The four main business structures in Australia are sole trader, partnership, company and trust. Each is taxed differently, offers different asset protection, and carries different setup and compliance costs. Most established business owners earning $500,000 or more use a combination, typically a trading company owned by a family trust with a bucket company, to legally lower tax and protect assets. The structure you choose matters just as much when buying a business in Australia as when starting one.
Choosing the right business structure is one of the most consequential decisions an Australian business owner makes, and one of the hardest to undo. The structure you operate under determines how much tax you pay, how your assets are protected if something goes wrong, who can share in the income, and what happens when you eventually want to sell or pass the business on. Mina Baselyous (CPA and Chartered Tax Advisor) has reviewed hundreds of structures for Melbourne business owners, and Pinnacle Accounting & Advisory holds 81 five-star Google reviews from owners who have restructured the right way.
Most business owners make this decision once, at the start, and never revisit it. But the structure that made sense when you were a sole trader turning over $150,000 is rarely the right structure when you are running a company with $2 million in revenue and real assets to protect. This is the pillar guide to business structures in Australia: the four main options, how they compare, how multi-entity structures work, and what the right structure actually looks like for an established owner who wants to pay less tax and protect what they have built. It links out to every detailed guide in the series so you can go deeper on each topic.
The Four Main Business Structures in Australia
The Australian Taxation Office recognises four primary business structures: sole trader, partnership, company and trust. Each has different tax treatment, liability exposure, setup costs and operational requirements. Here is what every business owner needs to understand about each one.
1. Sole Trader
A sole trader is the simplest and most common structure for small businesses in Australia. You operate under your own name (or a registered business name), you are personally responsible for all debts and liabilities, and all business income is treated as your personal income and taxed at your marginal rate.
The main advantage of the sole trader structure is simplicity: low setup costs, minimal compliance, and straightforward tax lodgement. The major disadvantage is unlimited personal liability. If the business is sued or cannot pay its debts, your personal assets, including your home, your savings and your car, are at risk. There is no separation between the business and the person.
From a tax perspective, sole traders pay income tax on every dollar of business profit at their marginal rate, up to 47% including the Medicare levy for the 2025-26 year. There is no ability to split income with a spouse or family member, no company tax rate of 25%, and no access to the family trust income distribution strategies that can significantly reduce your tax bill. The sole trader structure works well at low income levels, but as revenue grows it becomes increasingly expensive from a tax standpoint. When the numbers get large enough, moving from sole trader to a company is often the first restructure we recommend.
The ATO has full guidance on sole trader obligations and registration.
2. Partnership
A partnership exists when two or more people carry on a business together with a view to making profit. Partnerships are governed by a partnership agreement, which should always be in writing, and must lodge a partnership tax return each year, though the partnership itself does not pay tax. Instead, each partner includes their share of the partnership income in their own individual tax return and pays tax at their marginal rate.
Partnerships are common in professional services such as law firms, medical practices and accounting firms, and in family businesses where two spouses work together. Like a sole trader, each partner has unlimited personal liability for the debts of the partnership. This is a significant exposure: if your partner makes a decision that creates a liability, you are personally on the hook for it.
The main tax advantage of a partnership is the ability to split income between partners, which can be effective if one partner earns significantly less than the other. However, income splitting is constrained by what is commercially reasonable given each partner’s contribution to the business.
3. Company
A company is a separate legal entity incorporated under the Corporations Act 2001. It has its own Australian Company Number (ACN), can enter contracts, own property and be sued in its own name. The directors and shareholders of the company are generally protected from personal liability for the company’s debts. This is the limited liability that makes companies attractive for businesses with significant assets or risk exposure.
For tax purposes, a company pays corporate tax on its taxable income. For small businesses that qualify as base rate entities (aggregated turnover under $50 million and no more than 80% passive income), the corporate tax rate is 25% for the 2025-26 year, compared with the standard 30% rate. That is significantly lower than the top marginal rate of 47%, and the difference creates a real incentive to retain earnings inside a company rather than distributing them immediately. We explain the detail in our guide to the company tax rate in Australia.
However, retained earnings in the company are not free money. When profits are eventually distributed to shareholders as dividends, those dividends may attract additional personal income tax, though the franking credit system prevents double taxation by crediting shareholders for the tax already paid at the company level. The key point is that a company structure lets you control when you pay the higher marginal rate, by timing distributions to years when your personal income is lower. If you draw money out of your company incorrectly, Division 7A can treat it as a deemed dividend, so the loan account needs careful management.
Running a company involves more compliance than a sole trader: annual ASIC fees, more detailed financial record-keeping, company tax returns, and obligations around director duties. The way you set up the ownership matters too, so it is worth understanding the different classes of shares a company can issue. For an established business with genuine asset protection needs or significant taxable income, the benefits almost always outweigh the compliance cost.
4. Trust
A trust is a legal arrangement where a trustee holds and manages assets on behalf of beneficiaries. In a business context, the most common type is a discretionary trust, also called a family trust, where the trustee has discretion each year to decide how to distribute the trust’s income among the eligible beneficiaries. Trusts are a large topic in their own right, so we cover them in depth in our companion pillar, the complete guide to trusts in Australia.
This discretion is the core tax advantage of a family trust. Each year the trustee can distribute income to the beneficiaries with the lowest marginal tax rates, such as a spouse, adult children, or a bucket company that pays tax at 25%. Over time this can produce very significant tax savings compared with all income being taxed at the primary business owner’s marginal rate. The trust distribution strategies you use each year, and documenting them before 30 June, are what make the difference.
Trusts also provide a degree of asset protection. Assets held in a trust are generally not available to the personal creditors of the beneficiaries, though this protection has limits and depends on how the trust is structured. One critical point: a trust does not retain earnings at a lower tax rate. All trust income must be distributed each year or it is taxed at 47% in the hands of the trustee. This is why trusts are often paired with a bucket company or a holding company to capture undistributed or surplus income at the company tax rate.
Not sure if your structure is still right for you?
Mina Baselyous (CPA and Chartered Tax Advisor) reviews business structures for Melbourne SMEs and identifies whether a restructure would produce genuine tax savings and better asset protection. Most reviews pay for themselves quickly.
Book a ConsultationComparing Business Structures: A Practical Summary
Every business is different, and the right structure depends on income level, family circumstances, the nature of the business risk, and long-term goals. That said, here is how the four structures compare across the dimensions that matter most to an established small business owner.
| Feature | Sole Trader | Partnership | Company | Trust |
|---|---|---|---|---|
| Tax rate | Marginal rate (up to 47%) | Marginal rate per partner | 25% (base rate entity) | Distributed at beneficiary rates |
| Income splitting | No | Limited | Via dividends only | Yes, full discretion |
| Asset protection | None | None | Limited liability | Moderate (structure-dependent) |
| Setup cost | Minimal | Low to moderate | Moderate | Moderate to high |
| Ongoing compliance | Low | Low to moderate | High | Moderate to high |
| Retain earnings at low rate | No | No | Yes (25%) | Only via bucket company |
| Best suited for | Low-income start-ups | Multi-owner businesses | Asset protection and growth | Family income splitting |
Using Multiple Entities: The Trust and Company Structure
For established business owners, the most powerful structuring approach is rarely a single entity. It is a combination of entities working together. The most common setup for Melbourne and Australian SMEs earning above $300,000 is a family trust with a corporate trustee, paired with a bucket company.
Here is how it works in practice:
- The trading entity earns the business income. This might be the trust itself operating the business, or a separate trading company.
- The family trust receives profits and distributes them each year at the trustee’s discretion. The trustee distributes to whoever in the family unit has the lowest taxable income that year, such as a spouse, adult children, or related entities.
- The bucket company receives any portion of trust income that cannot be distributed tax-effectively to individuals. Because a company pays tax at 25%, the bucket company catches excess income at a much lower rate than the owner’s marginal rate. The retained funds can then be used for investment, future distributions, or reinvestment into the business.
- A holding company or holding trust can sit above the operating entity to hold valuable assets such as property, equipment and goodwill, separate from the trading risk, providing an additional layer of asset protection.
This kind of structure is not a loophole. It is a legal, well-established approach that is explicitly contemplated by Australian tax law. It requires careful setup, and it needs to be reviewed annually to ensure distributions are optimal and that trust distributions are documented correctly. For a business owner with significant taxable income and real assets to protect, the combined tax savings and liability reduction can be substantial, often many times the cost of the structure itself. Getting this right, or restructuring correctly when you outgrow a simpler structure, is one of the most valuable things a proactive accountant can do for you. See our tax planning service for how we approach structuring for established business owners.
Which Business Structure Is Right for You?
There is no universal answer. The right structure depends on a combination of factors specific to your situation. That said, here is how Mina approaches the question with clients.
If you are a sole trader turning over less than $150,000 with low risk and no family members who could benefit from income splitting, staying as a sole trader may be perfectly reasonable. The simplicity and low compliance cost are genuine advantages at this level.
If you are turning over $300,000 to $500,000 as a sole trader, you are almost certainly paying more tax than you need to. A family trust structure, or a company, will typically produce meaningful tax savings that far exceed the annual compliance cost. At this income level a review is not optional, it is essential.
If you are turning over $500,000 or more with a family and real assets, a multi-entity structure is almost always worth the investment. The combination of income splitting, retained earnings at 25%, and asset separation produces compounding benefits that grow as the business grows.
If you run a trades or service business with employee liability exposure, a corporate structure provides protection that a sole trader or partnership cannot. A judgment against your company does not automatically expose your home.
If you are planning to bring in investors or eventually sell, a company structure is generally essential. Investors expect to hold shares, and buyers expect to acquire shares or assets from a structured entity. A sole trader business is very hard to sell in a clean, tax-effective way. For the two most commonly debated options, see our direct company vs trust comparison.
Changing Your Business Structure Without Triggering Tax
You can change your business structure, but doing it the wrong way can trigger capital gains tax and stamp duty. The good news is that specific rollovers exist to defer that tax when the conditions are met, most notably the small business restructure rollover. In our experience, the mistake we see most is owners restructuring reactively after a problem, rather than planning the move in advance.
The small business restructure rollover can let you move assets from one structure to another without an immediate CGT bill, provided there is no change in ultimate economic ownership and the other conditions are satisfied. Personal services income rules can also limit how much income you can shift into a company or trust, so it is worth understanding whether your income is caught by the personal services income rules before you restructure. Timing matters: reviewing the structure before a major transaction, such as buying property, bringing in a partner, or selling, produces far better outcomes than cleaning up a messy structure later.
One change on the horizon is directly relevant to trust-based structures. In the 2026-27 Federal Budget, announced on 12 May 2026, the Government proposed a 30% minimum tax on the taxable income of discretionary trusts from 1 July 2028, paired with a time-limited three-year restructure rollover to move assets out of discretionary trusts. This measure is not yet law, and fixed trusts, complying super funds, charitable trusts and deceased estates are proposed to be excluded, but it is a reason for every trust-based business to have its structure reviewed now rather than later. You can read the ATO summary of the proposed minimum tax on discretionary trusts.
Common Mistakes When Choosing a Business Structure
These are the mistakes Mina sees most often when reviewing the structures of new clients who have come to Pinnacle after years with a reactive accountant.
- Never reviewing the structure as income grows. The most common mistake. A sole trader at $80,000 might still be a sole trader at $800,000 simply because nobody asked the question, paying tax at 47% on income that could be taxed at 25% in a company, or distributed to family members at much lower rates.
- Setting up a company without proper advice on how to use it. A company is not just a tax rate. It is a legal entity with its own rules around director duties, dividend payments, loan accounts and Division 7A. Owners who set up a company without understanding these rules can end up with unexpected tax on director loans.
- Using the wrong trustee. A family trust should almost always have a corporate trustee rather than an individual. A corporate trustee provides continuity, better liability protection, and cleaner separation between the trust and its controller.
- Not documenting trust resolutions. A family trust distribution must be documented in a trustee resolution before 30 June each year. Failing to do this can result in undistributed income being taxed at 47% in the hands of the trustee, or ATO audit risk.
- Ignoring Division 7A when running a company. If you take money out of your company for personal use and it is not structured correctly as a salary, dividend, or complying loan, Division 7A can treat the amount as a taxable dividend. This is one of the most common and costly mistakes made by owners operating through companies.
- Not reviewing the structure before a major transaction. Buying property, bringing in a business partner, or selling a business interest can have very different tax outcomes depending on which entity owns the asset. Reviewing the structure before the transaction, not after, is essential.
Explore the Business Structures Series
This guide is the hub for our business structuring content. Use these detailed guides to go deeper on the topic that matters most to you right now:
- Company vs trust: which structure is right for you
- Sole trader to company: when to make the switch
- Small business restructure rollover: change structure without triggering tax
- Trusts in Australia: the complete guide
- What is a holding company and do you need one
- Classes of shares explained
- Company tax rate in Australia: 25% or 30%
- Personal services income and what it means for your structure
- How to start a business in Australia
- How to get an ABN in Australia
For business owners focused on using their structure to actively build long-term wealth, not just reduce tax in the short term, our business structuring services page explains how we approach this for Melbourne business owners.
General Advice Disclaimer
The information in this article is general in nature and does not constitute personal financial, tax, or legal advice. It has been prepared without taking into account your specific objectives, financial situation, or needs. Before acting on this information, you should consider its appropriateness to your circumstances and seek independent advice from a qualified professional. Pinnacle Accounting & Advisory is a registered tax agent. Liability limited by a scheme approved under Professional Standards Legislation.
Frequently Asked Questions
What are the main business structures in Australia?
The four main structures are sole trader, partnership, company and trust. Each differs in tax treatment, asset protection, cost and complexity. Many established businesses use a combination, such as a trading company owned by a family trust, to balance tax efficiency with protection.
Which business structure is best for tax?
There is no single best structure; it depends on profit levels, risk and goals. Companies cap tax at 25% or 30%, trusts allow flexible distribution of income, and sole traders are simplest but taxed at personal rates up to 47% including Medicare. The right mix is a planning decision.
Can I change my business structure later?
Yes, but changing structures can trigger capital gains tax and stamp duty. The small business restructure rollover may let you defer the tax if the conditions are met. It is far cheaper to get the structure right early, so review it before you grow rather than after.
What structure gives the best asset protection?
Generally a company, or a trust with a corporate trustee, provides the strongest asset protection by separating business risk from personal and family assets. A sole trader has none, because you are personally liable for all the debts and obligations of the business.
When should a sole trader switch to a company or trust?
As a rule of thumb, once you consistently turn over more than about $300,000 as a sole trader, the tax and asset protection benefits of a company or family trust usually outweigh the extra compliance. The right trigger depends on profit, risk and family circumstances, so a structure review is worthwhile.
How does the proposed 30% trust tax affect my structure?
In the 2026-27 Federal Budget the Government proposed a 30% minimum tax on discretionary trust income from 1 July 2028, with a three-year restructure rollover. It is not yet law and fixed trusts, super funds and charities are proposed to be excluded. Trust-based businesses should have their structure reviewed now.
If part of your structuring decision involves property, read our guide to buying an investment property in a trust, which covers asset protection, land tax and the 2026 Budget changes.
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