To contest a trust in California, you must be an “interested person” with a financial stake in the outcome, you must have a recognized legal ground such as lack of capacity, undue influence, fraud, duress, or improper execution, and you generally must file your petition within 120 days after the trustee sends you formal notification that the trust has become irrevocable. Miss any one of those requirements and the challenge fails before the court reaches the merits.
Who Can File a Trust Contest
California limits trust contests to people the Probate Code calls an “interested person.” That means anyone with a financial stake that would be directly affected by the outcome: beneficiaries under the current trust or a prior version, heirs who would inherit under state law if the trust were invalidated, creditors with claims against the trust estate, and fiduciaries acting on behalf of any of those people.1California Legislative Information. California Code PROB 48 – Interested Person
The practical test is simple. If the trust were thrown out or the provision you’re challenging were struck, would you receive something you are not currently getting? A child disinherited by a late amendment who would have taken under the previous version has standing. A distant relative who inherits nothing either way does not. Standing can also shift depending on which specific provision you attack, so it’s worth mapping out before filing.
The 120-Day Deadline
After the settlor dies and the trust becomes irrevocable, the trustee is required to send formal notification to heirs and beneficiaries. From the date that notification is served on you, you have 120 days to file a contest. If you request the trust document during that window and receive it, you get 60 days from delivery of the copy when that date falls later than the original 120-day deadline.2California Legislative Information. California Code Probate Code 16061.8
The deadline is strict. Missing it by a single day permanently bars the claim, no matter how strong the underlying evidence. If the trustee never sends the required notification, the 120-day clock may not start, but sitting on the case is still dangerous because general statutes of limitation can catch stale claims. Treat any notification from a trustee as a countdown that starts the moment you open the envelope.
A Note on Living Settlors
While a revocable trust’s creator is still alive and competent, beneficiaries have almost no enforceable rights. The trustee’s duties run to the settlor, not to the people named in the document.3California Legislative Information. California Code Probate Code PROB 15800 The settlor can change or revoke the trust at any time, and a contest brought by a beneficiary during this period is generally impossible. Challenges tied to an incapacitated living settlor typically move through conservatorship proceedings instead, which is a separate legal path.
Grounds That Actually Work
Unhappiness with your share is not a ground. A petition must identify a specific legal basis, and courts dismiss cases that read as family disagreement about fairness.4California Legislative Information. California Code Probate Code 17200
Lack of Capacity
Capacity means the settlor had the mental ability to understand what they were doing. The standard California applies depends on how complicated the trust is. For a simple amendment that looks much like a will, courts use the testamentary standard: whether the settlor understood they were signing a legal document, could recall the nature of their property, and recognized the people affected by their decisions.5California Legislative Information. California Probate Code 6100.5 – Individual Not Mentally Competent to Make a Will For complex trusts involving business structures, tax planning, or sophisticated asset management, the standard is higher: the settlor must have been able to understand the rights and responsibilities created by the trust, appreciate the probable consequences, and grasp the significant risks and alternatives.6California Legislative Information. California Code Probate Code 812 – Capacity to Make a Decision
Capacity cases turn on medical evidence. Records from every doctor, hospital, and specialist who saw the settlor near the signing date matter, and neurological records tend to be the most useful. The drafting attorney’s file also matters, because it often shows the circumstances of the signing and whether anyone flagged concerns about the settlor’s understanding at the time.
Undue Influence
Undue influence means someone pressured or manipulated the settlor into signing a trust that reflects the wrongdoer’s wishes rather than the settlor’s own. Ordinary persuasion isn’t enough. The contestant must show that a wrongdoer exploited the settlor’s vulnerability and that this behavior directly produced the disputed provisions.
The contestant normally carries the burden of proof. California flips it in a specific set of cases. When a trust gives to certain categories of people, the law presumes fraud or undue influence, and the beneficiary must rebut that presumption by clear and convincing evidence.7California Legislative Information. California Code PROB 21380 The triggering categories include:
- The person who drafted or prepared the trust document
- A care custodian who provided health or social services to the settlor as a dependent adult, when the trust was signed during or close to the caregiving period
- A fiduciary who transcribed the trust
- Close relatives, cohabitants, or employees of the drafter or care custodian
- Partners or employees of the drafting attorney’s law firm
For gifts to the actual drafter or their close associates, the presumption is conclusive and cannot be overcome; the gift is automatically invalid. For the other categories, the accused beneficiary can try to rebut with clear and convincing evidence, and if they fail, they pay the costs of the proceeding, including reasonable attorney’s fees. When this presumption applies, the case looks fundamentally different from one where the contestant has to prove everything from scratch.
Fraud, Duress, and Improper Execution
Fraud covers situations where the settlor was deceived, told the document was something else, or misled about key provisions. Duress involves threats of physical harm that coerced the signing. Improper execution means the trust was not signed or witnessed the way California law requires. These grounds tend to be more straightforward to prove than capacity or undue influence when the evidence exists, but they come up less often.
How to File
The contest begins with a petition filed in the probate division of the California Superior Court in the county with jurisdiction over the trust. The petition must state the specific legal grounds and the facts supporting them. Vague allegations do not survive early motions to dismiss, so the petition should be as detailed as the available evidence allows.
Once filed, formal notice must be served on every interested party, including the trustee and all named beneficiaries. The trustee will usually retain counsel to defend the trust, and the cost of that defense typically comes out of trust assets. That means every beneficiary has money at stake even if they never enter the courtroom.
Discovery in trust litigation is extensive. Subpoenas for medical records, the estate planning attorney’s file, financial institution records, and communications between the settlor and the alleged wrongdoer are all standard. In capacity cases, expert witnesses such as geriatric psychiatrists or neuropsychologists often testify about the settlor’s mental state at the time of signing. The process takes months, sometimes longer, and costs climb quickly.
No-Contest Clauses
Many trusts include a no-contest clause warning that any beneficiary who challenges the trust and loses will be disinherited entirely. These clauses are designed to scare off lawsuits, and they can look intimidating on the page. California law limits their reach substantially.
A no-contest clause is enforceable against a direct contest only when the contest was brought without probable cause.8California Legislative Information. California Code Probate Code 21311 – No Contest Clause Probable cause exists when the facts known to the contestant at the time of filing would lead a reasonable person to believe the challenge has a reasonable likelihood of succeeding after further investigation and discovery. If you have a genuine basis for the claim, the clause will not strip your inheritance even if you ultimately lose. Only a frivolous filing, one with no real factual support, triggers the penalty. That protection is important because a settlor who was actually subjected to undue influence may have had the clause inserted precisely to deter the people most likely to notice.
What a Successful Contest Actually Produces
Winning does not always mean the whole trust vanishes. A court has several options depending on what was proven and which provisions were affected. It can invalidate the entire trust, in which case assets pass under a prior valid version if one exists, or under California’s intestacy laws if none does. It can strike only the specific provisions tainted by incapacity, undue influence, or fraud and leave the rest of the trust intact. In some cases it will reform the trust to better reflect what the settlor actually intended.
Many trust contests end in settlement. Litigation is expensive, outcomes are uncertain, and trust value erodes quickly when both sides are paying attorneys from it.
One thing to weigh before filing: invalidating a trust does not guarantee you end up with what you expected. If the entire trust is thrown out and no prior version exists, intestacy controls, and that formula is rigid and based purely on family relationships. It may hand you less than the contested trust would have. Map out what you would actually receive under each possible outcome before you commit to the fight.