What Is a Plenary Guardian in Michigan?

A plenary guardian in Michigan is a person appointed by the probate court to make personal and daily-life decisions for an adult the court has found completely unable to care for themselves. Michigan law uses two overlapping frameworks for this role. The Estates and Protected Individuals Code (EPIC) calls the appointee a “full guardian” for an incapacitated adult, while the Mental Health Code uses “plenary guardian” for people with developmental disabilities. The powers and duties largely mirror each other, and in everyday use the term plenary describes any guardianship that grants comprehensive authority over the ward’s person.¹

When a Michigan Court Will Appoint a Full Guardian

A probate judge can appoint a full guardian only after finding, by clear and convincing evidence, that the individual is totally without capacity to care for themselves.¹ That is a high bar, and it is not discretionary. If the person can handle some decisions on their own but struggles with others, the court must appoint a limited guardian whose powers are confined to the specific areas spelled out in the order. The court cannot grant plenary authority in that situation.

The clear and convincing standard usually rests on medical evaluations and testimony from treating professionals, combined with concrete, documented examples of conduct showing why a guardian is needed. Vague worry about declining health or poor choices is not enough. The petition itself must lay out specific facts.²

Before accepting a petition the court also has to give the petitioner written information about less restrictive options: limited guardianship, conservatorship, patient advocate designations, and durable powers of attorney. Michigan’s statutory preference is for the least restrictive arrangement that meets the person’s actual needs.²

What a Plenary Guardian Can Decide

A full guardian’s authority covers the ward’s personal care, not their money. Within that sphere, the guardian is responsible for the day-to-day shape of the ward’s life. The guardian must also consult the ward on major decisions whenever meaningful communication is possible; the ward’s voice does not disappear once a guardian is in place.³

Residence. The guardian decides where the ward lives, including placements outside Michigan when appropriate. Any change in the ward’s or the guardian’s residence must be reported to the court within 14 days.
Care and daily support. The guardian arranges the ward’s care, comfort, training, and education, and is specifically required to work toward restoring the ward to self-management at the earliest possible time.
Medical treatment. The guardian consents to medical care, mental health treatment, and professional services.
End-of-life directives. The guardian may execute or revoke a do-not-resuscitate order, but only after visiting the ward within 14 days of signing and consulting the ward’s attending physician about the specific medical reasons.
Personal belongings. The guardian takes reasonable care of the ward’s clothing, furniture, vehicles, and similar personal property.

Even a plenary guardian only exercises the powers the court’s order actually grants. The statute sets the ceiling; the order sets the particulars.³

What a Plenary Guardian Cannot Do

The word “plenary” misleads people. Full authority over the person is not full authority over everything.

Money and property. A guardian does not manage the ward’s estate, investments, income, or financial obligations. That requires a separate conservatorship under MCL 700.5401.⁴ If the ward owns property that needs protection beyond basic personal belongings, the guardian is expected to initiate a conservatorship proceeding. The same person often ends up serving in both roles, but they are legally distinct appointments with separate court oversight.³

Social Security and SSI. A probate court order does not give the guardian authority over federal benefits. The Social Security Administration does not recognize state guardianship appointments for this purpose. To manage Social Security, SSI, or SSDI payments, the guardian has to apply separately to the SSA to become a representative payee.

Inpatient psychiatric admission. The guardian cannot consent to inpatient mental health hospitalization unless the court expressly grants that power. If the ward objects to mental health treatment, the guardian has to follow the involuntary treatment procedures under Michigan’s Mental Health Code.³

Ongoing Duties and Court Oversight

A plenary guardianship is not a one-time appointment. The guardian has to visit the ward within three months of appointment and at least every three months after that. They have to file a report with the probate court at least once a year and serve it on the ward and other interested persons.⁵

The annual report has to cover:

The ward’s current mental, physical, and social condition
Any improvement or decline over the past year
Current living arrangement and any changes
Whether the guardian recommends a different living arrangement
Medical and mental health treatment received
Whether the guardian executed, reaffirmed, or revoked any DNR order, nonopioid directive, or physician orders for scope of treatment during the year
Services the ward received
A list of the guardian’s visits and activities on the ward’s behalf
A recommendation about whether continued guardianship is still necessary

That last item carries real weight. Each year the guardian has to assess whether plenary authority is still warranted, which fits Michigan’s broader statutory push to restore the ward’s independence wherever possible.

If concerns surface in the annual report or through other channels, the court can send a visitor to the guardian’s home and to wherever the ward lives, observe conditions, and report back before deciding whether to modify or end the guardianship.⁶

Rights the Ward Keeps

A plenary guardianship takes away significant rights, which is why Michigan law builds in a long list of protections the ward retains. MCL 700.5306a sets them out, and the guardian ad litem is required to explain them to the individual before any guardian is appointed.⁷

The ward can petition at any time to modify or end the guardianship, and can do so by writing an informal letter to the court or the judge. Anyone who knowingly interferes with that request is subject to contempt. The court must hold a hearing on the request within 28 days. The ward can also object to a successor guardian and may have legal counsel of their own choosing.⁶

How Someone Becomes a Plenary Guardian

Anyone concerned about the individual’s welfare can file the petition, and the individual can petition on their own behalf. Once filed, the court sets a hearing date and appoints a guardian ad litem (GAL) to represent the allegedly incapacitated person, unless they already have an attorney.⁸

The GAL is usually a lawyer acting as the court’s investigator. They must visit the individual in person, explain what a guardianship means and what rights the person has, learn whether the person wants to contest the petition, and specifically evaluate whether a limited guardian or some other arrangement would meet the need instead of a full one. That independent assessment is one of the strongest safeguards in the process, because the GAL has no stake in the outcome.

At the hearing, the individual has the right to be present, see and hear all evidence, present evidence and cross-examine witnesses, request an independent medical evaluation (at public expense if indigent), and demand a jury trial. The court takes practical steps, including moving the hearing location if necessary, to make sure the person can attend.⁷

The probate court filing fee is $150, and the court can waive it for people who cannot afford it.⁹ Attorney fees, GAL fees, medical evaluation costs, and any contested hearing expenses add up quickly, often into several thousand dollars, and those costs generally come out of the ward’s estate once the guardianship is established. A guardian who is not otherwise paid for their services can also receive reasonable compensation from the estate, subject to court approval.⁴ For a ward with limited assets, the setup costs alone can consume a meaningful share of what is there, which is worth weighing with an attorney before filing.

1
Michigan Legislature. Michigan Compiled Laws 700.5306 – Court Appointment of Guardian of Incapacitated Individual
2
Michigan Legislature. Michigan Compiled Laws 700.5303 – Court Appointment of Guardian, Petition
3
Michigan Legislature. Michigan Compiled Laws 700.5314 – Powers and Duties of Guardian
4
Michigan Judicial Institute. Introduction to Conservatorships and Guardianships
5
Michigan Legislature. Michigan Compiled Laws 700.5314 – Powers and Duties of Guardian
6
Michigan Legislature. Michigan Compiled Laws 700.5310 – Resignation or Removal of Guardian
7
Michigan Legislature. Michigan Compiled Laws 700.5306a – Rights of Individual for Whom Guardian Is Sought or Appointed
8
Michigan Legislature. Michigan Compiled Laws 700.5305 – Guardian Ad Litem, Legal Counsel
9
Michigan Courts. Probate Court Fee Tables