Outgrowing Sole Trader: When to Incorporate

Starting as a sole trader is the right call for most people — it's simple, cheap to set up, and low on compliance. The problem is that a lot of businesses stay a sole trader well past the point where it's still the right structure, either because incorporating feels like a hassle or because nobody flagged that the numbers had changed enough to matter.

Why sole trader structures stop working as businesses grow

Two things change as a sole trader business grows: tax and risk. As a sole trader, all business profit is taxed at the owner's personal marginal rate, which climbs to 37% and then 45% once income passes certain thresholds. There's also no legal separation between business and personal assets — every contract signed, every employee hired, and every liability incurred is attached directly and personally to the owner, with no buffer.

1. Watch the tax gap between personal and company rates

Companies pay a flat rate of 25% or 30% depending on turnover, well below the top personal marginal rate. Once consistent profit moves into the range where a meaningful chunk is being taxed at 37% or 45% personally — often somewhere around $120,000-$150,000 in profit, though this varies by individual circumstances — the tax saved by incorporating can start to outweigh the extra compliance cost of running a company.

2. Consider what's actually at risk personally

As a sole trader, a lawsuit, a bad debt, or a contract dispute can expose personal assets — the family home, personal savings, anything held in the owner's name — with no separation from the business. As contract sizes grow, as staff are hired, and as the business takes on more operational risk, that exposure becomes more consequential. A company or trust structure creates a genuine legal barrier between business liabilities and personal wealth.

3. Factor in more than just tax when weighing the switch

Incorporating isn't free — there's ASIC registration, potential capital gains tax on transferring business assets into the new entity, updated contracts and invoicing, and ongoing costs like annual company statements. It's genuinely worth modelling the total cost of switching against the ongoing tax saving and risk reduction, rather than assuming incorporating is automatically the right move at any specific income level.

4. Understand that bookkeeping gets more involved after incorporating

A company needs its own set of accounts, completely separate from the owner's personal finances. Director loan accounts need to be tracked carefully under Division 7A rules to avoid unintended tax consequences, and if the owner is paid a wage rather than drawings, payroll needs to be set up and run properly. This is a meaningfully bigger bookkeeping job than sole trader record-keeping, and it's worth having a Xero file built correctly from the switch date rather than retrofitting it later.

5. Company or trust — get advice specific to your situation

Companies offer a straightforward flat tax rate and are often the simpler choice for growing service businesses. Trusts offer more flexibility in how profit is distributed, which can suit family-run businesses or situations with multiple beneficiaries. Neither is automatically better — this decision depends on the specific business, its risk profile, and the owner's broader financial situation, and it's genuinely worth a proper conversation with an accountant rather than defaulting to whatever a friend or competitor chose.

Signals it's time to have the conversation

• Consistent profit above roughly $120k-$150k — the tax gap starts to matter
• Growing personal asset exposure — a house, savings, or other assets increasingly at risk
• Bigger contracts or clients requiring formal liability terms — some simply won't sign with a sole trader
• Hiring staff — more operational and legal risk sitting with the business
• Planning to bring on a business partner or investor — sole trader structures don't support this

None of these signals alone means incorporating is automatically the right call today — but when two or three line up together, it's worth a proper conversation with an accountant about structure, backed by clean, current financials that show exactly what's at stake either way.