An International Bank Account Number, or IBAN, is a standardized account identifier used in more than 80 countries that lets a sending bank check your account details for errors before any money leaves. It is mandatory for euro transfers within Europe, and if you are sending or receiving money across borders to a country that uses the format, the IBAN is the single most important piece of account information you will handle.
How an IBAN Is Built
Every IBAN follows the same pattern under ISO 13616. It starts with a two-letter country code (DE for Germany, FR for France, GB for the United Kingdom), followed by two check digits, followed by the Basic Bank Account Number, or BBAN.1ISO (International Organization for Standardization). ISO 13616-1:2020 – Financial Services — International Bank Account Number (IBAN) — Part 1: Structure of the IBAN The BBAN holds the bank identifier that routes funds to the right institution and the individual account number itself.
Total length is fixed per country but varies between countries, up to a maximum of 34 characters.2Swift. IBAN Registry A few examples give a sense of the spread:
- Norway: 15 characters
- Germany: 22 characters
- France: 27 characters
- Malta: 31 characters
- Russia: 33 characters
Because the length is fixed, a German IBAN that isn’t 22 characters is wrong before you check anything else.2Swift. IBAN Registry
What the Check Digits Catch
The two check digits are calculated using a formula called Modulo 97. When you paste or type an IBAN into a transfer form, your bank’s system converts the letters to numbers, rearranges the string, and divides by 97. If the remainder is not 1, the IBAN is invalid and the transfer is rejected before any money moves.3Banco de España. Oooops! I Sent a Transfer to the Wrong IBAN This catches transposed digits, swapped characters, and simple typos.
Here is the gap that trips people up. Check digits only confirm the number is structurally valid. They do not verify that the account belongs to the person you intend to pay. If you enter a different but valid IBAN by mistake, the system cannot flag it. The money goes to whoever owns that account. Free online IBAN validators have the same limit: they confirm format, not ownership.
Which Countries Use IBANs
All countries in the Single Euro Payments Area (SEPA) are required to use IBANs for euro credit transfers and direct debits under EU Regulation 260/2012.4EUR-Lex. Regulation (EU) No 260/2012 – Technical and Business Requirements for Credit Transfers and Direct Debits in Euro The format has also been adopted across the Middle East, parts of Africa, Central Asia, and the Caribbean.
Several large economies do not use IBANs at all: the United States, Canada, Australia, New Zealand, China, and Japan. Transfers to those countries use the local routing format instead.
How the United States Fits In
U.S. banks do not issue IBANs for domestic accounts. Transfers inside the country use a nine-digit routing number (also called an ABA number) paired with the account number. For incoming international transfers, U.S. banks are identified by a SWIFT code, not an IBAN.5U.S. Bank. How Do I Receive a Wire Transfer?
That doesn’t make IBANs irrelevant to Americans. If you are sending money to someone in Europe or another IBAN country, you need the recipient’s IBAN along with the receiving bank’s SWIFT code to route the payment.6U.S. Bank. Crack the Swift Code for Sending International Wires Your own bank will not generate an IBAN for you to receive funds, but it will accept international wires using a SWIFT code and your account number.
Where to Find Your IBAN
If your bank issues IBANs, the number typically appears on your bank statements, often in the header or account summary. In online or mobile banking, look under account details, wire transfer settings, or a tab for international payments. Most apps include a copy button next to the IBAN so you don’t have to retype it. If none of those turn it up, call your bank’s customer service line.
What Else You Need to Send an International Transfer
Gathering everything before you start the form saves back-and-forth. Beyond the recipient’s IBAN, you will usually need:
- The recipient’s full legal name, matching the name on their bank’s records exactly. Even small discrepancies can cause the receiving bank to hold or return the funds after taking fees.
- The recipient’s address, required for anti-money-laundering compliance.
- The SWIFT/BIC code of the receiving bank. This is the Business Identifier Code under ISO 9362, which identifies the bank itself rather than the account. It is 8 or 11 characters; the first 8 identify the institution, and the optional last 3 identify a specific branch.7Swift. Business Identifier Code (BIC)
- The currency the recipient expects.
- A purpose of payment. Some countries require senders to categorize the transaction with a purpose code. India, for example, requires a specific alphanumeric code describing the reason for the payment.6U.S. Bank. Crack the Swift Code for Sending International Wires
If the payment will pass through an intermediary bank, your bank may ask for that intermediary’s SWIFT code too. The recipient’s bank should be able to provide the full chain.
What International Transfers Actually Cost
The flat fee is only part of what you pay. At major U.S. banks, the upfront charge for an outgoing international wire generally runs $25 to $75, with most falling in the $40 to $50 range. Some banks reduce or waive the fee when you send in a foreign currency rather than U.S. dollars.
The less visible cost is the exchange rate markup. When your bank converts dollars into the recipient’s currency, it rarely uses the mid-market rate you’d see on a financial news site. Banks add a margin, often 1% to 3% depending on the currency pair, the bank, and the size of the transfer. On a $10,000 payment, a 2% markup is $200 beyond the advertised wire fee. This is where most of the money quietly disappears in international transfers.
A third layer is intermediary bank fees. When a transfer passes through one or more correspondent banks, each can deduct a processing fee from the amount in transit, so the recipient receives less than you sent.8J.P. Morgan. Wire Transfers: How They Work, Security and Fees
Most banks let you choose how fees are split:
- OUR: you pay all transfer fees, including intermediary charges, and the recipient gets the full amount.
- SHA (shared): you pay your bank’s outgoing fee, and any intermediary or receiving bank fees come out of the transfer amount. This is the default at most institutions.
- BEN: all fees are deducted from the transfer, so the recipient absorbs everything.
If you need the recipient to receive an exact amount, choose OUR and expect a somewhat higher total.
Within Europe, SEPA transfers are a much cheaper option for euro-denominated payments. EU rules require cross-border SEPA transfers to cost no more than domestic ones, so they are often free or near-free. If you are sending euros between SEPA countries, using the SEPA network rather than a standard SWIFT wire can save real money.
How Long Transfers Take
International wires generally settle within one to three business days. The timeline depends on the destination, the number of intermediary banks, local banking holidays, and time zones.8J.P. Morgan. Wire Transfers: How They Work, Security and Fees Transfers to well-connected banking centers often arrive within a day; payments routed through multiple intermediaries, or to countries with fewer correspondent relationships, can take longer.
Your bank will generate a transaction reference after submission. Either party can use that reference to trace the payment if it is delayed. Keep the confirmation receipt as proof of payment; it can also be useful for tax reporting on foreign financial activity.
What Happens If You Send to the Wrong IBAN
If you mistype a digit and the check digits don’t validate, your bank’s system rejects the transfer immediately. No money moves. You correct the IBAN and resubmit. That is the common case and the whole point of check digits.3Banco de España. Oooops! I Sent a Transfer to the Wrong IBAN
The harder problem is a valid IBAN that belongs to someone else: maybe you copied the wrong number off an invoice, or a scammer intercepted an email and swapped in their own account details. The check digits pass, the transfer goes through, and the money lands in the wrong account. Your bank can send a cancellation request to the receiving bank, but success depends on whether the funds are still there. If the account holder has withdrawn or moved the money, the receiving bank will reject the recall.9SWIFT. Market Practice Guidelines for the Cancellation of Suspected Fraudulent Transactions The receiving bank has no obligation to cover the shortfall.
Prevention beats recovery. Verify the IBAN through a separate channel before sending a large payment. If someone emails you new bank details, call them on a known number to confirm. Invoice fraud, where a scammer intercepts legitimate correspondence and changes the bank details, is one of the most common wire fraud schemes, and the loss almost always falls on the sender.
U.S. Reporting If You Hold Foreign Accounts
If you are a U.S. person holding accounts abroad that use IBANs, two federal reporting obligations may apply. Missing them can cost far more than any wire fee.
The first is the Report of Foreign Bank and Financial Accounts (FBAR), filed as FinCEN Form 114. You must file if the combined value of all your foreign financial accounts exceeds $10,000 at any point during the calendar year. That covers checking, savings, and investment accounts at foreign banks. The FBAR is due April 15 following the calendar year, with an automatic extension to October 15 (no request required).10Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)
The second is IRS Form 8938 under the Foreign Account Tax Compliance Act (FATCA). The thresholds are higher and depend on your filing status and where you live. For unmarried taxpayers in the United States, the filing requirement starts when your specified foreign financial assets exceed $50,000 on the last day of the tax year or $75,000 at any point during the year. For joint filers in the United States, the thresholds are $100,000 and $150,000. U.S. taxpayers living abroad get substantially higher thresholds, up to $400,000 on the last day of the year for joint filers.11Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets?
The FBAR and Form 8938 are separate filings with different thresholds and different destinations. The FBAR goes to FinCEN; Form 8938 goes to the IRS with your tax return. Depending on the size of your foreign accounts, you may need to file both. Penalties for non-compliance are steep, particularly for willful failures, so this is worth getting right the first year you open a foreign account.