Trustee Breach of Fiduciary Duty in California

A trustee breaches their fiduciary duty in California when they put their own interests ahead of the beneficiaries’, mismanage trust assets, or fail to administer the trust the way the document and the law require. It’s not a technicality. It’s a legal violation with consequences that can include personal financial liability, removal, and denial of compensation.

A trustee isn’t just holding property. They’re holding it for someone else, under a duty California law spells out in detail and enforces when it’s broken.

What does fiduciary duty actually require of a trustee?

A California trustee’s core obligations come from the Probate Code and from the trust document itself, and they cover more ground than most people expect going in.

Duty of loyalty

The trustee has to act solely in the beneficiaries’ interests, not their own. Everything else in trust administration sits on top of this one. A trustee who is weighing what’s good for the trust against what’s good for themselves has already gotten the question backward.

Duty to avoid conflicts of interest

A trustee can’t buy trust property for themselves, sell trust assets to family members below market value, or enter into transactions where their personal interest competes with the beneficiaries’. Even a transaction that turns out fine on paper can be a breach if the conflict itself wasn’t properly disclosed and addressed.

Duty to administer the trust according to its terms

The trust document is the instruction manual. A trustee who departs from it without court approval, even with good intentions, has breached their duty. “I thought it made more sense this way” isn’t a defense when the document said otherwise.

Duty to keep beneficiaries reasonably informed

Beneficiaries are entitled to information about the trust’s administration and assets, including a formal accounting on request. A trustee who goes quiet for long stretches, or answers questions with vague reassurances instead of documents, is falling short of this duty.

Duty of prudent administration

Trustees have to manage trust assets with the care a reasonably prudent person would use managing someone else’s property, which generally includes reasonable diversification. Parking trust funds in a single volatile stock, or leaving a depreciating asset in place indefinitely, doesn’t meet that standard.

Duty to enforce and defend claims

Trustees have to protect trust property from claims against it and pursue claims that would benefit the trust. A trustee who lets a valid claim in the trust’s favor lapse, or who fails to defend the trust against a bogus one, isn’t doing the job.

What does a breach actually look like in practice?

Breach of fiduciary duty shows up in a handful of recurring patterns, and most trust disputes I see fit into one or more of them.

Self-dealing

This includes excessive trustee fees, personal expenses paid out of trust funds, and transferring trust assets to the trustee or their family. It’s the most direct form of breach, because the trustee is using their position to benefit themselves at the trust’s expense.

Favoritism among beneficiaries

Uneven distributions made without authority under the trust, or a pattern of delaying one beneficiary’s share while accommodating another’s, both point to a trustee who has stopped treating beneficiaries even-handedly. The trust document sets the rules on distributions. The trustee doesn’t get to rewrite them based on who they like better.

Mismanagement of investments

Holding a single volatile stock position, refusing to sell a depreciating asset, or making speculative investments inconsistent with the trust’s stated purpose all point toward a breach of the duty of prudent administration.

Commingling funds

Mixing trust assets with the trustee’s personal accounts makes tracking money nearly impossible and opens the door to misuse, intentional or not. Even without proof of theft, commingling itself is a breach.

Failure to account

Ignoring a beneficiary’s request for an accounting, or producing one that’s incomplete, vague, or late, is itself a form of breach. See our page on compelling a trust accounting for how to force the issue.

Concealing information

Failing to notify beneficiaries of their rights, of the trust’s existence, or of significant transactions affecting trust assets is a breach in its own right, separate from whatever underlying misconduct the trustee may be hiding.

What can beneficiaries do about a suspected breach?

An accounting is usually the starting point. California Probate Code section 16062 requires the trustee to account, and what comes back, or is conspicuously missing from it, often tells you whether you actually have a case. If the trustee won’t provide one voluntarily, a petition to compel accounting forces the issue.

What remedies are available for breach of fiduciary duty?

Courts have several tools, and they aren’t mutually exclusive.

Surcharge

A court can order the trustee to personally repay the trust for losses their breach caused. This is a separate, deeper topic. See our page on surcharge actions against a trustee for how damages get calculated and collected.

Removal

A trustee who has breached their duties can often be removed under Probate Code section 15642. We cover the grounds and process on our removing a trustee page.

Instructions or injunctions

A court can order a trustee to take specific action, or stop taking a specific action, without necessarily removing them from the role. This is often the right tool when the problem is a single decision rather than a pattern of misconduct.

Reduced or denied compensation

Courts can deny fees a trustee would otherwise be entitled to when they’ve breached their duties. It’s not a substitute for surcharge when there are real losses, but it matters in cases where the harm is more about conduct than dollars.

Does the business judgment rule protect a trustee’s bad decisions?

Not the way it protects corporate directors. Trustees sometimes argue that a bad investment outcome was just a reasonable business decision that didn’t pan out. California law does give some latitude for good-faith judgment calls, but it’s a narrower shield than corporate directors get. A trustee with a conflict of interest, who failed to investigate before acting, or who ignored the trust’s stated purpose doesn’t get the benefit of that latitude.

How does capacity fit into a breach claim?

Sometimes poor trustee decisions trace back to declining mental capacity rather than bad faith. That’s a related but distinct set of issues, since capacity and undue influence can affect not just a trustee’s conduct but, in some cases, whether the trust itself was validly created or amended in the first place. If capacity looks like it’s part of the story, that needs its own separate evaluation.

The honest caveat

Not every disappointing outcome is a breach. Markets go down. Family members disagree about what’s fair. A trustee doing an imperfect but good-faith job isn’t the same as one who’s self-dealing or ignoring their duties, and courts know the difference. Before filing anything, I want to see the actual accounting and communications, not just the beneficiary’s frustration, because that’s what tells us whether there’s a real claim or a relationship that just needs better documentation and more transparency.

Talk to a real California estate attorney

If you’re a beneficiary who suspects a trustee is putting their own interests ahead of yours, or you’re a trustee facing accusations you think are unfair, the facts matter more than the accusation. I’ll look at what you actually have, tell you honestly whether it holds up, and lay out what a claim would take.

Talk to Eric Ridley is a free 60-minute consultation by phone or Zoom, anywhere in California. Or call (805) 244-5291.

Frequently asked questions

What is a breach of fiduciary duty by a trustee in California?

It’s when a trustee fails to act solely in beneficiaries’ interests, whether through self-dealing, mismanagement, favoritism, commingling funds, or refusing to account. California Probate Code sections 16000 to 16015 and the trust document itself define the duties, and violating them creates legal exposure for the trustee.

What duties does a California trustee owe beneficiaries?

Trustees owe a duty of loyalty, a duty to avoid conflicts of interest, a duty to follow the trust’s terms, a duty to keep beneficiaries reasonably informed, a duty of prudent administration including reasonable diversification, and a duty to enforce and defend claims involving trust property.

Can a trustee be sued for a bad investment decision?

Sometimes. California gives trustees some latitude for good-faith judgment calls, but this protection is narrower than the corporate business judgment rule. A trustee who had a conflict of interest, failed to investigate before acting, or ignored the trust’s purpose usually cannot rely on it.

What is the statute of limitations for trustee breach claims in California?

Generally three years from when the beneficiary discovered, or reasonably should have discovered, the facts of the breach. That window can be shortened significantly once the trustee serves a formal accounting with proper notice, so a suspicious accounting shouldn’t sit unreviewed.

What remedies exist for breach of fiduciary duty by a trustee?

Courts can order a surcharge requiring the trustee to personally repay losses, remove the trustee under Probate Code section 15642, issue instructions or injunctions controlling future conduct, and deny or reduce trustee compensation. More than one remedy can apply in the same case.

This is general information about California law, not legal advice for your situation.

Trustee Breach of Fiduciary Duty in California