IBAN is an international 20-digit number used for both domestic and international transactions, it simplifies and standardizes your interaction with banks and financial institutions across not only the EEA but almost all over the world. Yes, earlier it was a special BBAN number for domestic payments, but since 2014, domestic and international transactions have been set to IBAN in Estonia. An IBAN number actually made international business life much easier and safer because of the standardization of the payment process and the deliverance of possible mistakes with operations between different countries.