What Invalidates a Will in the UK?

Understanding what can invalidate a will in the United Kingdom is essential if you are planning your estate or worried about a loved one’s wishes being honoured after they pass away. A will is a powerful legal document but it must be created correctly and under the right conditions to stand up in law. If it is not, it can lead to disputes, costly probate battles or even a partial or full declaration of invalidity in court.

How a Will Can Be Invalid in the UK

In England and Wales, the legal framework for wills is set out under the Wills Act 1837 and related legislation such as the Wills Act 1963. These laws determine the basic requirements for a will to be valid. If these requirements are not met, the will can be challenged and potentially invalidated. ^[1]

1. Failure to Meet Legal Requirements

For a will to be valid, it must meet several strict formal requirements laid out in UK law:

• The person making the will must be over 18 and of sound mind.
• The will must be in writing and intend to operate as the testator’s will.
• The testator must sign the will in the presence of two witnesses.
• Those witnesses must also sign in the presence of the testator.

If any of these basic requirements are missing or carried out incorrectly, the will can be declared void.

2. Lack of Testamentary Capacity

One of the most common grounds for a will being invalid is that the testator did not have the necessary mental capacity at the time they made the will. They must understand the nature of what they were doing and the effect of the document. If they did not, the will can be challenged on these grounds. ^[2]

3. Undue Influence or Coercion

A will must be made voluntarily. If someone pressured, coerced, manipulated or exerted undue influence over the testator, the will or certain parts of it might be invalidated. This is particularly relevant where evidence suggests that the testator made decisions under pressure from someone who benefits from the will. ^[2]

4. Lack of Knowledge and Approval

Courts may examine whether a testator genuinely understood and approved the contents of their will. If they did not see or understand what was written, the will can be at risk of being invalid. ^[2]

5. Forgery, Fraud or Serious Mistakes

If a will has been forged, created fraudulently, or contains major errors that misrepresent the testator’s intentions, this can form the basis of a legal challenge. In some cases, drafting errors may lead to rectification proceedings or professional negligence claims. ^[2]

6. Destruction or Revocation

A testator can revoke their will by making a new one or by deliberately destroying the original. If the signed original cannot be found after death, it may be presumed revoked in certain circumstances. ^[3]

How Often Are Wills Contested in the UK?

Disputes over wills and estates are becoming more common in England and Wales. Estimates suggest that around 10,000 people raise formal disputes relating to wills or inheritance each year, although only a small proportion proceed to a full High Court trial. ^[4] Ministry of Justice statistics show that in 2023, just over 120 contested probate claims were issued in the High Court. ^[5] Many cases settle before reaching a final hearing.

With rising property values and increasingly complex family arrangements, ensuring a will is properly drafted and executed is more important than ever.

Why Professional Advice Matters

If you are unsure whether your will is valid, or you are concerned about the validity of a loved one’s will, early legal advice can prevent significant stress and expense later on. Questions about capacity, undue influence or improper execution should always be assessed by a qualified solicitor experienced in wills and probate law.

ASL Solicitors, based in Rochdale, provide specialist will writing and probate services to individuals and families across Rochdale, Greater Manchester and the surrounding areas. Our team can help ensure your will complies fully with current UK law and can advise if you believe a will may be invalid. To speak to a solicitor, contact ASL Solicitors here.

Frequently Asked Questions

Can any will be challenged in the UK?

Yes. A will can be challenged if there are valid legal grounds such as lack of capacity, undue influence, fraud or failure to comply with statutory formalities.

What happens if a will is declared invalid?

If a will is found to be invalid, an earlier valid will may take effect. If there is no previous valid will, the estate will usually be distributed under the rules of intestacy. ^[6]

Is a handwritten will valid in the UK?

A handwritten will can be valid if it meets all legal formalities, including being signed and properly witnessed by two independent witnesses. Unwitnessed handwritten wills are generally not valid in England and Wales. ^[1]

How long do I have to contest a will?

The time limit depends on the type of claim. For example, claims under the Inheritance (Provision for Family and Dependants) Act 1975 typically must be made within six months of the grant of probate. ^[7]

What should I do if I am unsure whether a will is valid?

You should seek advice from a specialist wills and probate solicitor as soon as possible. Early advice can clarify your position and help you avoid unnecessary court proceedings.