How to Contest a Trust in California: Grounds and Steps

Here is how to contest a trust in California. After the person who made it dies, you file a petition in probate court asking a judge to throw out the trust or the amendment, on one of five grounds, inside 120 days of the trustee's formal notice (Probate Code §§ 17200, 16061.8). The five grounds are lack of capacity, undue influence, fraud, forgery or improper signing, and revocation.

Two things people get wrong. "Can you contest a trust" or "can you contest a living trust" is usually asked about a parent who is still alive, and the answer there is no, not while the parent is alive and competent. And a contest is a lawsuit with a fuse on it. The deadline does not care how strong your case is.

Around Silicon Valley most estates sit in living trusts, so the question that matters is how to contest a trust in California, not a will.

Who can contest a trust in California?

The Probate Code says "a trustee or beneficiary of a trust" may petition about the trust's internal affairs, including "the validity of a trust provision" (Probate Code § 17200). Read literally, that shuts out the child a late amendment cut out. In Barefoot v. Jennings the California Supreme Court held that someone removed by an amendment can challenge it as the product of incompetence, undue influence, or fraud.

Heirs never named have a path too; the Supreme Court left the question open in Barefoot. The trustee's death notice must go to "each heir of the deceased settlor" (Probate Code § 16061.7), and the 120-day contest deadline runs against everyone served (Probate Code § 16061.8). A statute that tells heirs when to file assumes they can.

Now the hard line. While the person who made the trust is alive and competent, the rights belong to that person, not to you (Probate Code § 15800). A beneficiary "lacks standing to challenge a trust" during that time, as the court put it in Drake v. Pinkham. Once she is no longer competent, the trustee owes you a copy of the trust and an accounting (Probate Code § 15800), and once she dies you can also sue the trustee for breaches committed while she was alive (Estate of Giraldin).

What are the grounds for contesting a trust in California?

The no-contest statute lists what a "direct contest" can rest on: forgery, lack of due execution, lack of capacity, "menace, duress, fraud, or undue influence," revocation, and disqualification of a caregiver or drafter (Probate Code § 21310). The last one lives inside undue influence below.

What is lack of capacity to make a trust?

Everyone is presumed to have capacity, and a diagnosis alone does not overcome that (Probate Code §§ 810, 811). You need evidence of a deficit in a mental function, and evidence tying that deficit to the document. For a simple amendment that reads like a will, the test is the low will standard: did she understand what the document does, what she owned, and who her family was (Probate Code § 6100.5; Andersen v. Hunt). A complex trust is judged on a sliding scale that rises with the complexity of the document (Lintz v. Lintz).

Example: Dad signs a one-page amendment leaving the Cupertino house to one child. Six weeks earlier a hospital chart notes he could not name the year or his own children. More in our guide to testamentary capacity in California.

What is undue influence over a trust?

Undue influence is "excessive persuasion" that overcomes a person's free will and produces an unfair result (Probate Code § 86; Welfare and Institutions Code § 15610.70). Courts weigh the victim's vulnerability, the influencer's authority, the tactics used, and the fairness of the result, and an unfair result alone is not enough. Where the beneficiary had a confidential relationship with the parent, actively procured the document, and benefits unduly, the burden flips to them (Rice v. Clark). For a caregiver of a dependent adult, the law presumes undue influence, rebuttable only by clear and convincing evidence. For the drafter it cannot be rebutted at all (Probate Code § 21380).

Example: a new "companion" drives Mom to a lawyer Mom has never met, sits in on the meeting, and walks out as sole trustee and sole beneficiary. Our guide to undue influence in California goes deeper on the proof. If the person who benefited was a caregiver or one sibling, read when a sibling or caregiver got everything.

What is fraud in making a trust?

Fraud is a lie that produced the document. The will statute says a document procured by fraud is ineffective (Probate Code § 6104), and Probate Code § 21310 makes it a ground against a trust too. Example: a son tells his father that his sister has been draining his accounts. A week later the trust is amended to cut her out. The father's mind was fine, but the facts he was given were not.

What counts as forgery or improper signing?

Sometimes the signature is not the settlor's. Sometimes it is, but the amendment was never signed or delivered the way the trust itself requires. Both are grounds (Probate Code § 21310). Example: a "2023 amendment" surfaces after the funeral, in a hand that does not match twenty years of signed checks.

What if the trust was revoked by a later document?

A revocable trust can be revoked by the method written into the trust (Probate Code § 15401). Unless the trust makes its method the only one, a signed writing delivered to the trustee while the settlor is alive also works. The ground: the document the trustee is enforcing was replaced by a later one the trustee is ignoring. Example: Mom signed a full restatement in 2022 and handed it to her son, the trustee. He is administering the 2015 version because it favors him.

Fixing a drafting mistake is not a contest. If Dad wanted his sons to split the house equally and the amendment's wording says otherwise, the petition is to reform the trust. The 120-day rule does not apply; a three-year limit does (Packard v. Packard).

How do you contest a trust in California, step by step?

1. File the petition. A trust contest is a petition under Probate Code § 17200 asking the court to decide the validity of a trust provision. It is filed in the county where the trustee handles the trust's day-to-day business (Probate Code §§ 17005, 17002). For a trustee in San Jose, Sunnyvale, or Palo Alto, that is the probate court in San Jose, the Santa Clara County Superior Court. One judge is assigned to the case for all purposes.
2. Serve notice. Every trustee and beneficiary gets notice at least 30 days before the hearing (Probate Code § 17203). The other side files a written response. The first hearing is short; the judge sets a schedule and decides nothing.
3. Discovery. Probate proceedings follow the civil discovery rules (Probate Code § 1000). The case gets built here: medical records, the drafting attorney's file, bank and phone records, and depositions of the caregiver and the notary.
4. Settlement conference. The probate court in San Jose runs an Early Settlement Conference Program: the parties sign a court form and a neutral from the court's roster sits everyone down (Probate Local Rule 3B). The rule says it is not a confidential mediation, so watch what you say in the room. Most contests settle here or soon after.
5. Trial. A judge, not a jury, decides (Probate Code § 825). Cases that go the distance typically run twelve to twenty-four months from filing, and that is typical, not promised.

Does a no-contest clause mean you lose your inheritance?

Most California trusts have a no-contest clause: challenge the trust and you forfeit whatever it gives you. Here's the thing. California enforces those clauses only against a direct contest "brought without probable cause" (Probate Code § 21311). Probable cause means the facts you knew at filing would lead a reasonable person to think there was a reasonable likelihood of winning after discovery.

The trap is timing. In Meiri v. Shamtoubi a daughter filed her contest several months after the 120-day deadline. A contest filed too late cannot win, so by definition it was filed without probable cause, and the clause took her entire share. File on time with a real basis and the clause is mostly noise. File late and it is a guillotine.

How much does it cost to contest a trust in California?

It depends on how far the case goes, and nobody can quote you a number at the first conversation. Lawyers in this field bill by the hour or, in some cases, take a percentage of what is recovered; we talk through which fits when we first meet.

The other side may not be paying at all. When the trust directs the trustee to defend the estate plan, a court can let the trustee spend trust money on lawyers while your contest is pending (Doolittle v. Exchange Bank). Where the fight is really between two sets of beneficiaries and nobody attacks the trust itself, the same opinion says the trustee must stay neutral. Our guide to whether a trustee can use trust funds to pay attorney fees covers the line.

Ask whoever you talk to how many trust contests they have taken through trial.

What are the deadlines to contest a trust in California?

Filing is what stops the clock: not a letter, not a phone call, not serving the papers (Straley v. Gamble). Count from the day the notice was mailed, not the day you opened it (Probate Code § 1215). What that letter must contain is in our guide to the notification by trustee. Wills and the one-year rule for claims against someone who has died are covered in how long you have to contest a trust or will. The deadline wizard will give you a date.