- Under the amended Section 34(2) proviso (notified via Notification No. 16/2025-CT effective 1 October 2025), credit note tax adjustments are system-linked on the GST portal.
- Suppliers can reduce their output GST liability on a credit note only if the registered recipient accepts the credit note on IMS and reverses the corresponding Input Tax Credit (ITC) in their GSTR-3B return.
- If a buyer rejects a credit note on the Invoice Management System (IMS), the tax reduction is added back to the supplier’s GSTR-3B liability.
- Businesses must align their commercial credit terms, ERP tracking, and buyer confirmation workflows.
For businesses issuing commercial or tax credit notes for sales returns, post-sale discounts, or rate adjustments, the Goods and Services Tax (GST) framework underwent a fundamental structural change on 1 October 2025. Pursuant to the Finance Act, 2025 (Act No. 7 of 2025) and Notification No. 16/2025–Central Tax amending the proviso to Section 34(2) of the CGST Act, output tax liability reduction on credit notes is now enforced directly through the GST portal’s Invoice Management System (IMS).
1. How the Credit Note Rule Changed
Position up to 30 September 2025
Previously, suppliers could reduce their output tax liability in GSTR-1 and GSTR-3B simply by reporting a GST credit note, subject to documentary evidence or a recipient declaration in the case of post-sale discount schemes to verify that the buyer had not availed excess ITC.
Position from 1 October 2025 onwards
The adjustment is now strictly system-linked through the Invoice Management System (IMS) and GSTR-2B/3B. No reduction in output tax liability of the supplier is permitted if the recipient fails to reverse the Input Tax Credit attributable to that credit note (where the recipient had previously availed such ITC).
In short, when you report a B2B credit note in GSTR-1 / IFF, it flows into your customer’s IMS dashboard. If the customer rejects the credit note on IMS, the GST portal automatically blocks your output tax reduction and reinstates the liability in your GSTR-3B.
2. Applicability
- Applies to all GST credit notes issued under Section 34(1) on or after 1 October 2025.
- Where a business issues a purely financial / commercial credit note without GST (i.e., reducing only the base price without claiming any GST output tax reduction), the supplier’s GST liability is unaffected and the buyer is not required to reverse ITC.
3. Practical Implications for Your Finance Team
- ERP & Accounts Receivable Alignment: Finance teams should track GST credit notes in a "pending buyer IMS acceptance" status before treating the GST component as settled in customer ledgers.
- Customer Coordination Before the 14th / 20th: Because buyers must accept credit notes on IMS before generating their GSTR-2B, your accounts receivable team needs a monthly cut-off to confirm that B2B customers have accepted credit notes issued to them.
- Commercial vs. Tax Credit Note Choice: For year-end turnover discounts where buyers are reluctant to reverse ITC, evaluate whether issuing a financial/commercial credit note (without GST adjustment) is cleaner operationally.
- Contract & Dealer Clauses: Dealer agreements and B2B supply contracts should stipulate that any GST loss caused by wrongful rejection of a valid credit note on IMS will be recoverable from the buyer.
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