Subbies vs Employees: QBCC & ATO Risks for Builders
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If you’re the owner of a growing construction business, you know that hiring decisions affect more than just your weekly roster.
Getting it right means building your business on solid ground. But bringing in too many “subbies” (aka contractors) or misclassifying workers can put your QBCC licence, cash flow, and reputation at risk.
So, should you hire staff or use contractors?
As specialist construction accountants, here’s how we help our clients weigh up this decision.
Hiring Subbies vs Employees.
Simply put, an employee works set hours under your direction, receives wages with tax and super deducted, and enjoys entitlements exclusive to employees. Contractors, by contrast, run their own business, choose how they work, pay their own tax and super, and can service multiple clients.
Why the Distinction Matters
It’s easy to blur the line between subbies versus employees, but if your contractor works like an employee, expect the ATO and Fair Work to chase you for back-paid super, PAYG, and penalties.
Getting the labour mix right prevents small mistakes from becoming big licence risks.
Subbies vs Employees: Key Differences at a Glance
Real Cost Considerations
Employee on-costs add 25–40% to wages once you include super, workers’ compensation, leave, and other mandatory costs.
Contractors can seem cheaper. But if they have set hours, use your tools, or don’t have their own business, the ATO can reclassify them as employees. That means backpay and penalties.
How Labour Choices Impact QBCC Compliance.
Getting your labour mix right goes beyond wages — it’s key to QBCC requirements. High employee on-costs or contractor payments reduce profits, weakening financial metrics.
QBCC checks these numbers at licence renewal. Poor ratios can trigger reviews or extra conditions, especially if cash flow is tight.
Key Financial Metrics at Risk
Net Tangible Assets (NTA):
Every dollar spent on wages or subbies cuts into profit and cash reserves. Lower profits weaken your NTA and can trigger a licence review.
Current Ratio:
Labour costs also hit your available cash. If your current ratio drops below QBCC’s requirement, your licence is at risk.
Profit Margin:
Contractors usually charge higher rates. If you’re not pricing jobs to cover the real cost, your margins will suffer.
Plus, if your records don’t clearly distinguish legitimate subbies vs employees, QBCC auditors will notice. Misclassifying subbies won’t directly suspend your licence, but poor records and reclassifications mean more QBCC scrutiny.
Payroll Tax Traps
Payroll tax doesn’t just apply to employees. In Queensland, regular contractor payments often count under relevant contract rules, which exclude truly independent subbies (e.g., those with their own ABN, insurance, and multiple clients).
If a contractor works with you regularly or their contract looks like employment (e.g., same hours, ongoing jobs), those payments usually count toward your payroll tax threshold.
If your total wages plus eligible contractor payments go over $1.3 million, you must register and pay payroll tax in Queensland.
There are limited exemptions, but most construction businesses find their subbie payments don’t qualify, especially if the contractor only works for them.
The bottom line:
Use the same subbies all year, and you’ll hit the payroll tax threshold faster than you think. That means extra tax, penalties, and interest.
Risks of Classifying Workers Incorrectly
ATO audits on sham contracting are on the rise. Misclassifying workers can cost larger businesses up to $495,000 in fines, not to mention back payments.
Risk factors to watch:
- Subbies working mainly for you, set hours, your tools/branding
- No formal contract or insurance evidence
- “Contractors” who act like staff
Licence risk is real. The wrong labour mix can trigger a QBCC review or even suspension, so you don’t want to leave it to chance.
Subbies vs Employees: Cash Flow Predictability vs Flexibility.
Model the true cost before you grow your crew.
Employees
Payroll gives predictability, but super, leave, and WorkCover drain cash. Miss a pay run, and you risk team confidence as well as your licence.
Contractors
Invoices give flexibility but make cash outflows lumpy. Miss a BAS or underpay GST, and the ATO will come knocking.
How to Stay Compliant When Hiring.
Most problems start with handshake deals and missing paperwork. Good systems are your first line of defence for ATO, Fair Work, and QBCC headaches.
Your Compliance Checklist:
Don’t wait for an audit to find the gaps. We can review your systems before the regulator calls.
Example: a QLD Builder’s Hiring Dilemma
A Queensland builder with $8 million turnover has six staff on wages and several subbies. As new jobs come in, the director must choose: hire two more carpenters on wages or bring in two regular contractors who’ll be on site most weeks.
Quantum House models both:
We help the builder look past the headline cost, comparing the total cost and compliance impact of each option:
- Hiring wage staff means higher ongoing costs, but you get predictable payroll, stronger QBCC ratios, and peace of mind on compliance.
- Engaging subbies offers flexibility and a lower day rate, but it also increases payroll tax and ATO risk if contractors aren’t truly independent. Rely too much on contractors, and your QBCC ratios can suffer if margins are tight.
By reviewing work patterns, contracts, and how each option will affect the business’s QBCC metrics and cash flow, Quantum House can show which hiring path keeps the builder compliant and financially strong — before any new contracts are signed.
The upshot: a proactive review means the builder can pick the hiring structure that fits their growth plans and QBCC obligations — reducing compliance headaches down the track.
Common Questions from Construction Owners.
Can I use contractors for flexibility and less admin?
Only if they’re truly independent; if you control their work, set hours, or supply tools, you risk ATO and QBCC penalties.
Do I pay super for subbies?
Oftentimes, yes — especially when the contractor is paid for their own labour. Always check the ATO’s guidelines.
How does labour affect my QBCC licence?
Your licence depends on margins, cash, and NTA. High labour costs or misclassification can trigger reviews or suspension.
Building the Right Labour Mix.
Hiring subbies vs employees shapes your cash flow, QBCC compliance, and business health. Every option has costs and risks. Model your choices and tighten your systems as you grow.
Feeling the pressure of growth or worried about ATO and QBCC scrutiny? Now’s the time to get ahead. Quantum House specialises in QBCC accounting and compliance reviews, so your business stays strong from the ground up.