What Is a Debit Note? When to Use One and How It Differs from a Credit Note

The One-Sentence Explanation

A credit note is issued by a seller to reduce what a buyer owes. A debit note is issued by a buyer to request a reduction in what they owe, or by a seller to request additional payment.

Both documents adjust invoice amounts after the fact. The difference is in who initiates them and in which direction the adjustment goes.

What Is a Credit Note? (Quick Recap)

A credit note is a document the seller sends to the buyer saying: "You owe us less than the original invoice stated." Common reasons:

Returned goods

Invoice error (overcharge)

Agreed discount after the invoice was issued

Cancelled order for partially completed work

The credit note reduces the buyer's liability. It's always issued by the seller.

What Is a Debit Note?

A debit note is a document requesting an increase in what's owed, or formally notifying that additional charges apply. It's used in two distinct situations:

Scenario 1 — Buyer issues a debit note to seller.

The buyer has been overcharged, returned goods, or found an error. Rather than waiting for the seller to issue a credit note, the buyer formally notifies the seller of the amount they expect to be credited. This is a request, not a unilateral reduction — it prompts the seller to issue a credit note.

Scenario 2 — Seller issues a debit note to buyer.

The seller has undercharged, incurred additional costs that were agreed in the contract, or needs to bill for extras not on the original invoice. The debit note is essentially a supplementary invoice — "in addition to invoice INV-2025-047, please pay the additional amount below."

When Would a Business Issue a Debit Note?

As a seller:

You issued an invoice for $500 but the correct amount was $550 due to a calculation error

Agreed price adjustment (e.g. exchange rate clause in an international contract)

Additional services requested by the client after the invoice was issued

Restocking or handling fees following returned goods

As a buyer:

You received damaged goods and want to formally request a reduction

You were charged the wrong price and want to trigger a credit note from the supplier

You're disputing part of an invoice and want a formal paper trail

Debit Note vs Credit Note: The Key Differences

Who issues it: Credit notes are issued by sellers. Debit notes can be issued by either party depending on the situation.

Effect on receivables/payables: A credit note decreases what the buyer owes. A debit note increases what the buyer owes (when issued by a seller) or requests a decrease (when issued by a buyer).

Common in: Debit notes are more common in manufacturing, wholesale, and international trade. Credit notes are universal across all business types.

GST/VAT treatment: Both affect your tax calculations. A credit note issued by a seller reduces the seller's GST liability and increases the buyer's input tax credit. A debit note issued by a seller works in reverse.

Numbering and Record-Keeping

Debit notes, like credit notes and invoices, should be:

Sequentially numbered (DN-001, DN-002…)

Clearly referencing the original invoice they relate to

Kept on file for the same retention period as invoices

Without proper numbering and cross-referencing, adjustments become impossible to trace during an audit or dispute.

Practical Example

Original invoice: INV-2025-088 for $2,000 (10 units at $200 each)

Situation: 2 units were damaged in transit. Buyer returns them and requests a reduction.

Buyer issues: Debit Note DN-2025-012 to seller, noting the 2 returned units and requesting a $400 credit.

Seller issues: Credit Note CR-2025-019 for $400, referencing both INV-2025-088 and DN-2025-012.

Net result: Buyer pays $1,600. Both parties have a complete paper trail.

This cross-referencing is essential for clean accounts and straightforward reconciliation.