What is Credit Note?

A credit note (also called a credit memo) is issued when you need to reduce the amount a client owes after an invoice has already been sent. Common reasons for issuing a credit note include:

• An error on the original invoice (wrong amount, duplicate charge)
• Goods returned by the buyer
• A negotiated discount or price adjustment after invoicing
• Cancellation of part of a project or service

In the UK, credit notes are particularly important for VAT-registered businesses. When you issue a credit note, you must adjust your VAT records accordingly. HMRC requires that credit notes reference the original invoice number, state the reason for the credit, and show the VAT adjustment if applicable.

A credit note should include:

• The words "Credit Note" clearly displayed
• A unique credit note number
• The original invoice number being credited
• The date of issue
• The amount being credited (with VAT breakdown if registered)
• The reason for the credit

Rather than deleting or altering an invoice (which creates compliance issues), always issue a credit note and then a new corrected invoice if needed. This maintains a clear audit trail that satisfies both HMRC and good accounting practice.