You can challenge a will, but courts don’t set one aside because a relative feels shortchanged. To have any chance, you need four things: legal standing to file, a recognized ground for the challenge, evidence strong enough to prove it, and a petition filed inside your state’s deadline. Knowing how to challenge a will means understanding each of these before you spend a dollar on litigation, because probate contests are expensive, slow, and — if the will contains a no-contest clause — capable of leaving you with less than you were originally left.
Who Can File a Challenge
Standing is the first hurdle. You need a financial stake that changes depending on whether the will survives. Courts call these people “interested parties,” and the group is narrower than most families assume.
Three categories generally qualify. Beneficiaries under the current will can challenge it if they believe a later version cut their share improperly. Beneficiaries under a previous version have standing too, because invalidating the current will can reinstate the earlier one. And heirs-at-law — the spouse, children, parents, or siblings who would inherit under state intestacy rules if no valid will existed — can file even if no version of the will ever named them.
Friends, caregivers, and distant relatives who wouldn’t inherit under either the will or intestacy law usually cannot contest, no matter how unfair the outcome feels. Creditors may qualify in some states, but their disputes typically concern estate administration rather than the will itself.
The Four Legal Grounds
Disappointment is not a ground. A challenge must identify a specific defect in how the will was made or signed, and each recognized ground targets a different problem.
Lack of Testamentary Capacity
The testator must have been “of sound mind” at the moment of signing. Courts generally require that the person understood four things: that they were making a will, what property they owned, who their close family members were, and how the will would distribute their assets among those people. Failing on any one of those points can establish incapacity.
A diagnosis of dementia or Alzheimer’s doesn’t automatically invalidate a will. Cognitive conditions fluctuate, and courts recognize a “lucid interval” — a period of sufficient clarity during which a valid will can still be signed. The question is always whether the testator met the threshold at the specific moment of signing. Medical records, the attending physician’s testimony, and accounts from people who saw the testator around the signing date carry the most weight. Evidence of confusion at a family dinner two weeks earlier is not the same as evidence of incapacity in the attorney’s office that afternoon.
Undue Influence
Undue influence means someone in a position of trust — a caregiver, family member, financial advisor, or close friend — used that relationship to override the testator’s own wishes. Suggesting, asking, or even pressuring isn’t enough. The influence has to be controlling enough that the will reflects the influencer’s desires rather than the testator’s.
Courts look for patterns. Common red flags include isolating the testator from other family members, picking the drafting attorney, being present at the signing, knowing the will’s contents beforehand, and receiving a share inconsistent with the testator’s previously expressed wishes. When enough of these stack up, some states shift the burden through a legal presumption of undue influence, requiring the beneficiary to prove the testator acted freely. That presumption typically kicks in when the alleged influencer had a confidential relationship with the testator, received a substantial benefit, and actively participated in getting the will drafted or changed. Emails, texts, financial records showing transfers before death, and witness accounts of the relationship all matter.
Fraud or Forgery
Fraud means the testator was tricked into signing — told the document was something else, or lied to about a family member in order to write that person out. The deception has to have directly caused the signing.
Forgery is simpler in concept: someone faked the will or the testator’s signature. These cases almost always require a handwriting expert, and courts treat the allegation seriously because it implies criminal conduct.
Improper Execution
Every state has formal requirements for signing a will. Most states require the will to be in writing, signed by the testator (or by someone else at the testator’s direction and in their presence), and signed by at least two witnesses who saw either the signing or the testator’s acknowledgment of the signature. Some states also accept a will acknowledged before a notary as an alternative to witness signatures. Skip a step — one witness instead of two, witnesses who weren’t in the room, an unauthorized signature — and the will can fall on purely technical grounds.
Roughly half the states also recognize holographic wills, which are handwritten by the testator and typically need no witnesses. Those documents face heightened scrutiny over authenticity, and the exact requirements vary by state.
What a Will Contest Cannot Reach
Before spending money on a challenge, look at what the will actually controls. Life insurance policies, retirement accounts, payable-on-death bank accounts, and jointly held property pass directly to their named beneficiaries outside probate. Those beneficiary designations override anything the will says. If a retirement account names one person and the will names another, the retirement account beneficiary wins.
Invalidating the will has no effect on these transfers. Challenging a beneficiary designation is a separate civil action with its own rules, and it requires proving the same kinds of problems — fraud, undue influence, or lack of capacity — at the time the designation was made, not when the will was signed.
No-Contest Clauses and the Risk of Losing Everything
Many wills include a “no-contest” or “in terrorem” clause that penalizes anyone who challenges the document. The penalty is total: if you contest and lose, you forfeit your entire inheritance and are treated as if you predeceased the testator. A $200,000 bequest becomes zero.
Most states enforce these clauses but interpret them narrowly. The critical protection in the majority of states is the “probable cause” exception: if you had a reasonable, good-faith basis for the challenge — real evidence of incapacity or undue influence rather than a hunch — the clause won’t be enforced against you even if you lose. The exception doesn’t exist everywhere, and the standard for what qualifies varies. Filing without knowing your state’s rule is the most expensive mistake in probate litigation.
Filing Deadlines
Every state sets a deadline for contesting a will, and missing it permanently bars the claim. These windows typically run from a few months to two years after probate begins. Some states start the clock when the will is admitted to probate; others when you receive formal notice. Because the periods are unforgiving and vary significantly, pinning down your state’s exact rule is one of the first steps.
How the Case Moves Through Court
A contest begins by filing a petition — sometimes called a “caveat” — with the probate court handling the estate. The petition sets out who you are, your standing, and the grounds you’re asserting. Every interested party, including the executor and other beneficiaries, must be formally notified.
The case then enters discovery, where both sides exchange evidence. That includes written questions answered under oath, requests for documents like medical records and financial statements, and depositions in which witnesses answer attorneys’ questions on the record. Experts often play a central role: physicians or psychologists testify to mental state, and handwriting analysts appear in forgery claims. Discovery is where costs pile up and where cases are usually won or lost. A medical record showing the testator didn’t recognize family members the week they signed, or a financial trail leading to the alleged influencer, can decide the outcome.
Most contests never reach trial. Courts in many states encourage or require mediation, and families frequently reach a negotiated family settlement agreement that redistributes the estate. Once all interested parties sign, the agreement is filed with the court and becomes binding. Settlement often makes sense when the evidence is mixed, especially with a no-contest clause in play.
What It Costs
Estate litigation attorneys generally charge between $200 and $500 per hour, higher in major metropolitan areas. A contest that settles during discovery might cost tens of thousands of dollars. One that reaches trial with expert witnesses, multiple depositions, and contested medical evidence can exceed $100,000 per side. Add court filing fees (typically a few hundred dollars), process server costs, and expert witness fees running several thousand each.
You pay out of pocket unless you win and the court orders reimbursement from the estate, which is possible but not guaranteed. A $50,000 dispute that requires $80,000 in fees is a losing proposition regardless of outcome.
What Happens After a Ruling
Winning does not let you rewrite the will. If the defect affected only one provision, some courts will strike that provision and enforce the rest, provided the remaining terms still reflect a coherent plan the testator would have wanted. If the defect infected the whole document, the court throws it all out. The court then looks for the most recent prior valid will and reinstates it. If none exists, the estate becomes intestate and passes to the closest relatives under state law — spouse first, then children, then parents, then siblings, in an order that varies by state.
Losing means the original will stands and is distributed as written. You cover your own attorney fees, and in some states the court can order you to pay a portion of the estate’s legal costs if the challenge was found frivolous. If the will contained a no-contest clause and your state either doesn’t recognize the probable cause exception or finds you lacked it, you also lose what the will originally left you. That’s the outcome to weigh hardest before filing.