Resolving Inheritance and IHT Disputes: A Guide to the Legal Framework

Inheritance disputes are among the most emotionally and financially damaging events a family can face. What began as a private family matter routinely escalates into prolonged litigation that consumes a significant portion of the estate it was meant to protect, damages relationships irreparably, and leaves participants — however they emerge — with lasting scars. Understanding the legal framework, knowing where disputes arise, and acting early to prevent or resolve them is far more cost-effective than fighting them through the courts.

This guide covers the principal causes of action and legal frameworks relevant to inheritance disputes in England and Wales, together with the resolution mechanisms available.

Inheritance (Provision for Family and Dependants) Act 1975

The Inheritance (Provision for Family and Dependants) Act 1975 (the "Inheritance Act") gives the court power to override a Will, or the intestacy rules, to make "reasonable financial provision" for certain categories of claimant who have not been adequately provided for by the deceased's estate. This is one of the most frequently invoked causes of action in contested estate matters.

Who can claim? Eligible applicants include:

• The spouse or civil partner of the deceased.
• A former spouse or civil partner (unless remarried).
• A cohabitant who lived with the deceased for two years immediately before death.
• A child of the deceased (including adult children and step-children treated as children of the family).
• Any person treated by the deceased as a child of the family.
• Any person who immediately before death was being maintained by the deceased.

Standard of provision. For a surviving spouse, the standard is what is "reasonable in all the circumstances" — a higher standard than for other applicants, who may only claim provision for their "maintenance" (i.e. their day-to-day needs). Adult children face a higher hurdle — they must demonstrate genuine financial need; disappointed expectations alone are not sufficient.

Time limit. Claims must be brought within six months of the Grant of Probate or Letters of Administration. The court has discretion to extend this, but late applications are strongly disfavoured.

Practical implications. The possibility of an Inheritance Act claim affects the estate administration process. Executors may be reluctant to distribute the estate before the six-month window has passed, or before a claim has been resolved. Personal representatives should take legal advice early if they anticipate a claim.

TOLATA Disputes: Trust of Land and Appointment of Trustees Act 1996

TOLATA disputes arise most commonly where two or more individuals share an interest in property — typically a family home — and there is a dispute about the extent of their respective interests or about what should happen to the property.

Relevant scenarios include:

• An adult child who contributed to the purchase price of a parent's property and claims a share on death.
• A cohabitant who claims a beneficial interest in a property registered solely in the deceased's name.
• Siblings who disagree about whether to sell or retain a property left to them jointly.

Under TOLATA, the court can declare the beneficial interests of parties in disputed property, and can order a sale (or postponement of sale) taking account of the interests of all parties and, where relevant, minor children.

TOLATA claims can overlap with Inheritance Act claims and with proprietary estoppel arguments. Advisers dealing with disputed estates should consider all potential causes of action and their interaction.

Proprietary Estoppel

Proprietary estoppel arises where one person has made a representation or assurance to another that they will receive an interest in property, the other person has relied on that assurance to their detriment, and it would be unconscionable for the first person (or their estate) to resile from the assurance.

Classic examples in the estate context include:

• A farmer who promises a child that they will inherit the farm in exchange for working on it at below-market wages for decades, then either leaves the farm elsewhere by Will or dies intestate with the farm passing under the default rules.
• A parent who promises a cohabiting adult child that the family home will be theirs, and the child forgoes other housing options and contributes to the property in reliance on that promise.

The remedy for proprietary estoppel is not automatic: courts have broad discretion to fashion a remedy proportionate to the detriment suffered and the value of the assurance, which may fall short of the full interest promised. Proprietary estoppel claims are fact-intensive and expensive to litigate. Contemporaneous documentary evidence (emails, letters, witness statements) is critical.

Challenging a Grant of Probate

A Grant of Probate (or Letters of Administration on intestacy) can be challenged in the following ways:

Lack of testamentary capacity. The testator (Will-maker) must have been of sound disposing mind when executing the Will. They must have understood the nature of making a Will, the extent of their property, and the claims of those who might reasonably expect to benefit. Capacity is assessed at the date of execution. Medical evidence — from the testator's GP and, if relevant, specialist cognitive assessment — is central to these disputes.

Want of knowledge and approval. Even if the testator had capacity, they must have known and approved the contents of the Will. Suspicious circumstances — for example, where the Will was prepared by a beneficiary or significantly benefits a person who was involved in its preparation — put the burden of proof on those seeking to propound the Will.

Undue influence. A Will is invalid if it was procured by undue influence — pressure that overpowered the testator's free will. This is distinct from legitimate persuasion or advice. Undue influence is notoriously difficult to prove as it typically occurs in private.

Fraud and forgery. If the Will was not signed by the testator, or was executed in circumstances amounting to fraud, it can be set aside.

Failure of formal requirements. A Will must be signed by the testator (or by someone in their presence and at their direction) in the presence of two witnesses, who must each then sign in the testator's presence, in accordance with section 9 of the Wills Act 1837. Failure to meet these formalities can invalidate a Will. The court's statutory power of rectification (under section 20 of the Administration of Justice Act 1982) can correct a Will that fails to carry out the testator's intentions because of a clerical error or a failure to understand their instructions, but it does not cure a defect in the way the Will was executed.

Challenges to Wills are lodged at the Probate Registry, which can enter a caveat to prevent a Grant of Probate while the dispute is pending.

Deed of Variation vs Court Order

A deed of variation (also called a deed of family arrangement) allows beneficiaries of an estate, within two years of death, to redirect their entitlement to other beneficiaries. For tax purposes, the varied distribution is treated as if it had been made by the deceased, meaning IHT and CGT consequences are calculated on the varied basis. This is a powerful post-death estate planning tool where the original Will or intestacy produces a suboptimal outcome.

Key requirements for a valid deed of variation:

• All affected beneficiaries must consent.
• The deed must comply with specific formalities.
• A statement of intent to apply the tax treatment is required where the variation increases IHT or CGT liability.
• The variation must not be made for valuable consideration.

Where beneficiaries cannot agree on a variation — for example, because of a dispute about the estate — a court order is required to alter distributions. Court orders are expensive and time-consuming and cannot replicate the tax treatment available under a consensual deed of variation.

Mediation vs Litigation

The costs of litigated inheritance disputes are substantial. Both sides typically incur legal costs of £50,000–£200,000+ per party in a contested probate or Inheritance Act trial. These costs are usually (though not always) paid out of the estate, meaning the value available to beneficiaries is significantly reduced regardless of the outcome.

Mediation — a structured negotiation facilitated by an independent mediator — can resolve inheritance disputes at a fraction of the cost and in a fraction of the time. Its key advantages:

• Confidentiality: the mediation is private; a court hearing is public.
• Flexibility: the mediator can explore outcomes a court cannot order (emotional apologies, non-financial acknowledgements, family-specific arrangements).
• Speed: a mediation can be arranged within weeks; a court hearing may be 12–24 months away.
• Cost: a full day of mediation (with two parties) typically costs £5,000–£15,000 in total — a fraction of litigation costs.

Courts expect parties to have attempted mediation before proceeding to trial. Unreasonable refusal to mediate can result in adverse costs orders even against a winning party.

Overseas Wills: Recognition in UK Courts

Where a deceased had assets in multiple jurisdictions and executed Wills in different countries, questions of recognition arise.

Under the Wills Act 1963, a Will is formally valid in England and Wales if it was valid at the time and place of execution under the law of:

• The domicile of the testator (at the time of execution or at death).
• The habitual residence of the testator at either time.
• The nationality of the testator.
• The place of execution.

In practice, a properly executed Will from most developed jurisdictions will be formally recognised in England and Wales provided it meets the requirements of at least one of these connecting factors.

Recognition of the Will does not necessarily mean its substantive provisions will be applied to all assets — questions of applicable succession law, domicile, and the interaction with UK assets must be resolved separately. Grant of Probate (or a Resealing of a foreign grant) is required to deal with UK assets.

Practical Steps for Executors and Beneficiaries

For those dealing with a contested or potentially contested estate:

1. Engage an experienced contentious probate solicitor at the earliest possible stage.
2. Preserve all documents, electronic records, and communications relating to the deceased, the estate, and any relevant family history.
3. Obtain a medical opinion on the deceased's capacity at the date of Will execution, if relevant.
4. Consider registering a caveat at the Probate Registry if there are grounds to challenge the Will before a Grant is made.
5. Do not distribute the estate while a claim is pending or reasonably anticipated.
6. Engage constructively with mediation requests.

How Global Investments Can Help

Global Investments works alongside specialist contentious probate solicitors to support clients facing or anticipating inheritance disputes. We provide independent financial analysis of estate assets, assist with asset valuations where disputes involve investment portfolios or business interests, and can help clients understand the financial implications of proposed settlements or court orders. Contact us for an initial confidential discussion.

This guide is for information purposes only and does not constitute legal advice. Inheritance disputes are complex and jurisdiction-specific. Readers must obtain independent professional legal advice before taking any action. Rules and timescales cited are for England and Wales as at June 2026 and are subject to change.