Mental Capacity Assessment Power of Attorney NSW

Capacity Is Assessed at the Moment of Signing

A diagnosis of early-stage dementia, mild cognitive impairment, or a neurological condition does not automatically prevent someone from making a valid enduring power of attorney in New South Wales. The law presumes capacity until proven otherwise, and the test is applied at the precise moment the person signs — not when the diagnosis was made, not when symptoms first appeared, and not based on their general cognitive trajectory.

The legal test asks three questions: Does the person understand that they are giving someone else authority over their financial affairs? Do they understand the scope of that authority? Do they understand that they can revoke the document while they still have capacity?

If the answer to all three is yes at the moment of execution, the EPOA is valid — regardless of what the person's cognitive function looks like a week later or a year later.

Who Performs the Assessment

Capacity assessments for the purpose of executing an EPOA are typically performed by the principal's GP or a relevant specialist (geriatrician, neuropsychologist, psychiatrist).

The assessment should occur on the same day the EPOA is signed. A certificate issued a week before signing, or retroactively a week after, carries less weight if the document is later challenged. The contemporaneous nature of the assessment is the critical factor.

The assessing practitioner should document:

• That they examined the patient on the specific date of signing
• The clinical basis for their assessment (cognitive tests administered, clinical observations)
• Their conclusion about whether the patient met the three-part capacity threshold
• Any relevant diagnoses or conditions that inform the assessment

There is no prescribed form for the capacity certificate in NSW. A letter on the practitioner's letterhead, with the date of assessment and a clear statement of the findings, is sufficient.

Fluctuating Capacity

Dementia and other cognitive conditions frequently involve periods of lucidity alternating with periods of confusion. A person may be sharp in the morning and disoriented by afternoon, or clear-headed for days and then confused for a week.

NSW law accommodates this. The question is not whether the person has good days and bad days — it is whether they had capacity at the specific moment they signed the EPOA. If the signing is scheduled during a period of lucidity, and the GP certifies capacity at that moment, the EPOA is valid.

Practical steps for fluctuating capacity situations:

• Schedule the signing for the person's best time of day. If they are most alert in the morning, arrange a morning appointment.
• Have the GP present at the signing. The GP can assess capacity immediately before the person signs, in the same room, and then certify on the spot. This eliminates any gap between assessment and execution.
• Keep the process short and simple. A lengthy, complex signing session increases cognitive fatigue and the risk that the person's capacity will dip during the appointment.
• Document everything. Notes from the GP, observations from the prescribed witness, and if possible, a brief video recording of the person confirming their understanding of the document.

Protecting Against Future Challenges

The most common reason an EPOA is challenged is a claim that the principal did not have capacity when they signed it. This challenge can come years after the EPOA was made — typically from a family member who was not involved in the process and who objects to the attorney's appointment or actions.

A robust capacity assessment at the time of signing makes this challenge extremely difficult to sustain. Without it, the challenger only needs to produce evidence of cognitive decline around the time of signing to create doubt.

The capacity certificate. A detailed, contemporaneous certificate from the GP or specialist is the single strongest piece of evidence. It should not be a one-line letter saying "this patient has capacity." It should describe the assessment methodology, note the specific questions asked, and explain the clinical reasoning behind the conclusion.

The prescribed witness certificate. The prescribed witness (solicitor, Local Court registrar, or NSW Trustee & Guardian employee) is required to certify that the principal appeared to understand the document and that it was explained to them. A witness who takes this obligation seriously — who asks the principal to explain back what the document does in their own words — creates a second layer of contemporaneous evidence.

Independent witnesses. If other people were present at the signing — a social worker, a second family member, a nurse — their observations can support the capacity finding. Ask them to note the date, time, and their impression of the principal's understanding.

Exclude interested parties from the room. If the appointed attorney is present during the capacity assessment and the signing, a future challenger can argue that the principal was influenced by their presence. Having the attorney wait outside during the assessment removes this avenue of attack.

When Capacity Has Been Lost

If the GP determines that the person no longer meets the capacity threshold — they cannot understand what the EPOA means or the scope of authority they are granting — the EPOA cannot be made. There is no exception to this rule.

At that point, the only pathway to authorised financial management is an application to NCAT for a financial management order. The tribunal will appoint a private financial manager or NSW Trustee & Guardian, depending on the circumstances.

This is why timing matters. The capacity window is finite and unpredictable. Families who wait until cognitive decline is obvious may find the window has already closed.

The New South Wales Power of Attorney Kit includes capacity assessment preparation guides, questions to discuss with the GP before the appointment, and execution protocols designed to create the strongest possible defence against future challenges.

See more New South Wales guides →