Alex is Sprintlaw's co-founder and principal lawyer. Alex previously worked at a top-tier firm as a lawyer specialising in technology and media contracts, and founded a digital agency which he sold in 2015.
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Starting out as a sole trader is a popular, simple way to launch a business in Australia. You can move quickly, keep costs down and test your idea with real customers.
One of the first admin steps you’ll likely tackle is getting an Australian Business Number (ABN). While you can still carry on certain activities without an ABN, most people who are “carrying on a business” will need one-and not having it creates practical problems like tax withheld from your payments, difficulty registering for GST, and trouble with suppliers.
In this guide, we’ll explain what a sole trader ABN is, when you need one, the step-by-step application process, and how to stay compliant once you’re registered so you can get started with confidence.
What Is an ABN for a Sole Trader?
An ABN is an 11‑digit identifier issued by the Australian Business Register (ABR). If you operate as an individual (even if you’ll use a trading name), you’re a sole trader for legal purposes and your ABN links to you personally.
Your ABN helps other businesses, government agencies and customers identify you. It also streamlines payments and tax reporting-especially if you later register for GST.
For a quick overview of the pros and cons of using an ABN as an individual, many founders review the advantages and disadvantages of having an ABN before they apply.
Do You Need an ABN as a Sole Trader?
In Australia, you generally need an ABN if you are “carrying on an enterprise” (that is, running a business rather than pursuing a hobby). Indicators include providing goods or services for payment, advertising, having a business plan, or an intention to make a profit. If you’re unsure, it helps to understand what defines a business activity under Australian law.
Important: it’s not automatically illegal to do any work without an ABN. However, if you should have one and don’t, payers may withhold tax at the top marginal rate from your invoices, you won’t be able to register for GST, and suppliers and marketplaces may refuse to onboard you. In short, if you’re genuinely in business, an ABN makes day-to-day operations much smoother.
If you’re weighing up your options, this plain-English guide on whether you can run a business without an ABN explains the practical risks and common scenarios.
Step-By-Step: Apply for a Sole Trader ABN
The application is free and typically takes less than 20 minutes online. Here’s how to approach it, step by step.
1) Check That You’re Eligible
Ask yourself: am I actually running a business? If you’re marketing your services, quoting jobs, invoicing clients and aiming to make a profit, you’re likely carrying on an enterprise and should apply.
2) Gather Your Details
- Full legal name and date of birth
- Tax File Number (TFN)
- Business address and contact details
- A short description of your main business activity
- Start date for your activities
If you plan to trade under a name that isn’t your personal name, it’s smart to understand how an entity name vs business name works so you can pick and register the right trading name later.
3) Apply Online With the ABR
Go to the Australian Business Register application and select sole trader as your structure. The form will ask why you’re applying-use a simple description like “carrying on a business as a sole trader providing .”
Most ABNs are issued immediately. Occasionally, the ABR may review your application, which can take a few days.
4) Decide on a Trading Name (Optional)
If you want to trade as something other than your personal name, you’ll need to register a business name with ASIC after you receive your ABN. You can operate multiple business names under a single ABN if you run different brands or offerings. If you’re cross-checking availability or potential conflicts, it can help to know whether two businesses can have the same name in Australia.
5) Consider Your Tax Registrations
GST registration is mandatory once your GST turnover reaches $75,000 in a 12‑month period. You can register for GST at the same time as your ABN or later via the ATO once you’re approaching the threshold. If you intend to hire staff, you’ll also look at PAYG withholding and superannuation obligations.
Tax note: the information in this guide is general. For advice about your GST status, deductions and how to report income as a sole trader, speak with an accountant or registered tax agent.
6) Set Up Your Invoicing and Records
You can issue invoices with or without an ABN, but if you invoice without an ABN, payers may be required to withhold tax at the top marginal rate. If you are GST-registered, your invoices must meet “tax invoice” requirements. Regardless, keep clear records of income and expenses from day one.
After You Get Your ABN: Registrations, Records and Compliance
Landing your ABN is the start. A few practical steps will help you operate smoothly and stay compliant.
Update and Maintain Your ABN Details
Keep your ABN details current (address, contact info, business activity). Anyone can check your registration using ABN Lookup, and it’s handy to know how to check if an ABN is active when you’re onboarding suppliers too.
If you pause or cease trading, you can cancel your ABN. If you later restart, you can reapply. For common questions about renewals and status, see does an ABN expire.
Open a Dedicated Business Bank Account
While not mandatory for sole traders, a separate account makes cash flow and recordkeeping much easier. It also reduces errors at tax time.
Understand Invoicing and GST Rules
If you are not registered for GST, do not charge GST on your invoices. If you are registered, your invoices must be “tax invoices” and include your ABN, a description of what you supplied, the GST amount (or a statement that GST is included), and the date.
Use the Right Trading Name and Branding
Your legal name and your business name serve different purposes. A quick refresher on business name vs company name can help you set up your brand correctly as a sole trader (you won’t have a company name unless you incorporate).
Protect Your Brand and Content
Registering your brand as a trade mark (and using clear website terms) can prevent headaches as you grow. It’s much easier to protect your identity early than to rebrand later.
Privacy and Data
Under the Privacy Act 1988 (Cth), many small businesses with annual turnover of $3 million or less are not required to comply with the Australian Privacy Principles (there are important exceptions, such as health service providers or where you handle Tax File Number information). Even if you are not legally required, if you collect any personal information online-names, emails, phone numbers-having a clear, tailored Privacy Policy is best practice and often expected by customers and partners.
Consumer Law
If you sell goods or services, the Australian Consumer Law (ACL) applies to your advertising, refunds and warranties. Make sure your website and sales practices don’t mislead customers and that your policies match what the ACL requires.
Employment Basics
Hiring staff as a sole trader triggers obligations under the Fair Work system, including correct pay, superannuation and leave entitlements. Use proper Employment Contracts and keep accurate records from the start.
Essential Legal Documents for Sole Traders
You don’t need to drown in paperwork, but a few targeted documents can protect your cash flow, set expectations and reduce disputes.
- Client Terms and Conditions: The rules of engagement with your customers-scope, inclusions, payment, cancellations, liability and dispute resolution.
- Proposal or Quote Terms: If you sell services, set clear quote validity, variations and payment milestones to avoid scope creep.
- Website Terms: If you operate online, make sure your site has user rules and IP notices that are consistent with your offering.
- Privacy Policy: If you collect personal information, set out what you collect, why, and how you store and share it; a tailored Privacy Policy builds trust and helps meet your obligations where they apply.
- Supplier or Subcontractor Agreement: Lock in pricing, deliverables, IP ownership, confidentiality and termination rights with key suppliers.
- Employment or Contractor Agreement: If you bring in help, document duties, pay, IP and confidentiality properly to avoid disputes later.
- Non-Disclosure Agreement (NDA): Useful when sharing your pricing, processes or product ideas with potential partners.
Not every sole trader will need all of these from day one, but making sure your core contracts reflect how you actually operate will save time and protect your reputation.
Common Questions
How long does it take to get an ABN? Most applications are issued instantly if your details match ATO records; manual reviews can take longer.
Can one person have multiple ABNs? As a sole trader, you generally hold a single ABN, but you can register multiple business names under that ABN.
Can I put my home address on my ABN? Yes. You can use your residential address if you don’t have commercial premises.
Is a sole trader ABN the same as a company number? No. Sole traders use an ABN. Companies have both an ABN and an Australian Company Number (ACN). If you later incorporate, consider the benefits of working under an ABN versus moving to a company structure.
What happens if I don’t use my ABN? If you stop trading, you can cancel it and reapply later. If you’re unsure whether yours is current, there’s a quick way to see if an ABN is active.
Key Takeaways
- If you’re carrying on a business in Australia as an individual, you’ll generally need an ABN to operate smoothly and avoid payers withholding tax from your invoices.
- The ABN application is free, online and usually instant; have your TFN, contact details and business activity description ready.
- You can register a business name after you get your ABN, and it helps to understand entity name vs business name before you choose your trading name.
- Keep your details current, set up clear invoicing and records, and stay on top of GST and PAYG obligations-get tailored tax advice from an accountant for your situation.
- Protect your business with clear customer terms, supplier agreements and a tailored Privacy Policy where required, alongside strong website terms and employment documents as you grow.
- If you’re still deciding, weigh up the advantages and disadvantages of an ABN and the practical realities of trying to run a business without an ABN.
If you would like a consultation on starting your sole trader business, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.
