Undue Influence in Wills — Coercion That Overbears Free Will

What undue influence means in probate law

Undue influence in the probate context is narrower and harder to prove than in equity. It is not enough to show that someone had the opportunity to influence the will-maker, or that they persuaded the will-maker to change their will. The person alleging undue influence must prove that the will-maker's free will was overborne by coercion — that the will does not reflect the will-maker's true intentions but rather the will of the influencer.

This distinction is critical: adult children frequently persuade parents about estate planning; carers often discuss wills; family members may apply emotional pressure. None of this, standing alone, constitutes probate undue influence. The law requires proof of coercion — that the testator was not a free agent when making the will.

The classic formulation comes from Wingrove v Wingrove (1885): the question is whether the will-maker was "able to exercise a free and independent judgment" or whether their mind was "overborne by pressure." The High Court in Bridgewater v Leahy (1998) confirmed that mere influence — even influence flowing from a relationship of trust and confidence — is not enough. There must be coercion.

Common warning signs — patterns that suggest undue influence

The Briginshaw standard of proof

Allegations of undue influence are serious — they amount to an assertion of wrongful conduct. Under the Briginshaw v Briginshaw (1938) principle, the court must be satisfied to a higher standard commensurate with the gravity of the allegation. This does not change the civil standard (balance of probabilities) but requires that the evidence be clear, cogent, and precise. The more serious the allegation, the stronger the evidence must be.

This means a mere suspicion of undue influence, or an inference drawn from opportunity alone, will not satisfy the court. The evidence must support a finding that coercion actually occurred and that the will does not represent the testator's true intentions.

In practice, Briginshaw operates as a screening mechanism. The court will assess the evidence as a whole — not piece by piece — and ask whether the combined weight of the evidence, assessed in light of the gravity of the allegation, establishes that coercion probably occurred. A single piece of weak evidence may not be enough, but multiple strands of independent evidence pointing in the same direction can satisfy the standard even if no single piece is conclusive.

How undue influence differs from related doctrines

Undue influence is often confused with other grounds for challenging a will. Understanding the distinctions is important:

• Undue influence vs lack of capacity: Capacity concerns whether the will-maker understood what they were doing. Undue influence assumes the will-maker had capacity but that their free will was overborne. In practice, these grounds often overlap — a vulnerable will-maker with diminished capacity is also more susceptible to coercion. A comprehensive challenge may plead both.
• Undue influence vs suspicious circumstances: Suspicious circumstances (the doctrine from Wintle v Nye) shifts the evidentiary burden to the propounder of the will to prove knowledge and approval. Undue influence is a separate affirmative allegation that the person alleging it must prove. The distinction is important: if you cannot prove undue influence, you may still succeed on suspicious circumstances if the court shifts the burden to the propounder.
• Undue influence vs family provision: A family provision claim accepts the will is valid but seeks provision for an eligible person. Undue influence challenges the will itself. A family provision claim is often easier to prove than undue influence — if you are an eligible person and the will makes inadequate provision, a family provision claim may be a more practical route even if you also suspect undue influence.
• Undue influence vs equitable undue influence: Equitable undue influence (from Johnson v Buttress) applies to lifetime transactions — gifts, transfers, contracts. It is broader and easier to establish, particularly where a relationship of trust and confidence is presumed. Probate undue influence is narrower. An elderly parent pressured by a carer to transfer their house during their lifetime faces a different legal test than if the carer pressured them to change their will.

Evidence that matters in undue influence cases

Undue influence is rarely proved by direct evidence — there is seldom a witness who saw the influencer say "change your will or I will abandon you." The court draws inferences from the totality of the surrounding circumstances. The quality of your evidence — its detail, its independence, its contemporaneity — is what matters. Below are the categories of evidence that carry the most weight.

• All versions of the will and any codicils — the pattern of changes over time is critical
• Solicitor file notes — who attended conferences, who gave instructions, and whether private consultation occurred
• Medical records — evidence of vulnerability, cognitive state, dependency, and susceptibility to influence
• Witness statements from family, friends, and carers — describing changes in behaviour, access, and control
• Records of the influencer's involvement — who arranged solicitor visits, transported the will-maker, managed finances
• Correspondence showing the influencer's control over communication and information flow
• Timeline of key events — will changes, hospitalisations, moves to new accommodation, relationship changes
• Evidence of the will-maker's previously expressed intentions — earlier wills, statements to family, letters of wishes

The will file — the solicitor's role

The solicitor who prepared the will is often the most important witness in an undue influence case. Their file notes, attendance records, and recollection of who was present during instructions can make or break a case. A solicitor who:

• Took instructions from the will-maker alone, in private, with no other person present
• Assessed and recorded the will-maker's testamentary capacity
• Recorded the will-maker's own stated reasons for the dispositions in the will
• Was satisfied that the will-maker was acting freely and voluntarily
• Made contemporaneous file notes of the conference

— provides strong evidence against undue influence. Conversely, a solicitor who took instructions from the alleged influencer, who never saw the will-maker alone, whose file notes are absent, incomplete, or appear to have been created after the fact, or who was chosen by the influencer (not the will-maker) may support an inference that the process was compromised. A solicitor who is also the influencer's solicitor (or who acts for the influencer in other matters) raises clear conflict questions.

Medical evidence — vulnerability and susceptibility

Medical records are essential to establishing the will-maker's vulnerability. The more vulnerable the will-maker, the less pressure is required to overbear their will. Key medical evidence includes:

• Diagnoses of conditions affecting cognition — dementia, delirium, stroke, brain injury
• Records of medication — particularly medications affecting mood, cognition, or suggestibility
• Clinical notes describing the will-maker's presentation — confusion, distress, dependency
• Evidence of physical frailty creating practical dependency on the influencer
• Psychiatric or psychological assessments — particularly where the will-maker was grieving, depressed, or anxious
• Hospital admission records coinciding with will changes

Medical evidence does not need to establish incapacity — indeed, undue influence assumes capacity. It establishes vulnerability, which is the context in which coercion operates. A robust, independent, strong-willed person with full capacity is far harder to coerce than a frail, dependent, recently bereaved person with early cognitive decline.

Witness evidence — what family, friends, and professionals saw

Lay witness evidence is often the richest source of information about undue influence. The court gives weight to independent witnesses — neighbours, long-standing friends, treating doctors, former solicitors — whose evidence is not coloured by the financial interest in the outcome. Key topics for witness evidence include:

• Changes in the will-maker's behaviour after the influencer entered their life
• Statements the will-maker made about their estate planning intentions — both before and during the period of alleged influence
• Observations of the influencer's conduct — controlling access, speaking for the will-maker, isolating them
• The will-maker's expressed fear, anxiety, or reluctance — particularly statements suggesting they felt unable to resist the influencer
• Changes in the will-maker's living conditions, appearance, or demeanour
• Whether the will-maker expressed a desire to see particular people but was prevented from doing so

Contemporaneous records — diary entries, emails, text messages — are far more persuasive than recollections reconstructed years later. If you suspect undue influence, encourage witnesses to write down what they observed, with dates, while their memory is fresh.

Financial records — following the money

Financial evidence can reveal the influencer's motive and the extent of their control. Key financial evidence includes:

• Bank statements showing the will-maker's accounts — who had access, who made withdrawals
• Transfers of money or property from the will-maker to the influencer before death
• Changes to account signatories or the addition of the influencer as a joint account holder
• Payment of the will-maker's expenses — or failure to pay them — by the influencer
• The influencer's own financial circumstances — were they in financial difficulty at the relevant time?
• Property transfers — changes to land title, particularly transfers for nominal or no consideration

A pattern of financial exploitation before death — through POA misuse, joint accounts, or asset transfers — strongly supports an inference that the will was also the product of improper influence. The court looks at the whole picture: if the influencer was systematically extracting value from the will-maker during life, it is easier to infer they did the same through the will.

The timeline — constructing the narrative

An undue influence case is ultimately a story about what happened, supported by evidence. A detailed timeline is the backbone of that story. Your timeline should map:

• When the will-maker's previous wills were made, and what they said
• When the influencer entered the will-maker's life, and in what capacity
• When the will-maker's health declined — hospitalisations, diagnoses, changes in living arrangements
• When the will-maker's contacts with family and friends changed — calls stopped, visits were blocked
• When each will (or codicil) was made, and who benefited
• When key financial transactions occurred — transfers, account changes, property dealings
• When the will-maker died, and when probate was applied for

A well-constructed timeline can reveal patterns that individual pieces of evidence do not — such as a will change occurring within days of a hospital discharge into the influencer's care, or a series of financial transactions accelerating in the weeks before a new will was made.

What the court looks for — the evidentiary checklist

Drawing on the leading cases, the court will typically examine the following factors when assessing whether undue influence has been proved:

• The nature and intensity of the relationship: Was the influencer in a position of dominance? Did the will-maker depend on them?
• The will-maker's vulnerability: Age, health, cognitive state, emotional state, dependence
• The influencer's opportunity: Were they present when the will was made? Did they control access to the will-maker?
• The magnitude of the benefit: How much did the influencer receive compared to what they would have received under previous wills?
• The departure from previous intentions: Is the new will consistent with the will-maker's long-held plans and values?
• The process of will-making: Who chose the solicitor? Who gave instructions? Was there a private conference?
• The influencer's conduct: Were there lies, concealment, or manipulation? Did the influencer control information?
• Any independent reasons for the change: Is there an innocent explanation — such as a genuine falling-out with previously favoured beneficiaries?

The court weighs these factors together. No single factor is determinative — the question is whether the combined circumstances satisfy the court, to the Briginshaw standard, that the will-maker's free will was overborne.

NSW vs QLD — legal framework for undue influence

Undue influence is a common law doctrine recognised in both New South Wales and Queensland. Neither state has codified the doctrine — it is applied by the courts according to established common law principles. However, the statutory context, court procedures, and practical considerations differ between the two states.