A sole trader is a person who runs a business as an individual, without separating their personal and business identity in the eyes of the law. It's the most common business structure in Australia, used by tradespeople, freelancers, consultants, and small business owners across every industry. Setting one up takes less than an hour. But the simplicity at the start can mask some serious consequences down the track if you don't understand what you've agreed to.
How sole trader registration works in Australia
To operate as a sole trader in Australia, you need an Australian Business Number (ABN). You apply for one through the Australian Business Register, and in most cases registration is approved within minutes. There's no fee. If you plan to trade under a name other than your own, you also need to register a business name with the Australian Securities and Investments Commission (ASIC), which costs around $44 for one year or $102 for three years as of 2026.
That's essentially it for setup. No company constitution, no shareholders, no board meetings. You can start invoicing customers the same day you receive your ABN. This low barrier to entry is exactly why sole trading is so popular, particularly among people testing a business idea before committing to a more formal structure.
What unlimited liability actually means
Here's the part that catches people out. As a sole trader, you and your business are the same legal entity. There's no corporate veil between your personal assets and your business debts. If the business owes money, creditors can come after your personal savings, your car, and in the worst cases your home.
This is called unlimited liability, and it's the defining risk of the sole trader structure. A registered company, by contrast, limits shareholders' liability to their investment in the company. A sole trader has no such protection. If a client sues you for a failed project and wins a judgment larger than your business bank account, your personal finances absorb the difference.
Professional indemnity insurance and public liability insurance don't eliminate this risk, but they do contain it significantly. Most sole traders operating in professional services or trades should treat those policies as non-negotiable costs, not optional extras.
Tax obligations for sole traders
A sole trader reports business income as personal income. The money flows through to your individual tax return, and you pay income tax at the same marginal rates as a regular employee. In 2026, that means you pay nothing on the first $18,200, 19 cents per dollar from $18,201 to $45,000, and rising from there.
The big difference from employment is that no one withholds tax on your behalf. You're responsible for setting aside money throughout the year and paying it yourself. The Australian Taxation Office (ATO) requires most sole traders to pay PAYG (Pay As You Go) instalments quarterly once your income reaches a certain threshold. Missing those payments leads to a large, unwelcome tax bill in July.
You can claim legitimate business expenses as deductions: tools and equipment, a home office portion, vehicle use, professional subscriptions, and software. Keeping clean records matters here. A shoebox of receipts won't serve you well at tax time, and the ATO audits sole traders regularly. Understanding your profit and loss position each month makes the annual return far less stressful.
GST: when you need it and when you don't
A sole trader only needs to register for GST if their annual turnover is $75,000 or more. Below that threshold, registration is optional. Many new sole traders choose not to register until they hit the threshold, since adding 10 per cent GST to invoices can make you less competitive when your clients are individuals rather than businesses.
Once you cross $75,000 in turnover, registration is mandatory. You then collect GST from customers, report it to the ATO quarterly through a Business Activity Statement (BAS), and remit the balance after claiming any GST credits on your own purchases. It adds an administrative layer, but it also means you can claim back the GST you pay on business expenses.
Sole trader vs company: when to make the switch
The sole trader structure works well when you're starting out, your income is modest, your risk exposure is low, and simplicity matters. A company structure becomes worth considering when income grows above roughly $120,000 to $150,000 (where the flat 25 per cent company tax rate starts to look attractive compared to personal marginal rates), when liability risk is significant, or when you want to bring in co-owners or investors.
Setting up a company costs more, involves more ongoing compliance, and requires separate accounts and annual ASIC filings. For many sole traders, the switch makes sense eventually. The right time depends on your specific revenue, industry, and risk profile, and an accountant can model the tax difference for your situation in a single meeting. A solid business plan can help you decide which structure fits your ambitions before you've committed to either.
Superannuation for sole traders
This is the gap most sole traders only notice years later. Unlike employees, sole traders have no employer making compulsory superannuation contributions on their behalf. The responsibility falls entirely on the individual. The ATO doesn't chase you for it. Nothing happens if you skip it year after year, except that you reach retirement age with less money than you'll need.
The voluntary contribution limit for concessional (pre-tax) super is $30,000 per year in 2026. Contributing to super as a sole trader is tax-deductible, which makes it one of the more efficient ways to reduce taxable income while building long-term savings. It's a lever worth pulling, particularly in higher-income years.
The honest case for sole trading
For millions of Australians, the sole trader structure is exactly right. It keeps administration light, costs minimal, and gets you earning quickly. A photographer, a garden designer, a bookkeeper, a web developer running their own practice: each of them can operate cleanly and profitably as a sole trader for years without the overhead of a company.
The key is going in with clear eyes. Unlimited liability is real. Tax obligations don't manage themselves. Super doesn't accumulate without deliberate action. None of these are reasons to avoid the structure. They're reasons to understand it before you register.
The ABR website has registration open every day of the year. Most people are a sole trader within the hour. The paperwork is the easy part.