Starting a business is exciting, but the paperwork can feel confusing. Your Australian Business Number (ABN) sits at the centre of it all. This guide explains how to apply for an ABN, who is eligible and how your structure, GST, TFN and business name fit together. You will also learn what to set up once your ABN arrives.
- Applying for an ABN through the Australian Business Register is free.
- Choose your business structure before you apply, since it affects every later step.
- You need a TFN before you apply for an ABN.
- Register for GST once turnover reaches $75,000, or from day one for taxi and rideshare.
- An ABN does not register your business name. That is a separate step with ASIC.
What Is an ABN and Why Do You Need One?
An ABN is a unique 11-digit number that identifies your business to the government and to other businesses. You use it on invoices, quotes and tax documents. Suppliers and clients also ask for it.
Without an ABN, other businesses may withhold tax from your payments. You also cannot claim GST credits or register a business name. Getting your ABN early avoids these problems from day one.
Who Is Eligible for an ABN
You qualify for an ABN if you run a business or enterprise in Australia. The ATO looks at whether you operate with a profit motive, repeat your activities and run in a businesslike way.
Casual hobbies do not qualify. Employees working for a single employer also do not need an ABN for that wage income. However, contractors, freelancers, tradies and sole traders usually do.
You must also hold a tax file number (TFN) and meet identity requirements. The ATO will check your details against its records, so enter them exactly.
How to Apply for an ABN, Step by Step
The application is free through the Australian Business Register (ABR). Follow these steps:
- Choose your business structure (see the next section).
- Gather your TFN, personal identity details and business address.
- Describe your business activity and expected start date.
- Submit the application on the ABR website.
- Receive your ABN, often immediately if your details match.
Avoid third-party sites that charge a fee. The official application costs nothing. If you want guidance from the start, a clear ABN registration walkthrough helps you avoid common mistakes, such as picking the wrong structure or entering mismatched details.
Sole Trader vs Company vs Trust
Your structure shapes your tax, risk and paperwork. Pick it before you apply, because it affects every later step.
| Structure | Who Owns It | Tax Treatment | Key Consideration |
|---|---|---|---|
| Sole trader | One individual | Income taxed on your personal return | Simple and cheap, but you carry personal liability |
| Company | A separate legal entity | Taxed at the company rate | Limits liability, but costs more to run |
| Trust | A trustee holds assets for beneficiaries | Income distributed to beneficiaries | Flexible, but needs a trust deed and careful records |
Sole traders use their own TFN and apply for an ABN directly. Companies register with ASIC first and receive an ACN, then they apply for an ABN. Each company director also needs a director ID. Trusts need a trust deed and their own TFN. Ask an accountant before you choose, since changing structure later costs time and money.
How GST, TFN and Business Name Registration Fit In
These three items often cause confusion. Each one does a different job.
- TFN. Your tax file number identifies you or your entity for income tax. You need one before you apply for an ABN.
- GST. You must register for GST once your turnover reaches $75,000 a year. You can register earlier if you want to claim GST credits on your purchases. Taxi and rideshare drivers must register from day one, regardless of turnover.
- Business name. If you trade under a name other than your own, you must register it with ASIC. An ABN does not give you ownership of a name. Check that the name is available first.
For trade businesses, early setup matters even more. Working with a bookkeeper for tradies helps you handle GST, job costs and BAS correctly from your very first invoice.
What to Set Up After You Get Your ABN
Your ABN is the starting line. Next, set up the systems that keep you compliant:
- A business bank account. Keep personal and business money separate.
- Bookkeeping software. Link your bank feed and code expenses weekly.
- Invoicing. Include your ABN and, if registered for GST, the words “tax invoice”.
- Payroll. Register for PAYG withholding before you hire staff.
- Tax obligations. Plan for BAS, income tax and super if you have employees.
Hiring your first employee adds more rules, including Single Touch Payroll, super and award pay. Reliable payroll for small businesses keeps those obligations on track as your team grows.
Set aside tax money as you earn. A separate savings account for GST and income tax prevents unpleasant surprises at BAS time.
Start Your Business on the Right Foot
We help you choose the right structure, register your ABN, GST and business name, and set up Xero, invoicing and payroll from day one. New businesses across Sydney work with us from our North Strathfield and Liverpool offices.
Frequently Asked Questions
How long does it take to get an ABN?
Many applications finish immediately online. If the ATO needs to verify your details, it may take up to 28 days.
Do I need an ABN to be a sole trader?
In most cases, yes. An ABN lets you invoice clients, avoid tax withholding on payments and register for GST when required.
Does my ABN cost anything?
No. Applying through the Australian Business Register is free. Be careful of websites that charge for the same service.
Does an ABN register my business name?
No. If you trade under a name other than your own, you must register it separately with ASIC. Your ABN only identifies your business for tax and dealings with others.
Can I apply for an ABN before I start trading?
Yes, as long as you are genuinely starting a business. You can enter an expected start date on the application and set up your systems before your first sale.