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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteIf you claimed input tax credit (ITC) and did not pay your supplier within 180 days of the invoice date, CGST Rule 37 generally requires you to reverse the credit proportionate to the unpaid amount. Rule 37 also specifies an interest period, but the applicable interest rate depends on the rate notified under section 50(1). Other reversal grounds—such as exempt or non-business use and blocked credit—follow different rules.
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 has not paid the supplier the value of the supply plus tax within 180 days from the invoice date. The payment condition comes from the second proviso to section 16(2) of the CGST Act. This is a supplier-payment rule, not a general deadline for claiming ITC.
If only part of the amount due remains unpaid, the reversal is proportionate to that unpaid amount; it is not automatically the entire credit on the invoice. The rule also treats specified transactions as paid: certain supplies covered by Schedule I even when made without consideration, and the value attributable to amounts added under section 15(2)(b). Check the rule’s exact wording against the transaction rather than assuming every supply is treated alike. The CBIC’s CGST Rules text reviewed on 3 October 2026 sets out these conditions.
Rule 37 describes adding the relevant credit to output tax liability for the month in which the details are furnished. Its text refers to FORM GSTR-2, so read that provision alongside subsequent return-reporting instructions. For current GSTR-3B disclosure, CBIC Circular 170/02/2022-GST gives the relevant Table 4 treatment.
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How is interest calculated on a Rule 37 reversal?
Rule 37(3) says interest is payable for the period starting on the date the ITC was availed and ending on the date the amount added to output tax liability is paid. That is the period specified in Rule 37; do not substitute a different start date without legal authority and analysis of the facts.
The rate is the rate notified under section 50(1) of the CGST Act. Section 50(1) sets a maximum of 18%; that ceiling does not establish that 18% applies to every period or case. Check the notification and amendments applicable to the relevant period before quoting a rate or calculating interest. The CGST Act and Rules should also be read with applicable amendments and notifications.
Is a reversal permanent, or can you reclaim the credit?
Whether reversed ITC can be reclaimed depends on the legal ground and whether its conditions are later met. Rule 37 provides for re-availing credit previously reversed when the applicable conditions are fulfilled. This is not permission to reclaim every reversal: the underlying provision determines whether a credit is recoverable and what must happen first.
CBIC Circular 170/02/2022-GST distinguishes conditional reversals, which may be reclaimed after conditions are satisfied, from permanent reversals. Use that distinction when classifying a reversal in the return; do not infer reclaimability merely because an amount was once claimed.
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How do you report the reversal in GSTR-3B?
Under CBIC Circular 170/02/2022-GST, the reporting table depends on the nature of the reversal:
| Reversal or reclaim | GSTR-3B reporting described by CBIC Circular 170/02/2022-GST |
|---|---|
| Permanent reversal, including Rules 38, 42 and 43 reversals and ineligible credit under section 17(5) | Table 4(B)(1) |
| Conditional or non-permanent reversal, including Rule 37 and specified section 16(2) matters | Table 4(B)(2) |
| Eligible reclaimed ITC | Table 4(A)(5), with reclaimed amounts also shown in Table 4(D)(1) |
The table classification does not decide whether a particular credit is legally reclaimable; that depends on the relevant provision and facts. Circular 170/02/2022-GST was issued in 2022. Check the current form instructions and official updates at filing time.
How is the general ITC claim deadline different from the 180-day rule?
Two different clocks are easy to confuse:
- Rule 37 payment condition: payment of the supply value plus tax within 180 days from invoice issuance. A failure can require reversal of credit proportionate to the unpaid amount.
- Section 16(4) claim deadline: CBIC’s sectoral FAQ describes the 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 the date the relevant annual return is furnished, whichever is earlier.
The FAQ’s wording may predate later statutory amendments, and special provisions can affect particular tax periods. Identify the financial year and applicable law before using that general deadline. Rule 37(4) separately says the section 16(4) time limit does not apply to a qualifying re-availment of credit reversed earlier under the Act or Rules. That exception concerns eligible re-availment; it does not extend the deadline for a first-time ITC claim.
How do other common reversal grounds differ?
Rule 37 is only one reason ITC may need to be reversed. The trigger and calculation method matter: a supplier-payment shortfall is not the same as credit attributable to exempt supplies, non-business use or a statutory block.
| Ground | Trigger and calculation focus | Return treatment described in CBIC Circular 170/02/2022-GST |
|---|---|---|
| Rule 37 | Supplier value plus tax remains unpaid beyond 180 days; reverse in proportion to the unpaid amount. | Conditional reversal: Table 4(B)(2). Eligible reclaimed ITC: Table 4(A)(5) and Table 4(D)(1). |
| Rules 42 and 43 | Apportionment of ITC on inputs and input services, or capital goods, attributable to exempt supplies or non-business use. The calculation depends on the prescribed inputs, usage mix, turnover and relevant period; annual adjustments may apply. | Listed among permanent reversals reported in Table 4(B)(1). |
| Section 17(5) | Credit is blocked by statute and is therefore ineligible under that provision. | Listed among permanent reversals reported in Table 4(B)(1). |
Rules 42 and 43 are not substitutes for Rule 37, and their calculation cannot be reduced to one formula without specifying the applicable rule version, usage and period. The applicable interest treatment for a reversal should be assessed under the provision and law relevant to that ground; Rule 37’s interest wording should not automatically be applied to every type of reversal.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What records should you keep?
The CGST provisions and circulars discussed here do not establish one exhaustive document checklist for every reversal ground. For a Rule 37 review, preserve records that let you reconstruct the invoice, the credit and the payment chronology. A practical file will generally include:
- The supplier tax invoice and invoice date.
- The ITC amount and the date it was availed.
- The value and tax due, unpaid balance, and supplier ledger.
- Payment dates and supporting evidence, such as bank records or other settlement proof.
- A reconciliation showing how the unpaid proportion and any reversal were calculated.
- Filed return records and workings showing the reversal and any later eligible reclaim.
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. These are practical substantiation recommendations based on the facts the rules require, not a universal statutory checklist. Confirm record-retention requirements and evidence expectations for the exact ground and period with a qualified GST practitioner.
What should you verify before filing or calculating liability?
- Identify the reversal ground and the legal text effective for the invoice and return periods.
- For Rule 37, confirm the invoice date, when credit was availed, amounts due and paid, and the unpaid balance after 180 days.
- Check the applicable notified interest rate and amendments rather than treating the 18% statutory ceiling as the operative rate.
- Determine whether the reversal is conditional or permanent under the underlying provision, then report it in the corresponding GSTR-3B table.
- Check current return instructions and the applicable CGST, SGST/UTGST or IGST provisions for the taxpayer’s facts and jurisdiction.
The primary references are the CBIC CGST Rules, CBIC CGST Act, CBIC Circular 170/02/2022-GST and CBIC’s sectoral FAQ. The circular dates to 2022 and the FAQ may be older; consolidated online texts may also need to be checked against later notifications. For a client-specific calculation, verify the law and return instructions effective for the relevant periods.
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