Choosing a Business Structure for Residential Builders in Australia

What it is

A business structure is the legal form a residential builder uses to trade. ASIC and the ATO recognise four common structures in Australia: sole trader, partnership, company and trust. The structure decides who owns the business assets, who is liable for debts and warranty claims, what tax rate applies and what reporting the business must lodge.

Most residential builders in Australia start as sole traders because the setup is cheap and the compliance is light. They tend to move to a proprietary limited company (Pty Ltd) or a discretionary trust with a corporate trustee once revenue grows, once they take on staff or subcontractors at scale, or once they want to separate personal assets from build-site liability.

Sole trader

A sole trader uses their own Tax File Number and an Australian Business Number to trade. The builder and the business are the same legal person. Profits are taxed at the builder's marginal rate up to 45 per cent plus the Medicare levy. There is no asset protection. A defects claim or an insolvent build can reach the builder's house, car and savings.

Sole trader works for small renovation operators with low contract values and no employees. It is the cheapest structure to run because there is no ASIC fee and no separate tax return.

Partnership

A partnership splits income between two or more partners using a partnership agreement and a separate partnership TFN. Each partner is jointly and severally liable for the partnership's debts. One partner's mistake can sink the others.

Partnerships are rare in residential construction because the joint liability is dangerous when one partner runs the build and the other handles admin. Builder spouses who want income splitting usually achieve it through a family trust instead.

Proprietary limited company (Pty Ltd)

A Pty Ltd is a separate legal entity registered with ASIC. It has its own ACN, its own tax file number and its own tax return. Company profits are taxed at the base rate of 25 per cent for a base rate entity (most active building businesses qualify) or 30 per cent otherwise.

The company shields the director's personal assets in most cases. Creditors of the company can only chase the company's assets. The shield is not absolute. Directors remain personally liable for unpaid PAYG withholding and superannuation under the Director Penalty Notice regime, for insolvent trading under section 588G of the Corporations Act 2001, and for personal guarantees they sign for materials accounts or finance.

Directors carry duties under sections 180 to 184 of the Corporations Act 2001: care and diligence, good faith, no improper use of position and no improper use of information. ASIC enforces these duties and can ban directors who breach them.

Discretionary trust with corporate trustee

A discretionary trust (often called a family trust) holds the business and distributes profits to beneficiaries each year. The trustee should be a Pty Ltd company, not an individual, so that the corporate veil sits between the trust and the builder personally.

The structure suits established builders because it allows income to be streamed to lower-earning family members each financial year and it adds an extra layer of asset separation. The cost is higher: an annual trust tax return, an annual company tax return for the trustee, ASIC fees and accountant fees that typically run two to three times the cost of a single Pty Ltd.

Trusts must also distribute all income each year or pay tax at the top marginal rate. The trustee resolution must be signed before 30 June for income tax purposes.

How to choose

Builders should weigh four factors with their accountant: expected annual revenue, number of employees and subcontractors, the value of personal assets they want to protect, and whether they want to split income with a spouse or partner.

A sole trader earning under $90,000 a year with no staff usually stays as a sole trader. A builder earning $250,000 a year with three employees and a mortgaged home typically benefits from a Pty Ltd. A builder with a spouse on a lower income, paid-off personal assets and revenue over $500,000 usually benefits from a trust with corporate trustee.

The structure should be reviewed every time the business takes on its first employee, signs a contract over $1 million, buys commercial property or brings in an external investor. Builders in Australia must also check state-based licensing rules: in NSW, Victoria and Queensland the building licence is tied to the nominated supervisor and the entity that holds the contract, so any change in structure requires a licence transfer or a new licence.