How IBAN Replaced Domestic Account Numbers in Europe
Before IBAN, every European country had its own incompatible account number system. The transition to IBAN standardised cross-border banking across an entire continent.
The Pre-IBAN World
Before the IBAN system, sending money across borders in Europe required knowing the recipient's domestic account format — which varied dramatically. Germany used 8-digit Bankleitzahlen and 10-digit account numbers. France used 5+5+11+2 character structures. The UK used sort codes and account numbers. These incompatible systems caused frequent errors and delays.
The Development of IBAN
The IBAN standard was developed in the 1990s by ISO and ECBS. The first version (ISO 13616:1997) was adopted by European banks starting in the late 1990s. The EU mandated IBAN usage for SEPA transfers, which became effective in 2014 — at which point domestic-format transfers within the eurozone were phased out.
What Countries Still Don't Use IBAN?
Notably, the United States, Canada, Australia, China, Japan, and most of Latin America do not use IBAN. These countries use SWIFT/BIC codes combined with domestic routing numbers and account numbers. If you are sending money to any of these countries, you will not use an IBAN — see our country list to check.
The Result
Today, 77 countries covering most of Europe, the Middle East, and parts of the Caribbean and Central Asia use IBAN. The standard reduced payment errors across borders by an estimated 30–40% according to banking industry studies.