What Is a Debit Note? Debit Note vs Credit Note Explained (+ Free Template)

The document that says "you owe me more"

A delivery arrives short. A supplier undercharges on the original invoice. A buyer returns damaged goods and wants the supplier's books to reflect it. In each of these, someone needs a formal document that adjusts an amount already recorded. That document is often a debit note.

A debit note is a written notice, sent from one party to another, stating that an amount is being added to what the recipient owes (or, from the sender's own books, that a receivable is being increased). It's the "we need to charge you more" or "please reduce what we owe you" cousin of the credit note, which does the opposite.

The confusing part is that a debit note can flow in either direction. A supplier can issue one to a customer, and a customer can issue one to a supplier. Who sends it depends on whose favour the adjustment lands in. Once you fix that in your head, the rest is straightforward.

What a debit note actually does

At its core, a debit note increases the amount owed between two parties who already have a transaction on record. It references an existing invoice, corrects or supplements it, and creates an audit trail so both sets of books stay in agreement.

Common reasons a debit note gets raised:

• The original invoice undercharged. A supplier billed 100 units but priced them wrong, or forgot a delivery charge, and needs to collect the difference.
• A buyer returned goods or was short-shipped. The buyer tells the supplier: "You owe us for these returns, please issue a credit." The buyer's debit note prompts the supplier's credit note.
• Additional costs after the fact. Freight, restocking, a rush surcharge, or a price adjustment agreed after the invoice went out.
• Interest or late-payment charges. Some businesses raise a debit note to formally add late fees to an overdue account.

The key word is reference. A debit note is never freestanding. It points back to a specific invoice or purchase, so anyone auditing the account can trace exactly what changed and why.

Who issues a debit note: two scenarios

This is where most people get tangled. Work through both directions.

Scenario 1: the supplier issues it (undercharge correction)

Beacon Signage sends an invoice to a café for a window graphic:

• Design and print: £420.00
• VAT at 20%: £84.00
• Total: £504.00

A week later, Beacon realises the installation labour (£90 plus VAT) was left off. Rather than cancel and reissue, they raise a debit note for the missing amount:

• Additional installation labour: £90.00
• VAT at 20%: £18.00
• Debit note total: £108.00

The café now owes £108 more than the original invoice showed. Beacon's books record an increased receivable; the café records an increased payable. The debit note references invoice number and date so both sides reconcile cleanly.

Scenario 2: the buyer issues it (returns or short delivery)

Now flip it. A hardware retailer ordered 200 door hinges from a manufacturer and was invoiced for all 200. Twelve arrive bent. The retailer doesn't want to pay for the damaged twelve, so it raises a debit note to the supplier, saying in effect: "We are debiting your account by the value of 12 hinges. Please issue a credit note."

• 12 hinges @ £3.50: £42.00
• VAT at 20%: £8.40
• Debit note total: £50.40

Here the buyer is asserting that the supplier owes them. From the retailer's perspective, its payable to the manufacturer drops by £50.40. The manufacturer typically responds with a matching credit note, which is the document that legally reduces the supplier's tax liability in most VAT and GST systems.

That last point matters. In many jurisdictions, a buyer's debit note is a request or an internal record, but the tax adjustment is driven by the supplier's credit note. Rules vary by jurisdiction, so confirm how your tax authority treats buyer-issued debit notes before relying on one for a VAT reclaim.

Debit note vs credit note

They're mirror images. Same transaction, opposite direction.

A useful shorthand: if the correction means more money changes hands in the supplier's favour, it's a debit note. If it means less, it's a credit note. In a buyer-supplier return, the buyer's debit note and the supplier's credit note describe the same event from opposite chairs.

Debit note vs invoice

An invoice is the original demand for payment for goods or services supplied. A debit note is a supplementary adjustment to something already invoiced. The distinction affects your numbering, your records, and sometimes your tax reporting.

• An invoice creates the primary obligation. "Here is what you owe for this order."
• A debit note modifies an existing obligation. "In addition to invoice #1043, you now owe this."

Could a supplier just send a second invoice for the missed installation labour? In practice, yes, and many small businesses do. A separate invoice works fine when the extra charge is genuinely a new, standalone item. A debit note is the tidier choice when the adjustment is tied to a specific earlier invoice and you want the paper trail to show the link. If your accounting software supports debit notes, use them for corrections and keep invoices for original supplies. It keeps your invoice numbering clean and your reconciliations honest.

Debit notes and invoices also differ from a proforma invoice, which is a pre-sale estimate, and from a statement of account, which summarises all activity on an account rather than adjusting a single transaction.

What to put on a debit note

Whether you're a supplier correcting an undercharge or a buyer flagging returns, include enough for the recipient to match it to the original transaction and act on it:

• The words "Debit Note" clearly at the top
• A unique debit note number (keep a separate sequence from your invoices)
• The date issued
• Your business name, address, and tax registration number if applicable
• The recipient's name and address
• A reference to the original invoice number and date
• A clear description of the adjustment and the reason (undercharge, returned goods, additional freight, etc.)
• Quantity, unit price, and line total for each adjusted item
• Any tax (VAT / GST / sales tax) shown separately, at the correct rate
• The total amount of the debit
• A note on what happens next ("Balance now due" or "Please issue a corresponding credit note")

If tax is involved, mirror the requirements your jurisdiction imposes on invoices. In the UK a VAT-registered supplier's debit note should carry the same VAT detail as a compliant VAT invoice; in Australia the equivalent adjustment feeds into your tax invoice reporting; in Canada it affects GST/HST records; and in the US, sales tax on the adjustment follows the same rules as the original sale.

Free debit note template

Copy this into a document, or drop it into a spreadsheet. Adapt the tax line to your jurisdiction.

                          DEBIT NOTE

Debit Note No:  DN-0007            Date: 07 Aug 2026
Reference Invoice: INV-1043        Invoice Date: 22 Jul 2026

FROM:                              TO:
[Your Business Name]               [Recipient Name]
[Address]                          [Address]
[Tax Reg No.]                      [Tax Reg No.]

------------------------------------------------------------
Description                 Qty   Unit price   Amount
------------------------------------------------------------
Installation labour          1     90.00        90.00
(omitted from INV-1043)
------------------------------------------------------------
                              Subtotal:         90.00
                              VAT @ 20%:         18.00
                              TOTAL DEBIT:      108.00
------------------------------------------------------------

Reason: Installation labour was not included on the
original invoice INV-1043. This amount is now due in
addition to that invoice.

Please add this amount to the outstanding balance.
Payment terms: [e.g. Net 14 / due on receipt].

Templates like this pair naturally with the free invoice templates covered elsewhere on the site, and you can build one in the same Excel, Word, or Google Docs file you already use for invoicing.

Practical points that trip people up

Keep the numbering separate. Don't slot debit notes into your invoice sequence. A prefix such as DN- keeps them distinct and makes year-end reconciliation faster.

Match debit notes to credit notes on returns. When you issue a debit note to a supplier, chase the matching credit note. Without it, your payable and their receivable drift apart, and the tax position may not be valid. The credit note is usually the document that carries the tax weight.

Don't use a debit note to hide a mistake. If you got a price badly wrong, say so plainly in the reason field. Vague debit notes invite disputes and slow payment. Clarity gets you paid faster, the same logic behind getting invoices paid faster generally.

Watch the timing on tax periods. An adjustment raised in a later tax period can shift when the tax is accounted for. If a debit note crosses a VAT or GST quarter boundary, note which return it belongs in.

Retention. Treat debit notes like invoices for record-keeping. File them with the original transaction and hold them for the period your jurisdiction requires, as covered in how long to keep invoices and receipts.

Used well, a debit note is a small piece of admin that prevents a much larger headache: two businesses whose ledgers quietly disagree about who owes what. Reference the original invoice, state the reason plainly, get the tax right, and both sides stay in sync.