Subcontractor compliance: WHS verification, licensing

Construction supply chains in Australia involve multiple tiers of subcontractors, each carrying distinct legal obligations around work health and safety (WHS), licensing, tax compliance, and worker welfare. For principal contractors and clients, verifying subcontractor compliance is not discretionary good practice. It is a legal requirement enforced through state and territory WHS regulators (SafeWork NSW, WorkSafe Victoria, Workplace Health and Safety Queensland, and equivalents), the ATO, and state building authorities, with penalties that range from financial penalties to criminal prosecution.

According to Safe Work Australia's 2025 statistics, the construction industry continues to record the highest number of worker fatalities of any industry in Australia, and one of the highest rates of serious workers' compensation claims (Safe Work Australia, Key WHS Statistics). Rigorous subcontractor vetting is the primary mechanism to reduce these figures and ensure regulatory compliance across the supply chain.

The regulatory framework for construction subcontracting in Australia

Three legislative pillars govern how contractors and subcontractors interact in the Australian construction industry.

Work Health and Safety (WHS) Acts

WHS legislation in Australia is primarily harmonised through the model WHS Act, adopted (with some variations) by all states and territories except Victoria (which maintains the Occupational Health and Safety Act 2004) and Western Australia (which adopted the WHS Act in 2022). The model WHS Act imposes a primary duty of care on persons conducting a business or undertaking (PCBUs), including principal contractors, to ensure the health and safety of workers and others at the workplace. This duty cannot be contracted out.

Principal contractors have specific duties under Division 3 of Part 5 of the WHS Regulations, including preparing WHS management plans for construction projects exceeding AUD 250,000, ensuring safe work method statements (SWMS) are prepared for high-risk construction work, and managing subcontractor safety on site.

State and territory building licensing

Each state and territory administers its own building licensing regime. In NSW, the NSW Fair Trading administers builder and trade contractor licences. In Victoria, the Victorian Building Authority registers building practitioners. In Queensland, the QBCC issues builder licences and monitors financial requirements. Before appointing any subcontractor, the principal contractor must verify that the subcontractor holds the appropriate licence for the work to be performed.

Building Confidence reforms

Following the Shergold-Weir Building Confidence report (2018), all states and territories have been implementing reforms to strengthen building compliance, including enhanced registration requirements for building practitioners, mandatory continuing professional development, and stricter documentation requirements. The National Registration Framework for building practitioners is progressively being implemented across jurisdictions.

Mandatory documents for construction subcontractors

The table below summarises the core documents that principal contractors must collect and verify for each subcontractor operating on Australian construction sites.

ABN and tax compliance

Before engaging a subcontractor, the principal contractor should verify the subcontractor's ABN via the Australian Business Register. If the subcontractor does not quote an ABN, the principal contractor must withhold 47% from the payment under the Pay As You Go (PAYG) withholding rules. The Taxable Payments Annual Report (TPAR) requires businesses in the building and construction industry to report payments made to subcontractors to the ATO by 28 August each year.

White cards: construction induction training

The white card (General Construction Induction Card) is mandatory for anyone carrying out construction work in Australia. It demonstrates that the holder has completed the national construction induction training program. While the white card does not expire, it can be cancelled by WHS regulators. The principal contractor must verify that each subcontractor's workers hold a valid white card before they access the site.

Modern slavery due diligence

The Modern Slavery Act 2018 (Cth) requires entities with annual consolidated revenue of AUD 100 million or more to publish an annual modern slavery statement. For construction supply chains, this obligation extends to assessing the risk of modern slavery practices within the supply chain. The construction sector has been identified by the Australian Border Force as one of the higher-risk sectors for labour exploitation in Australia. Principal contractors should request evidence of modern slavery due diligence from subcontractors regardless of their revenue threshold.

Right to work checks in construction

Employers in the construction sector must verify the work rights of every individual before they start work. The Visa Entitlement Verification Online (VEVO) system provides real-time verification of visa holders' work entitlements. Australian citizens and permanent residents can demonstrate their right to work through an Australian passport, certificate of Australian citizenship, or ImmiCard.

The civil penalty for employing an illegal worker is up to AUD 99,000 per worker for an individual and up to AUD 495,000 for a body corporate. In construction, where subcontractors may bring workers onto site at short notice, establishing a pre-site-access verification process is essential.

Penalties for non-compliance

The enforcement landscape for construction subcontractor compliance involves multiple regulators, each with independent penalty powers.

WHS penalties

WHS regulators can issue improvement notices, prohibition notices (stopping work immediately), and prosecute under the applicable WHS Act. Maximum penalties for a Category 1 offence (reckless conduct) under the model WHS Act are AUD 3 million for a body corporate and AUD 600,000 and/or 5 years' imprisonment for an individual. Category 2 offences (failure to comply with a health and safety duty) carry maximum penalties of AUD 1.5 million for a body corporate.

Building licensing penalties

Operating without a required licence is a criminal offence in all states and territories. Penalties vary by jurisdiction but can exceed AUD 110,000 for individuals and significantly more for corporations. In addition, work performed by unlicensed contractors may not be covered by statutory insurance or warranty schemes, leaving the principal contractor exposed to defect claims.

ATO penalties

Failure to lodge TPAR on time attracts administrative penalties. Failure to withhold from payments where no ABN is quoted results in the principal contractor becoming liable for the withheld amount, plus penalties and interest.

Automating subcontractor compliance verification

Managing compliance across a construction supply chain manually is error-prone and resource-intensive. A principal contractor working with 30 subcontractors faces approximately 250 document checks per year, each requiring verification of authenticity, validity dates, and scope of coverage.

The case for automation

Manual processes create three structural risks: documents expire between scheduled reviews, forgeries go undetected without systematic authenticity checks, and audit trails are incomplete when stored across emails and shared drives. A single expired workers compensation certificate discovered during a WHS inspection can trigger a site shutdown.

Document verification platforms like CheckFile.ai automate the collection, validation, and monitoring of subcontractor compliance documents. Automated expiry alerts, real-time authenticity checks, and centralised audit trails reduce the compliance burden from hours per subcontractor to minutes. Our data from over 180,000 documents processed monthly across regulated sectors confirms a 94.8% fraud detection rate and an 83% reduction in manual review time. View pricing plans designed for construction supply chains.

For a comprehensive overview, see our industry document verification guide.

Frequently asked questions

Do WHS obligations apply to labour-only subcontractors?

Yes. WHS duties apply to all PCBUs, including labour hire providers and labour-only subcontractors. The principal contractor's duty under the WHS Act extends to ensuring, so far as is reasonably practicable, the health and safety of all workers carrying out work as part of the project, regardless of whether they are employees, subcontractors, or labour hire workers.

Can a principal contractor be prosecuted for a subcontractor's WHS failings?

Yes. Under the WHS Act, the principal contractor owes a duty to all workers at the construction site and to other persons who may be affected by the work. If the principal contractor failed to ensure competent appointment or adequate supervision, they can be prosecuted alongside or instead of the subcontractor. WHS regulators have stated that duties are non-delegable — you cannot contract out your WHS obligations.

What happens if a subcontractor's white card is invalid?

Workers without a valid white card must not be permitted on a construction site. If a white card has been cancelled or the worker cannot produce evidence of holding one, they must complete the construction induction training again before accessing any construction site.

How often should subcontractor compliance documents be reviewed?

White cards should be verified at each site induction. Insurance certificates should be checked at renewal (annually). SWMS should be reviewed before each high-risk construction activity. Builder licences should be verified at engagement and at renewal. As a minimum, a full compliance review of each subcontractor should be conducted every 12 months or at contract renewal, whichever comes first.

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This article provides general information on construction subcontractor compliance in Australia. It does not constitute legal advice. Consult a construction lawyer for advice tailored to your circumstances and jurisdiction. Legislation current as of 25 March 2026.

See also: Industry verification guide | Vendor compliance certificate verification | KYB: complete guide to business entity verification

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