What is ABN?
Australian Business Number (ABN) is a compulsory registration for all businesses in Australia.
It is a unique 11-digit number given to each of the individual businesses by the Australian Business Register (ABR).
What is ACN?
Australian Company Number (ACN) is different from ABN. Unlike ABN, not all businesses need to have an ACN.
ACN is a 9-digit unique identification number issued by the Australian Securities and Investments Commission (ASIC