What is a credit note?
A credit note (also called a credit memo) is a document issued by a seller to a buyer that reduces the amount owed on a previous invoice. Think of it as a "negative invoice" — instead of requesting payment, it reduces or cancels a charge that was previously billed.
Credit notes are a standard part of business accounting. They create a proper paper trail when an invoice needs to be adjusted, rather than simply deleting or modifying the original invoice (which would create accounting and tax compliance issues).
When to issue a credit note
You should issue a credit note when:
- Goods are returned — the buyer returns products and needs the charge removed or reduced
- Invoice error — the original invoice overcharged the customer (wrong price, wrong quantity, duplicate billing)
- Post-sale discount — you agree to a discount after the invoice was already sent (volume discount, loyalty adjustment, or negotiated reduction)
- Services not delivered — you billed for services that were partially or fully not provided
- Damaged goods — products arrived damaged and the buyer is entitled to a credit
- Contract cancellation — a service contract is cancelled and prepaid amounts need to be credited
Never simply delete an invoice and create a new one — this breaks your invoice numbering sequence and creates accounting problems. Issue a credit note against the original invoice, then issue a corrected invoice if needed.
Credit note vs. refund
A credit note and a refund are related but different:
- Credit note — an accounting document that reduces the buyer's balance. The credit can be applied to future invoices, used on future purchases, or serve as the basis for a cash refund. It's a bookkeeping adjustment.
- Refund — the actual return of money to the buyer, whether by check, bank transfer, or credit card reversal. It's a cash transaction.
In practice, many businesses issue a credit note first, then process a refund based on that credit note. This keeps the accounting clean — the credit note adjusts the books, and the refund moves the money.
What to include in a credit note
A proper credit note should contain:
- Credit note number — a unique sequential number (e.g., CN-001, CN-002) from a separate numbering system than your invoices
- Date of issue — when the credit note is created
- Original invoice reference — the invoice number the credit note relates to
- Seller's details — business name, address, and tax ID
- Buyer's details — business name and address
- Reason for the credit — a clear explanation of why the credit is being issued
- Line items — the specific products or services being credited, with quantities and prices
- Credit amount — the total amount being credited (shown as a negative or clearly marked as a credit)
- Tax adjustment — if the original invoice included sales tax, the credit note should include the corresponding tax reduction
Credit note numbering
Credit notes should have their own numbering sequence, separate from invoices. Common formats include:
- CN-001, CN-002, CN-003 — simple sequential numbering
- CN-2026-001 — includes the year for easier filing
- CN-INV-1234 — references the original invoice number directly
Whatever format you choose, keep it consistent and sequential. Gaps in credit note numbering can raise questions during an audit, just as gaps in invoice numbering would.
Accounting treatment
Credit notes affect your books in the opposite way an invoice does:
- Revenue reduction — the credit note reduces your total revenue for the period
- Accounts receivable — if the original invoice hasn't been paid, the credit note reduces the amount the customer owes
- Accounts payable — if the original invoice was already paid, the credit note creates a liability (you owe the customer money or a future credit)
- Tax adjustment — if you collected sales tax on the original invoice, the credit note reduces your sales tax liability
Most accounting software handles credit notes automatically — you issue the credit note, and the software adjusts revenue, receivables, and tax calculations accordingly.
Best practices for credit notes
- Issue promptly — don't delay credit notes; issue them as soon as the reason arises (return processed, error discovered)
- Always reference the original invoice — this creates a clear audit trail and makes reconciliation easier
- Include the reason — "goods returned" or "pricing error on line 3" helps with future reference and dispute resolution
- Send to the customer — even if the credit note adjusts your books automatically, send a copy to the customer so they know their balance has been updated
- Keep records — store credit notes alongside the original invoices for at least 7 years (or as required by your jurisdiction's tax laws)