Credit Notes in AP

A credit note (also called a credit memo) is a document issued by a supplier to reduce the amount owed by the purchaser. Credit notes are issued in situations including: the original invoice was overcharged, goods were returned, a discount was agreed after the original invoice was issued, a service was not completed as specified, or a previous duplicate payment is being offset. A credit note reduces the outstanding AP balance with that supplier and is applied against future invoices from the same supplier, or results in a cash refund if no future invoices are expected.

Credit notes are a normal part of the supplier billing cycle but create processing complexity in AP because they are negative amounts that must be correctly matched to the original invoice and supplier record. An unprocessed credit note from a supplier inflates the AP balance -- the business shows it owes more than it actually does -- and can result in overpayment if the credit is not applied before the next payment run.

Processing credit notes correctly

A supplier credit note should be entered into the AP system as soon as it is received, just as a regular invoice is processed. The credit note amount should be matched to the original invoice it relates to (where identifiable) so that the liability reduction is correctly attributed. In Xero and MYOB, credit notes are typically entered as a negative bill or credit note transaction linked to the supplier record, and are then applied to an existing open invoice balance or held as an unapplied credit against the supplier account.

The GST treatment of credit notes must match the original invoice. If the original invoice included GST, the credit note reduces both the expense amount and the GST component. The reduction in the GST component adjusts the business's ITC position -- in the BAS period the credit note is applied, the ITC claimed is reduced by the GST on the credit note. Failing to record the GST component of credit notes correctly produces BAS errors in the opposite direction to the original invoice.

Disputes and credit notes

Credit notes are sometimes the outcome of an invoice dispute resolution: the business disputes an amount, the supplier agrees, and issues a credit note for the disputed portion. In these cases, the original invoice should be recorded in full and the credit note applied separately -- not simply reduced to the net payable amount by hand. Recording invoices and credit notes separately preserves the audit trail showing why the net amount paid differs from the face value of the invoice, which is important for both internal controls and external audit.

Unresolved credit situations -- where the business believes a credit is owed but the supplier has not issued a formal credit note -- should be tracked in the AP system as a disputed balance rather than being informally deducted from the next payment. Informal deductions create confusion for both AP and the supplier's accounts receivable team, and can result in disputed payment allegations or relationship friction. The cleaner approach is to request a formal credit note and record it when received.