The Bank BSB Number is a 6 digit bank code assigned to Australian banks by Australian Payments Clearing Association (APCA). A BSB Number identifies the financial institution (bank), state and the branch to which a payment item is directed and thus called BSB (Bank-State-Branch). Along with the account number, BSB number is essential for delivering payments through the clearing system. However, note that BSB Numbers with account numbers combinations are used only for domestic transactions in Australia.
Format of BSB Numbers
The 6 digit BSB number is made up of three parts:
AAB-CCC
The first two numbers (AA) specify the financial institution/bank. For example, the bank code for
Bankwest (a division of Commonwealth Bank of Australia) (BWA) is
30
The third number (B) indicates the state where the branch is located. For example,
WA has the state code of
6
The last three numbers (CCC) are the unique identifier for a branch. For example,
Bankwest (a division of Commonwealth Bank of Australia) Bank's
Affinity Banking Branch has the unique identifier of
141
Thus the BSB Number for Affinity Banking of Bankwest (a division of Commonwealth Bank of Australia) in Perth, WA is
306-141