A credit note under GST is issued by a supplier under Section 34 of the CGST Act when the taxable value or tax on an invoice was too high, goods are returned, or goods or services are found deficient. It must be declared in the return by 30 November after the financial year of supply or the annual return date, whichever is earlier.
Sales do not always go to plan. Goods come back, a rate is billed too high, a customer finds part of a shipment damaged. Under GST, the way to correct an invoice downwards is a credit note, issued under Section 34 of the CGST Act.
This guide explains when you can issue a GST credit note, what it must contain, how it flows through returns, the deadline that catches many businesses out, and the condition that your buyer must reverse credit before you get the benefit. The opposite case, where the invoice was too low, is covered in debit note under GST.
When can you issue a credit note under GST?
Section 34(1) lists the situations. A supplier may issue a credit note when, after a tax invoice has been issued:
- The taxable value charged is higher than the actual taxable value of the supply
- The tax charged is higher than the tax actually payable
- Goods supplied are returned by the recipient
- Goods or services supplied are found to be deficient
The Finance Act, 2026 inserted a reference to discounts covered by Section 15(3)(b) into Section 34(1); as per the CBIC text, that insertion's effective date was yet to be notified when this guide was checked.
A credit note is the supplier's document. It always relates back to one or more original tax invoices.
What a GST credit note must contain: Rule 53(1A)
| Clause | Particular |
|---|---|
| (a) | Supplier name, address and GSTIN |
| (b) | Nature of the document ("Credit Note") |
| (c) | Consecutive serial number, max 16 characters, unique for the financial year |
| (d) | Date of issue |
| (e) | Recipient name, address and GSTIN/UIN if registered |
| (f) | For unregistered recipients: name, address, delivery address, state name and code |
| (g) | Serial number(s) and date(s) of the corresponding invoice(s) or bill(s) of supply |
| (h) | Taxable value, rate of tax and amount of tax credited |
| (i) | Signature or digital signature of the supplier or authorised representative |
Give credit notes their own series (for example CN/26-27/0001) so they are easy to report. See GST invoice number series rules.
What is the time limit for issuing a credit note?
Section 34(2) says the credit note must be declared in the return for the month in which it is issued, but not later than 30 November following the end of the financial year in which the supply was made, or the date of furnishing the relevant annual return, whichever is earlier. The 30 November date applies from 1 October 2022; earlier it was September.
Example: for a supply made in FY 2025-26 (any date from 1 April 2025 to 31 March 2026), the last date is 30 November 2026, unless you file the FY 2025-26 annual return earlier, in which case that earlier date is the cut-off.
| Supply made in | Latest date to declare credit note |
|---|---|
| FY 2025-26 | 30 November 2026, or annual return date if earlier |
| FY 2026-27 | 30 November 2027, or annual return date if earlier |
Why does the buyer's ITC reversal matter?
The proviso to Section 34(2), substituted with effect from 1 October 2025, says the supplier gets no reduction in output tax liability if:
- the recipient is registered and has availed the input tax credit attributable to the credit note but not reversed it; or
- in other cases, the incidence of tax has been passed on to any other person.
In plain words: a credit note reduces your tax only if your registered buyer reverses the matching credit. The two sides must line up. Talk to your buyer, share the credit note promptly, and keep evidence of their acceptance.
How does a credit note flow through GST returns?
- Issue the credit note with the required particulars and link it to the original invoice(s).
- E-invoice taxpayers: report it to the IRP and obtain an IRN; taxpayers with aggregate annual turnover of ₹10 crore and above must do this within 30 days of the document date.
- Report in GSTR-1 for the month (or quarter, under QRMP) of issue, in the credit/debit notes section, registered or unregistered as applicable.
- Buyer's side: it appears in the buyer's GSTR-2B as a credit note, and the buyer reverses the corresponding credit.
- Your GSTR-3B: the net outward liability reflects the reduction.
Credit notes are not amendments of the original invoice. The original stays as it is; the credit note sits alongside it. If the original invoice was wrong in a way a credit note cannot fix (for example, wrong GSTIN), the route is an amendment in GSTR-1 instead. Return mechanics are in GSTR-1 filing guide.
Worked example: sales return with partial damage
A Coimbatore pump manufacturer sells to a registered dealer in Madurai (intra-state, Tamil Nadu) on invoice INV/26-27/00812 dated 10 July 2026:
- 20 monoblock pumps at ₹7,500 each = ₹1,50,000 taxable
- CGST 9% = ₹13,500; SGST 9% = ₹13,500
- Invoice total = ₹1,77,000
On 2 August 2026, the dealer returns 3 pumps with cracked casings.
Credit note CN/26-27/0041, dated 2 August 2026
- Reference: INV/26-27/00812 dated 10 July 2026
- Taxable value = 3 × 7,500 = ₹22,500
- CGST 9% = ₹2,025; SGST 9% = ₹2,025
- Credit note total = ₹26,550
The manufacturer reports the credit note in its August GSTR-1. The dealer sees it in GSTR-2B and reverses ₹4,050 of credit (₹2,025 + ₹2,025). The manufacturer's August output tax falls by ₹4,050.
Rate error variant. Suppose instead the pumps had been invoiced at 40% (CGST 20% + SGST 20%) because of a wrongly mapped item code, when the correct rate was 18%. Excess tax = 1,50,000 × 22% = ₹33,000. A credit note for the excess tax (₹16,500 CGST and ₹16,500 SGST, referencing the original taxable value) corrects it, provided the dealer reverses the excess credit it took. You can confirm amounts with the GST calculator.
Worked example: deficiency in services across several invoices
A Bengaluru facility-services firm bills a registered office complex in Hyderabad (inter-state, so IGST) for monthly housekeeping:
| Invoice | Date | Taxable value | IGST 18% |
|---|---|---|---|
| INV/26-27/00101 | 31 May 2026 | ₹2,40,000 | ₹43,200 |
| INV/26-27/00167 | 30 June 2026 | ₹2,40,000 | ₹43,200 |
| INV/26-27/00233 | 31 July 2026 | ₹2,40,000 | ₹43,200 |
The contract has a service-level clause: if attendance falls below an agreed level, the monthly fee drops by 5%. After a quarterly review in August, both sides agree attendance fell short in all three months.
- Reduction per month = 5% of ₹2,40,000 = ₹12,000
- Total taxable reduction = 3 × 12,000 = ₹36,000
- IGST reversed = 36,000 × 18% = ₹6,480
- One credit note total = ₹42,480
Because Section 34(1) allows one or more credit notes against one or more invoices for supplies in a financial year, the firm can issue a single credit note listing all three invoice numbers and dates, as Rule 53(1A)(g) requires. It is reported in the firm's GSTR-1 for the month of issue, and the office complex reverses ₹6,480 of IGST credit.
If one of these invoices had related to the previous financial year, it would need to go on a separate credit note, and the 30 November cut-off for that earlier year would apply to it.
How should you handle a credit note on the buyer's side?
Credit notes are a two-party process, and the proviso to Section 34(2) makes the buyer's action decisive. A simple routine helps both parties:
- Share the credit note immediately, by email or WhatsApp, with the original invoice reference.
- Ask the buyer to confirm they have booked it and reversed the credit in their return.
- Match monthly. Compare your credit notes in GSTR-1 with what the buyer has accepted. Unmatched credit notes are the ones most likely to be questioned.
- Keep the evidence, such as the buyer's confirmation or a ledger statement, with your credit note file.
For buyers, the lesson runs the other way: a credit note from your supplier reduces your eligible credit, so book it in the same period it appears in GSTR-2B. Reconciliation is explained in GSTR-2B reconciliation.
Credit note vs revised invoice vs amendment
| Situation | Right tool |
|---|---|
| Value or tax charged too high, goods returned, deficiency | Credit note under Section 34 |
| Registration granted with retrospective effect; invoices issued in the gap | Revised invoice under Section 31(3)(a) |
| Wrong GSTIN, wrong invoice number, wrong place of supply in a return | Amendment in GSTR-1 |
| Value or tax charged too low | Debit note |
The revised-invoice route has a narrow meaning in GST law; see revised invoice under GST.
Common mistakes
- Missing the 30 November cut-off for credit notes on the previous year's supplies.
- Not quoting the original invoice number and date.
- Issuing a GST credit note for a commercial discount that does not meet Section 15(3)(b). Use a financial credit note without GST instead.
- Assuming the tax reduction is automatic. It depends on the buyer reversing credit.
- Forgetting the IRN on credit notes when you are an e-invoice taxpayer.
- Numbering credit notes in the invoice series.
- Using a credit note to change the buyer on an invoice. That needs a GSTR-1 amendment or a cancellation and fresh invoice, not a credit note.
Key takeaways
- Credit notes correct an invoice downwards: excess value or tax, returns, or deficient supplies.
- Rule 53(1A) lists nine particulars, including the original invoice reference.
- Declare by 30 November after the year of supply, or the annual return date if earlier.
- Your tax reduction depends on the registered buyer reversing matching credit.
- E-invoice taxpayers need an IRN for credit notes too.
Billing Software by Betterwork creates credit notes from the original invoice in one click, carries the invoice reference automatically, and includes them in GSTR-1 exports.
This guide is general information, not tax advice. Rules last checked on 20 October 2026; confirm with your tax professional for your situation.