Contesting a Will: Grounds, Process & What to Expect

To make a valid will, a testator must have testamentary capacity at the moment of signing — a specific, relatively low legal standard. Courts require the testator to have understood: (1) that they were making a will; (2) the general nature and extent of their property; (3) the natural objects of their bounty (who their family members are); and (4) how the will distributes their property among those people.

Important nuance: The capacity standard is surprisingly low. Someone with mild to moderate dementia, mental illness, or other cognitive impairment may still have testamentary capacity. What matters is their mental state at the specific moment they signed the will — not their general condition. A person with advanced Alzheimer's may have a "lucid interval" during which they legally have capacity. Courts frequently find capacity even in people with significant health issues.

What's often confused with incapacity: Eccentricity, old age, physical infirmity, medication effects, general forgetfulness, or making an unwise distribution are not evidence of incapacity by themselves. The bar is whether the testator met the four-part test above — not whether they made the "right" choices.

Undue influence occurs when someone in a position of trust or power overcomes the testator's free will — causing them to sign a will that benefits the influencer rather than reflecting the testator's genuine wishes. It is the most frequently alleged ground in will contests, and also one of the hardest to prove because the influence is rarely explicit or documented.

Courts typically look for four elements: the alleged influencer had opportunity (was frequently alone with the testator, especially toward the end of life); the testator was susceptible to influence (due to age, physical or cognitive decline, dependency, or isolation); the influencer had motive (stood to gain under the will); and the will itself shows the effect of influence (makes gifts the testator would not otherwise have made — often a dramatic, unexplained change from prior wills).

Red flags courts take seriously: A caregiver who is also named a primary beneficiary; the testator was isolated from family before the will was signed; the beneficiary accompanied the testator to the attorney's office and participated in the drafting; the will was changed dramatically (or for the first time) very close to death; or the testator expressed different intentions to family members or other advisors.

Presumption of undue influence: In many states, a presumption of undue influence arises automatically when a confidential relationship existed between the testator and the beneficiary (parent-adult child, patient-caregiver, principal-attorney) and the beneficiary actively participated in the will's preparation. This shifts the burden — the beneficiary must prove the will was the testator's free choice, rather than the contestant having to prove influence.

Fraud occurs when the testator was deceived into signing a will — either by misrepresenting what the document was ("this is just a power of attorney") or by presenting false facts that induced them to change their estate plan. Forgery means the testator's signature was fabricated or the will was otherwise created without their knowledge or participation.

Fraud and forgery are the clearest grounds for invalidation — if proven, there is no argument on the other side. But they require strong evidence. Document examiners (handwriting experts), notary records, and witness testimony are typically essential. Forensic analysis of the document itself (paper dating, ink analysis, digital metadata for electronic wills) can provide compelling objective evidence.

Fraud in the inducement is a related theory: someone told the testator false facts ("your son is in prison and wants nothing from you" when untrue) that caused them to change their will in a way they would not have chosen with accurate information. This requires showing both the false representation and that the testator relied on it.

Every state has specific formal requirements for a valid will: it must be in writing, signed by the testator, and witnessed by a minimum number of witnesses (usually two) who are not beneficiaries, in the testator's presence. If these requirements weren't met — even in a technically minor way — the will may be entirely invalid.

Common execution defects: a witness who is also a beneficiary (in states that void bequests to interested witnesses); fewer than the required number of witnesses; witnesses who didn't actually observe the testator sign (they signed a blank page later); the will was signed in one sitting but witnesses signed on a different day; or the testator signed initials rather than their full signature in a state requiring full signature.

Harmless error doctrine: Several states (including Colorado, Hawaii, Michigan, and others that follow UPC §2-503) have adopted a "harmless error" or "dispensing power" rule that allows courts to treat a defectively executed will as valid if there is clear and convincing evidence the testator intended it as their will. This significantly limits the usefulness of execution defect challenges in UPC states — but in non-UPC states, technical defects can be fatal to the will's validity. Source: Uniform Probate Code §2-503.

A will can be revoked by: (1) executing a new will that expressly revokes all prior wills; (2) a written revocation signed with the same formalities as a will; or (3) physical destruction — burning, tearing, or obliterating the will with the intent to revoke it. If the will being admitted to probate was previously revoked by any of these methods, it is no longer valid — even if it was later "found" by someone who claims it's the real will.

Lost will presumption: In most states, if an original will cannot be found after the testator's death, there is a rebuttable presumption that the testator destroyed it with intent to revoke. This can work against or in favor of a contestant — if a prior, more favorable will existed but can't be found, courts will presume it was revoked.

Dependent relative revocation: A legal doctrine that allows courts to disregard a revocation made under a mistake — if the testator revoked the old will believing a new will was valid, but the new will turns out to be invalid, the court may revive the old will rather than having the testator die intestate. This is a complex doctrine requiring attorney guidance.