How to Challenge a Will for Mental Incapacity

Challenging a will on the basis that the person who made it lacked mental capacity is a recognised legal process in England and Wales. This type of claim, often brought in contentious probate, focuses on whether the deceased (the testator) understood the nature and effects of the will they signed. It is distinct from other grounds such as undue influence, lack of knowledge and approval, or improper execution. A successful challenge can lead to the will being declared invalid and the estate being dealt with under an earlier valid will or the intestacy rules.

This article explains the step‑by‑step process of challenging a will for mental incapacity, the evidence you may need, procedural requirements, key legal principles, and common questions for anyone considering such a claim.

What Does Mental Incapacity Mean in Will Disputes?

To challenge a will on mental incapacity grounds, you must show that the testator lacked testamentary capacity at the time the will was made or executed. Testamentary capacity has a legal meaning in English and Welsh law that differs from general everyday understanding of mental health. It is not enough that the person had a medical condition such as dementia or Alzheimer's disease; you must show that this condition affected their ability to make or understand the will.

The Banks v Goodfellow legal test - established by long‑standing common law - remains the central benchmark for determining testamentary capacity. Under this test, a person making a will must:

• Understand that they are making a will and appreciate its effects;
• Understand the nature and extent of their property;
• Comprehend the claims that they ought to give effect to (such as financial dependants or close relatives); and
• Not be suffering from any disorder of the mind or delusion that influences how they distribute their estate.

These criteria focus on the individual's mental ability at the specific time the will was made, not at other points.

Who Can Challenge a Will for Lack of Capacity?

Not everyone has automatic standing to challenge a will. Typical claimants include:

• Family members (children, spouses, siblings);
• Former beneficiaries (named in an earlier will but excluded from the current will);
• Persons financially dependent on the deceased;
• Executors or administrators who have an interest in the estate.

To challenge a will successfully, the claimant must have a legitimate legal interest and put forward evidence supporting their claim. Frustration or disappointment alone is not sufficient.

Step‑By‑Step: How to Challenge a Will for Mental Incapacity

1. Gather Relevant Evidence

Evidence is central to any challenge based on mental incapacity. You must build a factual case that the testator did not meet the Banks v Goodfellow criteria when the will was made. Relevant evidence can include:

Medical Records and Expert Assessments:
Medical history, treatment records, and cognitive assessments around the time the will was signed can support an argument that the testator did not have the required understanding. In some cases, expert witness reports from psychiatrists or geriatricians may be necessary to interpret complex medical conditions in legal terms.

Witness Statements:
Statements from family members, carers, friends, or professionals who observed the testator's behaviour and communication can be crucial. Such evidence can demonstrate confusion, inconsistency in decision‑making, or an inability to appreciate the terms of the will.

Previous Wills:
Comparing earlier wills with the disputed will can reveal unexplained or inconsistent changes that may support a capacity challenge. Significant departures from prior intentions without reasonable explanation can be persuasive when combined with other evidence.

Documentation from Will Preparation:
Files held by the solicitor or will drafter, including notes of the instructions given by the testator and any observations about their capacity at the time, may be relevant. A formal request (sometimes referred to as a Larke v Nugus request) can be made for these records.

Audio/Video Recordings:
If available, recordings of discussions when the will was executed can provide direct evidence of the testator's understanding or lack thereof.

2. File a Caveat

If probate has not yet been granted, a claimant can file a caveat with the Probate Registry. A caveat is a formal notice that prevents a Grant of Probate being issued for six months, giving time to investigate and prepare a challenge without the estate being distributed. The caveat can be extended if necessary. Filing requires completing and submitting Form PA8A to HM Courts & Tribunals Service.

3. Seek Early Legal Advice

Contesting a will is procedurally complex. Early consultation with a solicitor experienced in contentious probate is advisable. A solicitor can advise on the strength of your evidence, relevant legal grounds, and procedural steps, including pre‑action correspondence to the executors. They can also manage interactions with the Probate Registry and ensure deadlines are observed.

4. Pre‑Action Correspondence and Mediation

Often before issuing court proceedings, parties exchange pre‑action correspondence setting out the claimant's grounds for challenge and evidence. Negotiation or alternative dispute resolution (ADR) such as mediation may lead to settlement, saving time and costs.

5. Issue Court Proceedings

If no resolution is reached, the next step is to issue a claim in the High Court (Chancery Division) or the appropriate county court for a determination of validity. The claim form initiates formal litigation, during which both sides present evidence and possibly expert testimony. The claimant must show that it is more likely than not that the testator lacked capacity when making the will. Once initial evidence raises a genuine doubt about capacity, the burden may shift to the other side to demonstrate capacity.

Burden and Standard of Proof

In will disputes based on mental incapacity, the standard of proof is the balance of probabilities - meaning the claimant must show it was more likely than not that the testator lacked capacity. Initially, there is a presumption of capacity; a will that appears rational, especially if professionally drafted, will be presumed valid unless evidence suggests otherwise. If the claimant presents sufficient evidence to raise a real doubt about capacity, the burden shifts to proponents of the will (often executors or beneficiaries) to prove that the testator did have capacity.

Timing and Procedural Considerations

Unlike claims under the Inheritance (Provision for Family and Dependants) Act 1975, there is no fixed statutory time limit to challenge a will based on lack of capacity. Nonetheless, undue delay can prejudice a case and make recovery of assets difficult, particularly after estate distribution. Prompt action is advisable, and a caveat can preserve your ability to litigate.

Risks and Challenges

Challenging a will for mental incapacity is complex and evidence‑dependent. Risks include:

• Costs - Litigation and expert evidence can be expensive.
• Burden of proof - The claimant must present convincing evidence.
• Delay difficulties - Long delays after probate can weaken the case.
• Evidential challenges - Direct evidence of capacity at the time of execution is rarely available.

Legal representation with experience in contentious probate and capacity disputes improves the likelihood of navigating these challenges effectively.

Common Questions

Can a will be challenged if the testator had dementia?
Yes. A diagnosis alone does not automatically invalidate a will. The key question is whether the condition affected the testator's understanding of the will at the time it was made. Clear evidence that the testator lacked the required mental ability is necessary.

Is there a strict time limit for a capacity challenge?
There is no strict statutory deadline, but estates that have already been distributed are harder to challenge successfully, so acting promptly is in your interest. A caveat can preserve your position before probate.

Do I need a solicitor?
Challenging a will involves detailed legal procedures and strict rules about evidence and court practice. Legal advice from a solicitor experienced in contentious probate is strongly recommended.

Key Takeaways

Challenging a will for mental incapacity in England and Wales involves demonstrating that the testator lacked the necessary legal capacity when making the will. This process requires:

• Identifying and gathering robust evidence such as medical records, witness statements, and documentation from the will's preparation.
• Filing a caveat to prevent probate being granted while the dispute is prepared.
• Engaging with legal advisers to assess the strength of the claim and associated risks.
• Issuing court proceedings if no resolution is reached, presenting evidence to meet the balance of probabilities standard.

Understanding the legal framework, preparing comprehensive evidence, and acting promptly are essential to a well‑founded challenge of a will on mental incapacity grounds.