GST explained
Credit Note vs Debit Note Under GST: When to Issue Each and How They Hit Your Returns
Once a GST invoice is issued, you do not edit it — you correct it with a note. A credit note brings the value or tax down; a debit note takes it up. Section 34 of the CGST Act sets when each is used and how late you can issue it, and both flow into your GST returns.
Key takeaways
- Credit note: the invoice was too high — goods returned, a price cut after sale, or deficient service.
- Debit note: the invoice was too low — a price increase, extra charges, or more goods sent than billed.
- A credit note that reduces tax must be issued by 30 November after the financial year, or the annual return date if earlier.
- Both are reported in GSTR-1 and change the tax you pay in GSTR-3B.
Credit note or debit note?
| Situation | Document | Effect on your tax |
|---|---|---|
| Customer returns goods | Credit note | Output tax reduced |
| Discount agreed after the sale (and known when selling) | Credit note | Output tax reduced |
| Rate or quantity on the invoice was too high | Credit note | Output tax reduced |
| Services found deficient | Credit note | Output tax reduced |
| Price revised upwards after the invoice | Debit note | Output tax increased |
| More goods sent than invoiced | Debit note | Output tax increased |
| Freight or other charges added later | Debit note | Output tax increased |
What a credit or debit note must show
- Name, address and GSTIN of the supplier.
- Nature of the document: credit note or debit note.
- A consecutive serial number, unique for the financial year, and the date.
- Name, address and GSTIN of the recipient.
- The original invoice number and date it adjusts.
- The taxable value, rate and amount of tax being credited or debited.
- Signature or digital signature.
The time limit for credit notes
A credit note that reduces your tax liability must be declared by 30 November following the end of the financial year in which the original supply was made, or the date of filing the annual return for that year, if earlier. A return in January for a sale made the previous June is fine; one in December for a sale two years ago is not.
There is no matching deadline for debit notes — more tax is always welcome.
Reducing tax through a credit note requires that the buyer has not taken the credit, or has reversed it. Your output tax reduction is matched against the buyer’s input credit reversal.
How they show in your returns
- GSTR-1: credit and debit notes to registered buyers are reported note by note; to unregistered buyers, as adjustments in the summary.
- GSTR-3B: the net effect reduces or increases the outward tax in Table 3.
- Your buyer: a credit note reduces the input credit in their GSTR-2B; a debit note adds to it.
Debit note from a buyer? That is a purchase return
Many businesses also call the document they send a supplier when returning goods a “debit note”. Under GST the supplier issues the credit note for the return; the buyer’s document is an internal record that the supplier owes them. Keep the two straight in your books: the supplier’s credit note is the one that changes tax.
Frequently asked questions
Can I cancel a GST invoice instead of issuing a credit note?
You can cancel an invoice before it is reported in GSTR-1 (or within 24 hours on the IRP for e-invoices). After that, use a credit note.
Is a credit note needed for a discount given on the invoice?
No. A discount shown on the invoice already reduces the taxable value. A credit note is for discounts given after the invoice.
Do I issue a credit note to an unregistered customer?
Yes, when you need to reduce the value of a supply to them; it is reported in the B2C section of GSTR-1.
About the author
Written by the TripleBill team, the people who build the billing and accounting software this site is about. We check competitor prices on their own websites on the date shown above, and we say so when our product is the weaker choice. This article is general information, not tax advice.
Read next
GST explained
GST Invoice Format: Every Mandatory Field Under Rule 46, With a Checklist
The fields a tax invoice must carry, how the invoice number has to be built, how many HSN digits you need, and when the invoice has to be issued.
22 Oct 2026 · 4 min read
GST explained
E-Way Bill Rules: When You Need One, the ₹50,000 Limit and How Long It Is Valid
The ₹50,000 rule, what counts towards it, who generates the e-way bill, how long it lasts and what happens when it runs out on the road.
22 Oct 2026 · 4 min read
GST explained
GSTR-1 vs GSTR-3B: What Each Return Holds, Due Dates and How They Connect
One return lists every sale; the other pays the tax. Here is what goes where, when each is due, and why a mismatch gets a notice.
22 Oct 2026 · 3 min read
Related pages
Returns and corrections, recorded right.
Credit and debit notes in TripleBill link to the original invoice, adjust stock and flow into GSTR-1 automatically.