US banks do not use IBAN numbers for domestic transfers
The United States has its own routing system that predates IBAN by decades. When you send money within the US, your bank uses a routing number (also called a routing transit number or RTN) and your account number. These two pieces of information do the same job that an IBAN does in other countries — they identify your bank and your specific account.
IBAN stands for International Bank Account Number. It was created in the 1990s to standardize cross-border payments in Europe and has since spread to most countries outside North America. The US never adopted it because the routing number system was already working well for domestic payments, and the American Bankers Association saw no reason to replace it.
If you are sending money to someone in another country, or receiving money from abroad, the picture changes. Some US banks can generate an IBAN for international transfers, but this is not standard practice and depends on your bank.
Key Takeaways
- US domestic transfers use routing numbers and account numbers, not IBANs, and this system works for all payments within the country.
- A routing number is a nine-digit code that identifies your specific bank branch; your account number identifies your account at that branch.
- Most US banks cannot generate an IBAN because they do not need one for domestic use, and the US banking system does not require them.
- If you need to receive an international wire transfer, contact your bank to ask whether they can provide an IBAN or if they use a different system like SWIFT codes.
- Wire transfers into the US typically use a SWIFT code (which identifies the bank) plus your routing number and account number, not an IBAN.
How routing numbers work in the US banking system
Every US bank has a routing number assigned by the Federal Reserve or the American Bankers Association. This nine-digit code tells the payment system which bank to send money to. The first four digits identify the Federal Reserve district; the next four identify the specific bank; the last digit is a check digit that verifies the number is correct.
When you make a domestic transfer — whether by check, ACH (automated clearing house), or wire — you provide your routing number and account number. The receiving bank's routing number and account number go on the other side. The payment clears through the Federal Reserve's network, which has been handling this for over a century.
You can find your routing number on the bottom left of any check you write, or by calling your bank or logging into your online banking portal. It is specific to your bank and branch, though some banks use the same routing number for all their branches nationwide.
When you might need an IBAN as a US customer
If you are receiving money from someone in Europe, Asia, or most other regions, they may ask you for an IBAN. Some US banks can provide one, but many cannot. The reason is that IBANs are not part of the US banking infrastructure — they exist for countries that use the IBAN standard.
A few large US banks, particularly those with significant international operations, have set up systems to generate IBANs for their customers. These IBANs are usually structured to include your routing number and account number in a format that international senders can use. However, this is a courtesy service, not a requirement.
If your bank cannot provide an IBAN, the international sender should use your bank's SWIFT code (also called a BIC code) along with your routing number and account number. SWIFT codes are the international standard for identifying banks, and every US bank has one.
SWIFT codes versus IBANs for international transfers
A SWIFT code is an eight or eleven-character code that identifies your bank internationally. It is the standard way for foreign banks to route money to US banks. You can find your bank's SWIFT code by searching online or asking your bank directly.
When someone sends you money from abroad, they typically need three pieces of information: your bank's SWIFT code, your routing number, and your account number. Some banks ask for all three; others ask for just the SWIFT code and account number. The exact requirement depends on the sending bank's system and the country the money is coming from.
An IBAN, by contrast, is a single standardized number that contains all the routing information in one place. This works well in Europe and other IBAN-using regions, but the US never needed it because the routing number system was already established.
What to do if someone asks for your IBAN
If an international sender asks for your IBAN, contact your bank first. Explain that you need to receive a wire transfer and ask whether your bank can provide an IBAN. If they can, they will give you one. If they cannot, ask for your bank's SWIFT code, your routing number, and confirm your account number — these are the pieces the sender will need instead.
Write down all three pieces of information clearly and double-check them before sending them to the sender. A mistake in any of these numbers can cause the transfer to be delayed or sent to the wrong account. Once the sender has the correct information, the transfer typically takes three to five business days to arrive.
Do not assume that a sender who asks for an IBAN is scamming you — many legitimate international businesses and individuals use IBAN as their standard request. But do verify that you are giving information to the person you think you are, especially if the request comes via email.
International transfers out of the US
If you are sending money to someone in another country, you will need their IBAN (if they are in a country that uses IBANs) or their equivalent account identifier. Your US bank will ask you for the recipient's name, address, bank name, and IBAN or account number, plus the recipient bank's SWIFT code.
Outgoing international wire transfers from US banks typically cost between $15 and $50, depending on the bank and the destination country. The transfer usually takes three to five business days, though some banks offer expedited options for an additional fee. Exchange rates vary by bank and by the time of day you send the transfer.
Some US banks also offer services like ACH transfers to Canada or Mexico, which are cheaper and faster than wire transfers but only work to those specific countries. Ask your bank what options they offer for the country you are sending to.
Frequently Asked Questions
Can I use my routing number as an IBAN?
No. Your routing number and account number together serve the same purpose as an IBAN, but they are not formatted as an IBAN and international banks will not recognize them as one. If you need to provide an IBAN, ask your bank whether they can generate one. If not, provide your SWIFT code, routing number, and account number separately.
Do all US banks have SWIFT codes?
Yes. Every US bank that handles international transfers has a SWIFT code assigned by the Society for Worldwide Interbank Financial Telecommunication. You can find your bank's SWIFT code on their website, by calling them, or by searching online for "[Bank Name] SWIFT code".
What happens if I give someone the wrong routing number?
The transfer may be delayed while the sending bank tries to locate the correct account, or it may be returned to the sender. If this happens, contact your bank and the sender's bank to trace the transfer. Provide the correct routing number and account number so the sender can resubmit the transfer.
Is it safe to share my routing number and account number?
Your routing number is public information — it is printed on every check and is not secret. Your account number is more sensitive, but sharing both together with a trusted sender for a legitimate transfer is standard practice. Never share this information via unsolicited email or text, and verify you are communicating with the person you think you are.
Can I receive money from Europe without an IBAN?
Yes. European banks can send money to US banks using the SWIFT code plus routing number and account number. However, some European senders may not be familiar with this process and may insist on an IBAN. If your bank can provide one, it simplifies the transfer for the sender.