GST Credit Note and Debit Note Rules 2026: Section 34 and Format

A credit note and a debit note correct different invoice situations. A credit note can record an overcharged taxable value or tax, returned goods, or deficient goods or services under Section 34. A debit note is used when the taxable value or tax in the original invoice was lower than it should have been. Both are issued by the supplier under Section 34; the buyer should not create a supplier’s GST note in the supplier’s place.

Quick answer: Issue the note with a unique document number, date and link to the original invoice. Report a credit note in the return for its issue period and, if reducing output tax, meet the statutory deadline: the earlier of 30 November following the financial year of the original supply or furnishing the relevant annual return. A commercial adjustment may still be recorded after that cut-off, but the supplier cannot use it to reduce GST output tax after the statutory window.

When to issue a credit note

Section 34(1) permits a supplier to issue a credit note where the taxable value or tax charged in the original tax invoice exceeds the amount payable, goods are returned, or goods or services are deficient. The provision also includes specified post-supply discounts where the conditions in Section 15(3)(b) are satisfied.

Examples of the established Section 34 grounds include:

• the invoice used a higher taxable value or tax amount than the supply requires;
• a customer returns goods covered by the original invoice;
• the goods or service supplied are deficient.

For a post-supply discount, do not assume that a credit note can reduce output tax. Check the Section 15 conditions and the currently effective Section 34 wording. The Finance Act 2026 inserted an express discount reference in Section 34(1), but the CBIC consolidated text marks that insertion as “yet to be notified” as of 25 September 2026.

If the adjustment does not meet the conditions for a GST credit note that reduces output tax, a supplier may need a commercial or financial credit note instead. That can adjust the amount payable between parties without automatically changing the supplier’s GST liability. Document which kind of note is being issued and why.

When to issue a debit note

Under Section 34(3), a supplier issues a debit note when the taxable value or tax charged in the original invoice is less than the taxable value or tax payable for that supply. For example, the supplier may discover that a quantity, taxable value or applicable tax amount was understated.

Report a debit note in the prescribed return for the period in which it is issued. The buyer’s ability to claim any additional input tax credit is a separate matter and remains subject to Section 16, its time limit, supplier reporting and other ITC conditions. Do not treat a debit note as automatic proof that the recipient can claim credit.

Section 34 time limit for a credit note

Section 34(2) requires the supplier to declare a credit note in the return for the month in which it is issued, and no later than the 30th day of November after the end of the financial year in which the original supply was made, or the date the relevant annual return is furnished, whichever is earlier. The supplier must also satisfy the statutory conditions for reducing output tax, including the recipient-side reversal condition where the recipient is registered.

For example, for a supply made in FY 2025–26, the ordinary outer date under this wording is 30 November 2026, unless the relevant annual return is furnished earlier. Verify the applicable section text and current portal process for the transaction.

The CBIC’s consolidated Section 34 text currently also records a 2026 Finance Act insertion concerning discounts under Section 15(3)(b) as “yet to be notified.” Check for a commencement notification before treating that insertion as operative. This guide follows the provisions effective as of 25 September 2026.

Particulars to include

Rule 53(1A) of the CGST Rules prescribes particulars for a credit or debit note. Prepare a note that includes, as applicable:

• supplier’s name, address and GSTIN;
• the document’s nature, a unique consecutive serial number for the financial year and issue date;
• recipient’s name, address and GSTIN, if registered;
• the serial number and date of the corresponding tax invoice or bill of supply;
• the taxable value, tax rate and tax amount credited or debited, where relevant; and
• the supplier’s signature or digital signature, subject to the rules for electronic documents.

Your accounting record should also explain the reason, identify the original supply, show the before-and-after values, and make clear whether the note changes GST liability or is only a commercial adjustment. The Credit/Debit Note Generator can help lay out the arithmetic; it does not decide whether a GST adjustment is legally allowed or whether a return deadline has been met.

A simple example

Suppose a supplier issued an invoice for a taxable value of ₹1,00,000 plus ₹18,000 GST. A later reconciliation shows that the correct taxable value was ₹90,000 at the same assumed 18% rate. A credit note for the ₹10,000 taxable-value difference and ₹1,800 tax difference may be considered, but the supplier must still meet Section 34 and Section 15 conditions before reducing output tax. If the supplier instead undercharged the original taxable value, a debit note may be needed for the additional taxable value and applicable tax.

Use the HSN/SAC Lookup to research a classification, then verify the rate against the current official notification. A code lookup alone does not decide the transaction’s tax treatment.

Practical issue-and-report workflow

1. Find the original invoice and establish what was actually supplied, returned, deficient or discounted.
2. Decide whether the correction is a GST credit/debit note under Section 34 or a commercial-only adjustment.
3. Calculate the taxable-value and tax difference using the applicable rate and supply type.
4. Issue the numbered document with Rule 53 particulars and a clear cross-reference to the original invoice.
5. Report the note in the correct return period; for a tax-reducing credit note, check Section 34’s deadline and recipient reversal condition.
6. Reconcile the supplier’s return, the buyer’s records and the electronic invoice/IMS data where applicable.

Common questions

Can I issue a credit note after 30 November?

You may need a commercial document to record a later price adjustment, but after the Section 34(2) deadline the supplier cannot use that credit note to reduce output tax for the original supply. Check whether the annual return was furnished earlier, because the earlier date controls.

Is a GST credit note the same as a commercial credit note?

No. A GST credit note intended to reduce output tax must meet Section 34 and related conditions. A commercial or financial credit note can adjust the amount between parties without necessarily reducing GST liability.

Who issues a GST credit or debit note?

The supplier who issued the original invoice issues the Section 34 note. The recipient records the corresponding document and makes any required ITC adjustment.

Is there a statutory deadline to issue every debit note?

Section 34(4) requires reporting a debit note in the return for the month in which it is issued. The recipient’s ITC claim is separately subject to the Section 16 rules and applicable time limits.

Does a credit note always reduce the supplier’s output GST?

No. The basis for the note, statutory deadline, recipient ITC reversal and other Section 34 conditions must be satisfied. A commercial adjustment alone does not guarantee an output-tax reduction.

Official sources

• CGST Act, Section 34 — Credit and debit notes.
• CGST Rules, including Rule 53(1A).
• CGST Act, Section 15 — Value of taxable supply.

This guide is general information, not a substitute for reviewing the invoice, return period and applicable tax treatment with a qualified professional.