Comparison

SWIFT code vs routing number: what's the difference?

Updated August 2026. Evergreen page — refreshed in place as facts change.

What is a routing number?

An ABA routing number is a nine-digit identifier assigned to US banks and credit unions for domestic payment routing — ACH transfers, direct deposit, checks, and domestic wires. It is a US-only system, and the digits are structured: the leading digits reflect the institution's Federal Reserve routing region, and the ninth is a check digit that validates the number mathematically.

Two practical wrinkles: large banks often use different routing numbers by state, and many banks use one routing number for ACH and a different one for incoming wires. When a form asks for 'the' routing number, match it to the payment type.

What is a SWIFT/BIC code?

A SWIFT code — formally a BIC, Business Identifier Code — identifies a bank on the international SWIFT messaging network. It is 8 or 11 characters with a fixed anatomy: four letters for the bank, two for the country, two for the location, and an optional three for a specific branch. CHASUS33, for example, reads as Chase (CHAS), United States (US), New York (33).

Where a routing number tells US payment systems which bank to hit domestically, the SWIFT code answers the same question for the whole world — it is how a bank in Singapore addresses a payment message to a bank in Ohio.

When do you use each one?

Match the identifier to the job:

Do you ever need both codes?

Regularly. To receive an international wire into a US account you hand the sender your bank's SWIFT code and your account number — and some banks' incoming-international instructions add a routing number for the final domestic leg. Fintech accounts often receive international payments through a partner bank's SWIFT code with special instructions, so check your provider's published receiving details rather than guessing.

Our routing numbers directory lists the ABA routing numbers, wire routing numbers, and SWIFT codes major US banks publish, in one place per bank.

Where does an IBAN fit in?

An IBAN identifies a specific account — up to 34 characters including a country code and check digits — used across Europe and much of the world. The clean mental model: SWIFT/BIC identifies the bank, IBAN identifies the account at that bank. The US does not issue IBANs; a US account is identified by routing number plus account number domestically, and by SWIFT code plus account number from abroad.

So when an overseas form insists on an IBAN for your US account, it does not exist — the sender's bank will have a US-payment path that takes SWIFT plus account number instead.

Where do you find each code?

Your routing number: the account-details screen of your banking app, the bottom-left of your checks (the ACH one), or your bank's published wire instructions (the wire one). Your bank's SWIFT code: its international transfer page or a support chat — and for major US institutions, our routing numbers directory lists routing numbers and SWIFT codes side by side. Always confirm codes against your bank's own published details before money moves; a transposed digit is the classic cause of a stalled transfer.

The failure modes differ, which is worth knowing: a wrong SWIFT code usually bounces the payment outright, while wrong account details can misdirect it — a much worse outcome. Verify each independently, from the bank's own pages or the recipient's confirmed details, never from a forwarded email.