Contesting a Will in California: Grounds, Deadline, and Proof

Contesting a will in California means filing a written objection in probate court, usually within 120 days after the will is admitted to probate, and proving one of a short list of legal grounds: lack of testamentary capacity, undue influence, fraud, duress, mistake, improper execution, or revocation. Only people with a direct stake in the estate can file, the evidence has to be real rather than suspicious, and the process is expensive enough that most cases either settle or should never have been started. What follows is what you need to decide whether a contest makes sense, and how to bring one if it does.

Who Can File

California limits will contests to “interested persons.” That category includes heirs, beneficiaries under a prior will, surviving spouses, children, creditors, and anyone else with a property right in or claim against the estate.¹ In practice, the people who actually file are disinherited children, surviving spouses who received less than expected, and beneficiaries named in an earlier version of the will that was replaced shortly before the decedent died.

If you are not an heir under California’s intestacy laws and are not named in any version of the will, you almost certainly lack standing. Creditors technically qualify, but they recover through the claims process, not a contest.

The 120-Day Deadline

Timing is the single biggest procedural trap. Once the court admits the will to probate and the clerk mails formal notice, you generally have 120 days to file a contest. Miss the deadline and the court will refuse to hear the case no matter how strong your evidence is.

The contest begins when you file a written objection to probate in the court handling the estate. The objection has to identify the specific legal grounds you are raising. After it is filed, the court issues a summons directing the relevant parties to respond within 30 days.² Discovery follows: depositions, subpoenas for medical and financial records, sometimes expert testimony from physicians or forensic document examiners. That phase usually takes months and drives most of the cost. Many California courts push the parties into mediation before trial, and a large share of contests settle there.

Grounds That Actually Work

California Probate Code section 8252 lists the grounds a contestant can raise: lack of testamentary intent or capacity, undue influence, fraud, duress, mistake, or revocation.³ You don’t need all of them. A successful challenge on any one can invalidate the will.

Lack of Testamentary Capacity

This is the ground people raise most often. Under California law, a person lacked the mental competence to make a will if, at the time of signing, they could not understand what making a will means, could not recall the nature and extent of their property, or could not remember their relationships with the people affected by it. A second path applies when delusions or hallucinations directly caused the person to distribute property in a way they otherwise would not have.⁴

The bar is lower than people expect. Early-stage dementia, forgetting conversations, or needing help with daily tasks does not automatically mean incapacity. What matters is the decedent’s mental state at the specific moment they signed. Medical records, physician testimony, and observations from people who interacted with the decedent around that date are the evidence that decides these cases.

Undue Influence

Undue influence is pressure heavy enough to override the decedent’s free will and substitute someone else’s wishes. California courts describe it as pressure that “destroys the testator’s free agency.”⁵ Ordinary persuasion, affection, and even persistent nagging do not qualify. The influence has to amount to coercion aimed at the act of making the will.

A contestant can trigger a presumption of undue influence by showing three things together: a confidential or trust-based relationship between the accused person and the decedent, active participation by that person in preparing or procuring the will, and a disproportionate benefit to that person.⁵ Once the presumption arises, the burden shifts to the beneficiary to prove the will was made freely. Most undue influence cases turn on whether the contestant can get to that presumption.

Fraud

Fraud covers deception that caused the decedent to sign something they did not intend. Typical examples: misrepresenting what the document says, lying about a family member’s conduct to turn the decedent against them, or forging the signature. Fraud often overlaps with undue influence when the deception is part of a broader manipulation.

Mistake or Improper Execution

A factual mistake, such as the decedent believing a child had died when they were still alive, can invalidate the affected provisions if you can show the mistake actually shaped the will’s terms. Drafting errors that omit a beneficiary or misstate an asset can do the same.

Improper execution is a related but distinct ground. California requires the will to be signed by the person making it and witnessed by at least two people present at the signing. Failure to follow those formalities can void the entire document.

Revocation

You can also challenge a will by showing the decedent revoked it, either by executing a later will that supersedes it or by physically destroying the earlier one with intent to revoke. When a contest is based on a later will, the court decides whether that later version is entitled to probate before it addresses the earlier one.³

Who Has to Prove What

The party defending the will, usually the executor or named beneficiaries, has to prove the will was properly executed. You, the contestant, carry the burden on everything else: capacity, undue influence, fraud, revocation.³ For most grounds the standard is a preponderance of the evidence, meaning more likely than not. Clear and convincing evidence is a higher bar that applies to specific claims like elder abuse disqualification, not to standard will contest grounds.

Capacity and undue influence are the hardest grounds to prove because the key witness, the decedent, is gone. Cases tend to turn on circumstantial evidence: how isolated the decedent was, who controlled access to them, how dramatically the will departed from prior versions, and what the medical records show in the months around the signing.

What a No-Contest Clause Really Does Here

Many California wills and trusts contain a no-contest clause (sometimes called an “in terrorem” clause) threatening to cut off any beneficiary who challenges the document. California has significantly narrowed how far those clauses reach.

Under current law, a no-contest clause is enforceable only against a direct contest brought without probable cause.⁶ A “direct contest” is a challenge alleging invalidity on grounds like forgery, lack of execution, lack of capacity, fraud, or undue influence.⁷ “Probable cause” means a reasonable person, knowing the facts you knew when you filed, would believe there was a reasonable likelihood of success.

The practical result: a legitimate challenge will not cost you your inheritance even if you ultimately lose. A challenge filed on speculation or spite can. This safe harbor is one of the more contestant-friendly rules in the country, and it means the threat printed in a California will carries far less weight than most families assume.

Simpler Paths Than a Full Contest

Before filing a contest, check whether a narrower statutory remedy fits your situation. Two of them cover the most common family scenarios and don’t require you to prove anything was wrong with the will itself.

If the decedent married after signing the will and never updated it, the surviving spouse is treated as “omitted” and automatically entitled to the decedent’s half of community and quasi-community property, plus up to half of the decedent’s separate property.⁸ The rule does not apply if the omission was intentional, if the spouse was provided for outside the will, or if the spouse waived the right in a valid pre- or postnuptial agreement.

A parallel rule protects children born or adopted after the last will was signed. An omitted child receives what they would have inherited under intestacy, unless the omission was clearly intentional based on the will’s language, the decedent left substantially everything to the child’s other parent, or the child was provided for through a trust, life insurance, or similar arrangement.⁹ An omitted spouse or child petitions the court directly for their statutory share; no fraud or incapacity showing required.

There is also a separate mechanism for abuse cases. Under Probate Code section 259, a person who committed physical abuse, neglect, or financial abuse against an elder or dependent adult can be treated as having predeceased the decedent, cutting them out of any inheritance. It requires clear and convincing proof that the person acted in bad faith and that the conduct was reckless, fraudulent, or malicious, and that the decedent was substantially unable to manage their finances or resist undue influence when the abuse occurred and until death.¹⁰ A disqualified person cannot inherit under the will, serve as executor, or benefit from any instrument the decedent signed during the period of vulnerability. Section 259 can run alongside a contest or stand on its own.

If You Win, What You Actually Get

Winning does not automatically hand the estate to you. The outcome depends on what is left after the invalid will is set aside.

If the decedent left an earlier will that was never revoked, the court may probate that version instead, and its terms control.
The court can strike down specific provisions while leaving the rest intact. If a single clause was the product of undue influence, the remainder of the will can still stand, and the invalidated portion passes as if no will existed for that property.
If no prior valid will exists and the whole document is thrown out, the estate passes under California’s intestacy laws. A surviving spouse receives all community property and a share of separate property that depends on whether the decedent left children or other close relatives; whatever does not go to the spouse passes first to children, then parents, then siblings and their descendants, down the statutory list.¹¹¹²

Intestacy often produces results no one in the family wanted, which is a big part of why contestants often prefer to settle rather than push for total invalidation.

If You Lose

If the court upholds the will, the estate is distributed exactly as written. You receive whatever it provides for you (which may be nothing) and absorb your own litigation costs. If the will has a no-contest clause and the court finds you filed without probable cause, you forfeit any bequest you would otherwise have received.⁶

You can appeal if you believe the trial court made a legal error, but appellate review is limited to questions of law, not fresh factual disputes. Appeals add months or years and carry their own costs.

Cost, Fees, and the Family Reality

Will contests are among the most expensive kinds of probate litigation. Your attorney’s fees come out of your own pocket unless you win and the court orders reimbursement from the estate. The executor’s fees for defending the will are typically paid by the estate, since the executor has a fiduciary duty to carry out its terms, though nothing gets paid until the case ends.

For federal estate tax purposes, attorney’s fees and litigation costs from a will contest may be deductible as administration expenses, but only if they were actually necessary to settle the estate: collecting assets, paying debts, distributing property. Fees a beneficiary runs up purely to fight for a larger share are not deductible even if a probate court approves them as payable by the estate.¹³

The other cost is harder to measure. Contested probate proceedings are public, adversarial, and personal. Families that go through them often don’t fully recover, which is why experienced probate attorneys push hard for mediation before trial, and why it’s worth being honest with yourself about your evidence before you file.

1
California Legislative Information. California Probate Code 48 – Interested Person
2
California Legislative Information. California Probate Code 8250 – Contest of Will
3
California Legislative Information. California Probate Code 8252 – Trial of Contested Issues
4
California Legislative Information. California Probate Code 6100.5 – Individuals Not Mentally Competent to Make a Will
5
Justia Law. Estate of Sarabia (1990)
6
California Legislative Information. California Probate Code 21311 – Enforcement of No Contest Clause
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California Legislative Information. California Probate Code 21310 – Definitions
8
California Legislative Information. California Probate Code 21610 – Omitted Spouse
9
California Legislative Information. California Probate Code 21620-21621 – Omitted Children
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California Legislative Information. California Probate Code 259 – Elder Abuse Disqualification
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California Legislative Information. California Probate Code 6401 – Intestate Share of Surviving Spouse
12
California Legislative Information. California Probate Code 6402 – Intestate Succession
13
eCFR. 26 CFR 20.2053-3 – Deduction for Expenses of Administering Estate