What is the format of a UK IBAN?

A UK IBAN is 22 characters: 'GB' + 2 check digits + 4-letter bank code (e.g., NWBK for NatWest) + 6-digit sort code + 8-digit account number. Example: GB29 NWBK 6016 1331 9268 19. All sections are derived from the standard British sort code and account number.

How do I find my UK IBAN from my sort code and account number?

Combine your bank's 4-letter BIC prefix with your 6-digit sort code (no dashes) and 8-digit account number (pad with leading zeros if shorter). Prepend 'GB' and calculate the 2 check digits using MOD-97. Most UK banks display your IBAN in online banking under account details, so checking there first is the easiest approach.

Is the UK still part of SEPA after Brexit?

No. The UK left SEPA on 31 December 2020 following Brexit. UK IBANs (GB...) are no longer accepted by all European banks as SEPA transfers. Payments from EU countries to UK accounts typically go via SWIFT and may incur international transfer fees. Some payment providers have found workarounds, but SEPA membership is no longer automatic for the UK.

UK IBAN Format: How to Find Your British IBAN from Sort Code and Account Number

The UK IBAN — formally the British IBAN — is a 22-character code used to receive international payments into UK bank accounts. While the United Kingdom uses its own domestic system (sort code + account number) for transfers within the country, any international sender needs the full IBAN to route a payment correctly to a British account. This guide explains the UK IBAN format, how to construct one from a sort code and account number, and the key differences between UK and eurozone IBANs.

UK IBAN at a Glance

Country code: GB
Total length: 22 characters (always)
Format: GBkk bbbbssssss cccccccc
BBAN structure: 4-letter bank code + 6-digit sort code + 8-digit account number

UK IBAN Structure: Anatomy of GB29NWBK60161331926819

The most commonly cited UK IBAN example is GB29 NWBK 6016 1331 9268 19. Here is what each section means:

GB — Country code. ISO 3166-1 alpha-2 for the United Kingdom.
29 — Check digits. MOD-97 result for this specific BBAN.
NWBK — Bank identifier. A 4-character alphabetic code assigned to NatWest. Other banks have their own codes: BARC for Barclays, HBUK for HSBC UK, LOYD for Lloyds.
601613 — Sort code. The 6-digit branch identifier used in domestic UK transfers.
31926819 — Account number. The 8-digit customer account number.

How to Build a UK IBAN from Sort Code and Account Number

If you have a UK sort code and account number, you can derive the IBAN using this process:

Get the bank code. Find the 4-letter SWIFT bank code for your bank (NWBK, BARC, HBUK, etc.). Your bank's website lists this.
Combine the BBAN. Concatenate the 4-letter bank code + 6-digit sort code (no hyphens) + 8-digit account number. Total: 18 characters.
Calculate check digits. Append GB00 placeholder, move GB00 to the end, convert letters to numbers (A=10 ... Z=35), compute modulo 97, subtract from 98. Pad to 2 digits.
Assemble the IBAN. GB + check digits + BBAN.

In practice, you don't need to do this manually. The ibanchecker.cash validator accepts any UK IBAN and instantly confirms whether it is correctly structured and whether the check digits match.

UK IBAN Examples by Bank

NatWest

GB29 NWBK 6016 1331 9268 19

Sort code: 60-16-13 | Account: 31926819

Barclays

GB06 BARC 2032 1463 7018 56

Sort code: 20-32-14 | Account: 63701856

HSBC UK

GB60 HBUK 4009 1263 0174 72

Sort code: 40-09-12 | Account: 63017472

Does the UK Use SEPA?

The United Kingdom left the European Union in 2020. As a result, the UK is no longer a SEPA member. Transfers between UK accounts and eurozone accounts are international transfers, not SEPA Credit Transfers — even though both sides use IBANs.

In practice this means:

Sending euros from Germany to a UK account will incur international wire fees, not SEPA fees.
UK banks cannot receive SEPA Instant Credit Transfers — only standard international transfers.
Both the sender and recipient IBAN are still required, and a BIC/SWIFT code is typically needed for non-SEPA transfers.

Some fintech services (Wise, Revolut, etc.) bridge this gap by holding both UK and eurozone accounts. But a standard bank-to-bank transfer from a SEPA country to a UK account goes through SWIFT, not SEPA rails.

UK Domestic Transfers: Sort Code + Account Number

Within the United Kingdom, domestic transfers still use the traditional sort code and account number format. The IBAN is only required — or useful — when sending or receiving money internationally. If someone in the UK asks for your bank details for a domestic payment, give them your sort code and account number, not your IBAN.

Finding Your UK IBAN

Your UK IBAN is available from:

Your online or mobile banking app (look in account details or settings)
Your bank statement (usually the first page)
Contacting your bank directly

Not all UK bank apps display the IBAN prominently. If you cannot find it, most major banks provide it through their international payments section.

Common UK IBAN Mistakes

Mixing Up the Sort Code Format

UK sort codes are written with hyphens in everyday use (60-16-13) but must be entered without hyphens in the IBAN (601613). Including hyphens makes the IBAN too long and structurally invalid.

7-Digit Account Numbers

Some older UK accounts had 7-digit account numbers. These must be zero-padded on the left to 8 digits before being included in the IBAN.

Wrong Bank Code

The 4-letter bank code (NWBK, BARC, etc.) must match the actual bank holding the account. Using the wrong code produces a structurally valid IBAN that points to the wrong bank. Always take the bank code from an official source.

Validate Any UK IBAN Instantly

Before making an international payment to a UK account, always validate the IBAN. Paste it into the ibanchecker.cash validator to check the structure, verify the check digits, confirm the bank code, and get the BIC for the receiving bank — all in one step. For bulk UK IBAN verification across payroll or supplier lists, use the bulk checker.

Last updated: June 2026