Debit note: what it is and when to issue one

Debit note in plain terms

An invoice went out with a figure that turned out too low.

The supplier does not cancel that invoice. It issues a debit note for the difference.

The customer records both documents. Together they show the true amount.

Buyers also use the name for a note they send a supplier to claim money back.

This guide covers the supplier's debit note under GST.

When a supplier issues one

• The price agreed was higher than the price billed.
• Extra quantity was delivered after the invoice.
• Tax was charged at a lower rate than it should be.
• Freight or packing agreed in the order was left off.
• A price revision clause in the contract took effect.

Section 34 of the CGST Act covers notes that increase the taxable value or the tax on an invoice.

Debit note or credit note

What a debit note carries

The debit note format page has a template that follows this order.

A debit note worked out

Shakti Electricals billed Om Traders for 200 LED panels at ₹1,150 each on invoice INV-2026-0402.

The agreed rate was ₹1,190. The difference is ₹40 per panel.

Om Traders now owes the invoice total plus ₹9,440.00.

The example rate of 18% is only for the figures. Confirm the rate for your goods.

How a buyer's debit note works

A buyer sometimes sends a supplier a note called a debit note.

It claims money back for short supply, damage or a rate charged too high.

Under GST the supplier then issues the credit note that changes the tax.

The buyer's note is a request. The supplier's credit note is the tax document.

Debit notes in the accounts

The supplier books the debit note as extra sales and extra output tax.

The customer books it as extra purchase and, if eligible, extra input tax.

Both sides show the debit note next to the original invoice in the ledger.

A month-end statement then shows the invoice, the note and the balance.

Collecting the difference

A debit note is still a request for money. It needs a due date.

Send it with a short WhatsApp message that names the original invoice.

«Hello Mr. Mehta. Attached is debit note DN-0014 for ₹9,440 against invoice 0402. The new rate difference is due by 30 November. Thank you.»

Common mistakes

• Cancelling the invoice instead of issuing a debit note.
• Using the invoice number series for debit notes.
• Leaving the original invoice reference out.
• Charging tax at a different rate than the original supply.
• No reason for the increase.

What a debit note is used for

In daily business the debit note answers one question. Why does the customer owe more?

• To bill a price difference after a rate revision.
• To bill extra goods sent after the invoice.
• To correct tax that was charged too low.
• To add freight, packing or insurance left off the invoice.
• To claim money back from a supplier, in its buyer's sense.

A credit note does the opposite. It lowers the amount after a return, a discount or an overcharge.

Both notes always point to an invoice that already exists.

A short definition helps. A debit note is a document that raises an invoice already issued.

A credit note is a document that lowers an invoice already issued.

Neither one replaces the invoice. Each one sits next to it in the books.

Accounting entries with figures

Take the Shakti Electricals note above for ₹9,440.00.

When Om Traders pays, it debits the Shakti account and credits the bank.

The input tax line applies only if the buyer is eligible to claim it.

Timing and the return

Issue the debit note as soon as the difference is known.

Section 34 asks the supplier to declare it in the return for the month it is issued.

Date the note on the day it is issued, not on the invoice date.

A note issued in December belongs to December even if the sale was in October.

Give the debit note its own due date. Thirty days from the note is a common choice.

Send it to the same person who received the original invoice.

Ask the customer to confirm receipt so the due date is not disputed later.

A one-line reply by email or WhatsApp is enough proof.

A second example: freight left off

Ganga Packaging sold cartons to a Jaipur exporter for ₹1,20,000 plus tax.

The order said freight of ₹6,500 would be billed. The invoice missed it.

The note quotes the order number and the original invoice. The exporter pays it with the next payment run.

Record keeping

• Number debit notes in their own series, such as DN-0001.
• File a copy with the original invoice it changes.
• Keep the order, contract or email that justifies the increase.
• Record when the customer received the note and when it was paid.
• Show the note on the next statement of account.

When the customer disputes the note

Ask the customer which line they question and why.

Send the document that supports it, such as the rate clause or the delivery challan.

If the supplier was wrong, issue a credit note to cancel the debit note.

If the customer agrees, confirm the due date in writing and send a reminder before it.

Keep every message with the note so the trail is clear later.

The debit note on the statement of account

A monthly statement shows the customer every document in date order.

The invoice of ₹2,71,400 is 200 panels at ₹1,150 plus 18% tax.

The customer paid the invoice in full. Only the debit note remains open.

A clear statement stops the customer from paying the invoice twice by mistake.

Let the reminders go out on their own

Makatea sends the reminder for the debit note on WhatsApp before its due date. When the customer pays, Makatea records it against the account. Try it free for 14 days, no card needed.