Tort Law in Australia

Introduction

Australian tort law is a hybrid of the English common law received at settlement and substantial legislative reform, particularly following the Ipp Report of 2002 (Review of the Law of Negligence). The most significant area of tortious liability is negligence, which in Australia is now governed by a unique combination of common law principles and uniform civil liability legislation enacted in every state and territory. Australia retains a robust law of intentional torts, including trespass and defamation, the latter now regulated by uniform defamation legislation across all jurisdictions.

The Duty of Care in Negligence

The concept of the duty of care in Australia originates from the neighbour principle articulated by Lord Atkin in Donoghue v Stevenson [1932] AC 562. This principle was swiftly adopted by the High Court of Australia in Grant v Australian Knitting Mills [1936] AC 85, establishing that a manufacturer owed a duty of care to an ultimate consumer. For decades, Australian courts applied the incremental approach of Anns v Merton London Borough Council [1978] AC 728, but the High Court decisively rejected that methodology in Sutherland Shire Council v Heyman (1985) 157 CLR 424, preferring a case-by-case analysis based on established categories and analogous reasoning.

The modern Australian approach to the duty of care is the salient features test, first systematically articulated in Sullivan v Moody (2001) 207 CLR 562. The High Court in that case held that the duty of care is not to be determined by a single formula but by reference to a range of factors, including the foreseeability of harm, the nature of the relationship between the parties, the degree of control exercised by the defendant, the vulnerability of the plaintiff, and the coherence of the law. The seminal formulation of the salient features approach is found in Caltex Refineries (Qld) Pty Ltd v Stavar (2009) 75 NSWLR 649, in which Allsop P listed a non-exhaustive set of factors, including the foreseeability of harm, the nature of the alleged harm, the degree and nature of control, the vulnerability of the plaintiff, the existence of any statutory scheme, and the consequences of imposing a duty for the coherence of the law.

The salient features approach has been applied in many contexts, including liability of public authorities (Graham Barclay Oysters Pty Ltd v Ryan (2002) 211 CLR 540), liability of statutory regulators for pure economic loss, and liability of professionals for negligent advice (Esanda Finance Corporation Ltd v Peat Marwick Hungerfords (1997) 188 CLR 241). The High Court has consistently emphasised in cases such as Adeels Palace Pty Ltd v Moubarak (2009) 239 CLR 420 that the salient features analysis must be conducted without recourse to policy considerations detached from legal principle.

Standard of Care and Breach

Once a duty of care is established, the question becomes whether the defendant has breached that duty. The standard of care is that of the reasonable person, an objective standard that takes no account of the idiosyncratic characteristics of the defendant. The standard may be adjusted when the defendant holds themselves out as possessing special skill (the standard of the reasonable professional) or when the defendant is a child (the standard of a reasonable child of the same age).

The test for breach in Australia was authoritatively stated by Mason J in Wyong Shire Council v Shirt (1980) 146 CLR 40. The calculus of negligence involves a two-stage inquiry: (i) whether a reasonable person in the defendant’s position would have foreseen the risk of injury (the foreseeability requirement); and (ii) whether a reasonable person would have taken precautions against that risk. The second stage involves weighing several factors: the probability of the risk materialising, the seriousness of the potential harm, the burden of taking precautions, and the social utility of the defendant’s activity.

In Wyong Shire Council v Shirt, Mason J articulated the not insignificant risk standard, holding that a risk is foreseeable so long as it is not far-fetched or fanciful. This low threshold was deliberately chosen to ensure that most negligence claims are determined at the breach stage rather than the duty stage. The calculus of negligence has since been codified in the civil liability legislation: s 5B of the Civil Liability Act 2002 (NSW) provides that a person is not negligent in failing to take precautions against a risk of harm unless the risk was foreseeable, the risk was not insignificant, and a reasonable person in the position of the person would have taken those precautions. The legislation also directs the court to consider the probability, seriousness, burden, and social utility factors derived from Wyong Shire Council v Shirt.

Causation and Scope of Liability

Australian causation law underwent a fundamental transformation with the enactment of the uniform civil liability legislation following the Ipp Report. Prior to reform, causation was determined by the common law but for test, supplemented by notions of common sense (as articulated in March v E & MH Stramare Pty Ltd (1991) 171 CLR 506). The legislation replaced this with a two-limb test.

The first limb is factual causation, defined in s 5D(1)(a) of the Civil Liability Act 2002 (NSW) as a determination of whether the negligence was a necessary condition of the harm. This is the statutory codification of the but-for test. In Adeels Palace Pty Ltd v Moubarak (2009) 239 CLR 420, the High Court confirmed that the necessary condition test is to be applied rigorously: if the plaintiff would have suffered the same harm regardless of the defendant’s negligence, factual causation is not established. The High Court in Coral v Beaumont (2014) 252 CLR 560 further held that in cases involving multiple sufficient causes, the necessary condition test must be applied with flexibility, consistent with s 5D(2), which preserves the common law approach to exceptional cases.

The second limb is scope of liability, set out in s 5D(1)(b): whether it is appropriate for the scope of the negligent person’s liability to extend to the harm so caused. This is a normative inquiry, not a factual one. In Kavanagh v Akhtar (1998) 45 NSWLR 588, the New South Wales Court of Appeal held that the scope of liability extends to the manner in which the harm manifests, even if that manifestation was not foreseeable in precise detail. The plaintiff in that case developed psychiatric illness following the combined effect of a physical injury and her husband’s reaction to it; the court held that the defendant was liable for the entire concatenation of harm because it was within the scope of the risk created by the negligence.

Defences

The civil liability reforms introduced a tiered system of defences in personal injury cases. Contributory negligence operates as a partial defence: where the plaintiff fails to take reasonable care for their own safety and that failure contributes to the harm, the court apportions responsibility and reduces damages accordingly (s 5R of the Civil Liability Act 2002 (NSW)). The standard for contributory negligence is objective: the plaintiff’s conduct is measured against that of a reasonable person in their position.

Voluntary assumption of risk is a complete defence. The defendant must prove that the plaintiff had full knowledge of the risk and freely accepted it. In Bruce v The Queen (2010) 88 NSWLR 546, the court clarified that the defence requires subjective knowledge of the specific risk, not merely constructive knowledge. The civil liability legislation has weakened this defence in certain contexts; for example, s 5F of the Civil Liability Act 2002 (NSW) provides that a person is not presumed to have voluntarily assumed a risk merely because they engaged in a dangerous recreational activity.

Dangerous recreational activities are addressed by the civil liability legislation: s 5L of the Civil Liability Act 2002 (NSW) provides that a person is not liable in negligence for harm suffered from the obvious risks of a dangerous recreational activity engaged in by the plaintiff. This defence has been applied in a range of sporting and recreational contexts, from rock climbing to horse riding.

Intentional Torts

Australian law retains a robust law of trespass. Trespass to land is actionable per se without proof of damage. The High Court in New South Wales v Ibbett (2006) 229 CLR 638 held that police officers who entered private property without lawful authority were trespassers, and the state was vicariously liable for their conduct. The court reaffirmed the fundamental common law principle that the home is a castle: every unauthorised entry onto land constitutes a trespass, regardless of the purpose.

Trespass to the person encompasses assault (the threat of imminent physical harm that creates a reasonable apprehension in the plaintiff), battery (the direct application of force without consent), and false imprisonment (total deprivation of liberty without lawful justification). These torts are actionable per se and carry exemplary damages in appropriate cases. The High Court has maintained a strict approach to directness: the trespass must be a direct, not merely consequential, interference with the plaintiff’s person or property.

Defamation

Defamation law in Australia has been harmonised by the uniform defamation legislation, now enacted in all states and territories. The serious harm requirement under the uniform legislation provides that a publication is not defamatory unless it has caused, or is likely to cause, serious harm to the plaintiff’s reputation. For corporations, the threshold is higher: only corporations with fewer than 10 employees may sue (except for not-for-profit corporations).

The uniform legislation introduced a range of defences, including the public interest defence under s 29A. The defence protects publications on matters of public interest where the defendant reasonably believed that the publication was in the public interest. This defence, modelled on section 4 of the Defamation Act 2013 (UK), has been construed broadly by Australian courts, reflecting a legislative intention to balance reputation with freedom of expression. Other defences include truth (justification), honest opinion, absolute privilege, and qualified privilege.

Nuisance and the Future of Tort Law

Private nuisance protects an occupier’s interest in the use and enjoyment of land. It requires proof of an unreasonable interference with the plaintiff’s proprietary interest, typically caused by the defendant’s ongoing activity. Public nuisance is a crime at common law and a tort where the plaintiff has suffered particular damage beyond that suffered by the public generally.

Australian tort law continues to evolve. The High Court’s approach to duty of care remains flexible and fact-dependent. The ongoing interaction between the common law and the uniform civil liability legislation raises questions of interpretation and coherence, particularly in novel areas such as liability for digital harms, automated systems, and pure psychiatric injury.

Conclusion

Australian tort law is a dynamic and layered system. The common law framework established by the High Court — particularly the salient features test for duty of care and the calculus of negligence for breach — has been overlaid by the uniform civil liability legislation, which codifies the core elements of negligence liability while preserving flexibility at the margins.