Will Contest and Estate Planning Competency:
the Role of a Forensic Psychiatrist

By Pia Quimson-Guevarra, DO

Testamentary capacity describes the competency of the testator to comprehend a Will they are signing with understanding and meaning. Laws vary among states about the criteria. Criteria for competency to enter into a contract or revocable trust may also vary among states.

Scope of this Article:

      • Testamentary Capacity and the role of the Forensic Psychiatrist is discussed in this article. Competency overall is a broader question and depends on the context.
      • Competency. Mental Competency is evaluated in a range of settings from entering into a contract to competency to stand trial. Laws in each of these settings and jurisdictions are not consistent to guide the evaluator.
      • Age is not always a factor, but diseases of the elderly are a consideration.
      • Concerns of Elder Abuse.  Often (but not always) testamentary capacity is evaluated in elderly testators. Concerns about Dementia, Alzheimer’s, undue influence and potential for elder abuse are serious. As a physician and Forensic Psychiatrist, Dr. Quimson-Guevarra tackles the subject.

Will Contest

During a Will contest, a forensic psychiatrist can provide valuable expertise by assessing testamentary capacity, or the testator’s ability to make his/her Will. If the testator lacked testamentary capacity, the Will could be invalidated.

 A Will is separate from other vehicles that individuals may use to distribute their estate on death, such as a Revocable Trust.


Is capacity to sign a Will the same as signing a Trust? 

Estate plans vary in the vehicles used to transfer property on death. Revocable Trusts and other instruments might have been signed in addition to a Will. The law and legal precedence vary depending on the act of the person.

Evaluating testamentary capacity to sign a Will may not be the same as competency to enter into a contract, which is how capacity to sign a Trust is conceptualized.

Generally speaking, testamentary capacity, or being of “sound mind,” requires the testator:

  • Know the natural objects of his or her bounty;
  • Know the nature and extent of his or her property;
  • Understand that he or she is signing his or her will; and,
  • Know what the will accomplishes.

States and case law define the criteria and scope for testamentary capacity differently.

Is a Forensic Psychiatrist qualified to evaluate competency to sign a Trust? Is it the same as a Will?

I am qualified, as a forensic psychiatrist, to evaluate mental state, diagnose (or rule out) psychiatric illnesses, and consider medical or mental vulnerability to undue influence or other factors that could impact testamentary capacity.

A Trust is a contract, and competency to enter into a contract is not the same as a Will in many states.

Oregon law considers Testamentary Capacity to include either a Will or a Revocable Trust. 

How do you assess capacity?

If the testator is alive

> Interview the testator. This usually occurs before the Will is signed. An interview is a primary factor in assessing capacity. It is not the exclusive element in assessing capacity.
> Speaking to medical providers and reviewing records are a valuable adjunct to my personal interview of the testator in assessing capacity.

If the testator is deceased

A Will Contest generally follows the testator’s death. This is when those who believe they are beneficiaries, take issue with the terms of the Will. I do not have the benefit of a first-hand interview with the testator and may rely primarily on other records and sources of information I deem appropriate.

Medical considerations whether the testator is alive or deceased.

A Forensic Psychiatrist is a medical doctor. I am qualified, therefore, to apply focused qualified consideration of medical material.

Diagnosis is not made in a vacuum. The diagnoses of treating physicians may reveal more about whether or not the testator was impaired mentally.

Diagnosis(es) rendered prior to the time of signing a Will, during the signing of the Will, or after, are relevant. In addition, if an autopsy was performed, posthumous diagnoses could include the presence of a degenerative brain disease or other physical condition impacting impairment.

All medical conditions are considered, not only psychiatric.

Considered medical information might include

    • treating provider and nurse notes and reports
    • hospital records
    • EMT reports
    • chart notes of healthcare staff and visiting doctors at an assisted living or care facility
    • neuropsychological testing
    • Mental Status Exam (MSE) or Mini-Mental Status Exam (MMSE) administered to the testator. These are sometimes administered by unqualified individuals, such as an attorney. They are also administered by qualified non-medical personnel such as a neuropsychologist.

Regardless of Age

The person signing a Will could be any age.

We tend to think of the elderly person, perhaps impaired by Dementia or Alzheimer’s Disease, as the usual focus of a testamentary capacity legal controversy. 

That is not always the case. For example, Early Onset Dementia may appear in a person under the age of 65.

Symptoms of other medical conditions may also co-exist with other factors that impair judgment—temporarily or over an extended period.

Mental Illness, Addiction, and other Factors

I am sometimes asked if a mental illness or an addiction can be a factor.  It is important to note that having a mental illness or substance use disorder does not by itself mean a testator lacks testamentary capacity.

Addiction. An Addict may not be “using” at the time they sign a Will. An addict in recovery for many years, absent any other medical condition, might have testamentary capacity. However, an addict actively experiencing withdrawal, could have symptoms such as delusions or paranoia. Signing a Will during withdrawal suggests a psychiatrist’s close review of the matter.

As a physician, I assess symptoms, diagnoses, and treatment for any potentially impairing condition.

Cognitive Deficits

An example of symptoms to evaluate are cognitive deficits, which include difficulties in memory, decision-making, problem solving, and attention. If deficits in these functions were present at the time of making a Will, this can impact the testator’s capacity. It is important to mention that a decline in cognitive functions can occur in those with Dementia.


Collateral Information

In addition to medical records, if legal action is taken, I might review depositions and records of those who have observed the degree of the testator’s lucidity, e.g. a financial advisor.

I may conduct interviews of “collateral informants.” This is anyone besides the testator, who has information that might be of interest to me. For example, a health care provider who visited the testator on the day the Will was signed, staff at a care facility, witnesses to the signing of the will, family members, or friends. I do not take all information at face value.

A Forensic Psychiatrist is trained in techniques used to detect malingering—intentional lying for secondary gain, especially important when the collateral interview is with a person impacted by the Will.

The goal would be to interview anyone who can speak to the testator’s mental clarity or state of mind. If the testator is no longer living, collateral interviews may produce valuable information.

Whenever relying on the “word” of another person–especially someone with a vested interest, Malingering is a consideration.

Malingering means “lying for secondary gain.” Secondary gain could be tangible, like money. More rarely it is intangible, like pursuing praise, such as a caregiver or adult child of the testator.

A clinical psychiatrist or non-psychiatrist physician is not qualified to assess Malingering. Forensic Psychiatrists are qualified to assess Malingering.

Undue Influence

Another factor a forensic psychiatrist assesses for is undue influence.

This can happen if an individual manipulates or deceives a testator such that the testator’s ability to freely decide how his/her property is distributed is impacted.

Forensic psychiatrists have an important role in will contests by evaluating if there were any factors impeding a testator’s ability to make his/her will.

If undue influence is alleged, and the plaintiff/defense and/or “influencer(s)” are family members, family dynamics could play a part. As a psychiatrist with a clinical practice, I treat patients who struggle with their family relationships. I find this experience helpful where a family is suing one another. Allegations of undue influence between family members may very well be such a situation.


As long as the testator’s symptoms do not impact his/her ability to understand the extent of his/her property, natural objects of their bounty, manner of distribution or other feature in making a will, he/she would have testamentary capacity.

It is the job of the forensic psychiatrist to evaluate if the testator did, or did not, have symptoms or behaviors that impacted his/her ability when making a will.

[1] “To have mental capacity, the testator must have the ability to know: (1) the nature/extent of property; (2) the natural objects of her property; (3) the disposition that her will is making; and (4) the ability to connect all of these elements together to form a coherent plan.”  https://www.law.cornell.edu/wex/testamentary_capacity (1) the nature/extent of property; (2) the natural objects of her property; (3) the disposition that her will is making; and (4) the ability to connect all of these elements together to form a coherent plan.”  Cornell Law Institute, https://www.law.cornell.edu/wex/testamentary_capacity

Dr. Quimson-Guevarra

Creating a Will with understanding and lucidity is legally significant. Contests can and do occur over the competency of the person who made the Will or Trust.

Dr. Quimson-Guevarra is a Board-Certified Psychiatrist and Forensic Psychiatrist practicing medicine in Oregon.

She renders medical opinions in legal matters, including testamentary capacity and competency evaluations, and treats patients in private practice.

Dr. Quimson-Guevarra wrote this article to help readers understand the psychiatric evaluation before or after death of the testator.

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