Few decisions carry as much hidden liability as calling a worker a contractor. The arrangement feels simple — they invoice, you pay, no payroll to run — but if the ATO or Fair Work later decides that person was an employee, the cost is backdated across the entire engagement. Here is how classification actually works in Australia.
What is the difference between a contractor and an employee?
An employee works in your business. You direct how the work is done, they use your systems and equipment, they are paid for their time rather than for a result, and they cannot send someone else in their place. A contractor runs their own business and is engaged to deliver an outcome. They set their own hours and methods, supply their own tools, carry the risk of fixing defects at their own cost, can delegate the work, and are generally free to take on other clients. No single factor decides it — the whole relationship is weighed together.
Does an ABN or a signed contract settle the question?
No. This is the most common and most expensive misunderstanding. An ABN is a registration number, and a contract is a description of what the parties intended. Neither overrides the substance of how the work is actually performed. A worker can quote an ABN, issue an invoice every Friday, and still be an employee at law if in practice they turn up when you tell them, do the work how you tell them, and have no genuine business of their own. Courts and the ATO look through the label to the reality.
Do I still have to pay super to genuine contractors?
Frequently, yes. The superannuation guarantee rules contain an extended definition: where someone is engaged under a contract that is wholly or principally for their labour, super is payable on the labour component even if they are a contractor for every other purpose. This catches a large share of sole-trader arrangements — the tradesperson paid mainly for their time, the consultant billing days rather than deliverables. Businesses that classify correctly but ignore this extension still end up with a super shortfall. Our overview of superannuation guarantee obligations covers how the charge is calculated.
What does misclassification actually cost?
The exposure stacks. Unpaid PAYG withholding that should have been deducted. Superannuation guarantee charge, which is not deductible and includes a nominal interest component plus an administration fee per employee per quarter. State payroll tax, where contractor payments can be caught by the relevant contract provisions. Leave entitlements — annual, personal, and long service — that were never accrued. Then penalties, including for sham contracting where the arrangement was set up deliberately to avoid employment obligations. Because liability runs from the start of the engagement, a five-year contractor relationship reassessed as employment is a serious event, not a paperwork correction.
Which arrangements are most likely to be reassessed?
Long-running engagements where the person works set hours alongside your employees. Workers who have only one client, yours. Arrangements where you supply the vehicle, tools, uniform, or software licence. Workers who cannot subcontract the job. Situations where the contractor was previously your employee doing the same role. And labour-hire style arrangements where an individual interposes a company or trust but nothing about the day-to-day work changes — the interposed entity does not fix an employment relationship, and personal services income rules may apply on top.
How should a business manage the risk?
Decide classification before the work starts, not after an audit letter arrives. Run each engagement against the ATO's indicators and keep a short written record of the reasoning. Make the commercial substance real: scope the work as a deliverable, let the contractor control the method, and do not quietly slide into rostering them. Review long-standing contractors annually, because roles drift — the specialist you engaged for a project three years ago may now simply be staff. Where the answer is genuinely borderline, get advice, and consider whether the cost saving justifies the exposure at all.
What if I have already got it wrong?
Fix it forward and deal with the past deliberately. Voluntary disclosure to the ATO generally produces a better outcome than being found in an audit, and the super guarantee charge grows the longer it is left. Reclassifying a worker going forward is usually straightforward — onboarding them into payroll, registering for Single Touch Payroll reporting if you are not already, and accruing entitlements correctly from that point. The historical liability needs to be quantified so you know what you are dealing with rather than hoping it stays quiet.
Classification is a judgement call with real money attached, and it is worth getting a second opinion before you commit. The Metier Group advises Perth businesses on worker classification, payroll setup, and employer obligations through our business services. Contact us if you have contractors you are not entirely sure about.