Testamentary Capacity refers to a person’s mental ability to make or amend a valid Lasting Will and Testament. This means the individual, known as the Testator, must clearly understand what they are doing when drafting their Will. This legality ensures the final wishes in a Will genuinely reflect the Testator’s intentions.
If a Testator lacks the mental capacity to make a Will at the time they come to sign it, the Will becomes legally invalid. Such situations often lead to disputes among family members and beneficiaries, sometimes resulting in prolonged and emotionally difficult court battles.
The Legal Test for Testamentary Capacity
The legal standard for Testamentary Capacity originates from the case Banks v Goodfellow (1890). This case set out a four-part test, which remains the benchmark today.
To have Testamentary Capacity, a person must:
- Understand they are making a Will and what this action entails
- Know the general nature and value of their assets
- Recognise the people who might reasonably expect to benefit from their estate
- Be free from any mental illness or delusion that influences their decision-making
This test ensures that the Testator is making informed and voluntary decisions. Importantly, the law considers the Testator’s mental state at the time they made their Will. Temporary confusion or memory lapses do not automatically invalidate a Will if the Testator had adequate understanding when signing it.
Case Law vs The Mental Capacity Act
The Mental Capacity Act 2005 introduced a broader legal framework for assessing capacity in areas such as financial and medical decisions. Initially, there was uncertainty over whether the Act replaced the Banks v Goodfellow test.
However, the two approaches differ from each other:
- The Mental Capacity Act 2005 assumes a person has capacity unless it is proven otherwise
- It also demands an understanding of all relevant information and likely consequences
In contrast, Banks v Goodfellow sets a more focused and flexible threshold. It does not require the Testator to grasp every outcome but simply to understand the purpose of the Will and who might have a moral claim on their estate.
This distinction was clarified in Walker v Badmin (2015) , where the court confirmed that Banks v Goodfellow remains the sole legal test for Testamentary Capacity. Parliament never intended the Mental Capacity Act 2005 to apply to Will-making, reinforcing the traditional legal standard.
The Rise in Capacity-Related Challenges
As life expectancy increases and more people make Wills later in life, legal challenges related to capacity are on the rise. Conditions such as dementia become more common with age, increasing the likelihood of a Testator’s mental capacity being questioned.
According to NHS data, hundreds of thousands of people in England live with dementia, and that figure continues to grow. At the same time, families have become more complex, with second marriages and rising property values. These dynamics have made disputes over inheritance more frequent and contentious.
Assessing Testamentary Capacity in Practice
The threshold for Testamentary Capacity is purposefully low. People do not need to full understand legal terminology or list every asset they own. They simply need to:
- Understand the basic purpose of a Will
- Be aware of what they own in broad terms
- Recognise who might reasonably expect to benefit
A Testator with early-stage dementia or poor memory may still have capacity if they can comprehend these essentials. Courts are not looking for perfection; they are seeking evidence that the Testator was able to make clear, conscious decisions.
Proving Testamentary Capacity
When someone challenges a Will, they need evidence to confirm whether the Testator had the required capacity. The following types of evidence are common:
- Notes from the solicitor who drafted the Will
- Medical reports from around the time of the Will’s creation
- Statements from witnesses present during the Will’s execution
Judges often place strong emphasis on the opinion of experienced solicitors. In cases such as Hawes v Burgess (2013) and James v James (2018), the courts preferred the solicitor’s evidence over retrospective medical opinions. Even when procedures were not perfectly followed, the solicitor’s view that the Testator had capacity was given significant weight.
This underscores the value of involving a professional and ensuring proper documentation during the Will-making process.
Red Flags and Risk Factors
While not definitive on their own, certain signs may raise concerns about the validity of a Will. These include:
- Sudden or drastic changes to previous Wills
- Exclusion of close relatives without a clear explanation
- Unusual language, formatting or spelling errors
- Involvement or influence of a beneficiary in drafting the Will
These factors can support claims related to lack of knowledge, approval or undue influence. Although they do not automatically render a Will invalid, they do warrant further scrutiny.
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This article is for general informational purposes only and does not constitute legal or financial advice. While we aim to keep our content up to date and accurate, UK laws and regulations are subject to change. Please speak to a professional for advice tailored to your individual circumstances. Will Guardian accepts no responsibility for any issues arising from reliance on the information provided.