Australian Business Number

The Australian Business Number, or ABN, is a unique identifier issued by the Australian Business Register (ABR) which is operated by the Australian Taxation Office (ATO). The ABN is a component of the reform known as A New Tax System introduced by John Howard's Liberal government on 1 July 2000.

Read more about Australian Business Number:  Australian Business Register, Entitlement To An ABN, Applying For An ABN, Format of The ABN

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