An International Bank Account Number (IBAN) is a standardized identifier for a bank account. It helps banks communicate and process payment details, especially for cross-border transfers. An IBAN combines a country code, check digits and a country-specific account number; its length and exact pattern depend on the country.
What an IBAN identifies
An IBAN identifies an individual account at a financial institution in a particular country. It is designed to make account details readable and processable across payment systems, and it may also be used for domestic payments. It does not, by itself, identify the account holder or prove that an account is open.
The International Organization for Standardization’s current standard, ISO 13616-1:2020, specifies IBAN elements to facilitate international data interchange. ISO lists the second edition, published in September 2020, as reviewed and confirmed in 2026.
How an IBAN is structured
The general structure is a two-letter country code, two check digits and a Basic Bank Account Number (BBAN). The BBAN follows the country’s national format and includes a bank identifier at a country-defined position. Under SWIFT’s registry specification, a BBAN may contain up to 30 alphanumeric characters.
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- Country code: Two letters corresponding to the country.
- Check digits: Two digits used in a mathematical validation check.
- BBAN: The country-specific account component, whose length and character pattern vary.
In registry notation, ! marks a fixed length, n means digits, a means uppercase letters and c means alphanumeric characters. SWIFT’s IBAN Registry version 101, issued in December 2025, illustrates the format with country entries, including a 24-character IBAN for Andorra. That example is specific to Andorra, not a template for other countries.
Why IBAN length varies by country
Countries agree on their own IBAN format and fixed length, so there is no single length that applies to every IBAN. To check a particular country’s expected pattern, consult the relevant entry in SWIFT’s registry. SWIFT’s standards page lists registry release 103 as updated 17 September 2026; use that current release for operational country-specific details because entries can change. The version 101 PDF linked above is useful for understanding the structure, but it is not the latest release.
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SWIFT is the ISO 13616 Registration Authority. National standards bodies or central banks submit agreed national formats, and SWIFT publishes the registry. Its IBAN explainer describes the purpose as facilitating communication and processing of cross-border transactions.
What an IBAN check-digit validation tells you
The check digits use the MOD97-10 scheme. A format and check-digit test can show that a string conforms to specified structural and mathematical rules; it cannot confirm that the account exists, is open, belongs to the person named as the recipient or will accept a payment. A transfer’s success depends on more than an IBAN passing a validation check.
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For that reason, a country code and valid-looking string are not a substitute for verifying payment instructions with the intended recipient or through a trusted channel. Use the account details supplied by the recipient’s bank or other reliable source rather than trying to construct an IBAN yourself.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.IBAN and BIC are different identifiers
| Identifier | What it identifies |
|---|---|
| IBAN | An individual bank account in a particular country. |
| BIC | A payment-service provider. |
They are distinct identifiers. Some payment instructions may ask for both, depending on the bank and payment route; follow the requirements shown by the sending bank. The EU’s Regulation (EU) No 260/2012 defines IBAN in the context of an individual payment account in a Member State. That is a legal definition within the regulation’s scope, not a universal rule for every payment system or country.
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