Key takeaways
- The structure decides liability, licensing, operating rules and growth before it decides tax, so those questions should be answered first.
- A sole trader is simple to run but carries personal exposure for every business debt and claim, and that exposure is the main reason to think carefully.
- A company separates the business from the owner in many cases, but personal guarantees and director duties can bring personal exposure back in.
- The licence has to fit the structure, and the person who holds the licence should be confirmed in writing before contracts are signed.
- The usual move from a sole trader to a company is triggered by growth, and it should be planned as a project with an accountant and a solicitor, not made in the middle of a large contract.
Most builders who ask whether they should be a sole trader or a company are really asking which one will cost less at tax time. That is a fair question, but it is the wrong place to start. The structure decides who is liable when a job goes wrong, who holds the licence, how the business can grow, who signs the bank facilities and what the owner has to keep track of every year. Tax is one input among several, and on a building job it is often not the input that causes the most trouble.
The choice matters most when the business is small and the owner is also the licence holder, because the two roles are tangled together from the first day. A sole trader is the same legal person as the licence holder, so the business and the individual cannot be separated. A company is a separate legal person, but it does not remove the owner’s own obligations, and a director who thinks the company protects them from everything tends to find out otherwise at the worst moment.
This article works through the decision as a set of practical questions rather than a tax calculation. It covers what each structure does well, where each one exposes the owner, how the licence affects the choice, what the record keeping looks like in practice, and when a builder should move from one to the other. It is not financial or legal advice, and the figures and rules change, so the detail should be checked with an accountant and a solicitor before any step is taken.
What the structure decides before the tax does
The structure controls four things that matter more than tax on a day-to-day basis. It controls liability: who answers for a debt, a claim or a defect when the money or the legal exposure runs out. It controls the licence: which person or entity holds the licence that allows the work to be done, and who must hold it. It controls the operating rules: how the business is registered, what it must report each year, and what records it must keep. And it controls growth: how easily the business can take on staff, borrow money, sign contracts and bring in a new owner later.
Tax follows from those decisions rather than driving them. A structure that looks cheap in the first year can become expensive when a claim arrives, a bank asks for a personal guarantee, or a site supervisor needs to be employed on a formal basis. Start with liability and licensing, then look at tax with an accountant who knows the current settings.
Sole trader and company, side by side
| Sole trader | Company |
|---|---|
| No separate legal person, so the owner is personally liable for business debts | Separate legal person, which limits personal liability in many cases |
| Simple to set up with few annual filings | More formal obligations and annual reporting with the corporate regulator |
| Licence held by the individual who runs the business | Licence arrangements must be confirmed for the company and its people |
| Personal exposure remains even with careful contracts | Personal guarantees and director duties can bring exposure back |
| Easy to start, harder to bring in partners or buyers | Shares can change hands, which makes partners and sales easier |
The sole trader: simple to run, exposed by design
A sole trader is an individual trading under their own name or a business name. There is no separate legal entity, so the individual is personally responsible for everything the business owes. That includes the debts from a bad month, the claims from a job that goes wrong and the cost of a dispute that runs longer than the contract. The attraction is simplicity. There is less to register, fewer annual filings and less to set up before the first invoice goes out.
The exposure is the trade-off. If the business owes more than it can pay, the creditors can reach the owner’s personal assets, not just the money in the business. For a builder carrying a lot of subcontractor payments, materials accounts and a large contract, that exposure is the single most important reason to think carefully. A sole trader who wants some protection will usually need to look at insurance, careful contract terms and a plan for keeping personal and business money apart, rather than relying on the structure alone.
A sole trader also carries the licence personally, and the licence stays with the individual however the business is run. An individual contractor licence is issued to a person, and it is the person who must meet the continuing obligations that go with it. If that person stops working in the business, the licence and the business do not simply move together.
The company: separation with real limits
A company is a separate legal person. The business owes the debts, signs the contracts and holds the assets in its own name, and in many cases the shareholders and directors are not personally liable for the company’s ordinary debts. That separation is the main reason builders form companies, and it is a genuine benefit when the business is carrying real risk.
The limits are where the disappointment comes from. Banks and suppliers commonly ask directors for personal guarantees, which bring the personal exposure back in through the side door. Directors have legal duties to the company, including duties to act honestly and to avoid trading while the company cannot pay its debts, and a breach of those duties can make a director personally liable. A company also has annual obligations that a sole trader does not, including registration and reporting with the corporate regulator, and those costs and deadlines need to be budgeted for.
Read every guarantee before signing it, and ask what it covers and for how long. A builder who signs a personal guarantee to get a materials account has, in practical terms, given back much of the protection the company was meant to provide. Keep that in mind when the bank or the supplier presents the paperwork at the start of a new contract.
The licence comes first, and it decides more than most owners expect
The licence question should be settled before the structure is chosen, not after. The NSW Government’s guidance on general building work licensing sets out who needs a licence to carry out residential building work and what that licence covers. An individual contractor licence is applied for through Service NSW, and the business structure has to fit the licence the work requires, not the other way round.
In practice, many small firms discover that the person who holds the licence is not the person who owns the business, or that a licence holder has left and the business has been trading on a licence that no longer fits its structure. Those problems are much harder to fix once contracts are signed and staff are on the books. Check the licensing rules for the work you do, confirm which person must hold the licence in your structure, and write the answer down.
The licence holder’s own continuing professional development obligation stays with the individual, whatever the structure. The article on CPD obligations for a company licence sets out how that works in practice, and it is worth reading before you decide who will be the nominated individual for a company.
Records: the same discipline for either structure
Whichever structure you choose, the Australian Taxation Office expects business records to be complete, accurate and kept for the required period. The record keeping guidance from the ATO covers the basics: income, expenses, invoices, bank statements and the evidence behind each deduction. Keep the business money in a separate bank account from the personal money, from the first day, and record every transaction against a job or a category as it happens.
A sole trader can get away with less formality in the early years, but the habit of keeping clean records is the one that protects the owner later. A company has more formal requirements, and the director is responsible for making sure they are met. Either way, the cost of a messy set of books is paid in accountant fees, in the time spent reconstructing invoices, and in the stress of an audit or a tax query that could have been answered in an afternoon.
The guide to bookkeeping systems for builders covers the practical tools that most small firms use. Choose a system that the accountant can work with, and keep the job records in the same place as the invoices, so that a question about a job can be answered without a search through the ute.
When a sole trader should move to a company
The usual trigger for moving from a sole trader to a company is growth. Once the business employs staff, takes on subcontractors on regular terms, signs larger contracts or borrows against the business, the personal exposure of a sole trader becomes harder to justify. A company also makes it easier to bring in a partner, a co-owner or a future buyer, because the shares can be transferred without rewriting every contract the business has signed.
Moving is not free. The business has to be transferred, the contracts and the licence need to be checked against the new structure, and the bank and suppliers need to be told. Some suppliers and clients will want new trading terms or new guarantees. Plan the change for a quiet period, not in the middle of a large contract, and use the accountant and a solicitor to work through the transfer step by step.
Going the other way is less common, but it happens when a company is carrying little risk and the owner wants the simplicity of trading personally. Winding up a company has its own costs and obligations, and it should be treated as a project rather than a quick change of mind.
Moving from sole trader to company
- 1Take adviceMeet the accountant and a solicitor, and write down the reasons for the change.
- 2Check the licenceConfirm which person holds the licence in the new structure, and when the change needs to be made.
- 3Review the contractsCheck the contracts, guarantees and supplier terms that will move to the new company.
- 4Separate the moneyOpen a separate business bank account and keep personal and company money apart from the first day.
- 5Tell the people who need to knowInform the bank, suppliers, clients and staff in writing, with the new details and the dates.
Worked example: a builder on the north coast
Consider a builder on the north coast who started as a sole trader, doing renovations and small extensions. After a few years the work grew, and the builder took on a carpenter on a regular wage and two subcontractors on rolling contracts. A large new client asked for a company name on the contract and a personal guarantee on the materials account. The builder was reluctant, because the company had only just been set up and the business still ran from the same bank account as the family.
The builder took advice before signing. The accountant showed how the business income and expenses would be split between the company and the personal tax position, and a solicitor reviewed the guarantee and found that it could be limited to a set amount and a set period. The builder moved the business into the company, opened a separate bank account for it, and kept the licence with the person who had built the business, with the company contracts written around that position.
The lesson was not that a company is always better. It was that the structure, the licence, the bank account and the guarantee had to be decided together, and that the decision was made before the contract was signed rather than after a dispute began.
The mistake that costs the most
Lead in. The most expensive mistake is to believe the structure is a shield without changing how the business is run. A company with shared bank accounts, unrecorded cash and personal guarantees on every supplier account offers far less protection than its name suggests, and a sole trader with clean accounts and good contracts is often better protected than a company that is run carelessly.
Questions to put to your accountant and solicitor
The decision is easier when you bring the right questions to the meeting. Write them down, take the answers away, and check each one against the licensing rules for your work before you act. The questions below cover the areas that most often go wrong for small builders.
- Which person must hold the licence in this structure, and what happens if they leave?
- What personal guarantees will the bank and the main suppliers ask me to sign?
- What happens to my personal assets if a large claim goes beyond the business?
- What annual filings and reporting does the structure require, and what do they cost?
- How will the business income be taxed in this structure, and when can I change it?
- What records must be kept, and for how long?
Ask for the answers in writing, and keep them with the business records. A structure chosen on a verbal assurance is a structure nobody can check later, and the accountant and solicitor will both expect to be asked the same questions again when the business changes.
Where the structure fits in the wider business
The structure is one of the foundations of a building business, and it sits alongside the licence, the records and the compliance obligations that every licence holder carries. Get the structure right and the rest of the business has something solid to stand on. Get it wrong and every later decision, from hiring a supervisor to signing a large contract, becomes harder than it needs to be.
For the wider picture of how a licence holder keeps up with their obligations, the PointCPD guide to NSW builder CPD sets out the requirement in plain terms, and the separate article on running CPD across several licence holders covers the admin side once the firm has more than one licensed person.
Tax settings change from one budget to the next, and the rules for each structure can change with them. Treat this article as a way of framing the decision, and check the current position with your accountant before you move, change or set up any structure.
Questions builders ask
Is a company always better than a sole trader for a builder?
No. A company separates the business from the owner in many cases, but it has more formal obligations and the protection can be weakened by personal guarantees and careless running of the business. The right structure depends on the risk, the licence and how the business is expected to grow.
Does forming a company protect me from every debt the business owes?
Not in every case. Banks and suppliers often ask directors for personal guarantees, and directors have legal duties that can make them personally liable in some situations. Read every guarantee before signing and take advice on what it covers.
Who needs to hold the builder licence if I form a company?
The licensing requirements depend on the work and the structure, so check the NSW Government guidance on general building work licensing and confirm which person must hold the licence. Write the answer down before contracts are signed, because a mismatch is much harder to fix later.
Does the licence holder still have CPD obligations if the business is a company?
Yes. CPD obligations attach to the individual licence holders, not to the company itself, so the people who hold the licences still need to meet the requirement for their own licences. The company does not do the learning for them.
What records does the tax office expect a builder to keep?
The Australian Taxation Office expects complete and accurate business records, including income, expenses, invoices, bank statements and the evidence for each deduction. Keep business money in a separate bank account from the start, and record each transaction against a job or category as it happens.
When should a sole trader consider moving to a company?
The usual triggers are taking on staff, signing larger contracts, borrowing against the business or bringing in a partner or future buyer. Plan the change with an accountant and a solicitor, and check the contracts, licence and bank arrangements before the transfer.
Sources
- General building work licensing · NSW Government · 2026-09-03
- Continuing professional development for builders and swimming pool builders · NSW Government
- Home Building Act 1989 (NSW) · NSW Legislation
Published 12 October 2026. General information for builders, not legal, financial or engineering advice for a specific job. Check current requirements with the relevant regulator or standard before relying on them.
