BBAN
What is BBAN?
A basic bank account number (BBAN) is the part of a bank account identifier that a country uses inside its own domestic payment system. It packs the codes that point to a specific bank, branch, and individual account into the format defined by that country's banking rules. The BBAN also forms the core of the , the international account format used to route cross-border payments.
Because most countries designed their account numbering before international standards existed, BBAN formats aren't the same everywhere. One country may encode a and a branch number, while another arranges that information differently. The IBAN standard wraps the existing BBAN in a common structure so banks abroad can read it without replacing their domestic systems.
Key facts
- BBAN stands for basic bank account number.
- It identifies an account within a single country's domestic banking system.
- Its layout typically includes a bank code, a branch indicator, and the account number.
- The format, length, and character set are set by each country, so they vary internationally.
- An IBAN is built by adding a two-letter country code and two check digits in front of the BBAN.
How a BBAN is structured
A BBAN is read left to right as a sequence of fixed-position fields. The exact fields depend on the country, but most national formats follow the same logic:
- Bank code – identifies the institution that holds the account, similar in purpose to a .
- Branch code – points to the specific branch or sort code, where the national system uses one.
- Account number – the unique number for the individual account at that bank.
- Check digit – one or more validation digits that let software catch a mistyped number before a transfer is sent.
When an account is used internationally, the full BBAN is placed after the country code and IBAN check digits to create the complete IBAN. Cross-border schemes such as rely on this structure, and messaging standards like carry the resulting account details across the network.
BBAN vs IBAN
The two are easy to confuse because the BBAN sits inside the IBAN.
| BBAN | IBAN | |
| Scope | Domestic, within one country | International, across borders |
| Structure | Bank code, branch, and account number in the national format | Country code, two check digits, then the full BBAN |
| Defined by | National banking standards | ISO 13616 |
| Primary use | Domestic transfers and account identification | Cross-border and SEPA payments |
