Comparison

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

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

Routing number

9 digits

US only; also called an ABA number

SWIFT/BIC

8 or 11

Characters; identifies a bank worldwide

IBAN

Up to 34

Characters; identifies one account

IBAN countries

89

Using IBANs, as of late 2024

Swift network

11,500+

Member institutions worldwide

US IBANs

None

Use SWIFT code plus account number

Check digit

9th digit

Validates the routing number

Mexico's CLABE

18 digits

Bank, city, account and check digit

SWIFT code vs routing number is a question of scope. A routing number finds a bank inside the United States; a SWIFT/BIC code finds a bank anywhere on the Swift network; and neither one identifies your account — that is the account number's job, or the IBAN's in the 89 countries that used IBANs as of late 2024. Mix them up and a payment bounces or, worse, stalls in a correspondent queue. This page decodes each identifier, shows which one each kind of payment needs, and covers the national codes — sort codes, CLABEs, IFSCs — that payments to those countries often still require.

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.

The check digit is why a mistyped routing number is usually caught at once. Multiply the digits by 3, 7 and 1 in a repeating pattern — 3 × (digits 1, 4 and 7) + 7 × (digits 2, 5 and 8) + (digits 3, 6 and 9) — and a valid number always gives a total divisible by 10. Most payment forms run that test before anything is sent, so most single-digit typos are rejected on the spot; a valid but wrong number is the dangerous case.

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. DEUTDEFF, the example code in our own payout form, reads as DEUT (the bank), DE (Germany) and FF (Frankfurt).

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. Swift, the cooperative that runs the network, connects more than 11,500 institutions in 200-plus countries and territories; it carries the payment instructions, and the money itself settles through accounts the banks hold with each other.

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.

Read one and the structure is plain. A German IBAN such as DE89 3704 0044 0532 0130 00 is 22 characters: DE for the country, 89 as check digits that catch typos, then an 8-digit bank code and a 10-digit account number. Because the IBAN already contains the bank code, a euro payment inside SEPA needs only the IBAN — the BIC is optional.

What other bank codes will you meet abroad?

Many countries pair SWIFT for international wires with a national identifier for their own payment systems — and paying over those local systems usually needs only the national code. If you pay suppliers abroad, these are the formats you will meet most:

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.

What happens if you use the wrong code?

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.