SWIFT/BIC vs IBAN vs Sort Code: Differences & When to Use

Comparison Table

How They Work Together in Cross-Border Wires

When executing an international wire transfer to the UK, both a SWIFT/BIC and an IBAN are required. The sending bank uses the SWIFT code to direct the funds across the global interbank network to the target UK institution. Once the funds arrive, the receiving UK bank uses the IBAN (which embeds the UK Sort Code and account number) to identify and credit the specific customer account. This multi-stage routing prevents transaction delays and minimizes manual clearance correction steps.

When Do You Need an IBAN vs. a SWIFT Code?

You need a SWIFT/BIC code for all international wire transfers to identify the destination bank. You need an IBAN specifically when sending payments to countries that have adopted the ISO 13616 standard (which includes all European countries, the Middle East, and parts of the Caribbean). For transfers within the US, domestic routing numbers (ABA) are used instead of IBANs.

UK Domestic Clearings: BACS, CHAPS, and FPS

UK domestic payments do not route via SWIFT. Instead, they use local clearing systems such as Faster Payments Service (FPS) for instant transfers, BACS for batch payroll, and CHAPS for high-value real-time gross settlement. These local networks identify bank branches using the 6-digit Sort Code, bypassing the international correspondent banking system entirely.