Key Takeaways

• Trust litigation is how disputes over a California trust get resolved in probate court — most often through a petition under Probate Code section 17200.
• Common disputes: removing a trustee, breach of fiduciary duty, compelling an accounting, contesting the trust, and fights among beneficiaries.
• A trustee or beneficiary can petition; recent decisions have broadened who counts as a beneficiary with standing to sue.
• Deadlines are real — notably the 120-day window to contest a trust after the statutory notice.
• Most trust disputes settle, often through mediation, but the credible ability to litigate is what drives fair resolutions.

What Trust Litigation Is

A living trust is supposed to make settling an estate smoother than probate — private, faster, no court supervision. Usually it does. But when something goes wrong — a trustee who won’t account, a suspicious last-minute amendment, a beneficiary who believes they’re being cheated — the trust ends up in court anyway. That’s trust litigation: the process of resolving disputes over a trust’s validity, its administration, or its distribution, in California’s probate courts.

These disputes are among the most consequential in estate law. They decide who controls a trust, who inherits, whether a trustee is held personally responsible, and sometimes whether a trust stands at all. They’re also frequently family conflicts, which makes them emotionally charged on top of being legally complex. Whether you’re a beneficiary who suspects wrongdoing or a trustee facing accusations, understanding how trust litigation works is the first step to navigating it.

The §17200 Gateway

Most California trust disputes enter the court the same way: a petition under Probate Code section 17200. This statute is the workhorse of trust litigation. It lets a trustee or beneficiary ask the probate court to resolve almost any matter concerning the trust’s “internal affairs,” and it lists a long menu of things the court can do, including:

• Interpreting ambiguous trust terms
• Determining whether a trust provision is valid
• Settling the trustee’s accounts and reviewing the trustee’s actions
• Compelling the trustee to account or to provide information
• Removing or appointing a trustee
• Ordering a trustee to repair harm to the trust
• Approving a modification or termination of the trust

Because section 17200 is so broad, it’s the entry point for most of the specific disputes covered across this site. When you read about removing a trustee or compelling an accounting, the underlying vehicle is almost always a section 17200 petition. Our dedicated guide on the §17200 petition explains how it works in detail.

The Common Trust Disputes

Trust litigation tends to cluster around a handful of recurring conflicts:

• Removing a trustee. Beneficiaries believe the trustee is mishandling the trust and petition to remove them.
• Breach of fiduciary duty. The trustee violated their duties — self-dealing, mismanagement, favoritism — and beneficiaries seek to hold them personally liable.
• Compelling an accounting. The trustee won’t show beneficiaries what’s happening with the trust’s money, so they petition to force an accounting.
• Contesting the trust. Someone challenges the trust’s validity — arguing the settlor lacked capacity, was unduly influenced, or that an amendment is invalid. See how to contest a trust.
• Beneficiary disputes. Co-beneficiaries (often siblings) disagree over distributions, interpretation, or the trustee’s conduct.
• Financial elder abuse and wrongful taking. Someone exploited the settlor or took trust property — claims that can carry double damages.

Each has its own elements, evidence, and strategy, and many cases involve several at once — a contest paired with a removal petition and a fiduciary-breach claim, for instance.

Facing a trust dispute and not sure where you stand? An early, candid assessment can save enormous cost and stress. Bay Legal handles trust and estate litigation throughout California, for beneficiaries and trustees alike. For guidance on your specific situation, call (650) 668-8000 or schedule a consultation at baylegal.com/contact.

Two Sides of Every Trust Dispute

Trust litigation always has (at least) two sides, and Bay Legal works both:

• The beneficiary side. Beneficiaries who suspect a trustee is mishandling the trust, who were cut out by a questionable amendment, or who can’t get information they’re entitled to. Their tools are the petitions above — to compel, to remove, to surcharge, to contest.
• The trustee side. Trustees — often a family member who agreed to serve and now faces accusations — need a defense. Not every beneficiary complaint is meritorious; trustees are entitled to reasonable compensation, to exercise legitimate discretion, and to defend their administration. A trustee facing a removal petition or a breach claim needs counsel as much as the beneficiary bringing it. See our guide on defending a trustee.

Understanding both perspectives matters even if you’re firmly on one side, because anticipating the other side’s position is how disputes get resolved — or won.

Who Can Sue: Standing

A threshold question in any trust dispute is standing — whether the person bringing the claim has the legal right to. Section 17200 says a “trustee or beneficiary” may petition. For years that raised a hard question: what about someone a suspicious amendment cut out of the trust, or an heir who was never named but claims the whole trust is invalid?

California courts have answered in favor of broader access. The California Supreme Court has held that someone who would be a beneficiary if a challenged amendment were invalidated has standing to bring their challenge in probate court — you don’t lose the right to contest a trust just because the very document you’re attacking says you’re no longer a beneficiary. More recent appellate authority has extended standing further, to certain heirs who would inherit if the trust were invalid. The practical effect is that a fairly broad class of “putative beneficiaries” can get into probate court to challenge a trust — though the precise contours keep developing, which is one reason to get current advice. Our guide on who can contest a trust covers standing in depth.

Deadlines and Why They Matter

Trust litigation runs on deadlines, and missing one can be fatal — or worse than fatal. The most important: when a revocable trust becomes irrevocable on the settlor’s death, the trustee serves a statutory notice, and recipients generally have 120 days from that notice to contest the trust. Miss it, and the contest is barred. And because a late contest is treated as lacking probable cause, missing the deadline can even trigger a no-contest clause and cost a beneficiary their inheritance. The lesson is the same one that runs through all of trust litigation: if you think you have a dispute, act quickly and get advice before the clock runs.

The 120-day contest deadline is unforgiving, and missing it can be costly. If you’ve received a trust notice and have concerns, don’t wait. Bay Legal can assess your options. For guidance on your specific situation, call (650) 668-8000 or schedule a consultation at baylegal.com/contact.

How These Disputes Get Resolved

Trust disputes are resolved through the probate court — petitions, discovery, hearings, and sometimes trial (generally without a jury). But the reality is that most trust litigation settles before trial, frequently through mediation, which is faster, cheaper, and more private than a courtroom fight, and often better for families. The strongest position in any settlement comes from being genuinely prepared to litigate — which is why building the case carefully matters even when the goal is resolution.

How This Fits Together

This overview is the gateway to the specific guides across this site: removing a trustee, breach of fiduciary duty, compelling an accounting, contesting a trust, beneficiary rights, modifying a trust, and defending a trustee. For the rights that anchor most disputes, see our companion hub on beneficiary rights in a California trust.

Frequently Asked Questions

What is trust litigation in California?

It’s the process of resolving disputes over a trust — its validity, administration, or distribution — in California’s probate courts, most often through a petition under Probate Code section 17200. Common disputes include removing a trustee, breach of fiduciary duty, compelling an accounting, and contesting the trust.

How do you sue a trustee in California?

Generally by filing a petition under Probate Code section 17200 in probate court, asking the court to compel an accounting, surcharge the trustee for losses, remove them, or order other relief. A beneficiary (and, increasingly, certain putative beneficiaries) has standing to bring such a petition.

Who can bring a trust dispute to court?

A trustee or beneficiary can petition under section 17200. California courts have broadened this to include “putative beneficiaries” — for example, someone disinherited by a challenged amendment, or certain heirs who would inherit if the trust were invalid.

What is the deadline to contest a trust in California?

Generally 120 days from the date the trustee serves the statutory notice that the trust has become irrevocable (or 60 days from receiving a copy of the trust terms, if later). Missing it usually bars the contest and can trigger a no-contest clause.

Do trust disputes go to trial?

Some do, but most settle — often through mediation — because litigation is costly, slow, and hard on families. Probate matters that do reach trial are generally tried without a jury.