Payment Infrastructure

IBAN

What Is an IBAN? Definition and How It Works

Definition

An IBAN (International Bank Account Number) is a standardised account number format identifying a specific bank account for cross-border and domestic payments. It contains a country code, check digits, and a bank-specific account identifier, enabling automated validation and accurate routing of international fund transfers with significantly reduced error rates versus legacy account formats.

How it works

An IBAN has a defined structure: a 2-letter ISO country code, 2 check digits (calculated via a modulo-97 algorithm), and the country-specific Basic Bank Account Number (BBAN) encoding the bank and account number. Total length varies by country, UK IBANs are 22 characters; German IBANs are 22 characters; French IBANs are 27 characters.

‍

Check digits enable automated validation before payment submission: systems verify the IBAN against expected country format to detect typographical errors before processing, reducing failed payments from incorrect account numbers.

‍

IBANs are mandatory for all SEPA credit transfers and direct debits. Outside Europe, US, Canada, Australia, most of Asia, IBANs are not used; international transfers to those countries require the recipient's BIC and local account number.

‍

Virtual IBANs are a payment infrastructure feature: a single master account can have thousands of virtual IBANs routed to it, each carrying a unique reference enabling automated reconciliation of incoming payments, widely used by payment platforms and marketplaces.

Why it matters

IBANs are mandatory for SEPA payment schemes, making them essential for any business receiving or sending euro payments across European borders. Incorrect IBANs cause payment failures and return fees; IBAN validation in payment flows directly reduces failed payment rates.

‍

Verification of Payee (VoP) and IBAN-name verification schemes, mandatory for euro credit transfers under the EU Instant Payments Regulation, link IBAN validation to payee name verification, reducing Authorised Push Payment fraud by warning payers when account names do not match.

‍

For businesses operating cross-border in Europe, IBAN-denominated accounts are a prerequisite for efficient payment receipt. Businesses collecting from European customers without a local IBAN face higher failure rates and correspondent banking fees on incoming payments.

With PXP

PXP supports merchants and partners across the payments value chain. To talk through European payments and settlement as part of your payment strategy, get in touch with our team.

Talk to a payments specialist

Frequently asked questions

What is a virtual IBAN?

A virtual IBAN is a unique account identifier assigned to a specific payer or transaction, routing to a single underlying master account. Platforms use virtual IBANs to automate reconciliation, each incoming payment arrives with a unique reference identifying the originating customer or invoice. Virtual IBANs do not require separate physical accounts.

Is an IBAN the same as a bank account number?

No. An IBAN is a standardised international format encoding country, bank, and account number into a single string with check digits. A bank account number is the domestic identifier used within a country's own banking system. Most IBAN-using countries derive their IBAN from the domestic account number, but the formats are different and not interchangeable.

Why don't the US and Canada use IBANs?

The US and Canada developed their own payment infrastructure before the IBAN standard was established and have not adopted it. US domestic payments use ABA routing numbers and account numbers. International transfers to US and Canadian accounts use the recipient's BIC and local account number.