Top Reasons Wills Get Challenged in the UK

A will can look perfectly clear on paper yet still become the centre of a painful family dispute. For business owners, property investors and families with significant assets, understanding the top reasons wills get challenged is not about expecting the worst. It is about putting arrangements in place that are clear, fair and difficult to misunderstand when emotions are running high.

A successful challenge can delay the administration of an estate, create substantial legal costs and put property, business interests and family relationships under real pressure. While no document can prevent every disagreement, carefully prepared estate planning can greatly reduce the scope for a claim.

Top reasons wills get challenged

A will may be challenged for several legal and practical reasons. Some claims focus on whether the will is valid at all. Others accept that it is valid but argue that it does not make reasonable financial provision for someone who depended on the person who died.

The detail matters. A disappointed adult child does not automatically have a successful claim simply because they expected an inheritance. Equally, leaving someone out of a will does not necessarily mean the will is safe from challenge. Each situation depends on the family circumstances, the evidence available and how the will was made.

Lack of mental capacity

For a will to be valid, the person making it must have the mental capacity to understand what they are doing. In broad terms, they need to understand that they are making a will, appreciate the value and nature of their estate, and recognise the people who may reasonably expect to benefit.

Capacity can become a concern where a will is made during dementia, serious illness, medication changes or a period of declining health. A late-life will is not automatically invalid, but it may attract closer scrutiny if it makes major changes or excludes close family members.

The practical protection is to take proper advice, make the will at an appropriate time and keep a clear record of the instructions and reasoning. Where capacity could later be questioned, an assessment or contemporaneous medical evidence may be sensible. This can provide valuable reassurance if the will is ever challenged.

Undue influence and pressure

A will must reflect the free wishes of the person making it. If somebody has pressured, intimidated or manipulated them into leaving assets in a particular way, the will may be challenged on the grounds of undue influence.

These cases are often difficult because pressure rarely takes place in front of witnesses. Concerns may arise where one person controlled access to an elderly relative, arranged the will-making process, isolated them from family, or stood to receive a surprising benefit.

This is particularly relevant where a valuable home, rental portfolio or family business is involved. A beneficiary should not direct the process or be present when instructions are given. Independent meetings, clear notes and appropriate witnesses all help demonstrate that the wishes were genuinely the testator’s own.

Concerns about how the will was signed

Even the best intentions can be undermined by a basic signing error. In England and Wales, a will must usually be in writing, signed by the person making it in the presence of two witnesses, and those witnesses must sign in their presence.

The witnesses should be independent. If a beneficiary, or the spouse or civil partner of a beneficiary, acts as a witness, the will itself may remain valid but that person’s gift can fail. Informal home signing arrangements, rushed execution and unclear alterations are common sources of avoidable difficulty.

A professionally managed signing process provides a reliable record that the correct formalities were followed. It is a simple safeguard, but one that can spare your executors a great deal of trouble later.

Fraud, forgery or suspicious circumstances

Allegations of fraud and forgery are serious, but they do occur. A signature may be disputed, pages may be alleged to have been substituted, or someone may argue that the person making the will did not know or approve its contents.

Suspicion can grow when a will is dramatically different from earlier arrangements, has been prepared in unusual circumstances, or benefits the person who organised it. That does not prove wrongdoing. People are entitled to change their minds and their priorities. But unexplained changes can make a challenge more likely.

Good records are often decisive. Written instructions, meeting notes, dated drafts and a secure copy of the signed will can all help establish what happened. Secure document storage is useful not only because it prevents a will being lost, but because it supports a clear trail of evidence.

A later will or revoked will

A will may be challenged because an earlier document is presented when a later valid will exists. A newer will normally revokes an earlier one, provided it was properly made. Marriage or civil partnership can also revoke an existing will unless it was made in contemplation of that specific marriage or partnership.

Problems also arise when people make handwritten amendments, destroy only part of a document or store several versions without making clear which is current. For families, this can create confusion at exactly the point when clarity is needed.

Reviewing your will after a marriage, divorce, separation, major purchase, sale of a business, birth of a child or significant change in wealth is sensible. A review does not always mean rewriting everything, but it confirms that the document still reflects your wishes and works alongside the rest of your estate plan.

Claims for reasonable financial provision

Not every claim argues that the will is invalid. Under the Inheritance (Provision for Family and Dependants) Act 1975, certain people may apply to the court if they believe the estate has not made reasonable financial provision for them.

Potential applicants can include a spouse or civil partner, former spouse or civil partner in some circumstances, children, people treated as children of the family, and people who were financially maintained by the person who died. The court looks at matters such as financial need, the size of the estate, responsibilities the deceased had, the claimant’s circumstances and the needs of other beneficiaries.

This can be especially sensitive in blended families. A second spouse may need security in the family home, while adult children may be concerned about protecting assets intended to pass down their side of the family. Simply relying on a straightforward gift to one person can sometimes create unintended consequences.

Trust planning may be appropriate where there are competing priorities. For example, a carefully structured trust can help provide for a surviving partner while preserving capital for children or protecting property from risks that may arise later. The right approach depends on the assets, family relationships and long-term objectives.

Why unequal inheritances can lead to disputes

Parents are not required to divide their estate equally between children. There may be good reasons to leave more to a child who works in the family business, has provided care, has greater financial need or has already contributed to a property.

The difficulty is not necessarily the unequal division. It is the lack of explanation. If an unexpected decision is discovered only after death, those left out may assume there was pressure, confusion or a mistake.

Where a decision is likely to surprise the family, a separate letter of wishes can explain the thinking in personal terms. It is not a substitute for a properly drafted will, and it needs careful handling, but it can help executors understand and communicate the reasoning. In some cases, a calm conversation during your lifetime may also prevent a far more damaging conflict later.

Protecting business and property interests

For business owners and property professionals, a will challenge can do more than hold up an inheritance. It can affect company shares, partnership interests, rent collection, refinancing decisions and the ability of those left behind to manage key assets.

Your will should therefore be considered alongside shareholder agreements, partnership arrangements, business protection policies, property ownership and any trusts already in place. A will that leaves a business interest to the right person may still cause problems if the company documents say something different or the estate lacks sufficient cash to meet other legacies and liabilities.

This is where bespoke planning matters. The objective is not merely to produce a valid document. It is to create a workable plan that protects the people you care about while taking account of the assets you have worked hard to build.

Practical steps that reduce the risk of a challenge

The strongest protection is usually a well-prepared, regularly reviewed will supported by good evidence. Take instructions independently, use suitable witnesses, avoid informal amendments and keep the original document safe. If your circumstances are complex, make sure your will is coordinated with your wider financial and business arrangements.

It is also wise to choose executors who are capable, impartial and willing to act. In a family where tensions are already present, appointing a professional executor or an independent person may reduce the risk of conflict, although this should be weighed against cost and the level of personal knowledge needed.

At The Legacy Wills, estate planning is approached as a wider protection strategy, not a one-off document exercise. Clear advice and careful planning can give your family the certainty they need when it matters most.

The most helpful time to address a possible will dispute is while you can explain your wishes, update your arrangements and make informed decisions with confidence. A thoughtful review now can protect far more than assets – it can protect the people and relationships you leave behind.