PCBU Duties: Your Primary Duty of Care Under WHS Law

PCBU stands for Person Conducting a Business or Undertaking. It is the legal term used in the WHS Act 2011 to describe anyone who runs a business — from a sole trader sparkie working out of a van to a multinational construction company with 5,000 employees. If you conduct a business or undertaking, you are a PCBU. Full stop.

The term replaced "employer" in most Australian WHS legislation because "employer" only covers people who employ staff. The modern construction industry is built on subcontracting, labour hire, and sole traders. A one-person plumbing business with no employees is still a PCBU. A labour hire company that places workers on construction sites is a PCBU. A property developer who engages a builder is a PCBU. The WHS Act casts a wide net because workplace safety is everyone's responsibility, not just the person who signs the pay cheques.

Here is the part that catches tradies off guard: if you are a subcontractor, you are a PCBU. Not just the builder. Not just the principal contractor. You. Every subbie who walks onto a construction site carries PCBU obligations under the WHS Act. That means you have a primary duty of care to your own workers (if you have any), to other workers on the site who might be affected by your work, and to visitors and members of the public in the vicinity of your work.

The consequences of ignoring your PCBU status are severe. Section 32 of the WHS Act makes it an offence for a PCBU to fail to comply with the primary duty of care where that failure exposes a person to a risk of death or serious injury. Maximum penalties under the NSW framework are approximately $2,235,363 for a body corporate and $447,122 for an individual under Category 2, escalating to $11,150,183 and up to 10 years imprisonment under Category 1. These are not theoretical numbers — Australian courts impose them every year.

Section 19 of the WHS Act 2011 is the single most important provision in Australian workplace safety law. It sets out the primary duty of care — the foundational obligation that every PCBU must meet. Here it is in plain English.

A PCBU must ensure, so far as is reasonably practicable, the health and safety of workers who carry out work for the business or undertaking, and other people who may be put at risk by the work.

Three phrases matter.

"Must ensure" — this is a positive obligation. You do not just avoid creating hazards. You actively ensure safety. That means identifying hazards, assessing risks, implementing controls, providing training, and monitoring compliance. It is proactive, not reactive. Waiting until something goes wrong before acting is not consistent with the duty.

"So far as is reasonably practicable" (SFAIRP) — the law does not require perfection. It requires you to do everything that is reasonably able to be done. The test considers the likelihood and severity of the hazard, what the PCBU knows or ought to know about the hazard, the availability and suitability of controls, and the cost of controls relative to the risk. A $50 guardrail that prevents a fatal fall is always reasonably practicable. A $500,000 engineering solution for a minor scratch hazard might not be. Courts apply the test objectively — what a reasonable PCBU in the same position would have done — not subjectively based on what this particular PCBU happened to think at the time.

"Health and safety" — not just safety. Health includes psychological health, exposure to harmful substances, noise-induced hearing loss, musculoskeletal disorders from manual handling, and long-term conditions like silicosis and mesothelioma. Your PCBU duty covers the slow-burn health effects, not just the acute injuries. This is why silica exposure, asbestos handling, and chemical use in construction attract such close regulator attention.

The primary duty is non-delegable. You can engage contractors, appoint safety officers, and hire consultants — but you cannot delegate your primary duty of care to anyone. If something goes wrong, the regulator comes to the PCBU. You cannot point at your safety adviser and say "I paid them to handle it." The duty is yours, and section 27 of the WHS Act imposes a separate personal duty of due diligence on officers of the PCBU so that the buck stops at the decision-making level as well.

Preparing a SWMS for high-risk construction work is one of the most visible ways a PCBU demonstrates compliance with the primary duty of care. The WHS Regulation 2025 requires a SWMS before any HRCW begins — and the PCBU is the person responsible for ensuring it exists, it is adequate, it is followed, and it is reviewed when conditions change.

Here is how the chain works in practice.

If you are a subcontractor performing HRCW — say, electrical work on a commercial fit-out — you are the PCBU who must prepare the SWMS. You identify the HRCW categories, assess the risks, write the controls, consult your workers, and sign the document as the preparer. You submit it to the principal contractor before work starts and provide it to your workers at the pre-start briefing for sign-on.

If you are the principal contractor, you have additional PCBU duties on top of your section 19 duty: obtain the SWMS from every subcontractor performing HRCW, review it for adequacy, keep it on site, and monitor that work is performed in accordance with it. If the SWMS is generic rubbish or the subbie is not following it, the PC must act — send it back, stop the work, or both. A PC who rubber-stamps inadequate SWMS has failed their own PCBU duty, regardless of what the subcontractor did.

If you are a self-employed tradie (sole trader), you are a PCBU with the same obligations. You prepare the SWMS for your own work. You cannot claim ignorance of the requirement because "I am just a one-man band." The WHS Act applies to every PCBU regardless of size, and courts have convicted sole traders for SWMS failures where the only injured worker was the sole trader themselves.

A SWMS is not just a piece of paper. It is evidence of your PCBU duty in action. It shows that you identified hazards, assessed risks, implemented controls, consulted workers, and planned the work before anyone picked up a tool. When an inspector audits your site, the SWMS is the first document they ask for. When a prosecutor builds a case after an incident, the SWMS (or the lack of one) is Exhibit A. A generic SWMS copied from a previous job without site-specific amendment has been repeatedly cited in Australian prosecution briefs as evidence that the PCBU failed to discharge the primary duty of care — the document existed but the underlying thinking was never applied to the actual workplace.

Your PCBU obligations under the WHS Act 2011 cover a broad range of responsibilities. Here is a practical checklist that translates the legislation into actions you can take on your next job.

Provide a safe workplace. This means the physical work environment — the site, the access routes, the amenities, the temporary structures. If you are a subbie, your obligation covers the immediate work area you control. If you are the PC, it covers the entire site.

Identify hazards and assess risks. Walk the site before work starts. Look at the work method. Ask your workers what could go wrong. Use a 5×5 risk matrix to score each hazard before and after controls. This is not a one-time exercise — reassess whenever conditions change.

Prepare a SWMS for HRCW. If any of the 18 HRCW categories in Schedule 1 of the WHS Regulation 2025 apply to your work, a SWMS is mandatory. Not optional. Not "best practice." Mandatory. The SWMS must be site-specific, risk-assessed, and signed by workers before HRCW begins.

Provide information, training, and instruction. Every worker must understand the hazards they face and the controls in place. This includes site induction, SWMS briefing (toolbox talk), task-specific training (for example EWP operation, confined space entry, working at heights), and ongoing safety communication throughout the project.

Provide health monitoring if required. Some hazards require health monitoring — audiometric testing for noise-exposed workers, lung function testing for dust-exposed workers, blood lead levels for lead workers. Check the WHS Regulation 2025 Part 7 for the specific triggers and the intervals for monitoring.

Consult workers on WHS matters. Section 47 of the WHS Act requires you to consult workers who are (or are likely to be) directly affected by a WHS matter. This means involving workers in SWMS preparation, risk assessments, and incident investigations — not just telling them what to do after the decision has been made.

Report notifiable incidents. If a workplace incident results in death, serious injury or illness, or a dangerous incident (collapse, uncontrolled explosion, electrical shock, fall from height, uncontrolled release of substance), you must notify the regulator immediately. Failure to notify is a separate offence with its own penalties.

Maintain records. Keep SWMS, sign-on sheets, training records, incident reports, plant inspection records, and hazardous chemicals SDS on file and accessible. Records are your evidence of compliance, and the absence of records is often the foundation of prosecution.

Each of these obligations is a strand in the primary duty of care. Miss one and the whole fabric weakens. An inspector does not check just one — they check all of them during a comprehensive audit.

The WHS Act 2011 creates three categories of offence for PCBUs who breach their duties. The penalties are designed to be severe enough to deter non-compliance — and Australian courts are applying them with increasing force.

Category 1 — Reckless conduct (section 31). A PCBU engages in conduct that exposes a person to a risk of death or serious injury or illness and is reckless as to the risk. Maximum penalty under the NSW framework is approximately $11,150,183 (body corporate) or $2,318,844 and up to 10 years imprisonment (individual). This is the most serious WHS offence in Australia and is reserved for cases where the PCBU knew about the risk and consciously disregarded it.

Category 2 — Failure to comply with duty, exposing to risk (section 32). A PCBU fails to comply with a health and safety duty and the failure exposes a person to a risk of death or serious injury or illness. Maximum penalty is approximately $2,235,363 (body corporate) or $447,122 (individual). This is the most commonly prosecuted PCBU offence. It does not require recklessness — just a failure to comply that creates a risk.

Category 3 — Failure to comply with duty (section 33). A PCBU fails to comply with a health and safety duty. Maximum penalty is approximately $748,492 (body corporate) or $149,698 (individual). This covers breaches that do not necessarily expose anyone to serious risk — procedural failures, missing documentation, failure to consult.

Industrial manslaughter is now an offence in every Australian state and territory, the ACT, and at the Commonwealth level. Penalties reach approximately $18 million for a body corporate and 20 to 25 years imprisonment for an individual officer. The offence generally applies where a PCBU or senior officer's negligent or reckless conduct causes a worker's death. SWMS failures — no SWMS, generic SWMS, SWMS not followed — feature routinely in industrial manslaughter investigations as foundational evidence of the underlying duty breach.

The pattern in Australian SWMS prosecutions is consistent across jurisdictions. A PCBU failed to prepare a site-specific SWMS, failed to brief workers on its contents, failed to monitor compliance with the controls, or failed to stop work when the SWMS was not being followed. A worker was injured or killed. The regulator investigated, identified the SWMS failure as a foundational breach, and pursued prosecution. Fines typically range from $100,000 to $500,000 for Category 2 convictions with significant individual penalties on officers where the due diligence duty under section 27 was also breached.

The primary duty of care applies to the PCBU — the business entity — but the WHS Act also imposes a separate personal duty on "officers" of the PCBU under section 27. An officer is a person who makes or participates in making decisions that affect the whole or a substantial part of the business. In a company this typically includes directors, partners, and senior managers. In a sole trader operation the officer is the sole trader themselves.

The officer duty requires the officer to exercise due diligence to ensure the PCBU complies with its duties under the WHS Act. Due diligence includes acquiring up-to-date knowledge of WHS matters, understanding the hazards and risks of the operations, ensuring the PCBU has appropriate resources and processes to eliminate or minimise risks, ensuring the PCBU has processes for receiving and considering information about incidents and hazards, and verifying that the processes are working as intended.

The practical implication: an officer cannot hide behind the company. If the company is prosecuted for a SWMS failure, the officers responsible for the relevant decisions can also be prosecuted under section 27 for failing to exercise due diligence. The penalties for individual officers mirror the individual maximums under sections 31 to 33 of the Act and include imprisonment for Category 1 offences.

Officer liability is a deliberate feature of the WHS framework. It exists to prevent directors and senior managers from outsourcing safety to junior staff or external consultants while remaining insulated from the consequences. Australian courts have pursued officer prosecutions in parallel with company prosecutions in serious cases, and in industrial manslaughter cases the officer is sometimes the primary defendant.