What an ABN is and who needs one
An Australian Business Number (ABN) is an 11-digit identifier for your business, issued and managed by the Australian Business Register (ABR). You need one if you are carrying on an enterprise in Australia — running a business, contracting, or operating as a sole trader. It lets you invoice properly, register for GST, avoid having tax withheld at the top rate, and deal with other businesses and the ATO.
Before you start: what you’ll need
Applying is quicker if you have your details ready:
Your tax file number (TFN) and those of any associates.
Your business structure (sole trader, partnership, company or trust).
Details of your business activity and start date.
Your contact and location details.
If you have registered a company, your ACN or ARBN.
Step-by-step: applying for your ABN
Go to the Australian Business Register at abr.gov.au and choose to apply for an ABN. The official application is free — you do not need to pay a third party.
Confirm your eligibility and structure. The form checks that you are entitled to an ABN and asks how your business is set up.
Enter your details. Provide your identity information, TFN, business activity, start date and contact details.
Review and submit. Check everything is accurate — errors slow things down.
Receive your ABN. If your identity and details can be verified, you often get your ABN straight away. If the ABR needs to review anything, it can take up to 28 days, and they will contact you if more information is required.
Watch out for third-party fee sites
Applying directly through the ABR is free. Some private sites charge a fee to lodge the same application on your behalf. There is nothing illegal about that, but you are paying for a form you can complete yourself at no cost. Always check you are on the official abr.gov.au site.
What to do after you get your ABN
An ABN is a starting line, not a finish line. Once you have it, you may need to register a business name with ASIC (if you trade under a name that is not your own), register for GST if your turnover meets the threshold [VERIFY current fee/threshold], set up business banking, and — critically — get online. Customers now find and vet businesses on the web and through AI assistants before they ever call. A simple, professional website and a Google Business Profile turn your new ABN into actual enquiries.
