What is the difference between an ABN and an ACN?

Question

An ABN (Australian Business Number) identifies any business entity for tax and trading, while an ACN (Australian Company Number) uniquely identifies registered companies under ASIC regulation.

Alinta Williams · Answer

An ABN (Australian Business Number) is an 11-digit identifier used by all business structures—including sole traders and partnerships—for tax and government dealings. An ACN (Australian Company Number) is a specific 9-digit number issued exclusively to registered corporate entities. While companies need both, sole traders only require an ABN.

What is the difference between an ABN and an ACN?

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