What Is a Credit Note? When and How to Issue One

You've invoiced a client, they've queried the amount, and it turns out you overcharged. Or they returned half an order. Or you agreed a goodwill discount after the invoice went out. Whatever the reason, you can't just edit the invoice — it's already in their system, possibly already paid. What you need is a credit note.

What a Credit Note Actually Does

A credit note (sometimes called a credit memo) is a document that reduces or cancels the amount a customer owes on an invoice you've already issued. Think of it as the opposite of an invoice: an invoice adds to what the customer owes; a credit note takes some, or all, of it back.

You generally don't delete or quietly edit an invoice once it's gone out. An invoice is a numbered accounting record, and changing it after the fact breaks your audit trail. Instead, you keep the original invoice on record and issue a separate credit note that offsets it. (Some systems also let you cancel the original and issue a corrected invoice — the point is the change is documented, not hidden.)

When to Issue a Credit Note

A credit note is the right tool whenever the amount on an issued invoice needs to come down. Common situations:

If the customer hasn't paid yet, the credit note simply reduces what they owe. If they've already paid, the credit note creates a balance you either refund or carry forward against their next invoice.

What to Put on a Credit Note

A credit note looks much like an invoice, with a few differences. Include:

Your business details and the customer's details (same as the invoice); a clear label — the words "Credit Note" so it can't be mistaken for an invoice; a unique credit note number from its own sequence (CN-2026-001, not your invoice sequence); the issue date; and a reference to the original invoice number it relates to.

Then list the items being credited, with the amount shown clearly as a credit. If the original invoice included tax, the credit note must show the tax being reversed too.

Keep credit notes in their own sequential series, distinct from invoice numbers, so both sequences stay clean and auditable. See our invoice numbering guide.

Credit Notes and VAT / GST

This is where credit notes matter most. If you're registered for VAT or GST and the original invoice charged tax, the credit note has to reverse the right amount of tax — otherwise your tax return won't reconcile.

In the UK, a VAT credit note should reference the original invoice, show the VAT being credited, and generally be issued within HMRC's time limits (which depend on the circumstances); it then adjusts the VAT you account for in the relevant period. Australia and Canada have similar adjustment mechanisms, but the document name (Australia uses an "adjustment note"), the required contents, and the reporting timing differ.

One thing that catches people out: writing off or deleting a tax invoice instead of issuing a credit note leaves the original VAT/GST on record with nothing to offset it. Always credit, don't delete.

The exact timing rules and limits differ by country and situation, so if a credit note crosses a tax period or involves a large adjustment, confirm the treatment with your accountant or local tax authority.

Credit Note vs Refund vs Debit Note

These get mixed up, so to be clear: a credit note reduces what a customer owes. A refund is the actual movement of money back to them — you might issue a credit note and then refund against it, or carry the credit forward. A debit note goes the other way: it's typically raised by a customer (or sometimes a supplier) to indicate an amount owed, often to request a credit note in return.

For most freelancers and small businesses, the pattern is simple. Something on an invoice was too high, so you issue a credit note, and either refund the difference or knock it off the next bill.

How to Issue One Quickly

You can adapt any of our templates into a credit note: label it clearly, give it its own number, reference the original invoice, and show the credited amounts and tax. Start from the invoice generator or a relevant industry template and adjust the heading and notes.

A common follow-up question: what's the difference between a credit note and an invoice? An invoice increases the amount a customer owes you; a credit note reduces or cancels it. Rather than quietly editing or deleting a sent invoice, you keep the original on record and issue a separate, numbered credit note that offsets it, so the change is documented.

Another one: does a credit note mean a refund? Not necessarily. If the customer hasn't paid, it simply lowers their balance. If they've already paid, you can either return the money or carry the credit forward against their next invoice. The refund is the separate act of returning the funds — it's triggered by the credit note, not synonymous with it.

Frequently asked questions

How do credit notes affect VAT or GST?

If the original invoice charged tax, the credit note must reverse the corresponding tax, and that adjustment flows through to your VAT/GST return for the relevant period. Reference the original invoice on the credit note. Because timing rules vary by country, check with your tax authority or accountant for large or period-crossing adjustments.

Should a credit note have its own number?

Yes. Use a separate sequential series for credit notes (e.g. CN-2026-001), distinct from your invoice numbers, and reference the original invoice number on the credit note. This keeps both sequences clean and auditable.