43 and ineligible credit under section 17(5).
- Table 4(B)(2): Conditional or non-permanent reversals that may be reclaimed after the relevant conditions are fulfilled, including Rule 37 reversals and specified section 16(2) matters.
- Table 4(A)(5) and Table 4(D)(1): Eligible reclaimed ITC is reported in Table 4(A)(5), with reclaimed amounts also shown in Table 4(D)(1), as described in the circular.
Use the applicable GSTR-3B instructions and official updates at filing time. The table entry does not itself make a credit eligible for reclaim; the underlying provision and facts control that question.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What records should you keep?
The cited official rules and circular do not set out one exhaustive document checklist for every type of reversal. For a Rule 37 review, preserve records that let you establish the invoice, credit claimed, payment condition and return treatment. A practical file would normally include:
- The tax invoice and invoice date, together with the ITC amount and date it was availed.
- The value and tax payable, the amount paid, the unpaid balance and the dates of relevant payments or settlements.
- The supplier ledger, accounting entries, bank or other payment evidence, and any reconciliation explaining allocations or adjustments.
- Filed return records and workings showing the reversal, interest calculation where relevant, and any later re-availment.
This is a practical substantiation list inferred from the facts Rule 37 requires, not a universal statutory checklist prescribed for every ITC reversal. For Rules 42 and 43, retain the calculation and source data for taxable and exempt turnover, common credit, capital-goods treatment and any required adjustment. Confirm retention duties and evidence expectations for the exact ground and period with a qualified GST practitioner.
A practical review sequence
- Identify the reversal ground. Determine whether the issue is supplier non-payment, exempt or non-business attribution, blocked credit, or another provision; do not start with a generic “ITC reversal” label.
- Reconstruct the relevant dates and amounts. For Rule 37, establish invoice date, ITC availment date, supplier consideration and tax due, amounts paid, and the remaining unpaid balance.
- Apply the rule for the relevant period. Check the Act, Rules, notifications and return instructions effective for the invoice and tax period, including any special provision.
- Determine interest separately. For Rule 37, apply the specified start and end dates and verify the notified section 50(1) rate for that period; do not assume the statutory ceiling is the rate.
- Classify the reversal before filing. Decide whether it is permanent or conditional under the relevant provision, then use the corresponding GSTR-3B Table 4 treatment.
- Retain the working and supporting evidence. Keep the records that substantiate the trigger, calculation, return disclosure and any later reclaim.
For a client-specific conclusion, the decisive facts include the reversal ground, invoice and payment chronology, tax type, and the law applicable to the relevant tax period. The CBIC CGST Rules, CGST Act, sectoral FAQ and Circular 170/02/2022-GST are useful primary references, but later notifications and current GST portal instructions should be checked before filing.
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