An IBAN is a standardized account number that banks use to route money between countries

An IBAN (International Bank Account Number) is a long string of letters and numbers that identifies your specific bank account for international transfers. It combines your country code, bank routing information, and account number into one format so money can move reliably across borders without getting lost or delayed.

If you send or receive money internationally, you will need an IBAN. Domestic transfers within the United States use a different system (routing numbers and account numbers stay separate), but most other countries rely on IBANs for all transfers, domestic and international. Banks outside the US almost always ask for an IBAN before they will move your money.

The IBAN format varies by country. A UK IBAN is 22 characters long. A German IBAN is 22 characters. A French IBAN is 27 characters. The first two characters are always the country code (GB for United Kingdom, DE for Germany, FR for France), followed by two check digits that help catch typos, then the bank and account details specific to that country.

Key Takeaways

  • An IBAN is required for international bank transfers and is standard in most countries outside the United States.
  • The IBAN format changes by country but always starts with a two-letter country code followed by two check digits.
  • You can find your IBAN on your bank statement, through your online banking portal, or by calling your bank directly.
  • A single typo in an IBAN can send your money to the wrong account or cause the transfer to be rejected entirely.
  • The US does not use IBANs for domestic transfers; it uses routing numbers and account numbers instead.

How an IBAN is structured and what each part means

Every IBAN breaks down into four parts. The first two characters are the country code — the ISO 3166-1 alpha-2 code for the country where the bank is located. The next two characters are check digits, a mathematical verification that catches common entry errors. The remaining characters are the Basic Bank Account Number (BBAN), which contains the bank code and the individual account number in whatever format that country uses.

Take a real example: GB82 WEST 1234 5698 7654 32. This is a UK IBAN. GB is the country code (United Kingdom). 82 are the check digits. WEST is the bank code (for Westpac, a major UK bank). 1234 5698 7654 32 is the account number. The spaces are optional — banks accept them with or without spaces, but the letters and numbers must be exact.

The check digits exist to prevent you from accidentally typing a valid-looking but wrong IBAN. If you transpose two numbers or mistype a letter, the check digit calculation will fail, and the receiving bank's system will reject the transfer before it leaves your account. This is a safety feature, not a may provide — a completely different valid IBAN will still go through, but most common typos are caught.

Where to find your IBAN

Your bank will provide your IBAN in several places. The easiest is usually your online banking portal — log in, go to account details or account information, and the IBAN will be listed there. Many banks also print it on your bank statements, either at the top of the page or in a section labeled "Account Details" or "International Transfers."

If you cannot find it online or on paper, call your bank's customer service line and ask for your IBAN. Have your account number and personal identification ready. They will give it to you over the phone or email it to you. Some banks also allow you to request it through their mobile app.

Do not guess or construct an IBAN yourself. Banks have specific rules for how they format IBANs, and a made-up number that looks right will either be rejected or — in rare cases — route to someone else's account. Always get it directly from your bank or from an official bank document.

IBAN versus other international transfer identifiers

Outside the United States, the IBAN is the standard. Inside the US, banks use a different system: a nine-digit routing number (also called an ABA number) and your account number. If you are sending money from a US bank to an international account, you will provide your US routing number and account number to the sender, not an IBAN.

Some countries also use a SWIFT code (also called a BIC code) alongside the IBAN. The SWIFT code identifies the specific bank branch, while the IBAN identifies your account within that bank. If you are sending money internationally, you may need both — the IBAN for the account and the SWIFT code for the bank. Your bank will tell you which one is required for the transfer you are making.

A few countries use other systems entirely. Canada uses routing numbers similar to the US. Australia uses a Bank State Branch (BSB) code. But if you are dealing with a European, UK, or most other international banks, IBAN is what they will ask for.

What happens if you give the wrong IBAN

If the IBAN is invalid (contains a typo or wrong check digits), the transfer will usually be rejected before it leaves your account. Your bank's system will flag it as incorrect, and you will be asked to correct it. The money stays in your account, and you can try again with the right number.

If the IBAN is valid but belongs to someone else's account, the money may go through. This is rare but possible. Once the transfer completes, recovering the money is difficult and slow. You would need to contact your bank, provide proof of the error, and ask them to initiate a reversal. The receiving bank would then have to contact the account holder and ask them to return the funds. This process can take weeks or months, and there is no may provide the other person will cooperate.

Always double-check the IBAN before you confirm a transfer. Copy it directly from your bank's official source or from a document the recipient sent you. Do not retype it from memory or from a text message. A single character wrong can cause serious problems.

IBAN requirements for different types of transfers

If you are receiving money from abroad into a US bank account, you will give the sender your US routing number and account number, not an IBAN. US banks do not issue IBANs for domestic accounts. However, if you have a bank account outside the US, you will use an IBAN for any transfer into or out of that account.

If you are sending money from your US bank to someone abroad, you will need their IBAN (and possibly their SWIFT code). Your US bank will ask for it during the transfer setup. If you are sending money between two accounts outside the US, both accounts will have IBANs, and you will need the recipient's IBAN to complete the transfer.

Some money transfer services like Wise or OFX also ask for IBANs when you are sending money internationally. They use the IBAN to route the money to the correct bank and account, just as your bank does. The process is the same: provide the correct IBAN, verify it, and the transfer goes through.

Frequently Asked Questions

Is an IBAN the same as an account number?

No. An IBAN includes your account number but also includes your country code, bank code, and check digits. It is a longer, standardized format designed for international transfers. Your account number alone is not enough for a cross-border payment.

Do I need an IBAN if I am sending money within the United States?

No. US domestic transfers use routing numbers and account numbers, not IBANs. You only need an IBAN if you are sending money to or receiving money from a bank account outside the US.

What is the difference between an IBAN and a SWIFT code?

An IBAN identifies your specific account. A SWIFT code identifies the bank branch. For international transfers, you may need both — the SWIFT code tells the money which bank to go to, and the IBAN tells that bank which account within the bank should receive it. Some transfers require only the IBAN; your bank will tell you what is needed.

Can I change my IBAN?

No. Your IBAN is tied to your specific account at your specific bank. If you close the account, the IBAN becomes inactive. If you open a new account, you get a new IBAN. You cannot request a different IBAN for the same account.

What if someone asks me for my IBAN over email or text?

Be cautious. Legitimate businesses and individuals may ask for your IBAN to send you money, but scammers also use this request to gather information for fraud. If you are not expecting a payment, do not share your IBAN. If you are, verify the request through an official channel — call the company directly or check their official website before responding.