Credit Note in GST: Format, Rules and Time Limit
When to issue a credit or debit note under GST, what it must show, the time limit, and how it is reported in GSTR-1.
Gaddibook Team · · 6 min read
A credit note in GST is the document you issue when the value or tax on an invoice you already issued goes down, for example because goods were returned or you gave a discount after the sale. Getting a credit note in GST right matters, because it reduces your tax liability and your buyer's input tax credit at the same time. This guide covers when to issue one, the format, the time limit and how to report it.
When should you issue a credit note?
Section 34 of the CGST Act allows a supplier to issue a credit note when:
- the buyer returns goods, fully or partly
- the taxable value charged on the invoice was higher than it should have been (for example, a wrong rate)
- the tax charged was higher than the correct tax
- the goods or services supplied were deficient
- a discount is given after the sale, as agreed before or at the time of supply
You never edit or cancel an invoice that has already been reported in GSTR-1. The credit note is how you correct it.
Credit note vs debit note
| Point | Credit note | Debit note |
|---|---|---|
| Effect on invoice value | Reduces it | Increases it |
| Typical reasons | Sales return, post-sale discount, overcharging | Undercharging, extra quantity sent, price increase |
| Effect on your GST liability | Reduces tax payable | Increases tax payable |
| Effect on buyer's ITC | Buyer must reduce ITC | Buyer can claim more ITC |
| Time limit to issue | Yes (see below) | No specific limit, but ITC time limits apply to the buyer |
Buyers sometimes issue their own "debit note" to a supplier when they return goods. Under GST, that document has no tax effect. The supplier must issue the credit note for the return to count.
What a GST credit note must contain
Rule 53 of the CGST Rules lists the required details:
- The words "Credit Note"
- Name, address and GSTIN of the supplier
- A consecutive serial number (up to 16 characters), unique for the financial year
- Date of issue
- Name, address and GSTIN of the buyer (if registered)
- Number and date of the original invoice
- The taxable value, tax rate and tax amount being reduced
- Signature or digital signature of the supplier
Keep credit notes in a separate number series from your invoices, for example CN/25-26/001.
Time limit for issuing a credit note
A credit note in GST must be declared in your returns no later than 30 November following the end of the financial year in which the original supply was made, or the date you file your annual return, whichever is earlier.
For example, for a sale made in January 2026 (financial year 2025-26), the credit note must be reported by 30 November 2026. After that, you can still give the buyer a commercial discount, but you cannot reduce your GST liability through it.
How to report a credit note in GSTR-1
Credit notes are reported in the month you issue them, not the month of the original invoice:
- Registered buyers: Table 9B, under credit/debit notes (registered), with the original invoice details.
- Unregistered buyers: Table 9B (unregistered) for inter-state supplies above the B2CL limit; otherwise the reduction is adjusted in the B2CS figures.
- Amendments: a wrong credit note is fixed through Table 9C in a later return.
The reduction then flows into your GSTR-3B, lowering the tax you pay. On the buyer's side, the credit note appears in their GSTR-2B, and they must reduce their ITC. Our guide on how to file GSTR-1 explains the other tables.
Financial credit notes (without GST)
Not every credit note changes GST. Many distributors give year-end incentives, scheme payouts or rate differences that were not agreed in the original contract. These are often issued as financial or commercial credit notes, without any GST adjustment. The supplier's tax stays the same, and the buyer keeps their full ITC.
The difference matters. A GST credit note needs the discount to be linked to specific invoices and agreed in advance. A financial credit note simply reduces the amount the buyer owes. Ask your CA which one applies to your scheme, because the wrong choice can lead to tax demands.
Examples
Sales return: A distributor sells 100 cartons at ₹1,000 each plus 18% GST. The shop returns 10 damaged cartons. The distributor issues a credit note for ₹10,000 plus ₹1,800 GST, referring to the original invoice.
Post-sale discount: A wholesaler agreed in advance to give 2% off if the shop paid within 7 days. The shop pays on day 5. The wholesaler issues a credit note for 2% of the taxable value plus GST on it.
Rate correction: An invoice was issued at 18% when the item is taxed at 5%. The supplier issues a credit note for the excess tax.
What the buyer has to do
If you are the buyer and you receive a credit note, you are not finished when you file it away. You must reduce the input tax credit you claimed on the original invoice by the GST shown on the credit note. With the Invoice Management System, the credit note appears for you to accept. Once accepted, it reduces the ITC in your GSTR-2B, and your GSTR-3B is adjusted.
Buyers should also match credit notes with their purchase returns each month. If you returned goods but the supplier has not issued a credit note, follow up quickly: until it is issued, you are still paying for goods you no longer have.
Common mistakes
- Editing the original invoice instead of issuing a credit note.
- Missing the original invoice number on the credit note.
- Reporting the credit note in the month of the original sale.
- Issuing a GST credit note after the 30 November deadline.
- Treating a buyer's debit note as if it reduced your tax.
- Using the invoice number series for credit notes.
Credit notes in Gaddibook
In Gaddibook you create a credit note directly from the original invoice, so the invoice number, buyer and items fill in automatically. Stock comes back into inventory for sales returns, the customer's balance is reduced, and the note appears in the right GSTR-1 table. See our accounting software for how it fits with your books, and how to make a GST invoice for the invoice side.
FAQ
Is a credit note mandatory for sales returns under GST?
Yes, if you want to reduce your GST liability. Without a credit note, the original invoice stays fully taxable.
What is the time limit for a credit note in GST?
It must be reported by 30 November after the end of the financial year of the original supply, or the annual return filing date, whichever comes first.
Can one credit note cover many invoices?
Yes. A single credit note can be issued against several invoices, as long as it lists the invoices it relates to.
Does the buyer need to accept a credit note?
The credit note appears in the buyer's GSTR-2B and the Invoice Management System. The buyer should accept it and reduce their ITC accordingly.
Is GST charged on a financial credit note?
No. A financial or commercial credit note does not change GST. It only reduces the amount payable between the two businesses.
