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Credit & Debit Notes

Credit notes and debit notes under GST: when and how to issue them

March 10, 2026
3 min read

No matter how careful you are, invoicing mistakes happen. In GST, you cannot simply edit an issued invoice. You must issue a credit note or debit note to correct the record.

Credit notes and debit notes are not just accounting adjustments — they are legal GST documents that affect your tax liability and your buyer's input tax credit.

This guide explains when to issue credit notes vs debit notes, what they must contain, and how to report them in your GST returns.

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What is a credit note and when to issue one

  • Definition: A credit note is a document issued by the supplier to reduce the taxable value and/or GST charged in an earlier invoice.
  • Situation 1: Goods returned by buyer: If the buyer returns goods, issue a credit note for the returned quantity and value.
  • Situation 2: Post-sale discount: If you agree to a discount after invoicing, issue a credit note for the discount amount.
  • Situation 3: Invoice error (overcharge): If you charged more than the agreed price, issue a credit note for the excess amount.
  • Situation 4: Services not fully rendered: If you invoiced for services but could not complete them, issue a credit note.
  • Effect: The credit note reduces your GST liability in the month it is issued and reduces the buyer's ITC claim.

What is a debit note and when to issue one

  • Definition: A debit note is a document issued by the supplier to increase the taxable value and/or GST charged in an earlier invoice.
  • Situation 1: Invoice error (undercharge): If you charged less than the agreed price, issue a debit note for the shortfall.
  • Situation 2: Additional charges post-invoice: If additional costs were not included in the original invoice, issue a debit note.
  • Situation 3: Goods/services additional delivery: If you delivered more goods or rendered additional services, issue a debit note.
  • Situation 4: Interest on delayed payment: If your contract allows charging interest on overdue invoices, issue a debit note.
  • Effect: The debit note increases your GST liability in the month it is issued and increases the buyer's ITC claim.

Mandatory details in a credit/debit note

  • Heading clearly stating 'Credit Note' or 'Debit Note': This distinguishes it from a regular invoice.
  • Name, address, and GSTIN of supplier: Same as on the original invoice.
  • Name, address, and GSTIN of recipient: Same as on the original invoice.
  • Credit/Debit Note number: Unique consecutive number for the financial year, separate from your invoice series.
  • Credit/Debit Note date: The date of issue.
  • Original invoice reference: The invoice number and date being adjusted.
  • Reason for issue: 'Goods returned', 'Post-sale discount', 'Invoice correction', etc.
  • Value of supply: The amount being adjusted (before GST).
  • GST rate and amount: The GST being adjusted, split as CGST/SGST or IGST.
  • Signature: Physical or digital signature of the supplier.

Time limits for issuing credit notes

  • The September deadline: Credit notes must be issued on or before the 30th of September following the end of the financial year.
  • OR before filing annual return: Whichever is earlier — September 30 or the date of filing the annual return (GSTR-9).
  • Example: For an invoice dated March 15, 2026, you must issue any credit note by September 30, 2026.
  • Consequence of delay: If you miss this deadline, you cannot adjust the GST liability for the original period.
  • No time limit for debit notes: Debit notes can be issued at any time.

Reporting credit and debit notes in GST returns

  • GSTR-1 reporting: Credit notes and debit notes are reported in a separate table in GSTR-1, linked to the original invoice details.
  • Buyer impact: The buyer must adjust their ITC claim in GSTR-3B based on the credit/debit note received.
  • Matching in GSTR-2B: Credit notes issued by you appear in your buyer's GSTR-2B.
  • E-invoicing: If the original invoice was e-invoiced, the credit/debit note must also be registered on the IRP portal.
  • Annual reconciliation: At year-end, ensure all credit notes and debit notes are properly linked to original invoices.

Common mistakes with credit and debit notes

  • Mistake 1: Editing the original invoice: Never edit an issued invoice. Always issue a credit note or debit note.
  • Mistake 2: Missing the September deadline: Track all potential credit note situations and issue them before the deadline.
  • Mistake 3: Wrong GST rate on adjustment: The credit/debit note must use the same GST rate as the original invoice.
  • Mistake 4: Not linking to original invoice: Always reference the original invoice number and date.
  • Mistake 5: Using the same series as invoices: Maintain separate number series for credit notes and debit notes.

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