Trust & Estate Litigation · Haute Lawyer Network
What Is Undue Influence in a Will or Trust?
Last reviewed: June 2026
Undue influence occurs when one person exerts such significant control over another — particularly an elderly or vulnerable person — that the controlled person's free will is overborne and they make estate planning decisions that reflect the influencer's wishes rather than their own.
It is one of the most common grounds for challenging a will or trust and can arise in family situations, caregiver relationships, and romantic partnerships.
Proving undue influence typically requires showing:
- Susceptibility — the testator was vulnerable due to age, illness, cognitive decline, isolation, or dependence.
- Opportunity — the influencer had the chance to exert influence.
- Motive — typically financial benefit from the changed estate plan.
- Result — a will or trust that disinherits expected beneficiaries in favor of the influencer, reflecting the influence rather than the testator's true wishes.
Frequently Asked Questions
What is the difference between undue influence and fraud in an estate context?
Fraud involves misrepresentations — lies told to induce estate plan changes. Undue influence involves pressure or manipulation that overrides free will. Both can result in invalidation of the will or trust.
How do I know if a family member was unduly influenced?
Warning signs include sudden, unexplained changes to an estate plan shortly before death, new changes that benefit a caregiver or recently met person, isolation of the testator from family and friends, and evidence of cognitive decline or dependence.
Can a will be partially invalidated for undue influence?
Yes. Courts can invalidate specific provisions that were the product of undue influence while preserving the rest of the will.
What is the burden of proof for undue influence?
In most states, the person challenging the will or trust must prove undue influence by a preponderance of the evidence. Some states shift the burden to the beneficiary in certain circumstances — such as when the beneficiary participated in drafting the will.
What can family members do while a loved one is still alive if they suspect undue influence?
Consult an elder law or estate planning attorney immediately. Options include a guardianship or conservatorship proceeding to protect the vulnerable person, intervention with the estate planning attorney, and careful documentation of the suspected influencer's conduct.
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