What does it mean to contest a will?

Contesting a will, defined

To contest a will means to formally dispute it through the legal system, rather than just objecting to what it says. In England and Wales that covers two distinct routes: arguing the will is not legally valid and should not be admitted to probate at all, or accepting the will is valid but claiming it fails to make reasonable financial provision for you under the Inheritance (Provision for Family and Dependants) Act 1975. Everything else, the caveats, the evidence, the court claims, hangs off that two-way split.

This page is the quick definitional version. For the grounds, process and evidence in depth, see our full guide on how to contest a will in the UK. What follows is general information about how the framework operates, not legal advice, and it is no substitute for a solicitor looking at the facts of an actual dispute.

Route one: challenging the will's validity

A validity challenge says the document should not stand as the person's will. If it succeeds, the estate passes under the last earlier valid will, or under the intestacy rules if there is none. The recognised grounds are narrow:

• Lack of due execution. The will was not signed and witnessed as section 9 of the Wills Act 1837 requires: signed by the testator (or at their direction) in the presence of two witnesses, who each then sign in the testator's presence.
• Lack of testamentary capacity. The person did not understand what they were doing, the extent of their property, or who might expect to benefit, at the relevant time.
• Lack of knowledge and approval. The person did not actually know and approve the contents, for instance where suspicious circumstances surround how the will was prepared.
• Undue influence. Someone coerced the person into making the will, going beyond persuasion to overpowering their own judgement.
• Fraud or forgery. The signature is not genuine, or the will was procured by deception.

The people who can bring this kind of challenge are, broadly, those with something to gain from it: beneficiaries under an earlier will, or those who would inherit on intestacy if no valid will existed.

Route two: an Inheritance Act 1975 claim

The second route does not attack the will at all. A claim under the Inheritance (Provision for Family and Dependants) Act 1975 accepts the will is valid but argues it fails to make reasonable financial provision for the claimant. Only defined categories of people can claim, including a spouse or civil partner, a former spouse who has not remarried, a partner who cohabited for at least two years, children (including adult children), and anyone the deceased was financially maintaining. Crucially, section 4 of the Act sets a deadline: a claim normally needs court permission if started more than 6 months after the grant of probate (or letters of administration) is issued.

Caveats: how probate gets paused

Contesting usually begins quietly, with a caveat rather than a courtroom. A caveat is a notice lodged with the probate registry that stops a grant of probate being issued while questions about the will or the estate are looked into. Under the process on GOV.UK's stop a probate application guidance, anyone aged 18 or over can enter one, it costs £4, and it lasts 6 months, extendable for a further 6 months. It is designed for genuine disputes about matters such as validity, not as a tool for delaying an estate or pursuing a 1975 Act claim, and using one wrongly can lead to costs orders.

What contesting a will does not mean

The most common misunderstanding is that a will can be contested simply because it feels unfair. England and Wales gives people broad testamentary freedom: leaving unequal shares, or leaving a family member out entirely, is not by itself a ground for challenge. A contest needs either evidence against validity or an eligible 1975 Act claimant. (Scotland takes a different approach, giving certain family members fixed legal rights over the moveable estate regardless of the will.) Nor does contesting mean the estate is frozen indefinitely: caveats time out, and most disputes settle by negotiation or mediation long before a trial.

Where this fits in the probate process

A dispute sits alongside, and usually ahead of, the normal administration steps covered in our probate guide. If a challenge is on the cards, the practical questions multiply quickly: what a dispute might cost is covered in our companion piece on the cost of contesting probate, and if you are weighing up professional help for the estate more generally, our DIY vs solicitor probate calculator shows how the numbers compare for your estate.

Because both routes are evidence-heavy and the 1975 Act deadline is short, this is one corner of probate where early professional input genuinely changes outcomes. If a dispute is more than a passing worry, a contentious probate solicitor can tell you quickly whether the concern maps onto a recognised ground, and what preserving your position (for example, with a caveat) would involve. For everything beyond this definition, start with the full contesting a will guide.