Co-Trustee Deadlock: What to Do When Co-Trustees Disagree
With exactly two co-trustees and a trust document that’s silent on how disputes get resolved, California law generally requires unanimous agreement, and a 1-1 split freezes the trust until someone breaks it. Naming co-trustees is supposed to add a layer of protection: two sets of eyes, shared accountability, a check on any one person acting badly. In practice, it sometimes just means two people who don’t trust each other, both with legal authority over the same trust, and no way forward when they disagree.
What California law actually says about co-trustee decisions
Probate Code § 15620 sets the default rule: if a trust has three or more co-trustees, a majority can act. Unless the trust document says otherwise, unanimous agreement isn’t required when there are at least three trustees, and the majority’s decision binds the trust.
But most co-trustee arrangements aren’t three-person committees. They’re two people, often siblings, sometimes a family member paired with a professional or institutional trustee. With exactly two co-trustees, § 15620’s majority rule doesn’t help, because a 1-1 split isn’t a majority of anything. Unless the trust document specifically authorizes one co-trustee to act alone or sets a different decision rule, two co-trustees generally need to act unanimously. That’s where deadlock happens.
Check the trust document first
Before assuming you’re stuck, read what the trust actually says about co-trustee authority. Some drafters anticipate this problem and build in solutions.
Independent action provisions
Some trusts allow either co-trustee to act alone for certain transactions, particularly routine ones, while requiring joint action for major decisions like selling real property or making discretionary distributions.
Tie-breaking mechanisms
Some trusts name a third party, sometimes a professional fiduciary, whose role is limited to breaking deadlocks when the co-trustees can’t agree.
Delegation clauses
Trust terms sometimes allow one co-trustee to delegate authority to the other for specific matters, subject to the duty to monitor under Probate Code § 16403.
If the document is silent, and most are, California law fills the gap with the default unanimity rule for two-trustee arrangements, and deadlock becomes a real operational problem rather than a theoretical one.
What deadlock actually looks like
This isn’t usually about co-trustees disagreeing on something trivial. It’s typically one of a few recurring fact patterns: one co-trustee wants to sell trust real property, the other wants to hold it, and neither will budge. One co-trustee wants to make a distribution to a beneficiary, the other believes it’s premature or unfair to other beneficiaries. One co-trustee suspects the other of self-dealing or mismanagement and refuses to sign off on further transactions until it’s addressed. Or the co-trustees simply don’t communicate, and the trust’s administration stalls by default rather than by an actual disagreement on the merits. In every version, the trust sits frozen while bills go unpaid, investments go unmanaged, or a beneficiary who needs a distribution waits.
What to do about it, in order
Try direct resolution, but set a deadline
Not every deadlock needs a courtroom. Sometimes a structured conversation, sometimes with each co-trustee’s own attorney present, resolves the disagreement without further escalation. But don’t let “let’s talk it through” become an open-ended excuse for inaction. If a specific decision needs to be made and 30 to 60 days pass without resolution, it’s time to escalate.
Mediation
Trust mediation, often through a retired probate judge or an experienced trust mediator, gives co-trustees a structured, private way to resolve a specific dispute without the cost and permanence of litigation. This works particularly well when the co-trustees are also family members who have to maintain some relationship after the trust is administered.
Petition the court under Probate Code § 17200
When direct resolution and mediation don’t work, a co-trustee, or a beneficiary affected by the deadlock, can petition the probate court under Probate Code § 17200 for instructions. This is the standard mechanism for asking a court to resolve a specific administration question: whether to sell an asset, whether a distribution is appropriate, or how a disputed trust provision should be interpreted. The court’s order then gives both co-trustees clear authority to act, resolving the deadlock without requiring either side to back down.
Petition to remove a co-trustee
If the deadlock stems from one co-trustee’s misconduct rather than a good-faith disagreement, such as self-dealing, failure to account, or a fundamental inability to cooperate that’s harming the trust, Probate Code § 15642 allows a petition to remove that trustee. Courts don’t remove trustees lightly, but persistent deadlock that damages trust assets or delays required distributions is exactly the kind of harm that supports removal.
Petition to modify the trustee structure
In some cases, the right fix isn’t removing anyone, it’s changing the structure. A court petition can ask to convert a two-trustee structure to a single trustee, add a neutral third trustee to break future ties, or otherwise modify how decisions get made going forward.
Options at a glance
| Option | Best for |
|---|---|
| Direct resolution | Good-faith disagreement, relationship worth preserving |
| Mediation | Family co-trustees who need a structured but private process |
| § 17200 petition for instructions | A specific stuck decision with no misconduct involved |
| § 15642 removal petition | Deadlock rooted in one trustee’s misconduct |
| Petition to restructure | Recurring deadlock that a structural fix would prevent |
Why this shouldn’t sit unresolved
Every month a deadlock continues, the trust potentially loses value: unpaid property taxes, uninvested cash sitting idle, a sale that doesn’t close while the market moves, a beneficiary who needed a distribution for a real expense and didn’t get it. Co-trustees who let personal friction stall trust administration can find themselves facing a breach of fiduciary duty claim for the delay itself, separate from whatever the underlying disagreement was about.
Preventing deadlock before it starts
If you’re the one drafting or reviewing a trust that will name co-trustees, this is the moment to fix the problem the statute doesn’t solve for two-person arrangements. Explicitly authorizing one co-trustee to act alone for routine matters, naming a tie-breaking third party, or simply choosing a single trustee with an independent successor avoids the entire deadlock scenario. Families often default to naming two children as co-trustees to seem fair, without realizing that fairness on paper can become paralysis in practice. A trust that names one trustee, with a clear line of successors, frequently administers faster and with less conflict than one that splits authority between siblings who don’t agree on much.
What a beneficiary can do while co-trustees are deadlocked
A beneficiary isn’t required to sit and wait while co-trustees fight. If a distribution is genuinely overdue, or trust property is losing value because of inaction, a beneficiary can send a written demand to both co-trustees documenting the harm and requesting action within a set period. If that doesn’t move things, the same § 17200 petition for instructions that a co-trustee can file is also available to an affected beneficiary, and courts take a beneficiary’s petition just as seriously when the underlying harm is real and documented.
The honest caveat
Not every co-trustee disagreement needs a petition. Courts expect co-trustees to try to work it out first, and a § 17200 petition filed over a disagreement that was never seriously discussed can look premature. The deadline you set for direct resolution matters, both practically and for how the court views the case if it gets there.
Talk to a real California estate attorney
Co-trustee deadlock is a narrow problem with well-established solutions in California trust law, but it needs someone who can move it forward rather than let it sit. I represent co-trustees and beneficiaries in these disputes, from the initial demand letter through a § 17200 petition when court intervention becomes necessary.
Talk to Eric Ridley is a free 60-minute consultation by phone or Zoom, anywhere in California. Or call (805) 244-5291.
Related reading: How to choose a trustee · Can a trustee also be a beneficiary · The complete guide to trust administration in California
Frequently asked questions
Do co-trustees need to agree unanimously in California?
With three or more co-trustees, a majority can act under Probate Code § 15620. With exactly two, unless the trust says otherwise, unanimous agreement is generally required.
What can a co-trustee do when the other won’t agree?
Check the trust for independent action or tie-breaking provisions, try direct resolution with a deadline, then mediation, then a § 17200 petition for instructions if needed.
Can a deadlocked co-trustee be removed?
Yes, if the deadlock stems from misconduct or a fundamental inability to cooperate that harms the trust, under Probate Code § 15642.
How long can a co-trustee deadlock go on before it becomes a legal problem?
No fixed deadline, but every month risks real harm, and co-trustees who let it sit can face a breach of fiduciary duty claim for the delay itself.
This is general information about California law, not legal advice for your situation.
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