Australian Business Number (ABN)

Australian Business Number (ABN) is an 11-digit number which is uniquely issued for every applicant by the Australian Business Register (ABR), the business registration body which works under the supervision and control of the Australian Taxation Office (ATO).

ABN is used when the holder aims to

  • Be identified as a business entity when trading
  • Distinguish tax on amounts received through business activities from Pay as You Go (PAYG) tax
  • Receive the Goods and Services Tax (GST) credits as inputs
  • Be credited for energy grants
  • And apply for the Australian domain name.

Note: ABN is not a substitute for Tax File Number (TFN).


Applying for ABN:

ABN application can be done free of charge within a few minutes via Australian Business Register website.


All individuals, companies, partnerships and any other organisations are entitled to apply for ABN provided that any of the following conditions are met:

  • An enterprise working in Australia, or
  • An enterprise whose supplies are connected with Australia, or
  • A registered company under the Corporations Act 2001


Note: If your ABN application is refused, ABR will send a letter explaining the reasons for the rejection.


ABN and Business Name Registration:


ABN and business name registration can be applied simultaneously, however, your business name can be registered only by going to the Australian Securities and Investments Commission (ASIC) after having your ABN.


Changes in Your Business Details:


In the case of any changes to your business details, you have to inform ABR within 28 days from the day you are aware of the changes.


If the changes are in your business structure, you have to cancel your ABN and apply for a new ABN.


Business structure changes occur in the following cases:

  • Sole trader to a company
  • Sole trader to partnership
  • Partnership to company


Also, your ABN must be cancelled when the business is closed down.


The quickest way to make all above-mentioned changes and applications is through Etax Plus. Please contact us on 1300 221 125 now.


 ABN Lookup Tool:


ABN Lookup