What an IBAN tells your counterparties — and why the country code matters
Structure of an IBAN, what the country prefix signals to a partner's bank, and the practical difference between a UK and an EU account.
An IBAN is a standardised account identifier: a two-letter country code, two check digits and a national account number. The country code is the part people react to.
Domestic vs cross-border
For a German supplier, an IBAN starting with DE, MT or LV is simply a SEPA account — same cost, same speed. A GB account is domestic for UK counterparties and uses Faster Payments; for euro flows it is treated as a cross-border payment.
IBAN discrimination
Refusing a valid SEPA IBAN because of its country code is prohibited under the SEPA Regulation. If a counterparty's system rejects an MT or LV IBAN for a euro payment, that is a compliance issue on their side, and most regulators publish a complaint route.
Which to put on your invoices
Match the rail to the payer: GBP invoices to UK clients carry UK sort code details; EUR invoices to EU clients carry the SEPA IBAN. Many businesses simply show both.
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