Credit Memo: What It Is and When to Issue One

2026-11-12

A credit memo is a document a seller issues to reduce what a customer owes. It is used when an invoice was too high: goods were returned, a price was wrong, or part of the work was cancelled. It keeps the original invoice intact and records the correction, so your books still show a clear history.

You may also see it called a credit note or a credit memorandum. They mean the same thing. "Credit memo" is more common in the US, and "credit note" in Canada and the UK.

Why not just edit the invoice?

Once an invoice has been sent, it is a business record. Your client may already have booked it, your books already count it, and your numbering depends on it. Changing it after the fact makes your records unreliable, and an auditor or accountant will want to know why.

A credit memo leaves the trail intact. Anyone reading the account later sees the invoice, the correction and the reason.

When to issue a credit memo

• Returns. A customer sends goods back or cancels part of an order.
• Pricing errors. You billed 1,200 when you agreed 1,000.
• Overbilling. You charged too many hours or units.
• Duplicate invoices. The same work was invoiced twice.
• Service problems. You agree to reduce the bill after something went wrong.
• Cancelled work. A client cancels part of a project already billed.
• Discounts agreed after invoicing.

If nothing has been sent yet, you do not need one. Fix the draft. And if an unpaid invoice was simply wrong from top to bottom, your software may let you void it, which is often cleaner. Ask your accountant which they prefer.

What to include on a credit memo

Keep the reason specific. "Credit for 4 hours billed twice on invoice 1042" will still make sense in a year. "Adjustment" will not.

A worked example

You invoice a client 1,000 plus 80 tax, for a total of 1,080, in whatever currency you bill. The client returns or disputes 200 of the work, and you agree to reduce it.

You issue a credit memo for 200 plus 16 tax, a total of 216. The client now owes 864.

On your books, the original invoice recorded:

The credit memo records the opposite:

Your receivables fall by 216, your sales fall by 200 and the tax you owe falls by 16. The tax treatment depends on where you are and what you sold, so check with your accountant if you are not sure, especially when a credit crosses a filing period.

Credit memo vs debit memo

These two are easily confused because each is named for the entry it creates on the books, not for how it feels to the customer.

A debit memo is the same idea in the other direction. If you billed 1,000 and should have billed 1,150, you raise a debit memo for 150, linked to the original invoice, instead of changing it.

One more source of confusion: buyers sometimes issue their own debit memo to a supplier, to say "we are reducing what we owe you". The word depends on whose books you are looking at. If a document from a customer surprises you, read what it does to the balance and not just what it is called.

Credit memo vs refund

A credit memo changes what is owed. A refund moves money back. They often go together, but they are different things.

• If the invoice is unpaid, the credit memo reduces the balance. No money moves.
• If the invoice is paid, the credit memo creates a balance in the customer's favour. You can then refund the money, or keep the credit for their next invoice.

Do not send a refund without a credit memo, or your receivables and your bank will stop agreeing with each other.

Credit memo vs discount

A discount is agreed before or at the time of invoicing, and it shows on the invoice. A credit memo is issued afterwards. If you always give the same reduction, build it into your pricing and invoices, because a stack of credit memos each month makes your sales numbers hard to read.

Common mistakes

• Forgetting the tax. Crediting the net amount alone leaves your tax account wrong.
• No link to the invoice. An unlinked credit floats on the account and can be missed on the aging report.
• Using the invoice number series. Credits need their own sequence.
• Crediting more than was billed. The credit should never exceed what is left to credit on that invoice.
• Not telling the customer. Send it, with a line saying what happens next, or they may pay the old amount.
• Applying it in the wrong period. If you close your books monthly, date it for when it was issued, not when the invoice was issued.

How this works in Pacten

In Pacten, you can raise a credit note against one invoice or on its own. When it is tied to an invoice, it is capped at what is left to credit, and it posts to the ledger automatically, so receivables update. If stock is involved, it can return the goods too. A debit note works the same way in the other direction, raising what is owed on an invoice or standing alone.

A refund in Pacten records the money going back, against a credit note or an unapplied payment. It does not send the money. You make the payment yourself, through your bank or your payment service, then record it. If an unpaid invoice is simply wrong, you can amend it under the same number, with the old terms kept, or void it as long as no payment is recorded.

The guide to creating and sending an invoice covers the rest of the process, and the ledger and the chart of accounts shows where these entries land. Tax on a credit follows the rate on the document, but Pacten does not file tax returns, so your accountant works alongside it for that.