How Courts Assess Mistake Claims in Wills

Disputes over wills often involve allegations that a mistake in the drafting, interpretation or execution of the document has caused it to fail to reflect the true wishes of the testator (the person who made the will). Courts in England and Wales recognise that simple errors can arise and that, in limited circumstances, legal mechanisms exist to address those mistakes. However, setting aside a will solely on the basis of mistake is difficult and subject to strict legal tests and time limits. This article explains how courts assess mistake claims in wills, the legal basis for rectification and construction claims, types of mistakes, how evidence is evaluated, and related practical issues.

Introduction to Mistake Claims in Wills

A mistake claim in the context of a will arises where it is alleged that the document does not reflect what the testator actually intended. Mistakes may occur when:

• a drafting error changes the meaning of a provision;
• a clerical error introduces incorrect information;
• the drafter misunderstands or misrecords the testator's instructions; or
• ambiguous language leaves a provision open to multiple interpretations.

Not all mistakes will justify setting aside a will. Courts distinguish between clerical errors that misrecord intentions and other errors such as poor drafting or misunderstandings of legal effect. The principal legal mechanism for correcting mistakes in wills is rectification, and courts may also apply construction principles to interpret ambiguous provisions.

Legal Framework: Rectification and Construction

Rectification Under the Administration of Justice Act 1982

Section 20 of the Administration of Justice Act 1982 allows the court to rectify a will where it fails to carry out the testator's intention due to:

• a clerical error in transcription or typing; or
• a mistake by the person drafting the will in understanding the testator's instructions.

The rectification process is grounded in equity and focuses on giving effect to what the testator intended rather than what the physical wording of the will actually says.

Requirements for Rectification

To succeed in a rectification claim, the applicant (often a beneficiary or executor) must demonstrate that:

1. The written document does not reflect the true testamentary intentions due to error; and
2. There is clear evidence of what the testator intended and that the error was unintended.

This evidence may include the drafter's notes, witness statements, contemporaneous communications, and other documentation showing the deceased's instructions.

Rectification does not apply where the drafter merely misunderstood how the words they chose would operate in law unless that misunderstanding leads to a mistake about the testator's instructions

Construction of Ambiguous Wills

If a will contains unclear or ambiguous language rather than an identifiable drafting error, the court may undertake construction - interpreting the terms to give effect to the testator's likely intentions based on the language used and the context in which the will was made. Under Section 21 of the Administration of Justice Act 1982, extrinsic evidence (beyond the will itself) may be admissible when interpreting ambiguity.

Construction is distinct from rectification because it does not “correct” an error but seeks to understand and apply the meaning of the document as intended.

Types of Mistakes Recognised by the Courts

Clerical Errors

Clerical errors are mistakes in transcription or typing that change the obvious meaning of a provision. Examples include:

• misspelling a beneficiary's name;
• omitting or adding a word, figure or clause; or
• inserting incorrect dates or percentages.

Clerical errors are the most readily capable of rectification because they result from clear slips rather than substantive drafting choices.

Mistakes in Recording Intent

Where the drafter fails to understand the instructions given by the testator, and this misunderstanding leads to a provision that does not reflect what the testator wanted, courts may rectify the will. For example, if the testator clearly expressed how they wanted their estate divided, but the drafter recorded it incorrectly, this may support a rectification claim.

Ambiguous or Unclear Wording

Ambiguous language that leaves provisions open to multiple interpretations does not necessarily mean the will should be rectified. Instead, the court may consider evidence to determine the most plausible meaning and interpret the provision accordingly. Extrinsic evidence may be used if the language is ambiguous in context.

Evidence and Burden of Proof

Burden on the Applicant

The person seeking rectification bears the burden of proof to show, on the balance of probabilities, that the will differs from the deceased's intentions due to an error and what those true intentions were. Evidence must be clear and convincing because courts are cautious about altering testamentary documents after the testator's death.

Types of Evidence Considered

Courts consider a range of evidence, including:

• the will drafter's file and contemporaneous notes;
• witness statements from family, friends or professionals present when instructions were given;
• correspondence between the testator and drafter; and
• any other documentation reflecting clear testamentary intentions.

Medical evidence or capacity concerns may also be relevant if the mistake was influenced by a testator's mental state at the time instructions were given, but this is separate from the rectification ground.

Time Limits and Practical Steps

Time Limits for Rectification Claims

A claim for rectification must be made within six months of the grant of probate being issued. The court has discretion to allow a claim outside this period if there is good reason, such as where the applicant was unaware of the will's provisions or their interest at the time.

Practical Evidence Gathering

Given the strict requirements, early action is important. Beneficiaries or executors should consider:

• obtaining the will drafter's file promptly;
• securing witness statements before memories fade;
• reviewing any correspondence or instructions; and
• seeking expert assistance to analyse drafting errors or ambiguities.

Related Claims: Professional Negligence

If a will cannot be rectified or interpreted favourably, another option may be a professional negligence claim against the drafter (often a solicitor or will‑writer) if their error caused financial loss. A professional negligence claim is separate from a rectification application and requires proof that the drafter failed to exercise reasonable skill and care, and that this caused loss.

Common Questions from our Readers

Does any mistake invalidate a will?
No. Simple errors do not automatically invalidate a will. Only mistakes that meaningfully prevent the document from reflecting the testator's intentions may support rectification or interpretation.

Can a mistake claim include challenges like fraud or undue influence?
Yes. Mistake claims are distinct from other grounds such as fraud, undue influence or lack of capacity, but evidence of mistake may overlap with other issues in contested will proceedings.

Is rectification the same as rewriting a will?
No. Rectification corrects specific errors that caused the document not to reflect the testator's clear instructions. It does not allow the court to rewrite a will based on what it thinks the testator should have said.

Key Takeaways

Courts in England and Wales approach mistake claims in wills with caution. A will can be rectified under the Administration of Justice Act 1982 if it fails to reflect the testator's true intentions due to a clerical or drafting error. Rectification requires clear evidence of the mistake and what was intended, and claims must generally be made shortly after probate. Where language is ambiguous, the court may interpret the will's terms using contextual evidence. Professional negligence claims against drafters are a separate option where errors cause financial loss. Understanding how courts assess mistake claims helps beneficiaries and executors identify appropriate steps and manage contested will disputes effectively.