The High Court’s Landmark Decision in AA v Trustees of the Roman Catholic Church for the Diocese of Maitland-Newcastle

Case Summary

In AA v Trustees of the Roman Catholic Church for the Diocese of Maitland-Newcastle [2026] HCA 2, the High Court heard an appeal concerning historical child sexual abuse by a Catholic priest. AA, the plaintiff, was sexually abused as a child parishioner by a priest who was acting as a representative of the Diocese. The abuse occurred in circumstances where the priest had established a relationship of trust with AA through his role within the church.

The central legal question was whether the Diocese could be held liable for the priest’s intentional criminal acts through the doctrine of non-delegable duty. The Court found in favour of AA, ruling that the Diocese owed him a non-delegable duty of care and breached that duty when the priest abused him. Significantly, this decision overturned the precedent established in New South Wales v Lepore (2003) 212 CLR 511, which had previously held that non-delegable duties could not be breached by intentional criminal acts.

What is a Non-Delegable Duty of Care?

A non-delegable duty of care is a special category of legal duty where a person or organisation cannot escape liability simply by delegating tasks to someone else, even if that person is competent and acts independently. Unlike ordinary duties of care—where liability depends on proving personal fault—a non-delegable duty makes the duty-holder responsible for ensuring that reasonable care is actually taken, regardless of who carries out the work.

Who Does It Apply To?

Non-delegable duties typically arise in relationships involving particular vulnerability or where one party has assumed special responsibility for another’s safety. Common examples include:

• Schools and students: Schools owe students a non-delegable duty to ensure reasonable care is taken for their safety during school activities, including on excursions or when under the supervision of teachers or coaches.
• Hospitals and patients: Hospitals have a non-delegable duty to ensure that reasonable care is taken in the treatment of patients, even when treatment is provided by independent contractors or visiting medical practitioners.
• Employers in hazardous workplaces: In certain circumstances involving inherently dangerous work, employers may owe workers a non-delegable duty to ensure safe systems of work are maintained.
• Custodial institutions: Organisations standing in loco parentis (in place of parents), such as detention centres or residential care facilities, owe children and vulnerable persons in their care a non-delegable duty to protect them from foreseeable harm.

The key element is that the duty-holder has undertaken responsibility for the care, supervision, or control of a vulnerable person or their property, creating a special relationship that gives rise to this heightened duty.

What is Vicarious Liability?

Vicarious liability is a separate legal doctrine that makes one party (typically an employer) legally responsible for the wrongful acts of another person (typically an employee), even though the first party did not personally commit the wrong and may not have been at fault. This liability arises from the relationship between the wrongdoer and the party being held liable.

Key Examples of Vicarious Liability

• Employer-employee relationships: An employer may be vicariously liable when an employee negligently injures someone while performing work duties, such as a delivery driver causing an accident during deliveries.
• Principal-agent relationships: A business may be liable for wrongful acts committed by its agents acting within the scope of their authority.
• Intentional wrongdoing in employment contexts: In certain circumstances, employers can be vicariously liable even for intentional wrongful acts by employees, provided there is a sufficient connection between the employment relationship and the wrongdoing.

The critical distinction is that vicarious liability focuses on the relationship between the duty-holder and the wrongdoer, whereas non-delegable duty focuses on the relationship between the duty-holder and the injured party.

Key Findings in AA v Trustees of the Roman Catholic Church

The High Court ruled that the Diocese owed AA, a child parishioner, a non-delegable duty of care that required the Diocese to ensure reasonable care was taken to prevent foreseeable harm, including harm caused by intentional criminal acts of its delegate, the priest. The Court found the Diocese breached this duty when the priest sexually abused AA, as the abuse occurred within the scope of the priest’s purported performance of his role as a representative of the Diocese.

The Court justified overturning Lepore by applying principles established in John v Federal Commissioner of Taxation (1989) 166 CLR 417. The majority found that Lepore’s reasoning was doctrinally inconsistent, failed to provide a clear framework for liability, and led to unjust outcomes. The Court emphasized that non-delegable duties and vicarious liability are distinct legal concepts with different focuses and requirements.

When Does a Non-Delegable Duty Exist in Relation to Intentional Criminal Acts?

A non-delegable duty of care can exist in relation to intentional criminal acts when the duty-holder has undertaken the care, supervision, or control of a vulnerable person, and the harm arises from actions of the duty-holder’s delegate. In AA, the High Court emphasized that the Diocese had assumed responsibility for the care of child parishioners, creating a special duty to ensure reasonable care was taken to prevent foreseeable harm.

The Court clarified that this duty extends to harm caused by intentional criminal acts committed by the duty-holder’s delegate, provided the harm arises within the scope of the delegate’s purported performance of their role. The priest’s position as a representative of the Diocese enabled him to establish the relationship of trust that ultimately led to the abuse.

When Does a Non-Delegable Duty Exist in Relation to Intentional Criminal Acts by Third Parties?

The High Court also addressed the scope of non-delegable duties in cases involving harm caused by third parties. The judgment clarified that a non-delegable duty may extend to harm caused by third parties if the duty-holder has assumed responsibility for the care, supervision, or control of the injured party and failed to ensure reasonable care was taken to prevent foreseeable harm.

For example, in Willmot v Queensland (2024) 419 ALR 623, the High Court recognized that the State, standing in loco parentis to the plaintiff, had a non-delegable duty to ensure her safety. The Court emphasized that the State’s authority over the plaintiff was broader and deeper than that of a school or hospital, and its duty included ensuring protection from abuse by third parties.

Distinction Between Non-Delegable Duty and Vicarious Liability

The High Court in AA explicitly distinguished non-delegable duties from vicarious liability. While both concepts can result in liability for harm caused by another person, their legal foundations differ:

Vicarious Liability focuses on the relationship between the duty-holder and the wrongdoer. It requires an employment or analogous relationship between the two parties. In AA, the High Court noted that vicarious liability was not applicable because the priest was not an employee of the Diocese.

Non-Delegable Duty focuses on the relationship between the injured party and the duty-holder. It arises when the duty-holder has undertaken the care, supervision, or control of the injured party, creating a special responsibility to ensure their safety. In AA, the Diocese’s relationship with AA as a vulnerable child parishioner created this duty.

Overlap Between Non-Delegable Duty and Vicarious Liability

While the High Court emphasized the distinction between these two concepts, it acknowledged they may overlap in certain circumstances. For instance, where an employment relationship exists between the duty-holder and the wrongdoer, both vicarious liability and a non-delegable duty may apply. However, the Court clarified that non-delegable duties are not dependent on an employment relationship and can exist independently.

Conclusion

The High Court’s decision in AA v Trustees of the Roman Catholic Church represents a significant development in the law of negligence, particularly in cases involving intentional criminal acts. By overturning Lepore, the Court has expanded the scope of non-delegable duties to include harm caused by intentional acts of delegates and third parties, provided the duty-holder has assumed responsibility for the injured party’s care and the harm arises within the scope of that responsibility.

This decision underscores the importance of the relationship between the duty-holder and the injured party in determining liability under a non-delegable duty, while maintaining a clear distinction from vicarious liability, which focuses on the relationship between the duty-holder and the wrongdoer. This ruling will likely have far-reaching implications for cases involving historical sexual abuse and other intentional harms, particularly in contexts where vulnerable individuals are under the care or supervision of institutions or individuals.​​​​​​​​​​​​​​​​