When an employer makes a decision that affects a worker — a dismissal, a demotion, a shift reduction, a change in duties — that decision is generally lawful as long as it is made for legitimate, business-based reasons. But when that decision is connected to a worker exercising a legal right or engaging in lawful industrial activity, the law treats the situation very differently. The Fair Work Act 2009 (Cth) contains a set of protections known as the general protections, and contravening them by taking "adverse action" can expose a business to uncapped compensation, civil penalties, and orders for reinstatement.
This article explains what adverse action actually means, how the key elements of a claim work, the critical difference between adverse action and unfair dismissal, where employers and employees most commonly go wrong, and when to get legal help.
What counts as adverse action
The starting point is s 342 of the Fair Work Act 2009 (Cth), which sets out what "adverse action" means. In an employment context, adverse action by an employer includes:
- dismissing an employee
- injuring the employee in their employment (for example, cutting pay, reducing hours, or demoting them)
- altering the employee's position to their detriment (such as removing responsibilities or unfavourably relocating them)
- discriminating between employees
Adverse action also covers prospective employees — so refusing to hire a candidate because of a prohibited reason falls within the same framework. Importantly, the protections extend to threats to take adverse action and to organising others to do so. The Act also covers independent contractors in certain circumstances.
The definition is deliberately broad. It is not limited to dramatic outcomes like termination. A single removed shift, a withdrawn promotion, or a revised reporting line can each qualify if the other elements of a claim are made out.
The prohibited reasons: what "workplace rights" actually means
Adverse action is only unlawful if it is taken because of a prohibited reason. Section 340 of the Fair Work Act 2009 (Cth) prohibits adverse action taken because a person has, exercises, or proposes to exercise a workplace right.
A workplace right includes:
- being entitled to a benefit under a workplace law or instrument (an award, an enterprise agreement, or the National Employment Standards)
- making a complaint or inquiry about employment — for example, raising a pay concern, a safety issue, or a question about rostering
- starting or participating in proceedings under a workplace law
Beyond workplace rights, the protections also cover:
- Lawful industrial activity — such as joining a union, participating in lawful industrial action, or holding a role as a union representative
- Temporary absence from work due to illness or injury — a worker cannot be dismissed because they are temporarily unwell
- Protected attributes — including race, sex, age, disability, pregnancy, family or carer's responsibilities, and a range of other grounds that overlap with anti-discrimination law
The critical question in any claim is not whether the employer had a legitimate reason for the decision, but whether a prohibited reason was also a factor — even a partial one — in the decision.
The reverse onus: why documentation matters so much
One feature of general protections law that surprises many employers is the way the burden of proof works. Under s 361 of the Fair Work Act 2009 (Cth), once an employee alleges that adverse action was taken for a prohibited reason, it is presumed that the action was taken for that reason — unless the employer proves otherwise.
This "reverse onus" shifts the burden to the employer to demonstrate that the prohibited reason played no part in the decision. Standard civil litigation runs the other way: the person making a claim must prove it. In general protections cases, the employer is effectively put to proof.
The practical consequence is significant. If a manager reduces a worker's hours two weeks after that worker raised a pay query, the timing alone may be enough to trigger the presumption. The employer then needs to show — through documented, contemporaneous evidence — that the hours reduction was for entirely separate, business-based reasons. Without that documentation, the defence is very difficult to run.
Adverse action compared to unfair dismissal
Many employers and employees encounter both of these concepts at once, and the two regimes are sometimes confused. They are distinct.
Unfair dismissal asks whether a dismissal was "harsh, unjust or unreasonable" having regard to a set of factors including whether there was a valid reason for dismissal and whether proper process was followed. Compensation under the unfair dismissal jurisdiction is capped — the Fair Work Commission sets the cap at half the high-income threshold, which for 2025–26 is $91,550.
Adverse action (general protections) asks a different question: was a prohibited reason a factor in the action taken? The remedies here include compensation that is uncapped — courts may order compensation for economic loss and for non-economic loss including hurt, humiliation, and distress. Civil penalties can be ordered against both companies and individuals. Reinstatement and injunctions are also available.
There are also differences in who can bring each type of claim. Unfair dismissal is generally limited to employees who have completed the minimum employment period and who earn below the high-income threshold (unless covered by an award or enterprise agreement). General protections claims cover a broader group, including prospective employees and, in some circumstances, independent contractors.
Both regimes impose a 21-day time limit for dismissal-related applications. For general protections, the application must be lodged with the Fair Work Commission within 21 days of the dismissal taking effect. Extensions are granted only in limited circumstances.
Where employers typically go wrong
Adverse action claims most often arise not from deliberate retaliation, but from poor timing, inadequate documentation, and management decisions made without awareness of the protections framework. Common patterns include:
- Acting too soon after a protected event. A manager issues a formal warning, reduces hours, or restructures a role shortly after an employee makes a complaint or takes sick leave. The timing creates a connection that is difficult to rebut without clear evidence that the decision was already in progress for unrelated reasons.
- Inconsistent treatment. Applying disciplinary action, redundancy criteria, or roster changes differently to employees who have exercised a workplace right compared to those who have not.
- Undocumented decisions. Taking action based on genuine business reasons but failing to record those reasons at the time. When the matter reaches conciliation or court, reconstructing the decision-making process from memory rarely works.
- Confusing protected conduct with misconduct. An employee who raises a pay complaint through internal processes is exercising a workplace right. Treating that complaint as insubordination, or using it as a reason to scrutinise the employee more closely, can create liability.
- Assuming probation offers protection. General protections apply from the first day of employment, not from the end of the minimum employment period. An employer who dismisses a probationary employee partly because that employee raised a workplace concern may still face a general protections claim, even though the employee has no unfair dismissal rights.
How Artificer Legal can help
Whether you are an employer trying to reduce exposure or an employee who believes action was taken against you for a prohibited reason, the analysis is fact-specific and time-sensitive.
For employers, a legal practitioner will typically:
- Review the decision-making process and identify whether any element of the action is connected to a workplace right or protected attribute
- Assess the documentation available to support the reverse onus defence
- Advise on process corrections — such as ensuring a show cause process is followed before a decision is made — and help draft the necessary records
- Respond to a Fair Work Commission conciliation application, including preparing a considered position statement
- Advise on settlement or, if the matter proceeds to court, assist with the litigation strategy
For employees, the first priority is usually establishing whether the timeline supports an adverse action claim, preserving evidence, and lodging within the 21-day window if the matter involves a dismissal.
At Artificer Legal, we advise Australian businesses and their people on employment law, including general protections, workplace investigations, and compliant performance management processes. We can help you assess your exposure before a claim is made, or advise you on your options if one has already arrived.
Putting it together
Adverse action under Australian law is broader and more complex than most employers realise until they face a claim. A decision does not need to be vindictive or discriminatory in the ordinary sense — it only needs to have been influenced, even partially, by a protected reason. The reverse onus means that good intentions are not enough on their own; documented, contemporaneous reasoning is what matters.
Key points to carry forward:
- Adverse action is defined in s 342 of the Fair Work Act 2009 (Cth) and includes dismissal, demotion, reduced hours, changed duties, and discrimination — as well as threats to do any of these things
- The protections are triggered by workplace rights (entitlements, complaints, proceedings), lawful industrial activity, temporary illness absence, and a range of protected attributes
- Under s 361, once adverse action is alleged, the employer bears the burden of disproving the prohibited reason
- General protections compensation is uncapped and includes non-economic loss; civil penalties can be imposed on individuals as well as companies
- Both adverse action and unfair dismissal applications involving dismissal must be lodged within 21 days of the dismissal taking effect
- General protections apply from day one of employment, including during probation