A credit note in GST is the document a registered supplier issues to reduce the value or tax of an invoice already raised, for a sales return, an excess charge or a deficient supply. Under Section 34 of the CGST Act, it reduces your output tax only if you declare it in a return by 30 November after the financial year of the original supply, or by the annual return date if that is earlier.
For every FY 2025-26 sale, that means 30 November 2026. A return or rate correction you document after that date can still be settled commercially, but it no longer brings your GST down. Since 1 October 2025 there is a second condition as well: where the buyer is registered, your tax falls only if the buyer reverses the matching input tax credit (ITC).
Point | Position |
|---|---|
Who issues it | The registered supplier, never the buyer (Section 34(1), CGST Act) |
Grounds | Taxable value or tax charged exceeds what was payable, goods returned, or the supply was deficient |
Reported in | GSTR-1 for the month or quarter of issue (credit and debit note table) |
Outer time limit | 30 November after the financial year of the supply, or the annual return date if earlier (Section 34(2)) |
FY 2025-26 cut-off | 30 November 2026 |
Buyer condition | Supplier's reduction allowed only if a registered buyer reverses attributable ITC (proviso to Section 34(2), substituted by Section 126 of the Finance Act, 2025, in force from 1 October 2025) |
Buyer's portal action | Accept, reject or keep pending in IMS; pending allowed for one tax period from the October 2025 period (GSTN Advisory No. 631, 17-10-2025) |
When a credit note in GST is required
Section 34(1) allows a credit note in three situations: the taxable value or tax on the invoice was higher than it should have been, the buyer returned the goods, or the goods or services were found deficient. A discount agreed after the sale qualifies only if it meets the conditions of Section 15(3)(b), which links it to specific invoices.
A credit note is not a way to fix a typing error before the invoice is reported. If the invoice has not yet gone into GSTR-1, correct the invoice. Once it is reported, the credit note or an amendment is the only route.
The 30 November credit note time limit
The time limit runs from the financial year of the original supply, not the date of the return. A March 2026 sale returned in October 2026 still belongs to FY 2025-26, so its credit note must reach GSTR-1 by 30 November 2026.
Original sale | Return or correction | Last return to declare the credit note | GST reduced? |
|---|---|---|---|
February 2026 | September 2026 | GSTR-1 filed by 30 November 2026 | Yes, if declared in time |
March 2026 | November 2026 | GSTR-1 for November 2026, if filed by 30 November 2026 | Only if filed by the 30th |
March 2026 | December 2026 | Too late for FY 2025-26 | No; issue a financial credit note |
The trap is the "whichever is earlier" clause. If you file the FY 2025-26 annual return in October, the window closes on that filing date, not on 30 November. File GSTR-9 after your last credit notes for the year are in.
Why the buyer's ITC reversal now decides your tax
From 1 October 2025, the proviso to Section 34(2) bars a supplier from reducing output tax on a credit note unless the registered recipient has reversed the ITC attributable to it. Before this change, the supplier's reduction stood on its own, even when the buyer kept the credit.
On the portal this plays out in the buyer's Invoice Management System (IMS). According to GSTN Advisory No. 631 dated 17-10-2025, from the October 2025 tax period a buyer can keep a credit note pending for one tax period, and on acceptance can declare the actual ITC to be reduced, instead of the full tax amount reversing automatically. A rejected credit note does not reduce the buyer's credit, and your reduction is exposed.
Call your B2B customers before you file a large credit note. A buyer who rejects it, or leaves it pending until the window closes, can undo your tax saving without telling you.
Credit notes for marketplace returns and B2C buyers
Most marketplace returns come from consumers who are not registered, so there is no ITC to reverse and the Finance Act, 2025 condition does not bite. You still need a credit note in your books for every return, because the sale and the return must both be traceable when an officer compares GSTR-1 with your sales records.
Two figures move when a marketplace order is returned. Your output tax falls through the credit note, and the operator's TCS falls because Section 52 levies TCS on the net value of supplies after returns. If your GSTR-1 shows the return but the operator's GSTR-8 does not, the TCS credit you receive will not match your sales; our guide to the e-commerce operator under GST explains that filing.
How to issue and report a credit note step by step
Issue the credit note with the particulars Rule 53 prescribes, then follow this sequence:
Number it in its own series, separate from tax invoices, and date it the day you issue it.
Quote the original invoice number and date, and the reason: return, excess value or deficiency.
Show the taxable value and each tax head being reduced, at the rate on the original invoice.
If your aggregate turnover requires e-invoicing, generate an IRN for the credit note as you would for an invoice.
Report it in GSTR-1 for the period of issue; a B2B note appears in the buyer's IMS.
For a B2B note, confirm with the buyer that it was accepted in IMS and the ITC reversed.
Check that GSTR-3B for the same period shows the reduced liability, then file.
E-invoicing has applied to businesses above ₹5 crore aggregate turnover since 1 August 2023 (Notification No. 10/2023-Central Tax, dated 10-05-2023), and it covers credit notes as well; see our e-invoicing services if you have crossed that line.
Financial credit notes after the deadline
A financial or commercial credit note settles a commercial claim without touching GST. It is what you issue after 30 November for an FY 2025-26 sale, or for a discount that fails Section 15(3).
According to CBIC Circular No. 251/08/2025-GST, dated 12-09-2025, a financial credit note does not reduce the original transaction value, so the supplier's tax stays as charged and the buyer need not reverse ITC on it. Label it clearly as "not a credit note under Section 34" so nobody reports it in GSTR-1 by mistake.
What a late credit note costs
Missing the cut-off costs the full GST on the reversed value. On a ₹4,00,000 return of goods taxed at 18%, a credit note declared on 1 December instead of 30 November leaves ₹72,000 of output tax that can no longer come down.
The cost is clearest for marketplace sellers with high return rates. At Complylocal, the late credit notes we see most often belong to sellers who post returns in their books from the marketplace's return report but leave the credit notes for the year-end GSTR-1 clean-up. By then, March and February returns are already past the window.
Book credit notes in the same month as the return, and reconcile them against GSTR-1 before every filing, as part of your monthly GST reconciliation.
Credit note versus debit note
A debit note increases the value or tax of an invoice; a credit note reduces it. The two are treated very differently under Section 34.
Point | Credit note | Debit note |
|---|---|---|
Effect | Reduces taxable value and tax | Increases taxable value and tax |
Outer time limit | 30 November after the financial year, or annual return date if earlier | No outer limit; declare in the return for the month of issue |
Buyer condition | Registered buyer must reverse ITC for supplier's reduction | Buyer can claim ITC on it, subject to Section 16 |
Interest risk | Late note means tax stays payable | Late note means tax was short-paid, with interest |
Our overview of GST return types shows where both appear across GSTR-1, GSTR-3B and GSTR-9.
Want credit notes, returns and GSTR-1 kept in step every month? Talk to Ankush's team about e-commerce GST return filing and compliance.
Mistakes that cost sellers their credit note
Sellers lose credit notes in predictable ways:
Waiting for the year-end clean-up, which pushes February and March returns past 30 November.
Filing GSTR-9 before the last credit notes for the year, which closes the window early.
Issuing a credit note at today's GST rate instead of the rate on the original invoice.
Treating a marketplace's own "credit note" for fee refunds as a sales return; that note reduces your purchase ITC, not your output tax.
