A BSB (Bank State Branch) is a six-digit code used to identify the individual branch of an Australian bank or financial institution. It is used in addition to the bank account number to identify the recipient of a transfer. The BSB identifier consists of six numerals, the first two or three of which is a bank identifier. The first two digits indicate the "bank," and the other four digits specify the "branch" of that financial institution, the first digit of which was the state code indicating the state where the branch was located. Some banks may use only one BSB for all branches, while others have different codes for each branch. BSB numbers are commonly used for domestic transactions within Australia.

To find a BSB number, you can look at recent bank statements or log into your banks online portal for your account details. You can also contact your banks customer service to confirm. If you need to send money to an Australian account from outside the country, you dont need to use a BSB code, as the SWIFT code contains the same information.