SWIFT, BIC and IBAN for business payments: what each identifier actually does

International bank transfers often ask for an IBAN, a BIC or SWIFT code, beneficiary name and sometimes additional bank information. These fields do different jobs. The safest payment process understands which identifier locates the account, which identifies the bank, and when the payment system can derive one from the other.

IBAN identifies the beneficiary account in a standard international format

An International Bank Account Number is a structured account identifier used for cross-border and certain domestic payment schemes. UK government payment pages commonly publish an IBAN when money is being sent from an overseas account. A UK IBAN begins with the country code GB and incorporates information that allows the payment service provider to identify the relevant banking route and account.

Do not treat the IBAN as a cosmetic version of the domestic account number. Enter it exactly as provided, checking country code, length and characters. One incorrect digit can cause a payment to fail validation, reach the wrong routing path or require manual repair. For high-value supplier payments, store the approved IBAN in the supplier master rather than retyping it from an invoice every month.

BIC and SWIFT code are commonly used as names for the bank identifier

GOV.UK payment instructions describe the BIC as the SWIFT Bank Identifier Code. It identifies the financial institution involved in routing the payment. A BIC normally contains an institution code, country code, location code and sometimes a branch code.

The account and bank identifiers work together. An IBAN points to the beneficiary account structure, while the BIC identifies the institution. For some payment schemes the bank can derive routing information from the IBAN, while for other international payments the sending bank can still ask for both IBAN and BIC or additional intermediary-bank information.

For SEPA euro transfers, firms should not make BIC a mandatory customer-supplied field

The FCA's SEPA guidance says UK-based payment firms carrying out euro credit transfers or direct debits to SEPA countries must not make it mandatory for the payer or payee to provide the BIC to initiate the transaction. They should use the IBAN instead. UK Finance and SWIFT developed an IBAN-only directory so the relevant BIC can be derived where required.

This does not mean BIC has disappeared from international banking. It means that in the SEPA context the customer should not have to supply it as a mandatory identifier. A non-SEPA wire, a bank's internal form or a correspondent-banking chain can still require BIC/SWIFT information. Follow the route being used rather than one universal form template.

Build the complete beneficiary instruction before the payment deadline

International payments can require beneficiary legal name, beneficiary address, IBAN or local account number, BIC/SWIFT code, bank name, payment currency, payment purpose and sometimes an intermediary bank. Collect those fields as part of supplier onboarding instead of waiting until an invoice becomes due.

For example, a supplier may invoice £250,000 equivalent in US dollars and request settlement to a US account using a local routing number plus SWIFT code rather than an IBAN. A European supplier can instead provide an IBAN for a euro transfer. The finance team should capture the route appropriate to the destination country and currency rather than force every supplier into one data format.

Verify new or changed international bank details outside the payment request

International bank-detail fraud works the same way as domestic supplier fraud: an attacker substitutes new beneficiary details and relies on urgency. Confirm changed IBAN or SWIFT details through a known telephone number, secure supplier portal or another trusted channel. Do not verify the change by replying to the same unexpected email that supplied it.

Check whether the beneficiary name and country match the commercial relationship. If a UK company that has always paid a German supplier suddenly receives instructions for an unrelated bank in another country, escalate before payment. The identifiers can be technically valid while the underlying instruction is fraudulent.

Keep routing information with the payment evidence and supplier master

Save the approved IBAN, BIC, bank name, currency and verification date in the supplier record. For material transfers, keep the payment confirmation and any SWIFT or bank reference supplied by the provider. These references can be important if the transfer is delayed, returned or disputed.

Review the record whenever the supplier changes banks or legal entity. Do not overwrite old details without preserving the effective date, because finance may later need to explain which account was valid for a historic payment. Good routing data reduces both payment failure and fraud risk.