What Is Testamentary Capacity in Victoria?

What Does Testamentary Capacity Mean?

Testamentary capacity is the mental ability required to make a valid Will. It is a legal concept, not a medical one — a person can have a serious medical diagnosis and still satisfy the legal test, while a person without any diagnosis may, in some circumstances, lack it.

The concept comes from the inherent need for a Will to reflect the genuine, considered intentions of the Will-maker (also called the testator). A document that does not reflect those intentions — because the maker did not understand what they were doing or could not weigh the relevant considerations — should not be allowed to govern who receives a deceased person's property.

Capacity is also decision-specific. A person who lacks capacity to manage complex financial affairs may still have capacity to make a simple Will, and the reverse can also be true. The question is always: did the Will-maker have the specific capacity required to make this Will, at the time this Will was signed?

The Legal Test for Testamentary Capacity

The classic test in Australian law derives from the English case of Banks v Goodfellow (1870), which continues to be applied by the Supreme Court of Victoria today. In plain language, a person has testamentary capacity if, at the time of signing the Will, they:

• Understand the nature and effect of a Will — that they are giving directions about who is to receive their property after they die, and that the document will operate on their death.
• Understand, in general terms, the extent of their property — they do not need to know exact balances, but they should appreciate the broad nature and value of what they own.
• Understand who might reasonably expect to benefit — a spouse, children, dependants and others who might have a moral or legal claim on their estate.
• Be free from any delusion or disorder of the mind that distorts their judgment or causes them to make decisions they would not otherwise make.

None of these requirements demand perfect memory, perfect recall of every asset, or detailed legal knowledge. The threshold is one of broad, functional understanding. A Will-maker can forget the precise value of their superannuation, or struggle with names, and still satisfy the test — provided the four core requirements are met.

Why Testamentary Capacity Matters

Testamentary capacity matters because it determines whether a Will is legally valid. A Will signed by a person without capacity is liable to be set aside if challenged in the Supreme Court of Victoria.

For Will-makers, capacity matters because their wishes — recorded carefully in a Will — may not be honoured if a Court later finds that they lacked capacity. For families, it matters because a successful capacity challenge can radically change the distribution of an estate. And for executors, capacity matters because they may be drawn into litigation defending a Will whose validity is in question.

The practical consequences are significant. If a Will is invalidated for lack of capacity, the estate will be distributed under the previous valid Will (if any) or under Victoria's intestacy rules — which may produce a very different outcome to the one the Will-maker intended. This is why Wills and estate planning in Victoria is approached carefully, particularly where age or health considerations are present.

When Is Capacity Most Often Questioned?

Capacity can be raised in any estate, but it is more often questioned where one or more of the following features are present:

• Age and cognitive decline — the Will-maker was elderly, frail or showing signs of memory loss when the Will was prepared.
• A medical diagnosis — dementia, Alzheimer's disease, stroke, brain injury or another condition known to affect cognition.
• Significant or last-minute changes — a new Will that materially departs from a long-standing estate plan, particularly close to death.
• Involvement of a benefiting party — one beneficiary was unusually involved in arranging the Will, attending appointments, or instructing the solicitor.
• Isolation — the Will-maker had become isolated from other family members or trusted advisers before signing.
• Unusual provisions — long-standing beneficiaries (such as children) were excluded, or relatively distant individuals received unusually significant gifts.

None of these features alone proves a lack of capacity. They are simply common factual settings in which capacity is more likely to be examined.

Dementia and Testamentary Capacity

Dementia is the medical context most commonly associated with capacity disputes. It is also the area in which the distinction between medical diagnosis and legal capacity becomes most important.

A diagnosis of dementia does not automatically deprive a person of testamentary capacity. Many people in the earlier stages of dementia continue to understand the nature of a Will, their assets and their family relationships, and can give clear and considered instructions. Others — particularly in more advanced stages — may not. Capacity can also fluctuate significantly from day to day, and even within a single day, with "good" and "bad" periods.

Because capacity is assessed at the moment the Will is signed, careful timing and detailed solicitor file notes are critical when a Will is prepared for a person with dementia. For a fuller discussion, see our article on whether a person with dementia can make a valid Will in Victoria.

Medical Evidence and Capacity Assessments

Medical evidence often plays an important role both in preparing a Will and in any later capacity dispute. Where there is any real doubt about a Will-maker's capacity, a prudent solicitor will follow what is sometimes called the "Golden Rule" — obtaining a contemporaneous medical opinion, ideally from the person's GP or a treating specialist, before the Will is signed.

A contemporaneous medical report records what the assessing practitioner observed at or near the time of the Will. Such records are usually far more persuasive than opinions formed years later, after death. The solicitor's own file notes — recording the questions asked, the answers given, and observations about the Will-maker's demeanour — also carry significant weight.

In contested matters, medical records, hospital notes, specialist reports and neuropsychological assessments may all be reviewed. Expert witnesses are often retained to interpret the evidence. The role of those experts is to help the Court understand the medical material; the ultimate question — whether the legal test was met — is for the Court. For more, see our article on medical evidence in testamentary capacity disputes.

Challenging a Will on Capacity Grounds

A Will can be challenged in the Supreme Court of Victoria on the basis that the Will-maker lacked testamentary capacity at the time it was signed. Once capacity is genuinely raised, the burden generally falls on the party seeking to uphold the Will (often the executor) to establish that the Will-maker had capacity.

Capacity challenges commonly turn on a combination of:

• Medical evidence — GP records, hospital notes, specialist reports and any contemporaneous capacity assessments.
• The solicitor's file — file notes, draft instructions and correspondence recording how the Will was prepared.
• Witness evidence — accounts from family members, friends, carers and others who interacted with the Will-maker around the relevant time.
• The Will itself — whether its terms are rational, internally consistent and consistent with long-standing intentions.

For a more detailed treatment, see our article on challenging testamentary capacity in Victoria.

Capacity and Undue Influence

Lack of capacity and undue influence are distinct legal concepts, but they frequently arise together. A Will-maker may have technical capacity yet still be unduly influenced by another person — pressure so significant that it overbears their free will. Conversely, a person with reduced capacity may be more vulnerable to influence.

Many estate disputes plead both grounds in the alternative. For a comparison of the two concepts, see our article on undue influence and testamentary capacity, and the related article on undue influence and suspicious circumstances in Victorian estate disputes.

Practical Takeaways

• Testamentary capacity is a legal test, not a medical one — diagnosis alone does not determine the outcome.
• The Banks v Goodfellow requirements remain the foundation of the Victorian test.
• Capacity is assessed at the time the Will is signed and can fluctuate.
• Contemporaneous medical evidence and detailed solicitor file notes are the most powerful protections against later disputes.
• Where capacity is doubtful, early legal advice — and a careful, considered process — is almost always the safest path.

How Parke Lawyers Can Help

Parke Lawyers advises Will-makers, families, executors and beneficiaries on testamentary capacity issues in Victoria. Whether you are preparing a Will for someone whose capacity may be questioned, or you are concerned about a Will that has already been signed, early advice helps protect intentions and reduce the risk of a contested estate.

Frequently Asked Questions