AC01 - Incorrect account number

What this code means

AC01 means the creditor account number (IBAN) in your payment is not a valid account number. The bank could not route the payment because the IBAN itself is malformed or does not exist.

Typical causes

• A typo in the IBAN — a transposed or missing character.
• The IBAN was copied from an invoice or e-mail with a broken line or a stray space.
• The beneficiary supplied an account number in a national format instead of an IBAN.

What to do

Check the IBAN character by character with the beneficiary, validate its check digits, correct it and resubmit the payment. This rejection is recoverable — once the IBAN is right, the same payment can be sent again.

What it looks like in a pain.002

The reason code is carried in the StsRsnInf/Rsn/Cd element of the status report.

<?xml version="1.0" encoding="UTF-8"?>
<Document xmlns="urn:iso:std:iso:20022:tech:xsd:pain.002.001.03">
  <CstmrPmtStsRpt>
    <GrpHdr>
      <MsgId>STATUS-2026-000123</MsgId>
      <CreDtTm>2026-01-15T09:30:00</CreDtTm>
    </GrpHdr>
    <OrgnlGrpInfAndSts>
      <OrgnlMsgId>MSG-2026-000045</OrgnlMsgId>
      <OrgnlMsgNmId>pain.001.001.09</OrgnlMsgNmId>
    </OrgnlGrpInfAndSts>
    <OrgnlPmtInfAndSts>
      <OrgnlPmtInfId>PMTINF-2026-01</OrgnlPmtInfId>
      <TxInfAndSts>
        <OrgnlEndToEndId>E2E-REF-0001</OrgnlEndToEndId>
        <TxSts>RJCT</TxSts>
        <StsRsnInf>
          <Rsn>
            <Cd>AC01</Cd>
          </Rsn>
        </StsRsnInf>
      </TxInfAndSts>
    </OrgnlPmtInfAndSts>
  </CstmrPmtStsRpt>
</Document>

Tools for this code

Decode a real status report, or check a payment file before you send it — all in your browser, nothing uploaded.

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