ABR Help Topics
The Australian business number (ABN) is a unique 11 digit identifier that makes it easier for businesses and all levels of government to interact.
It is not compulsory to have an ABN, but it is an essential component for businesses to operate within the goods and services (GST) system. If you are registered for GST, you will need to put your ABN on your invoices to make them 'tax invoices'.
Examples of when you may need to use your ABN include:
The electronic version of this document is the only authorised version.
Last updated: 17/11/2010
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