The Structure Decision Most Owners Make Once and Never Revisit
Most business owners choose their legal structure at the beginning — when they were smallest, least experienced, and had the least at stake. That early decision is often made quickly, on the advice of whoever helped set up the business, without a full understanding of its tax, liability, and exit implications.
And then it’s rarely revisited.
The problem is that the optimal structure for a sole trader testing a new service is not the optimal structure for a profitable, growing business with employees, assets, and exit aspirations. As the business evolves, the structure that made sense at launch can become a liability — in tax exposure, personal risk, and transferability.
This post gives you a clear, practical overview of the four main business structures in Australia — their tax and profit implications, their risk profiles, and the circumstances in which each is most appropriate. It’s not a substitute for professional advice. It’s the foundation for a better-informed conversation with your accountant.
The Four Structures and Their Profit Profiles
Sole Trader
The simplest structure to establish, and the most personally exposed. All business income flows directly to the owner and is taxed at their personal marginal rate — which, for a profitable business, can reach 47% including Medicare levy in Australia. There is no separation between business and personal liability.
|
Dimension |
Sole Trader Profile |
|
Tax treatment |
All profit taxed at personal marginal rate (up to 47% AUS) |
|
Liability |
Unlimited — personal assets fully exposed |
|
Setup cost |
Minimal (ABN registration only) |
|
Administrative burden |
Low |
|
Profit retention |
Poor at higher income levels |
|
Exit saleability |
Limited — business is inseparable from the individual |
|
Best suited for |
Early-stage testing, very low revenue, minimal risk exposure |
Proprietary Limited Company (Pty Ltd)
The most common structure for growing owner-led businesses. A Pty Ltd is a separate legal entity — it pays tax at the corporate rate (currently 25% for base rate entities in Australia, as of the 2024–25 financial year), which is materially lower than the personal marginal rate for profitable businesses. Liability is limited to the company’s assets, subject to director duty obligations.
|
Dimension |
Pty Ltd Profile |
|
Tax treatment |
Company tax rate: 25% (base rate entity) or 30% |
|
Liability |
Limited — directors protected from personal liability (with exceptions) |
|
Setup cost |
$1,200–$1,500 AUD approx. |
|
Administrative burden |
Moderate — ASIC fees, annual tax returns, corporate governance |
|
Profit retention |
Stronger — lower tax rate allows more retained earnings |
|
Exit saleability |
High — shares can be sold, business is separable from owner |
|
Best suited for |
Growth-stage and established businesses with meaningful profit |
Partnership
Two or more people operating a business together. Each partner pays tax on their share of partnership income at their individual marginal rate. Liability is shared — which means each partner can be held responsible for the other’s obligations. A well-drafted partnership agreement is essential and non-negotiable.
|
Dimension |
Partnership Profile |
|
Tax treatment |
Each partner taxed individually on their share of income |
|
Liability |
Shared and potentially unlimited (general partnership) |
|
Setup cost |
Low, but partnership agreement is essential |
|
Administrative burden |
Moderate |
|
Profit retention |
Variable — depends on individual tax positions |
|
Exit saleability |
Complex — requires partner agreement or buyout |
|
Best suited for |
Established professional practices, co-founders with aligned interests |
Discretionary (Family) Trust
A trust structure that allows the trustee to distribute income to beneficiaries at their discretion — typically to family members or associated entities in lower tax brackets. This flexibility is the primary tax planning advantage. Trusts also provide a layer of asset protection, as assets held in a trust are not directly owned by the individual.
|
Dimension |
Discretionary Trust Profile |
|
Tax treatment |
Income distributed to beneficiaries at their marginal rates — allows tax minimisation |
|
Liability |
Assets protected from personal creditors (within limits) |
|
Setup cost |
$1,500–$2,500 AUD for a standard trust deed |
|
Administrative burden |
Higher — separate tax return, trustee obligations, resolution requirements |
|
Profit retention |
Strong when distributions are managed across beneficiaries |
|
Exit saleability |
Complex — requires restructuring for clean business sale |
|
Best suited for |
Established businesses with family income splitting potential, asset-rich operators |
The Profit and Tax Impact: A Practical Comparison
Consider a business generating $300,000 in net profit before owner remuneration. The tax outcome varies dramatically by structure:
|
Structure |
Approximate Tax Treatment on $300K Profit |
|
Sole Trader |
Taxed at personal marginal rate — could result in $120K+ tax bill depending on other income |
|
Pty Ltd |
Company tax at 25% = $75,000 — remainder can be retained or distributed as dividends (with franking credits) |
|
Partnership (2 equal partners) |
Each partner taxed on $150K — potentially $45K–60K each depending on other income |
|
Discretionary Trust |
Distributed to beneficiaries at their marginal rates — with planning, total tax could be significantly lower than sole trader or equal partnership |
These are illustrative comparisons only. The actual tax outcome depends on your personal circumstances, other income, salary drawn, dividends, and the specifics of your distribution strategy. The critical point is that structure has a material impact on how much of your profit you retain — and the conversation with your accountant about structure is worth having proactively, not reactively.
When to Review Your Structure
Three triggers that should prompt an immediate structure review with your accountant and solicitor:
- Your profit has grown materially. If you’re a sole trader earning above $120,000–$150,000 in net profit, the difference between your current tax rate and a company rate is likely large enough to justify restructuring costs within a single financial year.
- You’re taking on partners or investors. A structure that worked for a solo operator doesn’t protect either party in a multi-owner arrangement. A Pty Ltd with a well-drafted shareholders’ agreement is the minimum appropriate structure.
- You’re thinking about exit. Businesses held in a Pty Ltd are significantly more saleable than those operated as sole traders or trusts. If exit is a 3–5 year horizon, the restructuring should happen now — not when you’re already in a sale conversation.
Self-Audit: Is Your Structure Still Right for Your Business?
- When did you last review your business structure with your accountant? If it was more than 3 years ago, it’s overdue.
- What is your current effective tax rate on business profit? How does it compare to the company tax rate?
- Are your personal assets exposed to business risk under your current structure?
- If you were to sell the business in the next 5 years, is it structured in a way that makes it straightforwardly transferable to a buyer?
- Does your structure allow for income splitting or distribution flexibility that reduces your total tax burden?
