Contested Wills: Grounds for Challenge and Litigation Strategies

Will Contests in Practice: More Common Than Clients Expect

Honestly, will contests are among the most emotionally charged and procedurally demanding matters in estate practice — a fully litigated case often burns $200,000–$500,000 per side and runs 3–5 years to verdict. A disinherited family member, a caregiver who lands a disproportionate bequest, or a child from a prior marriage who believes they got cut out — these situations generate litigation that consumes years of administration and hundreds of thousands of dollars in fees. The substantive grounds (and the procedural rules under statutes like UPC §3-407) matter for attorneys on both sides.

The grounds for contesting a will are narrower than many contestants realize. Courts don't invalidate wills just because the result seems unfair, or because the decedent's choices displease surviving family.

Testamentary freedom — the right to leave your property to whoever you choose — is a deeply embedded common-law principle recognized by the American Bar Association and upheld consistently in American courts. You can't win a contest on dissatisfaction alone; you need proof of one of a handful of specific legal defects.

This article covers the primary grounds for challenge, the procedural requirements contestants must satisfy, the evidentiary burdens involved, the enforceability of no-contest clauses, and the strategic case for mediation. For context on how contested wills affect administration timelines, see our probate timeline expectations guide.

Lack of Testamentary Capacity

The most common ground for will contests is lack of testamentary capacity. Under the test derived from Banks v. Goodfellow (1870) and codified in various forms across American states, the testator must (1) understand the nature of making a will, (2) know the nature and extent of their property, (3) understand the natural objects of their bounty (typically family members), and (4) understand the relationship of these elements to each other and the effect of the will. This is a deliberately low bar—significantly lower than the capacity required to enter a contract.

The practical challenge in capacity cases is the timing of the evaluation. Capacity is assessed at the moment of execution, not at the testator's death.

A testator with early-stage dementia who had a lucid interval on the day they signed a will may have had sufficient capacity even if their overall cognitive decline was severe. Conversely, a testator who appeared functional in daily life but was experiencing medication-induced confusion on the day of execution may have lacked capacity for that specific act.

Evidence in capacity cases typically includes medical records, witness testimony from the drafting attorney, testimony from care providers and family members, and expert neurological or geriatric psychiatry testimony. The drafting attorney's notes and their recollection of the signing ceremony are often pivotal. This is why thorough documentation of the client interview and execution ceremony—including notes about the testator's demeanor, responsiveness, and expressed understanding of the document—is an essential risk management practice for any attorney drafting a will for an elderly or ill client.

Undue Influence: The Hardest Claim to Prove and Disprove

Undue influence is the ground that generates the most litigation and the most contested expert testimony. To establish undue influence, the contestant must generally show: (1) a susceptible testator (due to age, illness, or dependency), (2) opportunity to exert influence, (3) a disposition to exert influence for an improper purpose, and (4) a result that appears to be the effect of that influence. Some jurisdictions recognize a presumption of undue influence when a confidential relationship exists between the beneficiary and the testator.

The classic scenario involves a caregiver, romantic partner, or distant relative who becomes the primary companion of an aging testator, isolates them from family, and engineers a will revision that dramatically increases their share. Courts look for circumstantial evidence: sudden changes in estate plan, beneficiary present during the attorney consultation, beneficiary who selected or recommended the drafting attorney, restricted access to other family members, and the testator's declining physical or mental state.

For the defense, the most powerful tool is a thoroughly documented drafting file. An attorney who met privately with the testator, confirmed their independence, asked open-ended questions about their wishes, and noted responses contemporaneously will be in a far stronger position than one who prepared a will at the request of the beneficiary without independent client contact. The ABA's Model Rules of Professional Conduct address conflicts of interest in estate planning that arise when the potential influencer is involved in the drafting process.

Improper Execution, Fraud, and Revocation

Improper execution claims focus on whether the will was signed, witnessed, and notarized in compliance with the applicable state statute. Cornell Law School's Legal Information Institute (law.cornell.edu) provides a useful state-by-state overview of will execution requirements. The UPC requires the will to be signed by the testator (or someone at the testator's direction in their presence) and signed by at least two witnesses who signed within a reasonable time after witnessing the testator's signing or acknowledgment.

Fraud claims in the will contest context typically fall into two categories: fraud in the inducement (the testator was deceived about facts that affected their testamentary intent, such as being told a child had predeceased them when they had not) and fraud in the execution (the testator was deceived about the nature of the document they were signing, believing it was something other than a will). Fraud is difficult to prove but, when established, results in complete invalidity of the will.

Revocation claims assert that the will being offered for probate was revoked before death—either by a subsequent will, by a physical act (burning, tearing, obliterating), or by operation of law (divorce revokes bequests to a former spouse in most states). Lost will cases present a particular challenge: if the testator was last known to have possession of a will and it cannot be located at death, many states apply a presumption of revocation by physical act that the proponent must rebut.

No-Contest Clauses: Deterrent or Dead Letter?

A no-contest clause (also called an in terrorem clause) provides that any beneficiary who challenges the will forfeits their bequest. These clauses are a powerful deterrent when the contestant stands to receive something under the challenged will—because a failed challenge could result in losing that bequest entirely. They are useless against a contestant who receives nothing under the will, since they have nothing to forfeit.

The enforceability of no-contest clauses varies significantly by state. California enforces them with exceptions for contests based on probable cause.

Florida, Indiana, and a few other states do not enforce them at all as contrary to public policy. Most states enforce them unless the contestant had probable cause for the challenge or the contest falls within a statutory exception. Attorneys drafting wills with no-contest clauses must understand whether the clause will actually be enforceable in the state where the will is likely to be probated.

Strategic considerations for the proponent of a will with a no-contest clause include ensuring that each beneficiary who might contest receives enough under the will that the forfeiture risk is a meaningful deterrent. A contestant who receives a $5,000 bequest in a $5 million estate has little to lose by filing suit. A contestant who stands to receive $500,000 faces a more serious calculus.

Mediation as a Will Contest Strategy

Contested will litigation is expensive, slow, and emotionally destructive. Probate courts in most jurisdictions now encourage or require mediation before trial, and for good reason: the vast majority of will contests that reach mediation settle.

The economics are compelling. A fully litigated will contest can consume $200,000–$500,000 in attorney fees on each side and take three to five years to resolve. A mediated settlement, even one that gives the contestant less than they sought, almost always leaves more value for the family than years of litigation.

For attorneys representing the estate or the will's proponents, mediation offers the opportunity to end the dispute without the risk of an adverse jury verdict invalidating the will entirely. For attorneys representing contestants, mediation provides a forum to use the evidence gathered in discovery—particularly damaging medical records or caregiver testimony—without a full trial. Both sides should approach mediation with realistic valuations of the case and a genuine willingness to compromise.

The selection of the mediator matters significantly in will contest cases. Pick a mediator with estate litigation experience — someone who understands the evidentiary dynamics of capacity and undue influence cases — over a general commercial mediator.

Some probate courts maintain panels of specialized estate mediators. The ABA Section of Real Property, Trust and Estate Law publishes resources on dispute resolution in estate matters that practitioners should consult.