What is Nationwide Building Society's BIC/SWIFT code?

Nationwide Building Society's BIC/SWIFT code is NAIAGB21 (full: NAIAGB21XXX). This is an ISO 9362 standard identifier used for international wire transfers.

How long is a Nationwide Building Society IBAN?

Nationwide Building Society IBANs follow the United Kingdom format: 22 characters starting with GB.

Is Nationwide Building Society a SEPA member?

Yes, Nationwide Building Society is a SEPA member, so you can send and receive SEPA credit transfers and direct debits.

What country is Nationwide Building Society in?

Nationwide Building Society is based in United Kingdom, headquartered in Swindon. The IBAN country code for United Kingdom is GB.

🇬🇧 United Kingdom

✓ SEPA MemberPrivate Bank

Nationwide Building Society IBAN Format & BIC Code

Find the official BIC/SWIFT code for Nationwide Building Society, understand the United Kingdom IBAN format used for all Nationwide Building Society accounts, and validate any IBAN instantly.

Bank Details

Full nameNationwide Building Society

BIC / SWIFT codeNAIAGB21

Full BIC (with branch)NAIAGB21XXX

Country🇬🇧 United Kingdom

CitySwindon

Institution typePrivate Bank

Official websitenationwide.co.uk ↗

SEPA memberYes

Transfer networkSEPA + SWIFT

IBAN Format at Nationwide Building Society

IBANs at Nationwide Building Society follow the United Kingdom standard: 22 characters starting with GB.

Illustrative Nationwide Building Society IBAN (sample account, not a real one):

G

B

1

8

W

E

S

T

Country

Check Digits

Bank Code

Sort Code

Account No.

Grouped example:

GB18 WEST 6016 1331 9268 19

IBAN Field Breakdown

Country Code

2 charsISO 3166-1 alpha-2 country code (GB)

Check Digits

2 charsMOD-97-10 check digits per ISO 13616

Bank Code

4 letters4-letter bank identifier (SWIFT prefix)

Sort Code

6 digits6-digit branch sort code

Account No.

8 digits8-digit account number

How to Find Your Nationwide Building Society IBAN

Mobile or online banking

Log in to your Nationwide Building Society account and navigate to account details. Your IBAN is usually shown on the main account overview page.

Bank statement

Your full IBAN appears on any official account statement — typically at the top alongside the account name.

Debit card / welcome letter

Nationwide Building Society may include your IBAN in your account welcome pack or on any correspondence.

Call or visit the bank

Contact Nationwide Building Society customer service or visit a branch with valid photo ID to obtain your IBAN.

Validate a Nationwide Building Society IBAN

Enter any GB IBAN — MOD-97 check digit verification + bank lookup.

Other United Kingdom Banks

United Kingdom IBAN format →

London

London

London

London

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