Educational guide — not legal advice. Will contest law varies substantially by state. If you’re considering contesting a will, talk to a licensed probate attorney in the state where the will is being probated.
When a will can actually be contested
Most US states recognize four main grounds for contesting a will:
1. Lack of testamentary capacity
The most commonly alleged ground. To make a valid will, the testator (the person making the will) must have been “of sound mind” at the time of signing — specifically:
- Understood the nature of the act they were performing (making a will)
- Understood the nature and extent of their property
- Knew their natural beneficiaries (family members)
- Could form a rational plan for distributing their property
The legal standard is lower than you might think. Someone with mild or moderate dementia can still have testamentary capacity at the time of signing if they understood the basics on that particular day. Capacity is evaluated at the moment of signing, not before or after.
To prove lack of capacity, contestants typically need:
- Medical records showing the testator’s mental state at the time
- Testimony from people who saw the testator that day
- Evidence of confusion about basic facts (who their children were, what their assets were)
- Often, expert testimony from a psychiatrist or neurologist
2. Undue influence
The second most common ground. This requires showing that someone exerted such pressure on the testator that the will doesn’t reflect the testator’s actual wishes — it reflects the influencer’s.
Mere influence isn’t enough. The standard is undue influence — substantial enough to overcome the testator’s free will. Typical patterns:
- A caregiver who isolated an elderly parent from other family members and then “helped” them change their will
- A new romantic partner who pressured the testator to disinherit children
- An adult child who lived with an aging parent and gradually took over decision-making
Common evidence of undue influence:
- The testator was isolated from other family members before the will change
- The influencer had control over the testator’s daily life
- The new will is substantially different from prior wills (a “sudden change”)
- The new will benefits the influencer disproportionately
- The testator was in a state of dependence (physical, emotional, financial)
- The influencer arranged the legal services that drafted the new will
3. Fraud
Fraud means the testator was deceived into signing the will or its terms. This can be:
- Fraud in the execution — the testator was tricked about what they were signing (told they were signing a deed or contract when actually signing a will)
- Fraud in the inducement — the testator was deceived about facts that influenced the will’s terms (told that a beneficiary had died when they hadn’t, told that a child had done something they didn’t)
Fraud is harder to prove than undue influence because it requires showing specific false statements made to the testator and the testator’s reliance on them.
4. Improper execution
The will didn’t meet the state’s legal requirements for valid execution:
- Not properly witnessed — most states require two competent witnesses
- Witnesses didn’t actually see the signing or hear the testator acknowledge it
- The testator didn’t sign at the end (in states with strict requirements)
- The will wasn’t entirely in handwriting for holographic wills in states that require it
- The witnesses were also beneficiaries in states where this voids the will or the gift
Improper execution is the most “technical” ground — it doesn’t depend on what the testator intended, just whether the document was executed legally. When proven, it usually voids the will entirely.
Who can actually contest
Not anyone can file a will contest. You need legal standing — meaning you have to be someone whose financial interest is affected by the will being valid or invalid.
People with standing typically include:
- Heirs at law (people who would inherit if there were no will) who would receive less under the contested will than under intestacy
- Beneficiaries under a prior will who received less or nothing under the contested will
- Creditors of the estate in some specific situations
- Charities or organizations named in a prior will but not the contested one
Without standing, the court will dismiss the contest regardless of the merits.
How a will contest actually works
The typical process:
1. The will is filed for probate
The will is submitted to the probate court in the county where the deceased lived. The executor named in the will starts the probate process. Notice is given to heirs and beneficiaries.
2. Caveat or contest filing
Anyone with standing files a formal caveat or will contest petition within the deadline that state’s statute sets, which runs from notice. Missing the deadline forfeits the right to contest.
3. Initial proceedings
The court typically:
- Holds initial hearings to set procedure
- Determines whether the contestant has standing
- Orders the executor to provide an inventory and accounting
- Often allows discovery (witness depositions, document production, medical records)
4. Discovery
The contestant gathers evidence:
- Medical records of the testator
- Depositions of witnesses, the drafting attorney, family members, caregivers
- Bank and financial records
- Prior versions of wills
- Communications between the testator and the alleged influencer
Discovery is where most of the cost accumulates; how long it runs is set by the court’s scheduling order.
5. Settlement or trial
Most contests settle before trial — typically with the contesting party receiving some portion of what they would have received under a prior will or intestacy, in exchange for dropping the challenge.
For contests that go to trial, the trial is usually by judge rather than jury and ends with a written ruling. The judge either:
- Admits the will to probate (contest fails)
- Denies probate of the contested will (contest succeeds), in which case a prior will or intestacy controls
6. Appeals
Either side can appeal, on the timetable the appellate rules of that state set.
What it actually costs
What a contest costs is set by the firm, and rises with the stage it reaches — a settlement before significant discovery, a contested case with discovery and trial, and a multi-party case taken through appeal are three different amounts. We found no independent published source for what a contest costs as of September 2026; the ranges that are published come from law firms, so none is cited here. These costs are generally paid by the contestant, though contingency-fee arrangements exist. The estate sometimes pays the executor’s legal fees from estate assets, which reduces what’s available for beneficiaries regardless of outcome.
What the record shows about contests
What is at stake
The amount in dispute is the difference between what the contestant takes under the challenged will and what they would take under a prior will or under intestacy. The legal costs are set by the firm and are not netted against it here.
How often contests succeed
Most will contests fail. The contestant has the burden of proof, and judges generally respect a testator’s right to dispose of their property as they choose.
Strong cases typically have:
- Medical records documenting significant cognitive decline at the time of signing
- A pattern of isolation by an alleged influencer
- A dramatic departure from prior wills with no good explanation
- Suspicious circumstances around the drafting (the influencer arranged the attorney, attended the signing, etc.)
Weak cases typically have:
- “Mom always said she’d leave me the house” with no documentation
- A will that benefits a long-time partner over biological children
- A new will that’s reasonable given changed circumstances
- The deceased had eccentricities but no documented incapacity
What the proceeding is on the record
A contest is filed in the probate court and forms part of the public record of that estate.
Is there a no-contest clause?
Many wills include a no-contest clause (also called an in terrorem clause) — language saying that anyone who contests the will forfeits any inheritance they would have received. These clauses are enforceable in many states (with exceptions for contests filed in good faith).
Where a contestant would take something under the challenged will and more under a prior will, an enforceable no-contest clause puts what they already take at risk in the contest.
Procedures short of a contest
- Negotiation with the executor or other beneficiaries before filing
- Mediation through a probate court mediator
- Challenging specific transfers (gifts made shortly before death, beneficiary designation changes) without contesting the will itself
- Reporting to the state attorney general if elder abuse is suspected
When contests succeed
The patterns most likely to produce a successful contest:
- Medical evidence of incapacity at the time of signing, particularly for testators in advanced dementia
- Documented isolation by an alleged influencer leading up to the new will
- Suspicious circumstances around the drafting (the influencer arranged the attorney, attended every meeting, paid the legal fees)
- No-prior-relationship beneficiaries (caregivers, new romantic partners) receiving substantial inheritance over biological family
- Technical execution failures that void the will regardless of intent
When contests fail
Patterns that typically lose:
- Disagreement with the testator’s choices that doesn’t rise to legal grounds
- “She wouldn’t have done that” without supporting evidence
- Beneficiary changes that have rational explanations (a closer relationship later in life, a beneficiary’s misconduct, etc.)
- Mild eccentricity or quirky behavior that doesn’t constitute incapacity
- Long-time partners or non-family beneficiaries when there’s no evidence of undue influence
What the record shows about contesting a will
The documented elements of a contest are the statutory grounds set out above, the limitation period for filing, the burden of proof, and the cost range reported by the sources cited on this page. A contest is filed in the court where the will is being probated, and the state’s limitation period runs from the notice that state’s statute specifies.
The documented figures to set against a contest are the reported cost range above, the limitation period for filing, the burden of proof on the contestant, and any no-contest clause in the will and its statutory good-faith exception. Settlement is available at any stage and, where all interested parties consent, most states permit a family settlement agreement to be entered without a finding on the merits. Those are the elements that determine whether the legal case and the amount at stake justify it.**
Related reading
- How to Write a Will (and What Makes It Valid)
- What Is Probate?
- Do I Need a Will?
- Elder Financial Abuse
- Power of Attorney Explained
- How to Find a Good Estate Attorney
Educational information only — not legal advice. Will contest law varies substantially by state. If you’re considering contesting a will, consult a licensed probate attorney in the appropriate jurisdiction. Sources: American Bar Association; National College of Probate Judges; state probate codes; Restatement (Third) of Property: Wills and Other Donative Transfers.