Hiring contractors gives Australian small businesses flexibility. However, misinterpreting the rules around payroll tax for contractors can lead to substantial backdated tax liabilities, penalties, and interest.
Many small business owners assume that if someone has an ABN and sends invoices, payroll tax does not apply. Unfortunately, that’s not always the case — each state and territory has its own rules, and contractor payments can still attract payroll tax.
This guide explains how contractor payments are assessed, when they may attract payroll tax and how businesses can reduce compliance risk through structured payroll services.
Why Payroll Tax Contractors Create Compliance Risks for Small Businesses
Payroll tax is administered by state and territory revenue offices, not the ATO. Each state and territory has ‘relevant contract’ provisions that can treat contractor payments as taxable wages.
For example:
Even if a worker is not considered your employee under Fair Work or ATO rules, they may still be treated as a contractor for payroll tax purposes under state legislation.
This is where many small businesses go wrong.
What Is a Relevant Contract Under Payroll Tax Rules?
Under most state and territory laws, a relevant contract payroll tax issue arises in the following circumstances:
- You engage a person to do work for your business.
- The contract is mainly for labour.
- The contractor does work in or for your business.
When a contract is classified as a relevant contract, payments may be treated as wages for payroll tax purposes. As a result, you may be liable for payroll tax on payments to contractors even if:
- They have their own ABN.
- They send you invoices.
- They claim to be subcontractors.
The label does not matter. The substance of the arrangement does.
When Do Payroll Taxes for Independent Contractors Apply?
Payroll taxes for independent contractors arise in situations where the structure appears more like employment than a business service.
Typical indicators:
- Labour-only contracts (minimal equipment and materials used)
- The contractor is primarily working for your business
- Ongoing or rolling contracts
- The contractor is integrated into your operations
- You control how and when the work is completed
In these cases, state revenue authorities may assess the payments as wages, potentially triggering backdated liabilities.
Payroll Tax vs ATO Rules: Why They’re Different
| Area | Regulator | Focus |
| Income tax & PAYG | ATO | Employment indicators |
| Superannuation | ATO | Common law employee test |
| Payroll tax | State Revenue Offices | Relevant contract rules |
| Worker Classification | Fair Work Ombudsman | Employee vs independent contractor distinction |
Contractor for Payroll Tax Purposes: What Businesses Should Check
When determining whether payments to a contractor may be treated as wages for payroll tax purposes, state revenue authorities assess the actual working relationship, not just the contract wording.
They typically review factors such as:
- whether the contract is mainly for labour
- the level of control over how work is performed
- whether the contractor works primarily for one business
- whether the contractor provides equipment or materials
- whether the contractor operates as an independent business
Even when a worker has an ABN and invoices your business, they may still be considered a contractor for payroll tax purposes under state legislation.
Understanding these factors early helps businesses identify potential payroll tax exposure before issues arise.
Payroll Tax on Subcontractors: High-Risk Industries
Certain industries are subject to closer scrutiny regarding payroll tax on subcontractors, including:
- Construction and trade industries
- IT and technology services
- Medical and allied health practices
- Professional services (legal, accounting, and consulting)
- Labour hire businesses
Example:
If a business engages a subcontractor on a full-time basis for 12 months, controls their daily activities, and the subcontractor provides no equipment or materials of their own, the engaging business may be liable for payroll tax on those payments — even if the subcontractor invoices monthly.
Payroll Tax Contractor Exemptions: When Do They Apply?
Exemptions from payroll tax do exist for contractors, but the onus is on you to prove them.
Some common exemptions may apply if the contractor:
- Supplies services to the general public
- Operates for less than 90 days in a financial year
- Employs their own staff
- Supplies services that are not normally required by your business
- Has more than one principal (i.e. works for multiple clients, not just your business)
Exemptions are not automatic.
For instance, simply having an ABN and a website does not automatically satisfy the ‘services to the general public’ exemption.
You need to keep records.
You can find information on contractor exemptions on your state revenue office website — for example, Revenue NSW contractor provisions, State Revenue Office Victoria, or the Queensland Revenue Office.
What Happens If You Get It Wrong?
Consequences of not managing payroll tax contractors effectively include:
- Audit assessments (sometimes up to 5 years)
- Penalties (up to 75% in serious cases)
- Interest charges
- Reputational risk with clients and stakeholders
A small business may be affected in the following ways:
- Unexpected cash flow pressure from backdated liabilities
- Erosion of profit margins from penalties and interest
- Loss of director and stakeholder confidence
- Disruption to business growth and expansion plans
Most businesses underestimate the financial consequences until they receive an audit notice.
Practical Checklist: Are Your Contractors at Risk?
Use this quick review:
Low Risk
- Short-term project
- Contractor works for multiple clients
- Supplies own equipment
- Advertises publicly
Medium Risk
- Ongoing arrangement
- Some dependency on your business
- Incomplete or informal contract documentation
High Risk
- Labour-only contract
- Works mainly for you
- Integrated into operations
- Long-term engagement
If you are classified as medium or high risk, it is advisable to seek a professional review.
Scalability Risk: Growth Multiplies Exposure
As your business expands:
- You start hiring more contractors
- Different managers independently engage subcontractors
- You start operating in other states
- Your total wages bill exceeds state payroll tax thresholds
Each state has its own rules around payroll tax thresholds — and related businesses or entities may be grouped together, which can push you over the threshold sooner than expected.
Businesses operating across multiple states can face unexpected liabilities in each jurisdiction.
Small businesses often overlook the hidden costs of payroll. As explained in our guide to hidden costs of payroll pricing, unseen costs and compliance gaps can increase financial risk if left unaddressed.
Are you following a consistent process for contractor onboarding and review?
Governance Controls Every Small Business Should Implement
To manage payroll taxes for independent contractors, consider the following:
- Conduct an annual review of all contractor arrangements
- Maintain documented records of all exemption decisions and supporting evidence
- Keep an up-to-date register of all contractors engaged across the business
- Monitor state payroll tax thresholds regularly, especially if operating across multiple states
- Reconcile bookkeeping records against payroll tax returns each reporting period
Good records will protect you in case of a state revenue audit. Many growing businesses strengthen their contractor compliance by integrating structured payroll services, ensuring contractor payments, payroll reporting, and state-based tax reviews are aligned and regularly monitored.
Turning Payroll Risk into Structured Control
Understanding payroll tax rules for contractors is critical for small and growing businesses. The rules are not the same as ATO definitions and need to be evaluated on a state-by-state basis.
If you are unsure about your contractor payments, waiting for an audit is not a plan.
Befree helps Australian businesses with structured payroll compliance analysis, contractor risk analysis, and scalable finance processes built around state-based compliance requirements.
If you’re unsure whether your contractor payments could attract payroll tax, don’t wait for an audit notice, get a professional review today.
Quick FAQs
Can a contractor be paid through payroll?
Yes. The payment method does not determine whether payroll tax applies.
What is the 90-day rule?
In some states and territories, contractors working fewer than 90 days per financial year may qualify for exemption.
Are all contractor payments taxable?
No. Only payments that meet relevant contract provisions and do not qualify for an exemption are subject to payroll tax.
Does having an ABN exempt a contractor from payroll tax?
No. The nature of the working relationship determines liability.