What is a Credit Note?

A credit note is a document issued by a seller to a buyer that reduces or cancels the amount owed on a previously issued invoice . It functions as a negative invoice and is a standard part of UK commercial practice for correcting billing errors, processing returns and recording price adjustments.

When to issue a credit note

Credit notes are issued in a range of situations where the original invoice amount needs to be reduced or reversed entirely:

• Goods returned by the customer due to defects, incorrect delivery or change of mind (where terms allow)
• Pricing errors on the original invoice
• Overcharging due to quantity discrepancies
• Agreed discounts or rebates applied retrospectively
• Cancelled orders where an invoice was already raised
• Duplicate invoices issued in error

In every case, the credit note must clearly reference the original invoice number it relates to, so both parties can reconcile their records accurately.

Legal requirements for UK credit notes

Under HMRC rules and the VAT Act 1994, a valid credit note must contain:

The credit note does not need to follow the exact same template as the invoice, but it must contain enough information for both parties to update their accounting records and VAT returns correctly.

VAT treatment of credit notes

Credit notes have direct VAT implications for both the issuer and the recipient:

For the seller (issuer)

• Reduce output VAT in the VAT return period when the credit note is issued
• Adjust the net sales figure downward
• Record the credit note in the sales ledger

For the buyer (recipient)

• Reduce input VAT claimed in the relevant VAT return period
• Adjust the purchase cost in the accounts
• Record the credit note against the original invoice in the purchase ledger

HMRC expects that VAT adjustments from credit notes are reflected in the VAT return for the period in which the credit note is issued, not backdated to the original invoice period.

When a credit note is not required for VAT

If the adjustment is less than £50 (including VAT) and the supplier keeps adequate records, HMRC may accept a simpler adjustment process without a formal credit note. However, issuing a credit note is still best practice for audit trail purposes.

Accounting entries for credit notes

Seller’s books

When a credit note is issued:

Debit:  Sales returns / Revenue
Debit:  Output VAT
Credit: Trade receivables (customer account)

This reduces both revenue and the amount owed by the customer.

Buyer’s books

When a credit note is received:

Debit:  Trade payables (supplier account)
Credit: Purchase returns / Cost of goods
Credit: Input VAT

This reduces both the cost recorded and the amount owed to the supplier.

For a broader overview of how these entries fit into the accounting framework, see what accounting is and its principles.

Credit note vs refund

A credit note and a refund are related but distinct:

In practice, a credit note may be followed by a refund payment, or it may simply reduce the customer’s outstanding balance for future invoices. The approach depends on the trading relationship and outstanding balances.

Credit notes and payment terms

When a credit note is applied against an outstanding invoice, it can affect payment terms in the following ways:

• The net amount payable changes, which may alter the payment due
• If the credit note exceeds the invoice, the supplier may owe the customer a refund or carry a credit balance forward
• Early payment discounts should be recalculated based on the adjusted net amount
• Any late payment penalties should be applied to the adjusted amount, not the original

Processing credit notes efficiently

Matching and reconciliation

Credit notes should be matched against the original invoice in the accounting system. Most modern accounting software handles this through:

• Invoice-to-credit-note linking using the original reference number
• Automatic balance adjustment on the customer or supplier account
• VAT return integration to reflect the adjustment in the correct period

Approval workflows

Just like invoices, credit notes should go through an approval process before being issued:

• Verification that the reason for the credit is valid
• Authorisation by someone with appropriate authority, not the person who raised the original invoice
• Documentation of supporting evidence such as return notes, complaint records or pricing agreements

This prevents fraudulent or incorrect credit notes, which can be a significant internal control risk.

Common mistakes with credit notes

• Not issuing a credit note when one is required, leading to overstated revenue and incorrect VAT returns
• Issuing a credit note without referencing the original invoice, making reconciliation difficult
• Backdating the VAT adjustment to the original invoice period instead of the credit note issue period
• Using credit notes to mask revenue manipulation, which is a red flag for auditors and HMRC
• Not communicating the credit note to the customer, leaving their records out of sync

Credit notes in a purchase order workflow

When a business uses purchase orders , credit notes fit into the broader procurement cycle:

1. Purchase order raised and approved
2. Goods or services delivered
3. Invoice received and matched to the purchase order
4. Issue identified (wrong quantity, defective goods, pricing error)
5. Credit note requested and received
6. Credit note matched against original invoice and purchase order
7. Adjusted amount paid via BACS or another payment method

This three-way matching process (purchase order, invoice, credit note) strengthens internal controls and reduces payment errors.

Retention and record-keeping

HMRC requires businesses to keep credit notes for a minimum of six years as part of their accounting records. Credit notes should be stored alongside the related invoices for easy retrieval during audits or VAT inspections.

Digital storage is acceptable provided the records are complete, accurate and accessible throughout the retention period.