Excessive persuasion, pressure, or manipulation that overcomes the free will of a testator or settlor, causing them to execute a will or trust contrary to their true wishes. Undue influence requires showing the influencer had opportunity, motive, and actually exerted pressure that substituted their will for the testator's independent judgment.
Undue influence is when someone pressures or manipulates you into making a will that reflects their wishes, not yours. It's more than just persuasion or even strong persuasion—it's coercion that overpowers your own free choice.
**Important:** Undue influence is notoriously difficult to prove. The person challenging the will bears the burden of proof, and courts set a high threshold. Suspicious circumstances alone aren't enough—there must be actual evidence that pressure was applied and that it overcame the will-maker's independent judgment.
⏱ When you'll encounter this term
- Will contests alleging improper pressure
- Situations involving vulnerable elderly persons
- Caregivers or relatives benefiting suspiciously
- Sudden unexpected changes to estate plans
"Dad's caregiver isolated him, told him we didn't care about him, and convinced him to leave everything to her. We contested the will based on undue influence—she had opportunity (constant access), motive (large inheritance), and used her position to override Dad's judgment."
⚖️ Compare: Undue Influence vs Lack of Capacity
Testator mentally capable. Someone else's will substituted. External pressure overcomes free choice.
Testator mentally incapable. Doesn't understand what they're doing. Internal mental deficiency.
💡 Why this matters
Undue influence claims are common in will disputes but rarely succeed. Courts recognise that family members naturally try to influence each other, and that's not illegal. The line is crossed only when persuasion becomes so overwhelming that the person effectively loses their free will.
Even when circumstances look suspicious—such as a sudden change to a will benefiting a caregiver—the challenger must still prove actual coercion occurred. Suspicion isn't enough.
💡 Did you know?
Courts are particularly alert to undue influence when a caregiver, attorney, or person in a position of trust receives large unexpected gifts or inheritance. In some situations, this may shift the evidential burden—but even then, the court must be satisfied that actual influence was exercised. The outcome depends on all the circumstances of the case.