What is a credit memo?
Quick answer
A credit memo, also called a credit note, is a document a seller issues to reduce the amount a buyer owes. It is used when goods are returned, a shipment arrives short, a price was billed wrong or a service fell short. It references the original invoice and states the amount being credited.
Last updated
Updated · By Robert Breen
Why it matters for a small business
Mistakes happen in billing, and the clean way to fix one is a credit memo, not a quiet edit to an invoice that was already sent. The original stays on record, the credit sits next to it, and anyone reviewing the account later can see what happened and why. That record matters at month end and in any audit.
For a buyer, a credit memo changes what to pay. If you pay the original invoice in full and forget the credit, you overpay. If you take a deduction without one, the vendor's records won't match yours and the account looks short. Recording the credit in accounts payable and mentioning it in your remittance advice keeps both sides aligned.
In a real lesson: Build an AI Vendor Follow-Up Agent in n8n
The AI Vendor Follow-Up Agent lesson includes the most common reason for a credit memo. Ridgeline Supply Co., a made-up warehouse and distribution business, receives PO 4492 from Northwind Wrap 12 rolls short of what it ordered.
The agent's draft says the order "arrived today, but we received 12 fewer rolls of stretch wrap than ordered," and asks, "Can you ship the missing 12 rolls or issue a credit?" with a reply-by date of Sep 29. The row saved to the Vendor Follow-Ups sheet records the issue as "Shipped 12 rolls short."
If the vendor chooses the credit, it would issue a credit memo against its invoice for that order, and Ridgeline would pay the invoice minus the credit. The lesson stops at the follow-up message. It doesn't cover the memo itself or the payment, and the system message keeps escalation human: "Do not threaten to cancel orders or invent penalties."
Try this lesson free or read the step-by-step guide.
Common confusions
Credit memo vs refund
A credit memo lowers a balance. A refund sends money back. A credit can later turn into a refund if there is nothing left to apply it to, but the two are recorded differently.
Credit memo vs debit memo
A seller issues a credit memo to reduce what a buyer owes. A debit memo, often sent by a buyer, records a charge back or asks for a reduction. Names vary by company, so read the document, not just its title.
Tips
- Always reference the original invoice number and the reason on the memo.
- Apply credits to a specific open invoice instead of leaving them floating on the account.
- When AI drafts a credit memo explanation email, check the amount and invoice number against your system.
Related terms
More Business terms
Where you use it: free lessons
- Build an AI Vendor Follow-Up Agent in n8n (n8n, 12 min)
- AI Receipt Extractor: Receipts to Google Sheets with n8n (n8n, 12 min)
Prompt templates that use it
Frequently asked questions
- Does a credit memo expire?
- That depends on the vendor's policy and your agreement. Ask the vendor how and when the credit can be used, and get the answer in writing.
- Who issues a credit memo, buyer or seller?
- The seller, because it is the seller's invoice being reduced. The buyer requests it and records it when it arrives.