ABNs explained


An ABN is a unique 11 digit number that identifies your business to the government and community. You can use an ABN to:

  • identify your business to others when ordering and invoicing
  • avoid pay as you go (PAYG) tax on payments you get
  • claim goods and services tax (GST) credits
  • claim energy grants credits
  • get an Australian domain name
Registering for an ABN through the Australian Government’s Business Registration Service is free.

Find out if you need an ABN


Not everyone needs an ABN. To get one you need to be running a business or other enterprise.

Visit the Australian Business Register (ABR) website to find out about your entitlement to an ABN.

If you apply for an ABN and you’re not entitled to one, your application may be refused. The reason for refusal will be explained to you by the Australian Taxation Office.

Before you register for an ABN, make sure you’ve got the required information.

Register for an ABN

You can apply for an ABN and other key business registrations through the Business Registration Service. Before you register, make sure you have:

  • identified your business structure
  • proof of identity
  • details of your business activities and associates ready
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