Choosing a Business Structure for Your Australian Startup

A practical comparison: Sole Trader vs Partnership vs Company vs Trust

Current as at FY 2025–26. Figures and thresholds referenced are sourced from the ATO, ASIC, and business.gov.au. This is a general guide and not legal, tax, or financial advice. Always confirm with a registered tax agent, and ideally with a startup-experienced lawyer, before you lock in a structure.

How to use this guide

The "right" structure depends on three things that tend to matter most for startups:

Who is going to own and run it — solo founder, co-founders, spouse, investors?
How you plan to fund it — bootstrapped, friends & family, angels, VC?
What the downside risk looks like — could a customer, supplier, or mistake sue you personally?

There is no universally "best" structure. The answer for a freelance consultant validating an idea is usually different from the answer for two co-founders building a SaaS product they want to raise capital for.

At-a-glance comparison

	Sole Trader	Partnership	Company (Pty Ltd)	Trust (discretionary or unit)
Separate legal entity?	No	No	Yes	The trust itself isn't a legal entity, but the trustee acts on its behalf
Personal liability	Unlimited — your personal assets are on the line	Unlimited and joint — you can be liable for your partner's actions	Limited to what you've paid for your shares (plus director duties)	Depends on trustee; a corporate trustee limits personal exposure
Setup cost	Very low — just an ABN	Low — ABN + partnership agreement	Moderate — ASIC registration fee, constitution, share register	Higher — trust deed + ideally corporate trustee
Setup complexity	Minimal	Low (but get the agreement drafted)	Moderate	High
Tax rate on profit	Your marginal personal rate (up to 45% + Medicare)	Each partner pays their marginal rate on their share	25% (base rate entity) or 30%	Generally taxed in beneficiaries' hands at their marginal rate
Can retain profits at a lower rate?	No	No	Yes — profits sit in the company at 25/30%	Limited — undistributed income is taxed at 47%
Can take in investors (equity)?	No	Clumsy	Yes — shares	Unit trust yes; discretionary trust no
Suitable for ESOP / employee shares?	No	No	Yes, and it gets the startup ESS tax concessions	Not really
Ongoing admin	Minimal	Low	Moderate — annual ASIC review, company tax return	Moderate to high
Ability to split income with family	No	Limited	Via dividends to shareholders	Very flexible (discretionary trust)
Perceived credibility	Lowest	Low	High	Medium

1. Sole Trader

What it is

You are the business. You trade under your own name (or a registered business name), using your personal TFN and a business ABN.

What's good about it

Cheapest and fastest to set up. Get an ABN (free from the Australian Business Register), register a business name with ASIC if you're not trading under your own name, and you're operating.
Simplest tax. Your business income flows straight onto your personal tax return via a business schedule. One return, no separate tax file number.
You keep everything. No constitution, no shareholders, no director duties under the Corporations Act.
Losses are useful. Business losses can offset your other personal income (e.g. a salary from a day job), subject to the non-commercial loss rules.

What's painful about it

Unlimited personal liability. If the business is sued or racks up debt it can't pay, your house, car, and savings are exposed. For anything that could harm a customer or involve contracts of any size, this is a real problem.
Tax ceiling. Every dollar of profit is taxed at your marginal rate. In 2025–26 that's 16% above $18,200, 30% above $45,000, 37% above $135,000, and 45% above $190,000 (plus the 2% Medicare levy). A profitable sole trader can easily pay more tax than the same business run through a company.
No way to retain profits at a lower rate. You can't leave money in the business at a company rate and reinvest it tax-efficiently.
Hard to bring in a co-founder or investor. There's no share structure to give them.
Super is on you. No employer contributions — you need to fund your own super.

Who it usually suits

Solo consultants, freelancers, side-hustlers, and very early-stage founders who are validating an idea and aren't yet doing anything risky. Plenty of successful Australian startups started this way for the first six to twelve months, then restructured.

2. Partnership

What it is

Two or more people (up to 20 for most businesses) carrying on a business together with a view to profit. The partnership has its own TFN and ABN and lodges its own return, but the partnership itself doesn't pay tax — profits flow through to the partners.

What's good about it

Cheap and simple to set up compared with a company or trust.
Profits split at each partner's marginal rate, which can be efficient if partners are on different incomes.
Shared skills, shared capital, shared workload.
Losses flow through to partners and can offset their other income (subject to rules).

What's painful about it

Unlimited joint and several liability. If your co-founder signs a dodgy contract or runs up debt, you can be on the hook — personally — for the full amount, not just your share.
Every partner's actions bind the business. A partner can enter into contracts on behalf of the partnership without the others' approval.
Disputes are brutal without a proper partnership agreement covering profit splits, decision-making, new partners, exits, and dissolution.
Hard to scale or bring in investors. If you want to take angel money or run an ESOP, you'll be restructuring.
No retained profits at a low rate. Same problem as sole trader — it all flows through at personal rates.

Who it usually suits

Professional partnerships (doctors, lawyers, accountants) and small family businesses. For a startup with co-founders, a company is almost always a better choice — even just for two people. A partnership is rarely the right long-term answer for a scalable startup.

3. Company (Proprietary Limited / Pty Ltd)

What it is

A separate legal entity registered with ASIC. It owns its own assets, signs its own contracts, sues and is sued in its own name. Owners hold shares; directors run it. The vast majority of Australian startups are Pty Ltd companies.

What's good about it

Limited liability. Shareholders' exposure is generally capped at what they paid (or promised to pay) for their shares. This is the single biggest reason founders choose a company.
Flat tax rate. Companies pay 25% as a base rate entity (aggregated turnover under $50 million and no more than 80% of income from passive sources like interest, rent, and dividends), otherwise 30%. For a profitable active business, that's usually far below the top personal rate.
You can retain profits in the company and reinvest at the company tax rate, rather than paying them out and getting taxed personally.
Franking credits. When the company eventually pays dividends, shareholders get credit for the tax the company already paid, avoiding double taxation.
Equity raising works. Shares, share classes, SAFE notes, convertible notes, and priced rounds — all of it assumes a company. VCs and most angels will not invest in anything else.
ESOP-friendly. The Employee Share Scheme startup concessions (which can give employees tax-deferred share options) require an unlisted Australian company that is under 10 years old and has under $50M in turnover — pretty much any genuine Australian startup qualifies.
R&D Tax Incentive. Only companies can claim the R&D tax offset, which is a cash refund of up to 43.5% of eligible R&D spend for smaller companies with a tax loss.
Perpetual existence and credibility. The company continues regardless of who owns it, and "Pty Ltd" signals to customers, suppliers, and staff that you're a real business.

What's painful about it

Setup and ongoing costs. ASIC charges a registration fee to incorporate and an annual review fee for each company — check the current ASIC fee schedule for exact figures as they're indexed each July. You'll also want a proper constitution and share register.
Separate tax return. The company lodges its own return, separate from yours. You'll almost certainly need an accountant.
Director duties. As a director, you have legal duties under the Corporations Act (act in good faith, avoid insolvent trading, etc.) with real personal consequences if you breach them.
Director ID is mandatory. All company directors must obtain a Director Identification Number from ABRS before being appointed.
Losses are trapped. Company tax losses stay in the company — you can't use them against your personal salary. They carry forward but have to pass continuity tests.
Division 7A. If you take money out of the company as a loan rather than a salary or a dividend, the ATO can treat it as a deemed unfranked dividend. This catches a lot of first-time founders.
Paying yourself is more structured. Salary (with PAYG withholding and 12% super guarantee in 2025–26), dividends, or director fees — not just drawings.

Who it usually suits

Co-founded startups
Anything you plan to raise capital for
Anything with meaningful liability exposure (software with customer data, physical products, services involving advice)
Anyone who expects to be profitable enough to want to retain earnings

For most Australian tech startups, a Pty Ltd is the default answer.

4. Trust

What it is

A legal arrangement where a trustee holds assets and carries on a business for the benefit of one or more beneficiaries, governed by a trust deed. The trustee can be an individual, but is usually (and ideally) a dedicated Pty Ltd company called a "corporate trustee." Two main flavours matter for business:

Discretionary trust (often called a "family trust"): the trustee decides each year which beneficiaries get what share of the income.
Unit trust: beneficiaries hold fixed "units" — conceptually similar to shares. Often used when unrelated parties want a trust structure.

What's good about it

Asset protection. Assets owned by the trust generally aren't available to a beneficiary's personal creditors (including in bankruptcy or divorce, though this is nuanced and fact-specific).
Flexible income distribution (discretionary trusts). The trustee can distribute to adult beneficiaries on lower marginal rates each year.
50% CGT discount flows through to individual beneficiaries on assets held more than 12 months.
Small business CGT concessions can apply very favourably when the business is sold.
Perpetual-ish existence (up to the vesting date, typically 80 years).

What's painful about it

Most complex and expensive to set up and maintain. You need a trust deed, ideally a corporate trustee (= another company to administer), and an accountant who actually understands trusts.
Undistributed income is taxed at 47%. Discretionary trusts effectively have to distribute profits each year to avoid this penalty rate, which defeats the "retain profits cheaply" advantage a company has.
Can't easily raise capital. Most investors won't invest in a discretionary trust. Unit trusts can take investment, but are still unusual for startups and don't get the ESS startup concessions.
No ESOP concessions. The startup tax concessions for employee share schemes are designed for companies.
Losses are trapped in the trust and can only be used against future trust income (and only if strict loss-recoupment tests are met).
Anti-streaming and Section 100A rules heavily restrict what used to be aggressive distribution strategies. The ATO has been active in this area.
Family trust elections can lock you in and create headaches later.

Who it usually suits

Established family businesses where income splitting with family members is the goal
Investment vehicles holding property or shares
Professional services firms in some cases
Holding structures above an operating company (more on this below)

Straight-up trusts as the operating entity for a scalable, capital-raising startup are rare and usually inadvisable. Where trusts do show up in startup-land is as a holding vehicle for a founder's shares in the operating company.

Startup-specific considerations

If you plan to raise capital

You need a Pty Ltd company. End of story. VCs, angels, accelerators, and convertible note investors all assume they're buying shares in an Australian proprietary limited company. Starting as a sole trader or trust means restructuring later, which is doable but costs money, time, and sometimes CGT.

If you want to issue shares or options to employees

The Employee Share Scheme startup concessions are the most generous in Australian tax law for this — but they're only available to unlisted Australian companies under 10 years old with turnover under $50 million. Get the structure right from day one so you can use them.

If you want to claim the R&D Tax Incentive

Only companies can claim it. For loss-making startups doing genuine R&D, the refundable offset can be a significant source of non-dilutive cash.

The "company owned by a discretionary trust" pattern

A common structure for founders who want both asset protection and flexibility: the founder's shares in the operating Pty Ltd company are held by a discretionary family trust rather than by the founder personally. Dividends from the company flow into the trust, where they can be distributed across family beneficiaries.

Caveats: this adds setup cost and ongoing complexity, some investors don't love it, and the ESS startup concessions are designed for individuals holding shares directly — so employees receiving ESS should usually hold shares in their own names, not via a trust. Talk to a tax adviser before setting this up.

Bucket companies

Another common layer: a separate "bucket" Pty Ltd that receives trust distributions or dividends and retains them at the 25/30% company rate rather than forcing distribution to individuals on higher marginal rates. Again, worth a conversation with an accountant once the business is actually making money.

Key registrations you'll need regardless of structure

ABN (Australian Business Number) — free, from the Australian Business Register
TFN — individual for sole traders/partners; separate entity TFN for companies and trusts
Business name registration with ASIC if you're not trading under your exact legal name (nominal annual fee)
GST registration is mandatory once your GST turnover reaches $75,000 in a 12-month period (current or projected), and you have 21 days to register once you cross the threshold. Ride-sharing and taxi services must register from the first dollar.
PAYG Withholding registration if you're paying employees
Super Guarantee — 12% of ordinary time earnings in 2025–26, paid to employees' super funds
Director ID — every company director needs one, obtained from ABRS
Workers' compensation insurance if you have employees (state-based)

A rough decision framework

Ask yourself, in order:

Could this business realistically be sued, or sign contracts worth more than I can afford to lose? If yes, you want limited liability → company.
Am I going to raise external capital or issue equity to employees? If yes → company, definitely.
Do I expect to be meaningfully profitable and want to reinvest earnings? If yes, the 25% company rate is attractive → company.
Am I just testing an idea with low risk, low revenue, and no co-founders? Sole trader is fine for now — but plan to restructure when it starts working.
Is this a family investment vehicle or an established family business where income-splitting is the main goal? Trust is worth considering.
Do I have a co-founder? Skip partnership. Use a Pty Ltd and a proper shareholders' agreement.

The typical Australian startup pathway

Many founders do this: sole trader → Pty Ltd when the idea is working, there's a co-founder, money is flowing, or investors are circling. Don't let "setting up the perfect structure" delay you from validating the idea in the first place — but don't stay in the wrong structure too long either, because restructuring gets more expensive the bigger you are.

Common mistakes to avoid

Running a genuinely risky business as a sole trader to save a few thousand dollars a year. One bad day and you lose the house.
50/50 partnerships without an agreement. Works beautifully until it doesn't.
Setting up a trust because someone at a BBQ said it was tax-efficient, without understanding that undistributed trust income is taxed at 47%.
Delaying the company setup and then trying to transfer IP and customers into a new entity before a funding round. It's doable but messy and can trigger CGT.
Founders holding shares via their super fund. Usually creates more problems than it solves — avoid without specific advice.
Ignoring Division 7A. Taking money out of the company informally is not the same as paying yourself a wage or dividend. The ATO will notice.
Not getting a shareholders' agreement alongside the company constitution. The constitution covers the company; the shareholders' agreement covers what happens between you and your co-founders.

Next steps

Have a free initial chat with a registered tax agent who regularly works with startups — not a general accountant. Ask specifically about company setup, ESS, and R&D.
Get a startup lawyer to review your company constitution and draft a shareholders' agreement if you have co-founders.
Use the business.gov.au business structure tool and the ATO website as your reference points for the current rules — they're free and authoritative.
Once set up, get accounting software (Xero is the most common in Australia) from day one. Don't retrofit bookkeeping later.

This guide reflects rules and rates for the 2025–26 Australian financial year. Tax law and thresholds change — always verify current figures with the ATO and get professional advice for your specific situation before structuring your business.