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Can Testamentary Capacity Be Challenged in a Will?
Last Updated on October 20, 2025 by tanya
Can Testamentary Capacity Be Challenged in a Will?
Contentious Probate Disputes
Testamentary capacity plays a pivotal role in determining whether a will stands the test of time, so can testamentary capacity be challenged in a will? The short answer is yes as testamentary capacity can look at factors such as age, whether the testator had mental illness or was on medication. It can also consider evidence of manipulation or undue influence and even possible forgery or fraud.
Challenging a will falls under contentious probate law and testamentary capacity is one of the more common reasons the validity of a will comes under question.
So, if you are dealing with a loved one’s estate and have some red flags, we work with lawyers who specialise on content probate, who can advise you on your next steps.
What Is Testamentary Capacity?
Testamentary capacity refers to a person’s legal and mental ability to make or change a valid will. According to law, specifically the Mental Capacity Act 2005, an individual making a will must understand:
The nature of making a will
The extent of their assets
Who may have a claim to their estate
The impact of their decisions
If a person cannot meet these criteria, their will can be contested. Challenges typically arise due to mental illness, dementia, or influence from third parties.
Can Testamentary Capacity Be Challenged?
Yes. Testamentary capacity can be challenged, normally under contentious probate proceedings. Family members, beneficiaries, or interested parties may dispute a will if they believe the testator lacked capacity when signing it. Challenges often hinge on the Banks v Goodfellow test, which remains the cornerstone of UK law on testamentary capacity.
The test requires the testator to:
Clearly understand the nature and effect of making a will
Understand the extent of the property they are distributing
Comprehend the claims to which they ought to give effect
Be free from mental disorder or delusions that affect their decisions
Courts examine medical evidence, witness statements, and prior behaviours to determine whether these conditions were met.
What Is Contentious Probate?
Contentious probate occurs when a will is disputed after the death of the testator. It is one of the most common sources of family conflict and which may lead to lengthy and costly legal proceedings.
The main grounds for contentious probate claims include:
Lack of testamentary capacity
Challenging testamentary capacity is the most frequent reason for disputes. Courts look carefully at medical records, solicitor notes, and testimony from anyone who interacted with the testator near the time the will was made.
Red Flags Affecting Testamentary Capacity
Certain situations can signal that a testator’s capacity may be compromised. Recognising these red flags early can prevent disputes or help prepare a robust defence. Key red flags include:
1. Sudden Changes in the Will
If a new will significantly alters inheritance, particularly in favour of someone unexpected, this may raise suspicion. Courts scrutinise whether the testator fully understood their actions or was under undue influence.
2. Evidence of Mental Illness or Cognitive Decline
Dementia, Alzheimer’s, or other mental illnesses can affect decision-making. Medical records, care home notes, or GP assessments may be used as evidence of incapacity.
3. Influence from Third Parties
Pressure from family members, caregivers, or advisors can invalidate a will. If a person is coerced, intimidated, or manipulated, their testamentary decisions may be legally challenged.
4. Inconsistent or Confusing Wills
Multiple, conflicting wills created in a short timeframe can suggest uncertainty or lack of understanding. Courts will examine whether the testator had clear intent and comprehension.
5. Lack of Legal Advice or Independent Witnesses
Failing to obtain legal advice or lacking independent witnesses can be a red flag. Solicitors play a key role in ensuring the testator understands the will and has capacity, strengthening the validity of the document.
How Are Challenges to Testamentary Capacity Resolved?
When testamentary capacity is disputed, courts undertake a detailed review to determine if the will is valid. Key steps generally include:
Gathering Evidence: Medical records, solicitor notes, and witness testimonies provide insight into the testator’s mental state.
Expert Opinions: Psychiatrists, neurologists, or geriatric specialists may be called to assess capacity.
Legal Arguments: Lawyers representing beneficiaries or claimants present evidence of incapacity or undue influence.
Judicial Decision: The court decides whether the will is valid or partially invalid. In some cases, an earlier will may be reinstated.
The process can be complex and emotionally charged, which is why expert legal guidance is critical.
How to Protect a Will from Testamentary Capacity Challenges
Proactively taking steps to secure testamentary capacity can reduce disputes. Effective measures include:
Obtaining Medical Assessments: Have a GP or specialist assess capacity, especially if the testator is elderly or ill.
Recording Meetings with Solicitors: Detailed notes on the testator’s understanding of the will can serve as evidence.
Ensuring Independent Witnesses: Witnesses who are not beneficiaries or connected parties strengthen legitimacy.
Clear Explanations: Lawyers should explain all aspects of the will to ensure comprehension.
Documenting Mental Clarity: Journals, video recordings, or formal statements can serve as evidence of capacity.
These steps reduce the risk of disputes and make it harder for challengers to succeed.
Why Contentious Probate Cases Are Rising
There has been a noticeable rise in contentious probate claims, which may be driven by:
Increasing life expectancy and cognitive health issues
Growing family conflicts over inheritance
Complex estate arrangements with multiple wills
Greater awareness of legal rights among beneficiaries
As a result, families are more likely to engage in disputes over testamentary capacity, making professional legal advice more essential than ever.
Choosing a Specialist Probate Lawyer
If you are facing a potential challenge, engaging a specialist probate lawyer is vital. Your lawyer can:
Assess the validity of the will
Collect and present evidence effectively
Negotiate settlements or represent you in court
Minimise emotional and financial stress during disputes
Expert advice increases the likelihood of protecting the testator’s true intentions and resolving contentious issues efficiently.
Key Takeaways on Testamentary Capacity in the UK
Testamentary capacity is essential for making a valid will under law.
Challenges often arise due to cognitive decline, mental illness, or undue influence.
Contentious probate refers to disputes over wills after a testator’s death.
Red flags include sudden changes, cognitive impairment, undue influence, and inconsistent wills.
Legal and medical evidence is critical in defending or challenging testamentary capacity.
Proactive measures, like medical assessments, clear documentation, and independent witnesses, strengthen a will’s validity.
Specialist probate lawyers play a vital role in navigating disputes and ensuring the testator’s wishes are honoured.
Need Help Today?
Challenging testamentary capacity in a will is a serious legal matter which can deeply affect families and estates. Recognising red flags and taking proactive steps can prevent disputes, while expert legal guidance ensures that a testator’s intentions are respected. We work with highly experienced probate layers who can guide you during this stressful time with care and understanding.
Call us at 0333 358 2345 or contact us online and we will call you back.
We partner with panel firms who offer a range of fee structures, including ‘No Win, No Fee’ for certain cases along with other flexible funding – speak to our team to find out more.