Plenary Guardianship in Illinois: Petition, Hearing, and Reports

Plenary guardianship in Illinois is a probate court order that transfers full legal authority over an adult’s personal and financial decisions to another person, called the guardian. A judge will only sign that order after finding, by clear and convincing evidence, that the adult is completely unable to make responsible decisions about their care, their money, or both.¹ Because the arrangement removes fundamental rights, state law requires courts to use it only to the extent the person’s actual limitations demand and to consider less restrictive options first.

How Plenary Guardianship Differs From Limited Guardianship

Illinois courts can match guardianship to a person’s real abilities. A limited guardian receives authority only over the specific areas where the adult cannot function, such as finances but not medical care. A plenary guardian receives authority over every personal and financial decision because the court has found the person entirely lacks decision-making capacity.² The statute is explicit that guardianship should be ordered “only to the extent necessitated by the individual’s actual mental, physical and adaptive limitations.”¹

Before filing, consider whether a less intrusive tool would work. A power of attorney lets someone appoint a trusted person to handle finances or health care while keeping the right to revoke that authority later. Illinois also enacted the Supported Decision-Making Act in 2022, which lets adults with disabilities make their own choices with help from a support network instead of surrendering control to a guardian. These alternatives only work when the person has enough capacity to participate. When they do not, plenary guardianship may be the only option that provides real protection.

Who Can Serve as a Plenary Guardian

To qualify, a proposed guardian must be at least 18 years old, a U.S. resident, of sound mind, and not currently under a guardianship themselves. The court must also find the person capable of providing a suitable guardianship program for the specific ward involved.³

A felony conviction is not an automatic bar. The court weighs the nature of the offense, when it happened, and evidence of rehabilitation. One category is disqualifying without exception: anyone convicted of a felony involving harm or threat to a minor, an elderly person, or a person with a disability, including felony sexual offenses, can never be appointed.³

When no qualified individual is available or willing, the court may appoint a public agency or a not-for-profit corporation as guardian of the person. Any corporation authorized to manage trusts in Illinois may serve as guardian of the estate.³

Filing the Petition

The case starts with a petition in the probate court of the county where the adult lives. County forms vary, so a call to the local circuit clerk before filing saves time. The petition must include:

The respondent’s full name, date of birth, and current address.
The names and addresses of the respondent’s spouse, adult children, parents, and adult siblings; if none exist, the closest known adult relatives.
A clear explanation of why guardianship is necessary and why plenary authority is needed rather than a limited arrangement.
The approximate value of the respondent’s real and personal property and their anticipated annual income.
The proposed guardian’s name, address, age, relationship to the respondent, and occupation.

The petition must also state whether the respondent already has a guardian or an agent under a power of attorney.⁴

The Medical Report

A report based on evaluations completed within three months of filing should accompany the petition. At least one evaluator must be a licensed physician, or for intellectual disabilities, a licensed clinical psychologist. The report must describe the disability and how it affects the respondent’s decision-making, present the results of mental and physical evaluations, and give an opinion on whether guardianship is needed and what type is appropriate. Every evaluator who contributed must sign it and list their credentials.⁵

Judges rely heavily on this document. A vague or incomplete report can sink the petition, and the evaluators may be called to testify at the hearing.⁶

The Hearing and the Respondent’s Rights

The respondent must be personally served with the petition and a summons at least 14 days before the hearing. Anyone else named in the petition, including the proposed guardian and relatives, must also be notified in person or by mail at least 14 days ahead.

At the hearing, the petitioner must prove by clear and convincing evidence that the respondent’s disability leaves them unable to make responsible decisions about their personal care, their finances, or both.¹ The judge reviews the medical report, hears testimony, and considers the recommendation of a guardian ad litem, a private attorney or trained professional appointed to investigate independently and advise the court on whether guardianship is truly needed.⁶

The respondent has substantial protections during this process. They have the right to a court-appointed attorney if they do not have one,⁷ the right to demand a six-person jury trial, the right to present evidence and cross-examine witnesses, and the right to attend the hearing unless the court finds they refuse to come or would be harmed by attending. They must be informed of these rights, and the hearing can be closed to the public on request of the respondent, their attorney, or the guardian ad litem.⁸

What a Plenary Guardian Can Do

Guardian of the Person

A plenary guardian of the person has custody of the ward and responsibility for their support, care, health, and general well-being. That includes choosing where the ward lives, arranging medical treatment, and making day-to-day decisions. The guardian also acts as a surrogate for health care decisions, including decisions about life-sustaining treatment, under the Illinois Health Care Surrogate Act.⁹

The statute constrains how those choices are made. Decisions must reflect the ward’s own preferences when they are known. If following the ward’s wishes would cause substantial harm, or if the wishes cannot be determined, the guardian falls back on what the ward would have wanted based on their values and beliefs. Only when the ward’s preferences are truly unknowable does the guardian decide on best interests alone.⁹

Some powers are off-limits even under a plenary order. A guardian cannot admit the ward to a mental health facility over the ward’s objection, cannot consent to sterilization without a separate court order, and must actively help the ward develop maximum self-reliance and independence.⁹

Guardian of the Estate

The guardian of the estate manages the ward’s income, property, and investments. Assets must be handled frugally and applied toward the ward’s support, care, and maintenance. The estate guardian also represents the ward in legal proceedings unless the court appoints someone else.¹⁰

What Rights the Ward Keeps

Plenary guardianship is sweeping but not total. A ward retains the right to vote if they have the functional capacity to do so and meet all other voting requirements. They keep the right to make their own medical decisions when they have decisional capacity in the moment, even with a plenary guardian in place. They keep the right to marry if they understand the nature of marriage. And they always keep the right to petition the court to modify or end the guardianship.

On the other side, a plenary order does produce a judicial finding of incompetence that can affect the ward’s driver’s license and firearm owner’s identification card. A guardian who wants to file for divorce on the ward’s behalf must get court approval before starting.

Ongoing Reports the Guardian Must File

The guardian of the person must submit an Annual Report Regarding Ward each year covering the ward’s physical and mental condition, current living arrangement, services they receive, and an explanation of why the guardianship should continue. The court does not send reminders; the guardian tracks the deadline and mails the completed form to the judge who issued the order.

The guardian of the estate must file verified financial accountings with the court. The first is due within 30 days after one year from the date the court issued letters of guardianship, and later accountings follow the schedule the court sets. If no specific schedule is ordered, the guardian must file at least every three years. Each accounting lists all receipts and disbursements since the last report along with supporting documentation the court requires.¹¹ Many Illinois probate courts require annual accountings in practice even though the statute allows longer intervals. Missed filings can lead to sanctions, removal, or both.

Changing or Ending a Plenary Guardianship

Plenary guardianship is not necessarily permanent. The ward, anyone acting on the ward’s behalf, or the court itself can start proceedings to modify or terminate the order. The ward can make the request by any means, including a letter, a phone call, or a visit to the court. The court may appoint a guardian ad litem to look into the request and, if the ward wants to move forward, help prepare the petition.¹²

To end a guardianship or reduce it to a limited arrangement, the ward’s capacity must be shown by clear and convincing evidence. A physician’s report is not required under the standard termination process, which makes it easier for a ward to have their case heard. The court can revoke the guardian’s authority, end the disability finding entirely, or scale back the guardian’s duties to match the ward’s current abilities.¹²

A faster track is available when the guardian and the ward both agree. If a new medical report supports the change, the ward no longer wants to be under guardianship, and the guardian agrees the change is in the ward’s best interests, the court can proceed unless someone proves by clear and convincing evidence that the ward still cannot manage their own affairs. This collaborative pathway flips the burden of proof and makes ending the arrangement significantly more straightforward.

1
Illinois General Assembly. Illinois Code 755 ILCS 5/11a-3 – Adjudication of Disability; Power to Appoint Guardian
2
Illinois Guardianship & Advocacy Commission. Guardianship Fact Sheet
3
Illinois General Assembly. Illinois Code 755 ILCS 5/11a-5 – Who May Act as Guardian
4
Illinois General Assembly. Illinois Code 755 ILCS 5/11a-8 – Petition
5
Illinois General Assembly. Illinois Code 755 ILCS 5/11a-9 – Report
6
Illinois Guardianship & Advocacy Commission. Frequently Asked Questions About Guardianship
7
Illinois Guardianship & Advocacy Commission. The Guardianship Process
8
Illinois General Assembly. Illinois Code 755 ILCS 5/11a-11 – Hearing
9
Illinois General Assembly. Illinois Code 755 ILCS 5/11a-17 – Duties of Guardian of the Person
10
Illinois General Assembly. Illinois Code 755 ILCS 5/11a-18 – Duties of the Estate Guardian
11
Illinois General Assembly. Illinois Code 755 ILCS 5/24-11 – Accounting
12
Justia Law. Illinois Code 755 ILCS 5 Article XIa – Guardians for Adults with Disabilities – Section 11a-20