26 October 2015 - An Australian business number or ABN is a unique 11 digit number that identifies your business or organisation to the government and community.
Not everyone needs an ABN and not everyone is entitled to one, but if you’re starting up or running a business you will need to register for one.
Registration is free through the Australian Business Register (ABR).
When you register for an ABN you can also:
Your ABN registration details are stored in the ABR. Agencies across all levels of government use ABR data to better target service delivery activities.
You can access the publicly available information contained in the ABR through ABN LookupExternal Link.
Find out if you are entitled to an ABN