Debit Note in GST: Meaning, Format and Examples

A debit note in GST is the document a seller issues to increase the value of a tax invoice already raised — when the original bill was for too little, or extra tax is due. It is the mirror image of a credit note, and it raises the GST payable on that sale. This guide covers what a debit note means in GST, when a retailer issues one, the mandatory format, and how it differs from a credit note.

What is a debit note in GST?

Under GST, a seller issues a debit note when a tax invoice was raised for less than the amount actually due. The debit note records the extra value and tax, and increases the seller's output GST on that sale. Common triggers:

• The taxable value on the original invoice was too low.
• GST was undercharged on the invoice.
• A price revision after billing that increases the amount due.

Is a purchase-return note to my supplier a GST debit note?

No. When you return stock to a supplier, the GST document is the supplier's credit note to you. The "debit note" many shops send with the returned goods is a commercial note asking for that credit; it does not change GST by itself. A GST debit note is issued by the seller when the original invoice was too low (Section 34(3)).

In a billing app such as RichPOS, you enter the return to your supplier as a purchase return against the original purchase bill. Stock and the supplier's balance correct themselves, you can print the return to send with the goods, and the Tally export carries it as a debit-note voucher. The GST change still comes from the supplier's credit note.

When should a retailer issue a debit note?

Issue a debit note whenever the taxable value or tax on an original invoice needs to go up. Key points:

• It must reference the original tax invoice number and date.
• It increases your output GST liability, reported in the GST return for the period in which it is issued.
• Under Section 34, the term “debit note” includes a supplementary invoice.
• For the buyer, input tax credit on a debit note is linked to the financial year of the debit note itself (since 1 January 2021), not the original invoice (Section 16(4)).

Debit note format: mandatory fields

Debit note example

You billed a customer ₹10,000 + 18% GST but later found the correct value was ₹12,000. You issue a debit note for the ₹2,000 shortfall + ₹360 GST = ₹2,360, referencing the original invoice. Your output GST for that sale rises by ₹360, reported in that period's return.

Debit note vs credit note

Same reference, opposite direction. A debit note increases an invoice value (buyer owes more); a credit note decreases it (buyer owes less). Full breakdown in our credit note in GST guide.

How software keeps debit notes right

A debit note fails audit on small things — a missing original-invoice link, the wrong tax rate, or a broken serial sequence. A POS ties the debit note to the original bill, applies the right GST rate, and carries the extra tax into your GST summary. RichPOS handles the purchase-return side described above, but it does not create a seller's GST debit note; issue those from your accounting software or with your CA.

Related guides: Blinkit LP vs SP debit notes in GSTR-1.

Bottom line

A debit note is how you raise the value of a GST invoice already issued — when it was billed short or tax was undercharged — with the original invoice referenced and the extra GST reported in that period. It is the exact opposite of a credit note. Returning stock to a supplier? See purchases and suppliers in RichPOS.

Sources: CGST Act, Section 34; CGST Act, Section 16(4) ("invoice relating to such" omitted from 1 January 2021, Notification 92/2020-Central Tax). Checked 22 October 2026.