SWIFT / BIC vs. IBAN — What They Are and When You Need Each

An IBAN — International Bank Account Number — is a standardised way to write a bank account number so that any bank in any country can parse it. It always starts with a two-letter country code (DE, FR, ES…), then a two-digit checksum, then a country-specific block that contains the domestic bank code, branch code and account number. The maximum length is 34 characters; German IBANs are 22 characters, French 27, UK 22, Maltese 31.

A SWIFT code — also called a BIC (Business Identifier Code) — is an 8 or 11 character code that identifies a bank, not an account. It is administered by SWIFT (the Society for Worldwide Interbank Financial Telecommunication) in Belgium. The first four letters identify the institution, the next two the country, the next two the location, and the optional final three the branch. DEUTDEFF is Deutsche Bank Frankfurt; BNPAFRPP is BNP Paribas Paris.

The two codes are complementary, not alternatives. The IBAN tells a payment network which account to credit; the BIC tells it which bank operates that account and which network to route the message through.

Within the SEPA zone — the 36 countries covered by the Single Euro Payments Area — an IBAN alone is legally sufficient since the SEPA End Date Regulation of February 2016. Sending a SEPA credit transfer from Spain to Germany requires the beneficiary IBAN and name. The BIC is derived automatically from the IBAN by the sending bank. Some legacy interfaces still ask for the BIC, but it is not required.

Outside the SEPA zone, or for non-EUR currencies, the BIC becomes mandatory. A USD wire from a US bank to a French account needs the French IBAN, the beneficiary bank's BIC, and often a correspondent bank routing chain. A GBP payment from the UK to an EU bank uses the same combination. Cross-border corporate payments and card-issuer settlements routinely require both fields plus intermediary bank details.

You can look up any bank's SWIFT/BIC code in our directory at /swift-bic — searchable by bank name, country or code.

The most frequent error is entering the SWIFT/BIC of a different branch of the correct bank. Most large banks have a single central BIC (ending in XXX or with the location code only); using a specific branch BIC that no longer exists is a common cause of rejected wires. When in doubt, use the head-office BIC.

The second most common error is a mistyped IBAN. The 2-digit checksum catches most single-character typos, but a swap of two adjacent digits inside the account-number block sometimes passes the checksum and lands the money in a stranger's account. Always copy IBANs from the payee's own document, never retype from memory.

The third — and the one that costs the most — is confusing SEPA with SWIFT for EUR payments inside the EU. Sending a EUR payment via a SWIFT MT103 message when a SEPA credit transfer would work adds €15–€50 in correspondent fees for no operational benefit.