Every Australian employer has a legal duty to keep people safe at work — and the obligations are broader (and the penalties heavier) than many small business owners realise. This guide explains work health and safety (WHS) obligations in plain English: who holds the duty, what “reasonably practicable” means, what you actually have to do, and the consequences of getting it wrong. It’s the starting point for the rest of our safety series, and it pairs with our free WHS policy templates so you can put the obligations into practice.
Quick summary
- Who holds the duty:
The PCBU (the business) has the primary duty — it’s non-delegable
- The standard:
Ensure health and safety ‘so far as is reasonably practicable’
- Consult:
You must consult workers and health and safety representatives on WHS matters
- The stakes:
Penalties are steep and industrial manslaughter is now an offence in most states
Who is responsible: the PCBU
Australia’s model WHS laws place the primary duty on the person conducting a business or undertaking (PCBU) — in practice, the business or employer. The PCBU must ensure, so far as is reasonably practicable, the health and safety of workers and anyone else affected by the work (customers, visitors, the public).
Two points catch small businesses out:
- The duty is non-delegable. You can delegate tasks, but not the legal responsibility — including to contractors, labour hire, or a safety consultant.
- Officers have their own duty. Directors and senior officers must exercise due diligence to ensure the business meets its WHS obligations. For a deeper definition, see our occupational health & safety glossary entry.
What 'reasonably practicable' means
You don’t have to eliminate every conceivable risk — you have to do what is reasonably practicable. That weighs up:
- The likelihood of the hazard causing harm
- The degree of harm that could result
- What you know (or ought to know) about the hazard and ways to control it
- The availability and suitability of controls
- And only then, the cost of controlling the risk
Cost comes last, and can only be weighed against the risk — you can’t skip a control simply because it’s inconvenient. Controls follow the hierarchy of controls: eliminate the hazard first, then substitute, isolate or engineer it out, then administrative controls, with PPE as the last line.
The six things you must provide
The primary duty breaks down into six practical obligations. You must provide and maintain:
A safe work environment
Safe premises, layout and conditions for the work being done.
Safe systems of work
Documented safe procedures, and safe ways of doing the job.
Safe plant, equipment & substances
Equipment that is safe, maintained, and used correctly.
Adequate facilities
Amenities for worker welfare appropriate to the workplace.
Information, training & supervision
Instruction matched to each worker’s role and risk exposure.
Health & condition monitoring
Ongoing monitoring of worker health and workplace conditions.
Underpinning all six is a duty to consult — you must consult workers and any health and safety representatives (HSRs) when identifying hazards, making decisions about controls, and changing work that affects health and safety.
How to meet your obligations
In practice, meeting your WHS duty comes down to a repeatable cycle:
- Identify hazards in your workplace and work.
- Assess and control the risks using the hierarchy of controls — see our guide on how to conduct a WHS assessment.
- Document your safety framework — a WHS policy and supporting policies. Our guide on how to write a workplace policy walks through it.
- Train and induct workers, and re-induct when things change.
- Consult workers and HSRs throughout.
- Review after incidents or when work changes.
HR software with policy management helps you distribute policies, capture acknowledgements, and prove workers were informed — a key part of demonstrating due diligence.
The penalties for getting it wrong
The stakes have risen sharply
WHS penalties have increased significantly, and most Australian jurisdictions now have an industrial manslaughter offence carrying heavy fines and potential imprisonment where a breach causes death. The WHS Act also voids insurance for these penalties. Safety compliance isn’t paperwork — documented risk management and due diligence are how you demonstrate you met the duty.
The three deeper topics in this series build on these obligations: managing psychosocial hazards at work, incident reporting and notifiable incidents, and contractor and labour-hire safety.
Turn your WHS obligations into a system, not a scramble. RosterElf’s HR tools help you distribute safety policies, capture acknowledgements, track certifications and keep the records that demonstrate due diligence — start from our free safety & compliance policy templates.
Frequently asked questions
What are an employer's WHS obligations in Australia?
Under the model WHS Act, the business (PCBU) must ensure health and safety so far as is reasonably practicable — providing a safe work environment, safe systems of work, safe plant and equipment, adequate facilities, information/training/supervision, and health monitoring. You must also consult workers, and officers must exercise due diligence. The duty is non-delegable.
What is a PCBU?
PCBU stands for ‘person conducting a business or undertaking’ — the WHS term for the entity that holds the primary safety duty, usually the employer or business. The PCBU must ensure worker health and safety so far as is reasonably practicable, and this duty cannot be handed to contractors, labour hire or individual workers.
What does 'reasonably practicable' mean in WHS?
It means doing what is reasonably able to be done to ensure health and safety, weighing the likelihood and degree of harm, what you know about the hazard and its controls, and the availability and suitability of those controls — with cost considered last and only against the level of risk. You can’t skip a reasonable control simply because it’s inconvenient or costs money.
Does a small business need a WHS policy?
WHS duties apply to every business regardless of size. While a written WHS policy isn’t itself mandated for every tiny employer, having documented policies, risk assessments, training and consultation records is how you demonstrate you met your obligations — and it’s expected if there’s ever an incident or inspection. A free WHS policy template is a practical starting point.
What are the penalties for breaching WHS laws?
Penalties have increased significantly across Australia and scale with the seriousness of the breach. Most jurisdictions now have an industrial manslaughter offence carrying large fines and potential imprisonment where a breach causes death, and the WHS Act voids insurance for these penalties. Officers can be personally liable for failing their due-diligence duty.
