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Author: Nellie Supports Ltd
Publication Date: 15/05/2026
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Retrospective testamentary capacity and disputed wills
This guide explains retrospective testamentary capacity and disputed wills in the context of Testamentary Capacity Assessment. It is written for families, solicitors, deputies, attorneys and professionals who need clear, decision-specific information. The guide focuses on practical evidence, relevant information and the Mental Capacity Act 2005 approach, without replacing legal advice on the facts of an individual case.
Start with the precise decision
A defensible assessment begins by recording the decision in ordinary language. In this guide, the practical question is whether the person can make or change a will, or whether a statutory will application is needed because they cannot do so themselves. That question should shape the evidence gathered, the conversation with the person and the wording of any report.
Apply the Mental Capacity Act test to this decision
The Mental Capacity Act 2005 requires a structured approach. The person must be presumed to have capacity unless lack of capacity is established. They must be supported to make the decision where practicable, and an unwise decision is not enough on its own. The assessment then asks whether an impairment of, or disturbance in the functioning of, the mind or brain causes the person to be unable to make this decision.
Identify the relevant information
For this topic, relevant information commonly includes the nature and effect of making a will, the extent of the estate in broad terms, the people who might expect to benefit, the consequences of including or excluding them, and any disorder of the mind affecting the decision. The relevant information should be tailored to the person’s actual circumstances. It should not be copied from a generic template if the person’s options, risks or legal context are different.
Gather evidence before drawing conclusions
The assessment is stronger when the evidence is organised before the conclusion is reached. Useful evidence may include draft wills, previous wills, estate information, solicitor notes, medical records, family background, instructions, and evidence relevant to vulnerability, pressure or dispute. Where records are missing, contradictory or out of date, the report should say so rather than overstate the certainty of the opinion.
Record practicable steps and communication support
The person should be given a meaningful opportunity to make the decision. This may involve simple language, written summaries, visual aids, additional time, breaks, support with hearing or sight, an interpreter, a familiar setting or a carefully timed appointment. The report should explain what support was tried and whether it helped.
Analyse use and weigh, not just understanding
Many capacity disputes turn on whether the person can use or weigh information, not whether they can repeat it. The assessor should consider how the person reasons through benefits, risks, alternatives and consequences. For testamentary Capacity Assessment, this means looking at the person’s own explanation and whether any impairment prevents them from weighing the material information.
Consider risk, pressure and vulnerability carefully
Risk features should be recorded without turning them into shortcuts. Common issues in this area include failing to consider Banks v Goodfellow, treating property and affairs capacity as the same as testamentary capacity, overlooking suspicious circumstances, or relying on a brief note rather than reasoned evidence. The assessor should distinguish vulnerability, disagreement, family conflict and safeguarding concerns from evidence that the person is unable to make the decision.
What a strong report should contain
A strong report should include the instruction, the specific decision, the legal framework, the relevant information, evidence reviewed, practicable steps, direct assessment findings, functional analysis, causation and a clear conclusion. It should also explain any limitations, such as missing evidence, refusal to engage, fluctuating presentation or the need for further legal advice.
Key takeaway
Testamentary capacity has its own legal framework. It should be considered carefully where a will is disputed, changed late in life or made in circumstances of vulnerability. The safest approach is disciplined and evidence-led: define the decision, tailor the relevant information, support the person, apply the functional test and explain the reasoning clearly.
Frequently asked questions
Does a diagnosis automatically mean someone lacks capacity?
No. A diagnosis may explain why capacity is in doubt, but it does not answer the legal question. The assessment must still consider the specific decision, the relevant information, the support provided and whether the person can understand, retain, use or weigh that information and communicate a decision.
What evidence is useful for Testamentary Capacity Assessment?
Useful evidence will depend on the facts, but it commonly includes draft wills, previous wills, estate information, solicitor notes, medical records, family background, instructions, and evidence relevant to vulnerability, pressure or dispute. The assessor should record which documents were reviewed and separate direct observations from information supplied by others.
When is a formal assessment for Testamentary Capacity Assessment useful?
A formal report is usually useful where the decision is important, disputed, high-value, court-related, professionally scrutinised or affected by concerns about pressure, fluctuating capacity, communication needs or safeguarding risk.
Related mental capacity assessment pages
These internal links help readers move from this guide to the most relevant Nellie Supports service page, assessment option or legal framework page.
Need help with Testamentary Capacity Assessment?
Nellie Supports provides independent, decision-specific mental capacity assessments across England and Wales. If this guide relates to a live decision, dispute, Court of Protection matter or professional instruction, the next step is to review the relevant service page for Testamentary Capacity Assessment or the main Mental Capacity Assessments hub.