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 your own business or moving into self-employment is exciting - and yes, a little daunting. For many Australians, the first practical step is applying for an Australian Business Number (ABN) and operating as a sole trader.
So what are the real benefits of working under an ABN? How does it affect your tax, the way you invoice, and your legal obligations? And what do you need in place from day one to stay compliant and protect your business?
In this guide, we’ll break down what working under an ABN actually means, the key advantages for sole traders, how tax works, a simple setup checklist, and the core legal requirements and documents to consider. If you want to launch your venture with confidence, let’s get into it.
What Does Working Under An ABN Mean?
An ABN (Australian Business Number) is an 11‑digit identifier that tells clients, suppliers and government agencies that you’re carrying on a business in Australia. If you’re a sole trader, your ABN is your primary business ID - you’ll include it on invoices, quotes and contracts.
You’re generally expected to have an ABN if you’re carrying on a business or enterprise (not just a hobby), regularly invoicing for goods or services, or need to register for GST. If you’re unsure whether your activities amount to a business, it helps to understand the definition of a business activity in Australia.
It’s also worth weighing up the advantages and disadvantages of having an ABN so you can make an informed decision about timing and your wider business plan.
The Key Benefits For Sole Traders
Registering for an ABN can unlock a range of practical and legal advantages for sole traders. Here are the big ones.
1) Professional Credibility
Displaying an ABN signals that you’re a legitimate business. Many clients (especially larger companies) will only engage suppliers who provide an ABN, and it makes opening trade accounts with wholesalers and platforms much smoother.
2) Ability To Register A Business Name
With an ABN, you can register a business name and trade under a brand instead of your personal name. If you’re ready to build a brand, registering your business name is a simple step that helps with marketing and recognition.
3) Cleaner Invoicing (No Default Withholding)
If you invoice without an ABN, other Australian businesses may be required to withhold tax from your payment at the top marginal rate. Including your ABN on invoices avoids this default withholding and helps keep your cash flow predictable. If you’ve been operating without one, read more about the risks of trying to run a business without an ABN.
4) Access To Wider Contracts And Supply Chains
Government agencies and many large organisations require contractors to have an ABN. Registering can open doors to tenders, panels and ongoing contracts that wouldn’t otherwise be available.
5) Streamlined Record-Keeping
Working under an ABN makes it easier to separate business and personal finances, which supports cleaner bookkeeping and smoother tax time. Simple habits (like using a dedicated bank account) go a long way to reducing admin headaches.
6) GST Registration (When Required)
There’s no threshold for getting an ABN itself, but there is a GST turnover threshold. If your business has a GST turnover of $75,000 or more per year, you must register for GST - and you’ll need an ABN to do it. You can also opt in to GST voluntarily if it suits your business model.
7) Stronger Brand Protection Foundations
Once you’re trading, you can take steps to secure your brand, such as registering your trade mark for your name or logo. If brand protection is a priority, consider applying to register your trade mark early.
How Does An ABN Affect Tax In Australia?
Tax is often the biggest unknown for new sole traders. Here’s the practical overview.
How ABN Income Is Taxed
Income you earn in your sole trader business is “business income” and is reported in your individual tax return each year. If you also have a job, your ABN income is added to your salary or wages and taxed at your overall marginal rate.
Unlike an employee, tax is not automatically withheld from your ABN income during the year. Depending on your situation, you may be placed into the PAYG instalments system or choose to make voluntary payments to avoid a surprise bill at tax time.
Do You Need An ABN To Claim Business Deductions?
No - you claim allowable deductions if you are carrying on a business and the expenses are incurred in earning your assessable income. An ABN doesn’t create deduction rights in itself, but it is a practical indicator that you’re trading and helps you invoice correctly and meet other obligations.
Common Deductions For Sole Traders
Typical deductible expenses include:
- Tools and equipment (e.g. laptops, phones, trade tools)
- Portion of home office, internet and phone (to the extent used for business)
- Vehicle and travel costs used for business purposes
- Marketing and website costs, software subscriptions and domain fees
- Professional development and memberships
- Business insurance premiums
- Interest on business loans or overdrafts
Keep receipts and good records - accurate documentation underpins your claims and makes compliance easier if the ATO asks questions.
What About GST?
If your GST turnover reaches $75,000 or more in a financial year, you must register for GST and begin charging 10% GST on taxable supplies, lodging BAS and claiming input tax credits where eligible. If you’re below the threshold, GST registration is optional.
Important Note On Tax Advice
Tax outcomes depend on your personal circumstances and can change as you grow. It’s a good idea to speak with a registered tax agent or accountant about your business setup, GST, deductions and cash flow planning, especially if you have ABN income alongside a salary.
Step-By-Step: Set Up As A Sole Trader
Ready to get started? Here’s a simple, practical sequence to follow.
1) Map Out Your Offering And Plan
Clarify what you’ll sell, who you’ll serve, and how you’ll deliver. A short business plan covering your services, pricing, audience, costs and goals will help you make confident decisions and is handy when speaking with advisers.
2) Apply For Your ABN
Complete the ABN application online. It’s free and usually quick if your details are in order.
3) Decide On Your Trading Name
If you want to trade under a name that’s not your personal name, register your business name. Check that it’s available and not confusingly similar to an existing brand.
4) Set Up Your Finances
Open a separate bank account to make record‑keeping easier (even though it’s not legally required for sole traders). Choose bookkeeping software and set aside time each week to reconcile transactions.
5) Put Core Legal Documents In Place
Before you start taking on clients, prepare the contracts and policies you’ll rely on (more on the essentials below). Clear terms reduce disputes and support consistent cash flow.
6) Check Licensing, Insurance And Safety
Depending on your industry, you may need specific licences or permits. Think about appropriate insurances for your work (for example, public liability or professional indemnity) and any safety obligations before you begin trading.
Legal Compliance And Essential Documents
Even as a one‑person business, there are laws you’ll need to follow and documents that can protect you from day one.
Core Legal Obligations For Sole Traders
- Australian Consumer Law (ACL): If you’re selling goods or services, you must comply with the ACL - including consumer guarantees, fair refund practices and avoiding misleading or deceptive conduct in your marketing.
- Privacy And Data: The Privacy Act and Australian Privacy Principles (APPs) generally apply to larger businesses (over $3m turnover) and certain small business categories (for example, health service providers). Even if you’re not strictly bound, many sole traders adopt a Privacy Policy as best practice and to meet customer and platform expectations when collecting personal information.
- Tax And GST: Keep accurate records, register for GST when required, and lodge returns and BAS on time. Your accountant can help you set up a process that suits your cash flow.
- Employment And Contractors: If you engage staff or contractors, ensure you’re using the right agreements, paying correctly and following workplace safety laws.
- Intellectual Property: Don’t use others’ IP without permission, and consider protecting your own brand and content (e.g. a trade mark for your name or logo).
Essential Documents For Sole Traders
- Client Service Agreement or Terms & Conditions: Sets out scope, deliverables, fees, payment timing, changes, cancellations, IP ownership and liability limits. Many sole traders rely on a tailored Service Agreement as their core contract.
- Privacy Policy: Explains how you collect, use and store personal information and your approach to requests or complaints. A public‑facing policy builds trust and supports compliance when you collect customer data online.
- Invoices With Your ABN: Include your ABN, payment terms and late fee policy (if any) so clients know exactly how and when to pay.
- Website or Platform Terms: If you sell or book services online, terms clarify acceptable use, IP ownership and disclaimers relevant to your site or app.
- Non‑Disclosure Agreement (NDA): Useful when discussing confidential ideas, pricing or client data with collaborators or contractors.
- IP And Brand Protection: If brand recognition matters to your model, explore trade mark registration to secure your name or logo: register your trade mark.
If your work has industry‑specific risks (for example, regulated professions, health services or activities with physical risk), additional waivers or specialist terms may be appropriate. We can help you tailor the right suite for your business and risk profile.
Key Takeaways
- An ABN signals that you’re carrying on a business, improves credibility with clients and suppliers, and helps you invoice without default tax withholding.
- There’s no “ABN threshold,” but you must register for GST once your GST turnover reaches $75,000 per year (you need an ABN to register for GST).
- You don’t need an ABN to claim allowable deductions - what matters is that you’re carrying on a business and the expense relates to earning your income.
- Strong foundations matter: register your business name if you’ll trade under a brand, keep clean records, and put clear contracts and a Privacy Policy in place.
- Comply with the ACL, consider privacy obligations, manage tax on time and protect your IP as you grow.
- For personalised tax advice (including GST and deductions), speak with a registered tax agent or accountant; for legal setup and protection, our team can help.
If you’d like a consultation on setting up your business as a sole trader under an ABN, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no‑obligations chat.
