What Is an ABN?
An Australian Business Number (ABN) is a unique 11-digit identifier issued by the Australian Business Register (ABR). It's how the government, other businesses, and the tax system identify your business. Think of it as your business's ID number.
As a sole trader, your ABN is linked directly to your individual Tax File Number (TFN), but it's a separate number used specifically for business dealings.
Who Needs an ABN?
You need an ABN if you're carrying on a business in Australia. The key word here is "business" — the ATO distinguishes between a hobby and a business based on several factors:
- You have a genuine intention to make a profit
- You operate in a businesslike manner (keeping records, having a plan)
- You repeat and regularly engage in the activity
- The activity is of a commercial nature
If you're a freelancer, contractor, tradesperson, or anyone offering goods or services commercially, you almost certainly need an ABN.