How Long Can a Sole Trader Work for One Company? Legal Guidelines

Going out on your own as a sole trader is a popular path in Australia. You get control, flexibility and a simple setup. It’s also common to find one main client that keeps you busy for months or even years.

So, how long can a sole trader work for one company before it becomes a legal problem? The short answer: there’s no fixed time limit. The longer answer: the longer and more exclusive your arrangement, the more you should check that your relationship still looks and operates like genuine contracting – not employment.

In this guide, we’ll explain how Australian law looks at sole trader arrangements with one client, the key risks for both sides, and practical steps to reduce those risks. If you’re relying on a single client or you’re a business engaging a sole trader long-term, this is your checklist for staying compliant and protected.

What Is a Sole Trader – And How Do They Work With Companies?

A sole trader is the simplest business structure in Australia. You run the business as an individual, using your own Australian Business Number (ABN). You keep control of decisions and profits, but you’re also personally responsible for debts and liabilities.

Sole traders commonly provide services to other businesses – from tradies and freelancers to consultants and specialists. Those arrangements are usually set out in a written Contractors Agreement or a Service Agreement that covers scope, pricing, timelines, confidentiality and IP.

If you’re new to operating as a contractor, it’s helpful to understand what working under an ABN involves, including invoicing and business obligations. You can read more about working under an ABN and the practical differences this creates compared to being an employee.

How Long Can a Sole Trader Work for One Company?

There’s no Australian law that sets a maximum time a sole trader can provide services to a single company. You can, in principle, work with the same client for an extended period – even years.

However, the longer and more exclusive the relationship, the more carefully you should ensure the arrangement remains a genuine contractor relationship. If, over time, the way the work is controlled and delivered starts to resemble employment, regulators or courts may treat it as employment despite the “contractor” label.

Why does this matter? If a contractor is actually an employee at law, the engaging business could be responsible for employee entitlements and compliance (for example, minimum wages under awards, superannuation, and leave), and the contractor may gain rights they didn’t previously have. Getting this wrong can be costly for both sides, which is why structure and conduct matter more than duration alone.

Contractor vs Employee: How Does the Law Decide Today?

Australian courts look first to the written contract governing the relationship. If that contract accurately reflects the working arrangement and is not a sham, its terms carry significant weight in assessing whether someone is an employee or a genuine contractor. How the parties actually behave still matters – for example, if the contract says you can work independently but in practice you’re tightly managed like staff, that inconsistency can count against you.

In practical terms, decision-makers consider a range of indicators. No single factor decides the outcome; it’s the overall picture that counts. Common indicators include:

• Control and direction: Do you decide how, where and when you work, or are you directed like an employee?
• Ability to delegate: Can you subcontract or engage others to help, or must you personally do the work?
• Tools and equipment: Do you provide your own equipment and software, or does the business supply everything?
• Risk and reward: Do you price your work, carry commercial risk (e.g. rework at your cost), and make a profit or loss?
• How you’re paid: Are you invoicing per job or milestone, or receiving wage-like periodic payments?
• Presentation to the market: Do you operate with your own brand and website, and hold yourself out to multiple clients?
• Integration: Are you integrated into the business (e.g. on staff directories, subject to internal HR rules) or clearly separate?

Exclusivity alone doesn’t transform a contractor into an employee, but long-term, exclusive engagements can push the overall picture toward employment if other indicators line up the same way. It’s wise to review your contract and day-to-day practices regularly to make sure they align with the relationship you intend.

Risks When a Sole Trader Works for One Company Long-Term

Working with one primary client can be convenient, but it carries risks for both the sole trader and the company.

Risks for Sole Traders

• Reclassification risk: If your arrangement is found to be employment in substance, you may gain employee rights – but this often follows a dispute. The business may also seek to change the arrangement moving forward.
• Loss of independence: Relying on one client can reduce your bargaining power, limit growth opportunities, and affect cash flow if the client’s needs change.
• Business continuity risk: If the client restructures or brings the work in-house, your income can drop suddenly.
• Tax and compliance complexity: Contracting has different tax and reporting obligations to employment. Your obligations will depend on your setup and activities, so it’s sensible to get tailored tax advice.

Risks for Companies

• Employment obligations: If a contractor is deemed an employee, the business may be responsible for employee entitlements (for example, award rates, superannuation and leave) and could face penalties for non-compliance.
• Workplace safety and conduct: Even for contractors, businesses often carry work health and safety responsibilities and must manage workplace conduct standards.
• IP and confidentiality gaps: Without clear contract terms, the business may not own the work product or adequately protect confidential information and customer data.
• Operational dependency: Relying on a single contractor for critical functions can create continuity and knowledge risks if the relationship ends unexpectedly.

The takeaway: the label “contractor” won’t save an arrangement that operates like employment. Your contract needs to be fit-for-purpose, and your day-to-day practices should match it.

Practical Ways To Reduce Legal Risk

1) Get the Contract Right (And Keep It Current)

Use a written agreement tailored for independent contractors – not a repurposed employment template. A solid Contractors Agreement or Service Agreement should set out independence, deliverables, pricing and invoicing, IP ownership, confidentiality, insurance, termination and dispute resolution. Update it as the engagement evolves.

2) Operate Like a Business, Not Like Staff

• Price your work via quotes, milestones or hourly/daily rates, and invoice with clear payment terms. If you need a starting point, review common invoice payment terms.
• Use your own tools, email domain and branding, and keep a public presence (e.g. website and business profiles).
• Retain the contractual right to delegate or subcontract where appropriate, and exercise it if the project allows.
• Set your own hours and methods, subject to outcome-based deadlines, and avoid wage-like rostering.

3) Avoid Complete Exclusivity Where You Can

It’s fine to have a primary client, but taking on even small additional clients supports your independence. If exclusivity is needed for commercial reasons, make sure the contract expressly addresses independence and the nature of deliverables.

4) Clarify IP, Confidentiality and Data Handling

Spell out who owns deliverables and background IP, and include strong confidentiality obligations. If you collect or handle personal information, you’ll likely need a clear Privacy Policy and suitable data protection clauses – sometimes contractually required by your client even if you’re a small business.

5) Align Your Internal Processes

Keep records of quotes, invoices, and work product. Maintain appropriate insurances. Use your own policies (e.g. information security) so you’re not relying on the client’s internal HR rules or IT controls.

Do You Need Written Contracts – And What Should They Cover?

Yes – written contracts are essential. They don’t just set expectations; they also evidence the independent nature of the relationship. At minimum, your contractor documents should cover:

• Scope and deliverables: What you will deliver, when, and to what standard.
• Fees and invoicing: Rates, milestones, expenses, payment terms and late fees.
• IP ownership: Who owns the work product and background IP, and licence terms where needed.
• Confidentiality: Clear obligations to protect the client’s information (and yours).
• Liability and insurance: Reasonable limitations, indemnities where appropriate, and required insurance cover.
• Subcontracting/delegation: Your right to engage help, subject to quality and security controls.
• Termination and disputes: How either party can end the arrangement and how disputes will be resolved.

Depending on the engagement, you may also use a Non-Disclosure Agreement before sharing proposals or sensitive information, and a Sub-Contractor Agreement if you engage others to help you deliver the work. If your services are sold on a recurring or packaged basis, consider customer-facing Terms of Trade or online Website Terms and Conditions.

Other Compliance Essentials for Sole Traders Working With One Company

ABN and Business Identity

You’ll need an ABN to operate and invoice. Present your work as a business – use your business name and branding, and include your ABN on invoices. If you’re weighing up the pros and cons, explore the advantages and disadvantages of having an ABN and what it means for your operations.

GST and Tax

If your annual GST turnover is $75,000 or more, you must register for GST and charge it where applicable. Your tax position will depend on your circumstances, so it’s a good idea to speak with an accountant about income tax, BAS, and any PAYG obligations relevant to your setup.

Note: tax requirements vary and can be complex. This article provides general legal information only – for tax specifics, get professional tax advice tailored to your situation.

Superannuation and Workplace Laws

If a contractor is later found to be an employee, the business may be liable for superannuation and other employment obligations for past periods, along with penalties. These liabilities can be significant, especially over longer engagements. Building the right structure from the outset is much safer than trying to fix it later.

Insurance

Consider public liability insurance and professional indemnity insurance relevant to your services. Many clients require contractors to hold specific insurance limits as a condition of engagement, so make sure these are clearly addressed in your contract.

Privacy and Data Protection

Most small businesses with under $3 million annual turnover are exempt from parts of the Privacy Act 1988 (Cth), but there are important exceptions (for example, health service providers, credit reporting activities, or where you contractually agree to comply). Even if an exemption applies, clients may require you to meet certain privacy standards and have a Privacy Policy. Align your data handling with what your contracts promise.

Intellectual Property and Branding

If you’re building a recognisable brand, consider registering your trade mark to protect your name or logo. Registering a trade mark can prevent others from using a confusingly similar brand, and it signals professionalism to clients. You can explore options to register your trade mark and how it fits with your broader IP strategy.

Payment Terms and Credit Control

Set clear payment terms from day one to reduce cash flow stress. Confirm due dates, late fees and the process for variations or extra work. If you extend credit, consider Credit Application Terms to manage risk.

Online Presence and Terms

If clients engage you through your website, include user-facing terms and a privacy notice that match how you actually operate. For most service businesses, having up-to-date Website Terms and Conditions and a Privacy Policy is recommended, and sometimes contractually required by enterprise clients.

Should You Switch From Sole Trader to a Company?

If you’ve become the go-to contractor for one (or several) large clients, moving to a company can offer limited liability, a more “enterprise-ready” profile, and flexibility as you grow. It’s not mandatory, but it’s a common step as you scale or take on bigger contracts.

Setting up a company involves registering with ASIC, adopting a constitution and director governance, and managing separate company finances and compliance. If you’re considering this move, you can get support with a full Company Set Up so your structure, documents and records are correct from day one.

If you do incorporate, remember to refresh your contracts so your company becomes the contracting party (not you personally), and update your insurance, website and invoices accordingly.

Key Takeaways

• There’s no legal time limit on how long a sole trader can work for one company in Australia – the real question is whether the relationship remains a genuine contractor arrangement.
• Courts place strong weight on the written contract and whether day-to-day conduct aligns with it. Long-term exclusivity can add risk if other indicators point toward employment.
• Reduce risk by using tailored contractor documents, operating like a business (not staff), avoiding complete exclusivity where possible, and aligning processes with your contract.
• Protect the fundamentals: clear scope and payment terms, IP ownership, confidentiality, insurance, privacy and data handling, and compliant invoicing.
• If you’re scaling or taking on larger clients, consider whether a company structure is right for you and refresh your agreements accordingly.
• Tax and employment obligations can be complex and fact-specific. Getting professional advice early is the safest way to avoid costly reclassification, backpay and penalties.

If you’d like a consultation on your sole trader arrangement or you’re a business engaging contractors long-term, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.