Lack of Capacity to Create a Trust: What It Means Under California Law

Lack of capacity means the person who signed a trust or amendment could not, at that moment, understand and appreciate what the document did: its effect on their property, the people it affected and its likely consequences. California presumes everyone has capacity, so a challenger must show specific mental impairments, not just a diagnosis.

Most people facing this question are watching a parent or relative's estate plan change in ways that make no sense to them. Often it is a late-life amendment signed during a period of memory loss, confusion or heavy medication. Some have just received a trustee's notice after a death and are trying to work out whether what they saw in those final months matters legally. Others are the trustee or the new beneficiary, now accused of benefiting from a document the settlor could not understand. Every one of them is trying to separate "Mom was declining" from "Mom lacked capacity," and California law treats those as two different things.

This article explains the California capacity framework, the evidence that tends to matter, how capacity relates to undue influence, how a contest moves through the Superior Court of California, and what a court may order. Throughout, "settlor" means the person who creates the trust.

What Lack of Capacity Means for a California Trust

The starting point is a presumption in the settlor's favor. Probate Code section 810 declares "a rebuttable presumption affecting the burden of proof that all persons have the capacity to make decisions and to be responsible for their acts or decisions." A presumption is a starting assumption the law makes. A rebuttable presumption is one that can be overcome with evidence. It also puts the burden on the person claiming incapacity. Section 810 adds that a person with a mental or physical disorder "may still be capable of... executing wills or trusts." A court's finding of incapacity should rest on "evidence of a deficit in one or more of the person's mental functions rather than on a diagnosis."

Probate Code section 811 names the mental functions that count. A finding that someone lacked capacity to execute a trust must be supported by evidence of a deficit in at least one of these areas:

• Alertness and attention. This includes level of consciousness, orientation to time, place, person and situation, and the ability to concentrate.
• Information processing. This includes short- and long-term memory, understanding and communicating with others, recognizing familiar people and objects, understanding quantities, abstract and logical reasoning, and planning in one's own rational self-interest.
• Thought processes. Severely disorganized thinking, hallucinations, delusions, or uncontrollable intrusive thoughts may show a deficit here.
• Ability to modulate mood and affect. A persistent emotional state that is out of proportion to the person's circumstances may show a deficit here.

Section 811 also requires evidence connecting the deficit to the decision or act in question. A deficit may be considered only if, alone or together with other deficits, it significantly impairs the person's ability to understand what is at stake. Memory lapses about appointments do not prove that someone could not understand a trust amendment.

Probate Code section 812 describes what the person must be able to do, except where other law provides otherwise. The person must be able to communicate the decision and to understand and appreciate, to the extent relevant:

"(a) The rights, duties, and responsibilities created by, or affected by the decision. (b) The probable consequences for the decisionmaker and, where appropriate, the persons affected by the decision. (c) The significant risks, benefits, and reasonable alternatives involved in the decision."

The focus is the signing itself. The question is what the settlor could understand when they signed the particular document. A dementia or Alzheimer's diagnosis is evidence that may matter. Under sections 810 and 811, however, the diagnosis is not the test. The functional impairment must be shown.

The Standard Specifically Applied to Trusts

Section 812 is the general rule for decision-making capacity, and it carves out exceptions. One is Probate Code section 813. That section addresses a different decision entirely: capacity to give informed consent to proposed medical treatment. It is not a separate test for signing a trust. It appears in many capacity disputes because medical decisions made during the same period are sometimes part of the record. The second exception is "the statutory and decisional law of testamentary capacity." Testamentary capacity is the capacity to make a will.

For wills, Probate Code section 6100.5 is more specific. A person is not mentally competent to make a will if, at the time of making it, either of two conditions is true. The first is that the person cannot understand the nature of the testamentary act, cannot understand and recollect the nature and situation of their property, or cannot remember and understand their relations to living descendants, spouse, parents and others whose interests the will affects. The second is that the person suffers from a mental health disorder with delusions or hallucinations that led them to leave property in a way they otherwise would not have.

For trust disputes, the practical point is this. Sections 810 through 812 set a functional framework tied to the specific decision. The more involved the trust or amendment, the more there is for the settlor to understand. Which standard a court applies to a particular trust instrument can depend on how simple or complex that instrument is. That question belongs to an attorney reviewing the actual document.

Capacity is measured at a moment, and people's conditions vary. A settlor who was confused in March may have been clear on the April afternoon they signed, or the reverse. That is why evidence from the days around execution usually carries more weight than evidence from months away. Under section 810, the person challenging the trust carries the burden of proving the presumption of capacity does not hold.

Evidence Courts Consider in a Capacity Challenge

Capacity cases are built from records and witnesses close to the signing date. For a family member who saw the decline firsthand, it can be frustrating to learn that their own memories are only one piece of the picture. The kinds of evidence that commonly appear include:

• Medical records. These include physician notes, hospital charts, medication lists, cognitive screening results and any neuropsychological evaluation from around the time of execution.
• Lay witnesses. Family members, caregivers, neighbors and friends can describe how the settlor behaved, communicated, recognized people and handled money.
• The drafting attorney's file. This may include notes of meetings, who attended, who asked for the change, and any capacity assessment done at signing.
• Notary and witness observations. These are the people present at execution and what they saw and heard.
• The document itself. Courts look at whether it is internally consistent, whether it matches what the settlor said they wanted over the years, and how sharply it departs from earlier estate plans.
• Expert witnesses. Geriatric psychiatrists, neurologists or neuropsychologists may review the records and give an opinion on functional capacity at the relevant time, often without ever having met the settlor.

These experts translate medical records into the vocabulary of section 811: which functions were impaired, how severely, and whether the impairment connected to the decision to sign.

Lack of Capacity and Undue Influence: How They Differ and Overlap

Lack of capacity and undue influence are separate legal theories. A trust can be challenged on either one, or on both. A capacity claim asks whether the settlor could understand the decision. An undue influence claim focuses on whether someone else's pressure produced it. For the meaning of undue influence, Probate Code section 86 adopts a statutory definition found in the Welfare and Institutions Code. It also preserves the common-law meaning alongside that definition.

The two theories often travel together. A settlor with diminished memory or reasoning may be more easily steered by someone close to them. For that reason, when cognitive decline is alleged, both theories are frequently pleaded and considered together.

Probate Code section 21380 can shift the burden in certain situations. A provision making a donative transfer, meaning a gift, to certain people is presumed to be the product of fraud or undue influence. Those people include:

• the person who drafted the instrument;
• a person in a fiduciary relationship with the transferor who transcribed the instrument or caused it to be transcribed;
• a care custodian of a dependent adult, if the instrument was signed while the care custodian provided services or within 90 days before or after that period; and
• certain relatives, cohabitants, employees and law-firm associates of those people.

This presumption affects the burden of proof. It may generally be rebutted by clear and convincing evidence that the transfer was not the product of fraud or undue influence. For a transfer to the drafter, or to the relatives, cohabitants, employees and law-firm associates of the drafter described in section 21380(c), the presumption is conclusive. A beneficiary who fails to rebut the presumption bears all costs of the proceeding, including reasonable attorney's fees.

The presumption is narrow. It does not make every gift to a caregiver, relative or helper presumptively invalid. Its terms have to fit the facts.

How a Capacity-Based Trust Contest Works in California

A capacity challenge is filed as a petition in the Superior Court of California for the county where the trust is administered. Probate Code section 17200(a) generally allows a trustee or beneficiary to petition the court "concerning the internal affairs of the trust or to determine the existence of the trust." The way that petition is structured is covered in more depth on this site's page about a Probate Code 17200 petition. The steps of a contest are covered in the guide on how to contest a trust. General information about California's courts is available from the Judicial Branch of California.

The deadline usually begins with a notice. Under Probate Code section 16061.7(a), a trustee must serve a notification in several events, including these two:

• when a revocable trust becomes irrevocable because of a settlor's death; and
• whenever the trustee of an irrevocable trust changes.

The notification goes to beneficiaries and, after a settlor's death, to the settlor's heirs.

Probate Code section 16061.8 then sets the deadline for a person served with the notification under section 16061.7(a)(1). That person cannot bring an action to contest the trust more than 120 days from the date the notification is served on them. Alternatively, if a copy of the trust terms is delivered to them during that 120-day period, the deadline is 60 days from that delivery. Whichever date is later controls. The clock runs from service of the notice or delivery of the terms, not from the death.

Many trusts include a no contest clause, which threatens to cut out a beneficiary who challenges the trust. Under Probate Code section 21311(a), such a clause may be enforced only against the following:

• a direct contest brought without probable cause;
• a pleading claiming that property transferred was not the transferor's property, but only if the clause expressly says so; and
• a creditor's claim or an action based on one, but only if the clause expressly says so.

Section 21311(b) explains that probable cause exists if, at the time of filing, "the facts known to the contestant would cause a reasonable person to believe that there is a reasonable likelihood that the requested relief will be granted after an opportunity for further investigation or discovery." A no contest clause does not automatically disinherit everyone who challenges a trust.

What Happens If a Court Finds the Settlor Lacked Capacity

A finding of incapacity does not end the case. The court still has to decide what follows from it. Section 17200(b) lists proceedings the court may hear, and the list is not exhaustive. They include:

• determining the validity of a trust provision;
• ascertaining beneficiaries and determining to whom property passes;
• settling accounts and passing on the trustee's acts;
• appointing or removing a trustee; and
• compelling redress of a breach of trust.

A capacity ruling may be the first step in deciding which version of the trust governs and who receives what. Where only a late amendment is attacked, the dispute centers on that amendment. The rest of the trust is not necessarily affected.

Probate Code section 17206 gives the court discretion to "make any orders and take any other action necessary or proper to dispose of the matters presented by the petition." That expressly includes appointing a temporary trustee.

The trustee may have distributed, sold or used property under a document later found invalid. In that situation, Probate Code section 16420(a) lets a beneficiary or cotrustee seek appropriate remedies for a breach or threatened breach of trust. These are:

• compelling the trustee to perform;
• enjoining a breach;
• compelling redress by payment of money or otherwise;
• appointing a receiver or temporary trustee;
• removing the trustee;
• setting aside the trustee's acts, subject to section 18100;
• reducing or denying the trustee's compensation;
• imposing an equitable lien or constructive trust, subject to section 18100; and
• tracing and recovering wrongfully disposed property, subject to section 18100.

Section 16420(b) adds that other statutory and common-law remedies remain available. None of these results is automatic. Each depends on the evidence and on the court's judgment. The broader set of remedies is discussed on the page about California trust litigation.

If You'd Like to Talk Through a Capacity Dispute

Capacity disputes turn on timing and on records that families rarely have in one place. An attorney would look at several things together:

• the signing date of the trust or amendment;
• the settlor's medical records from that period;
• how the new document differs from earlier versions;
• who was involved in arranging the signing; and
• when any trustee's notification or copy of the trust terms arrived.

This page is written for people already facing a disagreement over an existing trust. Anyone still deciding whether a disagreement exists at all may find a conversation with the trustee about the documents a useful starting point. To discuss a disputed trust or amendment with an attorney, you can contact California Trust Litigation Lawyers to request a consultation about your dispute.