ITC Reversal Under GST: When, Why and How Credit Must Be Reversed
Input Tax Credit (ITC) is one of the most important benefits available under GST. It allows registered taxpayers to reduce their output GST liability by claiming the tax paid on eligible business purchases.
However, ITC is not an unconditional benefit. If prescribed conditions are not fulfilled, or goods and services are used for exempt or non-business purposes, the taxpayer may have to reverse the credit. Some reversals are temporary and can be reclaimed later, while others result in permanent disallowance.
Let us understand the major ITC reversal provisions in simple terms.
1. Rule 37: Payment Not Made to the Supplier Within 180 Days
If a taxpayer claims ITC on an invoice but does not pay the supplier the value of supply along with GST within 180 days from the invoice date, the proportionate ITC relating to the unpaid amount must be reversed.
The reversal is made through GSTR-3B along with applicable interest. Once payment is made to the supplier, the taxpayer can reclaim the reversed ITC. Supplies covered under Reverse Charge Mechanism are excluded from this condition. Read Rule 37 on the CBIC Tax Information Portal.
2. Rule 37A: Supplier Has Not Filed the Corresponding GSTR-3B
Rule 37A applies where:
The supplier has reported the invoice in GSTR-1 or IFF;
The recipient has claimed ITC; but
The supplier has not filed the corresponding GSTR-3B up to 30 September following the end of the relevant financial year.
In such a case, the recipient must reverse the ITC on or before 30 November following that financial year. If the supplier subsequently files the pending GSTR-3B, the recipient may reclaim the credit.
For example, if ITC was claimed during FY 2025-26 and the supplier has not filed the relevant GSTR-3B up to 30 September 2026, the recipient must reverse it on or before 30 November 2026. Rule 37A was inserted through Notification No. 26/2022–Central Tax.
The GST Portal also calculates the Rule 37A reversal amount through the recipient’s GSTR-2B data. Therefore, taxpayers should carefully review the relevant GSTR-2B statement before filing GSTR-3B. See the GST Portal’s GSTR-2B manual.
3. Rule 38: Special ITC Option for Banks and NBFCs
Banking companies, financial institutions and NBFCs engaged in accepting deposits or extending loans and advances may choose the special ITC method prescribed under Section 17(4) and Rule 38.
Under this option, after excluding blocked credit and credit related to non-business activities, generally only 50% of the remaining eligible ITC is claimed every month. The balance credit lapses.
Once this option is exercised, it cannot be withdrawn during the remaining part of that financial year. Read Rule 38.
4. Rule 42: Common ITC on Inputs and Input Services
Rule 42 applies when inputs or input services are commonly used for:
Taxable and zero-rated supplies;
Exempt supplies; or
Business and non-business purposes.
ITC directly attributable to taxable supplies is eligible, while ITC directly attributable to exempt or non-business activities is not available. Common ITC must be divided proportionately.
A simple formula for the exempt portion is:
ITC attributable to exempt supplies = Exempt turnover ÷ Total turnover × Common ITC
A provisional calculation is made during each tax period, followed by a final adjustment for the complete financial year. Read Rule 42.
5. Rule 43: Common ITC on Capital Goods
Rule 43 applies where capital goods are used commonly for taxable as well as exempt supplies.
For this calculation, the useful life of common capital goods is taken as five years or 60 months. The monthly common credit is calculated by dividing the eligible ITC by 60, and the portion attributable to exempt supplies is reversed every month during the residual useful life.
Monthly common credit: ₹1,20,000 ÷ 60 = ₹2,000
If exempt turnover is 25% of total turnover, monthly reversal will generally be ₹500.
6. Section 17(5): Blocked Credit
Section 17(5) specifies goods and services on which ITC is not available, subject to the exceptions mentioned in the law. Common examples include certain motor vehicles, personal consumption, club membership, goods given as gifts or free samples, goods lost or destroyed, and specified construction-related expenses.
Unlike temporary reversals under Rules 37 and 37A, blocked credit is generally a permanent disallowance. If such credit has been claimed incorrectly, it must be reversed along with applicable interest consequences.
Taxpayers must examine both the blocked-credit category and its statutory exceptions before taking a final position. Refer to Sections 17 and 18 of the CGST Act on India Code.
7. Section 18(4) Read With Rule 44: Switching to Composition or Exempt Supply
A registered taxpayer must reverse ITC when:
The taxpayer switches from the regular GST scheme to the Composition Scheme; or
The taxpayer’s outward supplies become wholly exempt.
The reversal covers ITC relating to:
Inputs held in stock;
Inputs contained in semi-finished goods;
Inputs contained in finished goods; and
Capital goods held immediately before the effective date of change.
For capital goods, the amount is calculated according to their remaining useful life. After payment of the amount prescribed under Section 18(4), any balance remaining in the electronic credit ledger lapses.
Correct Reporting in GSTR-3B
Correct classification of reversal is equally important:
Permanent or non-reclaimable reversals under Rules 38, 42, 43 and Section 17(5) are generally reported in Table 4(B)(1).
Temporary reversals under Rules 37 and 37A are generally reported in Table 4(B)(2).
When temporary ITC is reclaimed, it is reported in Table 4(A)(5), with the required disclosure in Table 4(D)(1).
Taxpayers should follow the latest portal instructions while filing. See the official GSTR-3B filing guide.
Practical Compliance Checklist
Businesses should:
Maintain an invoice-wise 180-day payment ageing report.
Reconcile purchase records with GSTR-2B every month.
Monitor whether suppliers have filed their GSTR-3B.
Separate taxable, exempt, non-business and blocked credits.
Maintain a 60-month ITC register for common capital goods.
Track temporary reversals separately so that eligible credit can be reclaimed later.
Review annual Rule 42 calculations before completing year-end GST compliance.
Conclusion
ITC reversal does not always mean permanent loss of credit. Reversals under Rules 37 and 37A may be reclaimed after the prescribed conditions are fulfilled. On the other hand, blocked credit under Section 17(5) is generally not recoverable, while Rules 42 and 43 require proportionate calculations.
Regular reconciliation, supplier follow-up and proper classification in GSTR-3B can protect genuine ITC and reduce the risk of interest, notices and unnecessary disputes.
Disclaimer: This article is intended for general educational purposes. The relevant provisions, notifications and facts of each transaction should be examined before taking a tax position.
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