Sort codes are the domestic bank codes used to route money transfers between financial institutions in the United Kingdom, and in the Republic of Ireland. They are six-digit hierarchical numerical addresses that specify clearing banks, clearing systems, regions, large financial institutions, groups of financial institutions and ultimately resolve to individual branches. In the UK they continue to be used to route transactions domestically within clearance organizations and to identify accounts, while in the Republic of Ireland (a founder member of the Euro) they have been deprecated and replaced by the SEPA systems and infrastructure.
Sort codes for Northern Ireland branches of banks (codes beginning with a '9') were registered with the Irish Payment Services Organization (IPSO) for both Northern Ireland and the Republic. These codes are used in the British clearing system and historically in the Irish system.
The sort code is usually formatted as three pairs of numbers, for example 12-34-56. It identifies both the bank (in the first digit or the first two digits) and the branch where the account is held. Sort codes are encoded into IBANs but are not encoded into BICs.
History
Codes began to be used in the early 20th century to facilitate the manual processing of cheques. Known as a 'national code', these had between three and five digits.
The eleven London clearing banks were each allocated a main number, with the "big five" (and the Bank of England) allocated single-digit numbers alphabetically. Lloyds Bank, for example, was allocated 3 and National Provincial was allocated 5. The remaining single digit codes were used to indicate that a cheque was from outside the London clearing system. The smaller clearing banks were allocated two-digit numbers, for example Martins was allocated 11.
The bank branches were allocated further digits by their bank to make up the entire number; some banks represented these on cheques in smaller type. Main clearing branches (usually major London branches) would have only one digit after the main number, e.g. 111. Metropolitan branches (which covered Greater London) had two digits after the main number, e.g. 1124. Country branches made up the rest of the country, and used three or more digits after the main number, e.g. 11056. They were displayed on cheques in this fashion, with the bank identifier taking precedence.
Six-digit "sorting codes" were introduced in a staggered process from 1957 as the banking industry moved towards automation. The national codes were retained but where a single digit was used to identify the bank a two-digit range was introduced. So, for example, Barclays codes went from starting with a 2 to 20, Midland from 4 to 40, etc.
List of sort codes of the United Kingdom
In the United Kingdom the initial digits of bank sort codes were originally allocated to settlement members of the Cheque and Credit Clearing Company and the Belfast Bankers' Clearing Company. Today, sort codes are issued to any organisation that will be a direct member of a UK electronic payment network (in addition to the cheque clearing systems, this includes BACS, Faster Payments and CHAPS). Non-standard sort codes are issued to payment service providers who need an IBAN, for example for SEPA, as the sort code forms part of this.
The allocation of sort codes is managed by BACS. These numbers are six digits long, formatted into three pairs which are separated by hyphens.
Cheque clearing
The cheque clearing system in the United Kingdom is managed by Pay.UK, following the merger of the Cheque and Credit Clearing Company, BACS and Faster Payments Ltd in 2018. Since August 2019, sterling cheque clearing has been through the Image Clearing System.
England and Wales
In the following list the dates in parentheses give the year of merger with the present-day sort code holder, or its subsidiary.
Scotland
Separately operated by the Committee of Scottish Clearing Bankers until 1985.
Northern Ireland
The clearing system in Northern Ireland was operated under the Belfast Clearing Rules which were agreed by the Belfast Bankers' Clearing Company (formerly the Belfast Bankers' Clearing Committee), until the introduction of the Image Clearing System managed by Pay.UK which was completed in August 2019. Sort codes in the 90 range are managed by the Irish Payment Services Organisation (IPSO).