Structure of the UK IBAN

The International Bank Account Number (IBAN) is an internationally agreed means of identifying bank accounts across national borders with a reduced risk of transcription errors. It was originally adopted by the European Committee for Banking Standards (ECBS), and later as an international standard under ISO 13616:1997. The current standard is ISO 13616:2007, which indicates SWIFT as the formal registrar initially developed to facilitate payments within the European Union; it has been implemented by most European countries and many countries in the developing world, especially in the Middle East and in the Caribbean.


National bank code
ISO 3166
Iban checksum BBAN (Basic Bank Account Number)
Bank code Branch Sort code Account number
GB 26 MIDL 400515 12345674

United Kingdom (UK) Bank Account Number
Data element Example
Name of country United Kingdom
Country code as defined in ISO 3166 GB identifies the country of issue of the IBAN as the United Kingdom of Great Britain and Northern Ireland. This explicitly includes the Channel Islands and Isle of Man within the country code GB
Domestic bank account number example
40-05-15 12345674
BBAN structure 4!a6!n8!n
BBAN length 18!c
Bank identifier position within the BBAN Positions 1-4, Branch identifier positions: 5-10
Bank identifier length 4!a, Branch identifier length: 6!n
Bank identifier example MIDL, Branch identifier example: 400515
BBAN example MIDL40051512345674
IBAN structure GB2!n4!a6!n8!n
IBAN length 22!c
IBAN electronic format example GB26MIDL40051512345674
IBAN print format example GB26 MIDL 4005 1512 3456 74
Contact details Mr James WHITTLE
Head of Standards
Mercury House,Triton Court
14 Finsbury Square
Tel: +44 207 711 6209
Fax: +44 207 711 6299