You can contest a trust in California if you have a direct financial stake in the outcome and a recognized legal ground, but you generally have only 120 days from the trustee’s formal notification to file your petition in probate court. Miss that window and the strongest case in the world will not save you. The rules on who can file, what you can argue, and how the process works are set by the Probate Code, and each piece has to line up before a court will take the case seriously.
Who Can File a Contest
California limits trust contests to anyone who qualifies as an “interested person,” meaning someone with a financial stake the court’s ruling would directly affect.1California Legislative Information. California Code PROB 48 – Interested Person That covers beneficiaries named in the current trust, beneficiaries under a prior version, heirs who would inherit under state intestacy law if the trust were invalidated, creditors with claims against the trust estate, and fiduciaries acting for any of those people.
The practical test: if the trust were thrown out or the challenged provision struck, would you receive something you are not currently getting? A child disinherited by a recent amendment who would have taken under the earlier version has standing. A relative who gets nothing either way does not. Standing is decided on the specific facts and can shift depending on which provision you are attacking.
The 120-Day Deadline
Once the settlor dies and the trust becomes irrevocable, the trustee must send formal notification to heirs and beneficiaries. From the date that notice is served on you, you have 120 days to file a contest. If you ask for a copy of the trust during that period and receive it, you get 60 days from delivery of the copy, if that falls later than the original deadline.2California Legislative Information. California Code Probate Code 16061.8
Courts enforce these deadlines strictly. One day late can permanently bar the claim no matter how strong the underlying evidence. If a trustee never sends the required notice, the clock may not start running, but sitting on a claim is still risky because general statutes of limitation can apply to stale disputes. Treat any notification from a trustee as a countdown that demands immediate attention.
You Usually Cannot Contest While the Settlor Is Alive
While a trust remains revocable and the settlor is alive and competent, the trustee’s duties run to the settlor, not to the beneficiaries, and beneficiaries have essentially no enforceable rights.3California Legislative Information. California Code Probate Code PROB 15800 The settlor can amend, revoke, or redirect assets at will. That makes contesting a revocable trust during the settlor’s lifetime impractical and, in most situations, legally impossible. Trust contests typically open after the settlor dies and the trust becomes irrevocable.
Grounds That Will Support a Contest
Unhappiness with your share is not a legal ground. A petition under Probate Code section 17200 can ask the court to determine whether a trust provision is valid, but it must identify at least one recognized basis.4California Legislative Information. California Code Probate Code 17200 Courts dismiss cases that are really just family disagreements about fairness.
Lack of Capacity
This is the argument that the settlor did not have the mental ability to understand what they were doing when they signed. The standard depends on how complex the document is. For a straightforward amendment that resembles a will, courts apply the testamentary capacity standard: did the settlor understand they were signing a legal document, recall the nature of their property, and recognize 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, courts apply a higher standard. The settlor must have been able to understand the rights and responsibilities the trust created, appreciate the probable consequences for themselves and others, and grasp the significant risks and alternatives.6California Legislative Information. California Code Probate Code 812 – Capacity to Make a Decision The more complicated the trust, the greater the mental capacity required. Someone might have had enough capacity to leave a house to a child in a simple amendment while lacking the capacity to restructure an elaborate estate plan.
Capacity cases turn on medical evidence. Records from every doctor, hospital, and specialist who treated the settlor near the time of signing are essential, and neurological records tend to be especially useful. The drafting attorney’s file can also show what happened in the room and whether anyone raised concerns about the settlor’s understanding at the time.
Undue Influence
Undue influence means someone pressured or manipulated the settlor into creating or changing the trust against their true wishes. Simple persuasion or even nagging is not enough. You have to show that a wrongdoer took advantage of the settlor’s vulnerability and that their actions caused the trust to reflect the wrongdoer’s wishes rather than the settlor’s.
Normally the person contesting the trust bears the burden of proof. California flips that burden in specific situations: when the trust makes a gift to certain categories of people, the law presumes the gift resulted from fraud or undue influence, and the beneficiary must disprove it by clear and convincing evidence.7California Legislative Information. California Code PROB 21380 Those 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, if the trust was signed during or close to that period of caregiving
- 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 person who actually drafted the trust or their close associates, the presumption is conclusive and cannot be overcome; the gift is automatically invalid.7California Legislative Information. California Code PROB 21380 For the other categories, the accused beneficiary can try to rebut the presumption. If they fail, they pay the costs of the proceeding, including reasonable attorney’s fees. Cases where this burden-shift applies look fundamentally different from cases where you have to prove everything yourself.
Fraud, Duress, and Improper Execution
Fraud applies when the settlor was deceived into signing, either told the document was something else or misled about key provisions. Duress means threats of physical harm coerced the signing. Improper execution means the trust was not signed or witnessed according to California’s formalities. These grounds tend to be more straightforward to prove when the evidence exists, but they come up less often than capacity or undue influence.
How to File
You start by filing a petition in the probate division of the Superior Court in the county with jurisdiction over the trust. The petition has to identify the specific legal grounds and lay out the factual basis for each. Vague allegations do not survive early motions, so plead with as much detail as the evidence allows.
After filing, you must formally serve notice on every interested party, including the trustee and all named beneficiaries. The trustee will typically hire counsel to defend the trust, and that defense is often paid from trust assets, which gives every beneficiary a financial stake in how the case plays out even if they take no active role. Discovery is usually extensive: subpoenas for medical records, the drafting attorney’s file, financial records, and communications between the settlor and the alleged wrongdoer are standard. The process can run for many months and costs climb quickly.
No-Contest Clauses
Many trusts include a no-contest clause warning that any beneficiary who challenges the trust and loses forfeits their inheritance. California law sharply limits how far these clauses reach. A no-contest clause can only be enforced against a direct contest brought without probable cause.8California Legislative Information. California Code Probate Code 21311 – No Contest Clause Probable cause exists if the facts known to you at the time of filing would lead a reasonable person to believe there is a reasonable likelihood the challenge will succeed after further investigation and discovery.
In plain terms, a legitimate claim will not cost you your inheritance even if you ultimately lose. Only a frivolous challenge, filed without any real factual support, triggers the penalty. That protection matters because a settlor who was genuinely manipulated may have had the clause inserted precisely to deter the people most likely to notice.
What a Successful Contest Actually Gets You
Winning does not always mean the whole trust disappears. Courts have several options. They can invalidate the entire trust, in which case assets pass under a prior valid version or, if none exists, under California’s intestacy laws as if no trust had been created. They can strike only the specific provisions tainted by incapacity, undue influence, or fraud and leave the rest intact. In some cases, courts reform the trust to better reflect what the settlor actually intended, correcting provisions that resulted from mistake or manipulation. Many contests end in settlement, because litigation is expensive, outcomes are uncertain, and attorney’s fees paid from both sides erode the estate quickly.
One reality worth sitting with before you file: invalidating a trust does not guarantee you receive what you expected. If the whole trust falls and no prior version exists, intestacy laws control, and they follow a rigid statutory formula based on family relationships. That formula may leave you with less than the contested trust would have given you. Map out what you would actually receive under each possible outcome before you commit to litigation.