Who can override a power of attorney in California?
It is a question that usually arrives in a difficult moment — a family worried that an aging parent's agent is making the wrong calls, or someone simply wanting to know who is really in charge. The honest answer is narrower than most people assume: while the principal still has capacity, only the principal can override their own power of attorney. After that, the power passes not to the family but to a court. Here is exactly who can do what, who cannot, and the right path when something looks wrong.
The principal, first and foremost.
As long as the principal — the person who signed the power of attorney — still has the mental capacity to make their own decisions, they hold all the cards. California law lets a capable principal revoke or change a power of attorney at any time and for any reason, or no reason at all. They do not need anyone's permission, and the agent does not get a vote.
This is the part that reassures people: if you signed a power of attorney and have second thoughts about your agent, and you are still of sound mind, undoing it is squarely your right. The power of attorney never transferred ownership of your decisions — it only lent authority, and you can take that authority back.
How a capable principal actually revokes it.
Revocation by a capable principal can be done in more than one way. The document itself may set out a method; following it works. Beyond that, California law says the principal can revoke simply by informing the agent, orally or in writing, that the authority is ended — and notably, the power of attorney cannot strip away that right, however it is drafted.
That said, the clean way to do it is a signed, notarized written revocation, with copies delivered to the agent and, crucially, to every bank, financial institution, and health-care provider that had been relying on the old document. The reason is practical: a third party that has not been notified of the revocation is legally protected if it keeps honoring the old authority. Revocation is only as effective as the notice behind it — telling the world is part of the job, not an afterthought.
Who cannot override it: the family misconception.
Here is the rule that catches families off guard. A spouse cannot override their husband's or wife's power of attorney just by being the spouse. An adult child cannot revoke a parent's power of attorney because they disagree with the agent. Being closely related, however much you care, simply does not carry the legal power to set aside a valid document someone else signed.
What a concerned spouse or relative can do — and it is an important "can" — is go to court. If they believe the agent is misusing the authority and the principal can no longer protect themselves, they may petition the probate court to look into it, suspend the agent, or revoke the authority. The power to override, once the principal cannot act, runs through a judge, not through the family tree.
When the principal has lost capacity — and an agent is abusing it.
This is the hardest version of the question, and the one the courts exist to answer. When the principal can no longer revoke the document themselves, and there is genuine reason to believe the agent is self-dealing or otherwise abusing the authority — unauthorized transactions, property sold for no benefit to the principal, money moved for the agent's own gain — the answer is not self-help. No one should try to seize accounts or "cancel" the document on their own.
The path is a petition to the probate court. A range of people are entitled to bring one — the principal, a spouse, a relative, an existing conservator, a public guardian, a court investigator, among others. The court can suspend or remove the agent and, where the principal needs ongoing protection, establish a conservatorship. Suspected financial abuse of an elder or dependent adult should also be reported to Adult Protective Services. Because the stakes are high and the procedure is exacting, this is a situation to handle with a lawyer — the agent is a fiduciary, and misuse is both elder financial abuse and a breach of duty the court takes seriously.
When a conservatorship takes over.
A power of attorney is a private arrangement between two people. A conservatorship is the court itself stepping in. When a judge appoints a conservator over a person or their estate, that court-supervised authority controls, and the agent under the power of attorney stops acting. The conservator, overseen by the court and accountable to it, takes over the decisions.
That hierarchy is exactly why a conservatorship is treated as a more restrictive, later-resort measure — and why so many people sign a durable power of attorney in the first place. A trusted agent chosen in advance is meant to make a court conservatorship unnecessary. When it works, the family never has to ask a judge to step in at all.
When it ends on its own.
Some events override a power of attorney automatically, without anyone needing to act:
Death. A power of attorney ends the instant the principal dies; the agent's authority stops, and responsibility passes to the executor named in the will or the successor trustee of the trust. Divorce. If the principal and the agent were married and the marriage is dissolved or annulled, the former spouse's appointment as agent is automatically revoked. Incapacity, for a non-durable POA. A power of attorney that was never made "durable" ends the moment the principal becomes incapacitated — which is the whole reason durability exists. A durable power of attorney keeps working through incapacity; a non-durable one quietly switches off exactly when it would be needed.
Where a professional fiduciary fits in.
Much of the trouble behind this question comes down to who was named as agent. When the agent is a relative with their own interests, or when family conflict makes any single relative the wrong choice, the authority can be misused — and untangling that after the fact is painful and costly. Choosing well at the start avoids most of it.
A licensed professional fiduciary can serve as the agent under a power of attorney when there is no suitable family member, or when a neutral party is simply the wiser choice. The professional is bound by the same fiduciary duties as any agent, with independent record-keeping and no personal stake in the principal's finances — which is precisely the structure that keeps the question "who can override this?" from ever having to be asked in anger. Drafting the document remains the attorney's role; serving in it, faithfully, is where a professional fiduciary comes in.
Where to go next.
Depending on what you are working through, here is where to read further:
To understand the agent role this practice can serve in — as agent under a power of attorney, and the related successor roles — see agent and successor-trustee services in California.
For what a power of attorney is to begin with — financial versus health-care, durable versus springing — see what is a power of attorney in California.
If you are weighing a power of attorney against a conservatorship — planning ahead versus going to court after capacity is lost — see power of attorney vs. conservatorship in California.
Overriding or contesting a power of attorney in a dispute is legal work for an attorney. If your concern is choosing a trustworthy agent in the first place, or appointing a neutral professional to serve in that role, that is a conversation worth having.
Common questions.
Who can override a power of attorney in California?
The short answer is narrower than most people expect. While the principal — the person who granted the power — still has mental capacity, they alone can revoke or change it, at any time and for any reason. If the principal has lost capacity, no relative can simply override the document on their own; instead, a concerned person must petition the probate court, which can suspend or end the agent's authority and, where needed, appoint a conservator. And once a court appoints a conservator, the conservator's authority takes precedence over the agent's. So the real answer is: the principal, a court, or a court-appointed conservator — not a spouse or child acting alone.
Can a spouse or family member override a power of attorney?
Not by themselves. Being a spouse, an adult child, or a sibling does not give anyone the power to revoke or set aside a valid power of attorney that someone else signed. This surprises families, but it is the rule. What a spouse or relative can do, if they believe the agent is misusing the authority and the principal can no longer protect themselves, is petition the probate court to investigate, suspend, or revoke the agent's authority. The power runs through the court, not through the family relationship.
How does the principal revoke a power of attorney?
If the principal has capacity, California law makes it straightforward: they can revoke by following any method the document itself sets out, or simply by telling the agent — orally or in writing — that the authority is revoked, a route the document cannot take away. In practice it is done properly with a signed, notarized revocation, with copies delivered to the agent and to every bank, financial institution, and health-care provider that had been relying on the old document. Notice is what makes it real: an institution that has not been told of the revocation is protected if it keeps honoring the old authority.
What if the principal has lost capacity and the agent is abusing the power?
This is the situation the court exists for. When the principal can no longer revoke the document themselves and there is reason to believe the agent is self-dealing or otherwise misusing the authority — unauthorized transactions, property sold without benefit to the principal, money moved for the agent's gain — the path is a petition to the probate court, not self-help. The court can suspend or remove the agent and may establish a conservatorship to protect the person and their finances. Suspected financial abuse of an elder should also be reported to Adult Protective Services. Acting through a lawyer here matters, because the stakes and the rules are both serious.
Does a conservatorship override a power of attorney?
Yes. A power of attorney is a private arrangement; a conservatorship is the court stepping in. Once a judge appoints a conservator over a person or their estate, that court-supervised authority controls, and the agent under the power of attorney no longer acts. This is one reason a conservatorship is considered a more restrictive, last-resort measure — and why many people sign a durable power of attorney in the first place, precisely to arrange trusted help in advance and reduce the chance a court conservatorship ever becomes necessary.
Does a power of attorney end on its own in some situations?
Yes, certain events end it automatically. A power of attorney ends when the principal dies — at that point the agent's authority stops entirely and matters pass to the executor or successor trustee. A divorce or annulment automatically revokes a former spouse who had been named as agent. And a power of attorney that was not made "durable" ends the moment the principal becomes incapacitated, which is exactly why durability matters: a durable power of attorney keeps working through incapacity, while a non-durable one does not.
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