Credit notes

A credit note (often called a credit memo in some regions) is a document that reduces what a customer owes you, or creates credit on their account, after an invoice has already been issued.

It preserves history: instead of pretending the original invoice never happened, you keep the invoice and record the correction separately. That trail helps accounting and audits.

Credit notes are common when you overbilled, agreed a goodwill reduction, or need to reverse part of a sale without rewriting the past.

Use a credit note when you billed too much, a client returned goods, a service level credit applies, or you cancel part of an invoiced amount after the invoice was sent.

Example: You invoiced $2,000 for 20 hours but the approved total was 18 hours at the same rate. Issue a credit note for $200 referencing INV-3001 rather than quietly asking them to “just pay $1,800” with no paperwork.

If the invoice was never sent or was a pure draft error, you may void and reissue instead. Once the client’s AP system has the original, a credit note is usually cleaner.

A credit note adjusts the balance. A refund returns money already paid. A receipt proves a payment occurred. They often work together but are not identical.

If the client has not paid yet, a credit note may simply reduce the amount still due. If they already paid in full, you may apply credit to future invoices or issue a refund.

Always reference the original invoice number, state the reason, and show tax treatment clearly when taxes apply.

Credit note number, date, client details, original invoice reference, line-item explanation, amounts, taxes, and the resulting credit total.

Sample reason line: “Credit for unused onboarding hours on INV-3001 — client paused project 12 May.” Clarity prevents AP from rejecting the document.

Send it with a short email: what changed, what they should pay now (if anything), and whether a refund is coming.

Apply the credit in your records the same day you issue the note. Unapplied credits create the same chaos as unapplied cash.

Do not use credit notes to hide bad bookkeeping. If your scoping process creates constant credits, fix the quote workflow.

What to do next: create a simple credit-note checklist (reason, original invoice, amount, tax, client email) and use it the next time a correction is needed.