Introduction: The Dual Framework That Confuses Australian Businesses
If you operate a business in Australia, you have almost certainly encountered the terms OHS and WHS used interchangeably. Sometimes in the same document. Sometimes in the same sentence. The confusion is understandable — Australia’s workplace health and safety landscape is built on a dual legislative framework that combines a harmonised national model with state and territory variations, and one jurisdiction that has deliberately stood apart from the rest.
The stakes of misunderstanding this framework are not trivial. A Category 1 offence under the Model Work Health and Safety Act carries penalties of up to $3 million for corporations, $600,000 for officers, and up to five years imprisonment for individuals. Getting your compliance obligations right is not optional — and staying on top of those obligations as legislation evolves requires more than a spreadsheet. For further context, see our guide on WHS risk management. For further context, see our guide on WHS risk register.
This guide breaks down Australia’s OHS and WHS legislative framework from the ground up. We cover the history of harmonisation, the Model WHS Act and its core requirements, the state and territory variations every employer needs to know, and how a compliance register and legislation library can help your organisation stay ahead of regulatory change.
OHS vs WHS: What Is the Difference?
The terms OHS (Occupational Health and Safety) and WHS (Work Health and Safety) refer to the same core concept — protecting the health, safety, and welfare of people at work — but they reflect different legislative eras and jurisdictions.
OHS is the older terminology, used by Victoria and historically by several other states before the harmonisation reforms of 2011. Victoria continues to use its own Occupational Health and Safety Act 2004, which is why the term OHS persists in Victorian workplaces today.
WHS is the updated terminology introduced through the model legislation developed by Safe Work Australia beginning in 2009. The Model Work Health and Safety Act 2011 was designed to create a nationally consistent framework, and most Australian jurisdictions adopted their own versions of it from 2012 onwards. Western Australia was the last major adopter, enacting its Work Health and Safety Act 2020 which came into force in March 2022.
For compliance purposes, the terminology you use will depend on which jurisdiction governs your workplace. If you operate in Victoria, your primary legislation is the OHS Act 2004. Everywhere else, you are operating under WHS legislation — either the Model WHS Act itself (as adopted by the Commonwealth for federal employees) or a state or territory version of it.
The Road to Harmonisation: A Brief History
Before 2012, Australia had eight separate workplace safety laws across its eight states and territories, plus a separate federal system. Each had different definitions, different obligations, different penalty structures, and different codes of practice. A national business operating across multiple jurisdictions faced a compliance nightmare — needing to track multiple regulatory frameworks simultaneously and adapt its safety systems for each location.
In 2008, the Council of Australian Governments (COAG) agreed to pursue harmonisation of workplace safety laws. Safe Work Australia — a tripartite body comprising representatives of the Commonwealth, states and territories, employers, and unions — was established in 2009 with a mandate to develop model WHS legislation.
The result was the Model Work Health and Safety Act 2011, accompanied by the Model Work Health and Safety Regulations 2011 and a suite of model Codes of Practice. The intent was that each jurisdiction would enact their own version of the model law, creating a consistent national framework while retaining local regulatory infrastructure.
Most jurisdictions adopted the model legislation between 2012 and 2012, with Queensland, NSW, ACT, NT, Tasmania, South Australia, and the Commonwealth all coming on board in that initial wave. Western Australia held out until 2020. Victoria — with its well-established OHS Act and strong union movement — remains the notable exception and has not adopted the model law to date, though there is ongoing discussion about future alignment.
The Model WHS Act: Core Concepts and Obligations
Whether you are looking at the NSW Work Health and Safety Act 2011, the Queensland Work Health and Safety Act 2011, or any other state version, the structure and core obligations are substantially the same. Understanding the Model WHS Act gives you a solid foundation for compliance in all harmonised jurisdictions.
Person Conducting a Business or Undertaking (PCBU)
One of the most significant conceptual changes introduced by the Model WHS Act is the shift from “employer” to “Person Conducting a Business or Undertaking” (PCBU). This broader definition captures not just traditional employment relationships but also sole traders, partnerships, company directors, labour hire agencies, host employers, and a range of other parties who may have influence over a workplace.
The PCBU concept recognises that modern work arrangements are complex. Workers may be employed by one entity but working under the direction of another. Contractors may share a workplace with employees of multiple PCBUs. The legislation requires that all relevant PCBUs consult, cooperate, and coordinate with each other to ensure the health and safety of all workers at a shared workplace.
The Primary Duty of Care
The primary duty of care under the Model WHS Act requires a PCBU to ensure, so far as is reasonably practicable, the health and safety of workers and others in the workplace. The phrase “so far as is reasonably practicable” is critical — it means the duty is not absolute, but it requires PCBUs to do what they reasonably can to eliminate or minimise risks.
What is reasonably practicable is determined by weighing the likelihood of the hazard or risk occurring, the severity of the potential harm, what a person knows or ought reasonably to know about the hazard, the availability and suitability of ways to eliminate or minimise the risk, and the cost of eliminating or minimising the risk. Cost alone is never sufficient justification for failing to address a risk — it must be grossly disproportionate to the risk for it to be considered impracticable.
Specifically, the primary duty of care covers: providing and maintaining a work environment without risks to health and safety; providing and maintaining safe plant, structures, and systems of work; ensuring safe use, handling, and storage of plant, structures, and substances; providing adequate facilities for workers; providing information, training, instruction, and supervision; and monitoring worker health and workplace conditions.
Officer Duties
The Model WHS Act introduces a specific duty for “officers” — directors, partners, senior managers, and others who exercise significant influence over a PCBU’s management. Officers must exercise due diligence to ensure the PCBU complies with its WHS duties. This is a proactive obligation, not merely a reactive one.
Due diligence under the Act involves acquiring and keeping up-to-date knowledge of WHS matters, understanding the nature of the business and its hazards, ensuring appropriate resources and processes are in place for managing WHS, ensuring the PCBU receives information about incidents and near-misses, and ensuring that information is acted upon. In practice, this means officers cannot simply delegate WHS to a safety manager and consider their responsibility discharged — they must actively oversee WHS performance.
Worker and Other Persons Duties
Workers — broadly defined to include employees, contractors, subcontractors, labour hire workers, apprentices, trainees, students on work experience, and volunteers — also carry duties under the Model WHS Act. Workers must take reasonable care for their own health and safety, take reasonable care not to adversely affect the health and safety of others, comply with reasonable instructions from the PCBU, and cooperate with WHS policies and procedures.
Other persons at the workplace, such as visitors and customers, also have a duty to take reasonable care for their own health and safety and comply with reasonable instructions given for WHS purposes.
Consultation Requirements
The Model WHS Act places significant emphasis on consultation. PCBUs must consult workers about WHS matters that directly affect them — including identifying hazards and risks, making decisions about risk controls, proposing workplace changes, and developing procedures for welfare facilities, consultation, resolving WHS issues, monitoring worker health, and investigating incidents.
Workers may request that a Health and Safety Representative (HSR) be elected for their work group. PCBUs must support this process and cannot obstruct it. HSRs have specific powers, including the ability to direct work to stop if they believe there is an imminent serious risk to health and safety.
State and Territory Variations: What You Need to Know
While the harmonised WHS laws are substantively consistent, each jurisdiction’s implementation has some local variations. These are typically minor — differences in penalty amounts, specific codes of practice, prescribed forms, or local regulatory body processes — but they matter for compliance purposes. Here is a jurisdiction-by-jurisdiction overview.
New South Wales
NSW was one of the first states to adopt the model legislation, enacting the Work Health and Safety Act 2011 (NSW) which commenced on 1 January 2012. The regulator is SafeWork NSW. NSW has a well-developed suite of codes of practice that build on the national model codes, covering everything from managing noise in the workplace to managing psychosocial hazards.
A notable NSW development is its early and strong focus on psychosocial hazards. SafeWork NSW has been active in prosecuting cases involving psychological injury and has developed guidance specific to industries with high exposure to psychosocial risks, such as health, education, and emergency services.
Victoria
Victoria operates under the Occupational Health and Safety Act 2004 (Vic) and the Occupational Health and Safety Regulations 2017 (Vic), administered by WorkSafe Victoria. While the structural difference from the harmonised framework is significant in theory, in practice many of the core duties and concepts are similar — Victoria was itself a model for many of the Model WHS Act’s provisions.
Key differences in Victoria include the use of the term “employer” rather than “PCBU” for the primary duty holder, the absence of an equivalent to the “officer” duty (though company directors may still be personally liable under other provisions), and the role of Health and Safety Representatives, which is stronger in Victoria than in most harmonised jurisdictions.
Organisations operating in Victoria alongside other states must maintain separate compliance registers for their Victorian OHS obligations and their WHS obligations elsewhere. This is where a centralised compliance management platform becomes particularly valuable.
Queensland
Queensland enacted the Work Health and Safety Act 2011 (Qld), which commenced on 1 January 2012. The regulator is the Work Health and Safety Regulator, operating as part of the Office of Industrial Relations. WorkSafe Queensland is the operational arm that handles inspections, investigations, and prosecutions.
Queensland has specific regulations for high-risk industries, including mining (governed by separate legislation under the Coal Mining Safety and Health Act 1999 and the Mining and Quarrying Safety and Health Act 1999), construction (with specific requirements under the WHS Regulation for construction work), and hazardous chemical management.
Western Australia
Western Australia was the last major jurisdiction to adopt harmonised WHS legislation, with the Work Health and Safety Act 2020 (WA) commencing on 31 March 2022. The regulator is WorkSafe WA. The WA Act closely follows the model legislation but includes some WA-specific provisions, particularly for high-risk industries like mining and petroleum.
Organisations that previously operated under the Occupational Safety and Health Act 1984 (WA) needed to update their compliance registers and safety systems to reflect the new framework. The transition brought significant changes to the definition of duty holders, consultation requirements, and the introduction of officer duties — all of which needed to be captured in compliance management systems.
South Australia, Tasmania, ACT, and Northern Territory
South Australia enacted the Work Health and Safety Act 2012 (SA), commencing 1 January 2013, with SafeWork SA as regulator. Tasmania enacted the Work Health and Safety Act 2012 (Tas), commencing 1 January 2013, with WorkSafe Tasmania as regulator. The ACT enacted the Work Health and Safety Act 2011 (ACT), commencing 1 January 2012, administered by WorkSafe ACT. The Northern Territory enacted the Work Health and Safety (National Uniform Legislation) Act 2011, administered by NT WorkSafe.
All four jurisdictions are closely aligned with the model legislation, with relatively minor local variations. For multi-site organisations operating in these jurisdictions alongside NSW or Queensland, the compliance burden is relatively manageable because the frameworks are substantially consistent.
Incident Notification and Reporting Obligations
All jurisdictions require PCBUs to notify the regulator when certain workplace incidents occur. Under the harmonised WHS laws, notifiable incidents include the death of a person, a serious injury or illness, or a dangerous incident. The notification must be made immediately after the person becomes aware of the incident, and a written notification must follow within 48 hours (for dangerous incidents) or as prescribed.
A “serious injury or illness” under the harmonised legislation includes injuries requiring immediate treatment as an in-patient, immediate treatment for amputation, serious head or eye injuries, serious burns, separation of skin from underlying tissue (degloving), spinal injuries, loss of bodily functions, and serious lacerations. It also includes any infection where the work was a significant contributing factor, including occupationally acquired infections.
A “dangerous incident” includes incidents that expose someone to a serious risk even if no injury results — examples include an uncontrolled escape of a hazardous substance, an explosion, a collapse of a structure, and electric shocks. These must be notified even where no-one was actually harmed.
PCBUs must also preserve the incident site after a notifiable incident until the regulator attends or provides clearance. This obligation is separate from and in addition to the notification requirement.
WHS Regulations and Codes of Practice
The Model WHS Act is the primary legislation, but it is supplemented by two other important layers: the Model Work Health and Safety Regulations 2011 and the suite of model Codes of Practice.
The Regulations set out more detailed requirements for specific hazards and activities. They cover construction work, hazardous chemicals, asbestos, confined spaces, falls from heights, noise, traffic management, first aid, emergency plans, and a range of other specific topics. PCBUs whose operations involve these hazards must comply not just with the Act but with the detailed requirements of the Regulations.
Codes of Practice provide practical guidance on how to achieve the outcomes required by the Act and Regulations. They are not legally binding in the same way as the Act and Regulations, but they carry significant weight — a PCBU that follows an applicable Code of Practice will generally be taken to have met the relevant duty, and a PCBU that has not followed a Code may be required to demonstrate that they managed the risk equally well by another means.
Safe Work Australia maintains and updates the model Codes of Practice, which are then adopted (with or without modification) by each jurisdiction. Keeping track of which Codes apply in each jurisdiction — and when they are updated — is a non-trivial compliance task for organisations operating across multiple states.
Psychosocial Hazards: The Emerging Compliance Priority
One of the most significant recent developments in Australian WHS law is the formalisation of obligations around psychosocial hazards — factors in the design or management of work that can cause psychological harm. These include excessive workload, poor supervisor support, exposure to traumatic events, workplace bullying, harassment, and violence.
Most harmonised jurisdictions have now either enacted specific psychosocial hazard regulations or incorporated guidance through model Codes of Practice. The Model Code of Practice: Managing Psychosocial Hazards at Work, published by Safe Work Australia, provides detailed guidance on identifying, assessing, and controlling psychosocial risks.
South Australia was the first jurisdiction to enact standalone psychosocial hazard regulations in 2023. NSW followed with its Code of Practice for Managing Psychosocial Hazards at Work. Queensland and other jurisdictions have similar frameworks in development or recently implemented. Victoria, under its separate OHS Act, also addresses psychological health and has specific guidance from WorkSafe Victoria.
For compliance purposes, psychosocial hazards must be treated with the same rigour as physical hazards — identified, assessed, controlled, and monitored. They need to appear in your compliance register alongside your other WHS obligations, with clear ownership and review cycles.
Using a Compliance Register to Manage WHS Obligations
Given the complexity of Australia’s WHS landscape — eight jurisdictions, two major legislative frameworks, hundreds of regulations and codes, and a steady stream of legislative amendments and new guidance — maintaining compliance manually is increasingly impractical for any organisation of meaningful size.
A compliance register is the foundational tool for managing WHS obligations systematically. At its core, it is a structured record of every legal obligation that applies to your organisation, organised in a way that makes it easy to assign ownership, set review cycles, track the status of each obligation, and produce evidence of compliance when required by a regulator or auditor.
For WHS compliance specifically, your compliance register should capture the legislation and regulation that creates each obligation, the specific section or provision, a plain-language description of what the obligation requires, which business unit or role is responsible for meeting it, when the obligation was last reviewed, and what evidence exists to demonstrate compliance. Obligations should be linked to your risk register so that the relationship between compliance gaps and operational risks is visible.
The Role of a Legislation Library in WHS Compliance
A compliance register alone is not sufficient to manage WHS obligations over time. Legislation changes. Codes of Practice are updated. New regulations are introduced. Prosecutions change the interpretation of existing duties. Staying on top of these changes requires a complementary tool: a legislation library.
A legislation library is a centralised, curated repository of the laws and regulations that apply to your organisation. Unlike a general-purpose legal database, a legislation library tailored to your business contains only the legislation that is relevant to your operations, in the jurisdictions where you operate, updated in near real-time as changes occur.
Lahebo’s Legislation Library feature does exactly this. When a WHS law is amended — a new regulation comes into force, a code of practice is revised, a penalty amount changes — Lahebo alerts the relevant compliance owners so they can review and update the affected obligations in their compliance register. This closes the loop between legislative change and operational compliance, ensuring that your register remains accurate and your obligations remain current.
For organisations operating across multiple jurisdictions, the Legislation Library is particularly valuable. Instead of monitoring the websites of eight separate regulators and Safe Work Australia, your compliance team receives curated updates relevant to your specific footprint — NSW WHS regulations, Victorian OHS regulations, Queensland WHS regulations, and so on — all in one place.
WHS Penalties and Enforcement: What’s at Stake
Australian WHS legislation provides for a tiered penalty structure based on the severity of the offence. Under the Model WHS Act, there are three categories of offence:
A Category 1 offence — the most serious — involves a gross neglect of a health and safety duty, where the person is reckless as to the risk to individuals from that failure. Penalties are up to $3 million for a body corporate, $600,000 for an individual as a PCBU or officer, and $300,000 plus up to five years imprisonment for an individual as a worker.
A Category 2 offence involves a failure to comply with a health and safety duty that exposes an individual to a risk of death or serious injury or illness. Penalties are up to $1.5 million for a body corporate, $300,000 for an individual as a PCBU or officer, and $150,000 for a worker.
A Category 3 offence is a failure to comply with a health and safety duty. Penalties are up to $500,000 for a body corporate, $100,000 for an individual as a PCBU or officer, and $50,000 for a worker.
Beyond financial penalties, regulators have a range of enforcement options including improvement notices, prohibition notices, infringement notices (on-the-spot fines), and enforceable undertakings. Improvement and prohibition notices can impose significant operational disruption — a prohibition notice stopping a piece of plant or a work process can shut down production until the issue is rectified to the regulator’s satisfaction.
Regulators have also shown increasing willingness to pursue individual officers alongside corporate entities. The officer duty provisions under the Model WHS Act were specifically designed to create personal accountability at the executive level, and regulators in NSW, Queensland, and other jurisdictions have pursued prosecutions of company directors and senior managers.
Practical Steps for WHS Compliance in Your Organisation
Building and maintaining WHS compliance is not a one-time project — it is an ongoing discipline. Here is a practical framework for managing your WHS obligations effectively.
The first step is identifying the legislation that applies to your organisation. This means mapping every jurisdiction in which you operate, every industry-specific regulation that applies to your activities (construction, hazardous chemicals, mining, electrical safety, etc.), and every code of practice that your operations require you to follow. This list becomes the foundation of your compliance register.
The second step is populating your compliance register. For each piece of legislation, break it down into specific, actionable obligations. A single Act may give rise to dozens of distinct compliance obligations. Each obligation should have a clear description of what compliance looks like in practice, an assigned owner, and a review date.
The third step is linking your compliance register to your risk register. WHS compliance obligations exist because certain activities and hazards carry risk of harm. Mapping obligations to risks makes it easier to prioritise compliance gaps — a failure to comply with obligations around a high-severity risk should be treated as more urgent than a gap in lower-risk areas.
The fourth step is setting up a monitoring system for legislative change. Laws change more frequently than many compliance managers realise. A mechanism for tracking changes — whether through a legislation library tool, regulatory newsletters, or a compliance software platform — is essential for keeping your register accurate.
The fifth step is regular review and audit. Compliance registers go stale if they are not actively maintained. Build regular review cycles into your compliance management calendar — at least annually for each obligation, and more frequently for high-risk areas or following a significant incident or regulatory change.
How Lahebo Supports WHS Compliance Management
Lahebo is built specifically for Australian compliance and risk management needs. Its Compliance Register and Legislation Library modules work together to give organisations a single, authoritative view of their WHS obligations across all jurisdictions.
Within Lahebo, you can create compliance obligations linked directly to specific sections of the Work Health and Safety Act (NSW, QLD, SA, TAS, ACT, NT), the Occupational Health and Safety Act 2004 (VIC), the Work Health and Safety Act 2020 (WA), and the WHS Regulations and Codes of Practice relevant to your industry. Each obligation can be assigned to an owner, given a review date, and linked to supporting evidence.
The Legislation Library monitors changes to the legislation in your register and notifies relevant owners when updates occur. When the Queensland WHS Regulation is amended, the owners of Queensland WHS obligations in your compliance register receive an alert prompting them to review whether their obligations need updating. This replaces the need for manual regulatory monitoring and reduces the risk of compliance obligations becoming outdated.
Lahebo’s Risk Register integrates with the Compliance Register, allowing you to see at a glance which compliance gaps are associated with your highest-rated risks. This risk-based view of compliance status is exactly what Safe Work Australia recommends for effective WHS management — and it is what a regulator will look for if your organisation is subject to an audit or investigation.
For organisations taking their first step toward a structured WHS compliance register, Lahebo offers a free trial and Australian-specific onboarding support to help you map your obligations quickly and build a foundation for ongoing compliance management.
Conclusion
Australia’s OHS and WHS legislative landscape is complex but manageable when you have the right tools and a structured approach. The harmonised Model WHS Act provides a consistent framework across most jurisdictions, while Victoria’s standalone OHS Act requires specific attention for organisations with Victorian operations. Western Australia’s recent adoption of the WHS Act 2020 brought the last major jurisdiction into the harmonised fold, but with its own specific transition requirements.
The core of WHS compliance is not paperwork — it is a genuine commitment to identifying hazards, assessing risks, implementing controls, and consulting with workers. But paperwork matters too. A well-maintained compliance register, supported by a current legislation library and linked to your risk register, is the evidence base that demonstrates your commitment and protects your organisation when regulators or auditors ask the hard questions.
If you are ready to build a structured WHS compliance register for your organisation, Lahebo provides the tools to do it efficiently and keep it current as legislation evolves.