Guardianship for a Disabled Child Turning 18 in Wisconsin

The day your child turns 18, Wisconsin law treats them as an adult for decision-making — regardless of their diagnosis. There's no automatic exception for autism, intellectual disability, Down syndrome, or any other condition. Under the default rule, the rights held by parents transfer to the adult, but a court-appointed guardian or the adult's valid authorization can change who may act or participate. If you haven't planned ahead, you may find yourself locked out of medical appointments, IEP meetings, and financial accounts overnight.

What Actually Changes at 18

On your child's 18th birthday, several things happen simultaneously under Wisconsin law:

• Medical decisions: Hospitals and clinics generally cannot share protected health information with you or accept your consent for treatment simply because you are the parent; you need the adult's authorization or another applicable legal authority. HIPAA applies fully.
• Educational rights: Under Wis. Stat. § 115.807(3), special education decision-making rights transfer from you to the student. The district must still provide required notices to both the adult student and parents, while record access and participation may require authorization; a financially dependent adult student's parents may retain pupil-record access unless the student blocks it in writing.
• Financial autonomy: Your child can sign contracts, open credit accounts, and make binding financial decisions. Banks may freeze joint accounts or require new authorization.
• Voting and civil rights: Your child gains the right to vote, marry, and enter legal agreements.

None of this transfer is based on your child's diagnosis or functional abilities; it occurs by the default age-of-majority rule, subject to a court-appointed guardianship or valid authorizations.

The Planning Timeline

Wisconsin gives families a specific window to prepare. The recommended sequence starts well before the 18th birthday:

Age 14: The school district must begin formal transition planning within the IEP, including postsecondary goals for employment, education, and independent living.

Age 17: During the IEP year when the student turns 17, the school provides DPI Form M-6 (notification of upcoming transfer of rights). On the 18th birthday, the school sends Form M-7 to the student and Form M-8 to the parent — official notice of the transfer. For many families, this is the wake-up call.

8 months before 18: Evaluate your child's functional capacity. Can they understand the concept of appointing a supporter or agent? If yes, draft the appropriate non-court documents. If not, begin preparing a guardianship petition.

17 years and 9 months: You can file a guardianship petition under § 54.10(3)(a)1. This timing allows the court process to conclude on or near the 18th birthday.

Age 17½: Contact your county's Aging and Disability Resource Center (ADRC) to initiate adult functional screening for long-term care waivers like IRIS or Family Care.

18th birthday month: Apply for adult SSI if your child qualifies — parental income deeming stops at 18, so many previously ineligible children now qualify.

Guardianship Isn't the Only Path

Wisconsin law requires courts to consider less-restrictive alternatives before granting guardianship (§ 54.10(3)(a)4). And for many families, a combination of simpler tools provides all the authority they need:

Supported Decision-Making Agreement (Chapter 52): Your child names you as a "supporter" who helps them gather information, think through options, and communicate decisions. No rights are removed. The adult stays the legal decision-maker.

Health Care Power of Attorney (Chapter 155): Your child appoints you as their healthcare agent. Authority activates only when two physicians (or one physician and one advanced practice clinician) personally examine the principal and sign a written finding that they lack capacity — otherwise, your child directs their own medical care.

Financial Power of Attorney (Chapter 244): Delegates financial management to an agent. Can be structured as immediately effective or springing (activating upon incapacity).

FERPA consent / Educational delegation: Maintains your role in IEP planning and your access to school records after the transfer of rights.

All of these use free state forms, require no court involvement, and preserve your child's legal rights and autonomy.

When Guardianship Is Necessary

If your child cannot understand the concept of appointing a supporter or agent — if they lack the cognitive capacity to sign a power of attorney or an SDM agreement — these non-court tools aren't available. Guardianship becomes the path.

Even then, Wisconsin distinguishes between limited and full guardianship. A limited guardianship transfers only the specific powers the court determines are necessary, while preserving all other rights. Full guardianship can grant broader authority over personal care and financial affairs, but the court's order and specific statutory findings determine which powers and rights are transferred.

The court decides the scope based on the medical evaluation (Form GN-3130), the GAL's recommendation, and the evidence presented at the hearing.

What This Costs

Using the non-court alternatives (SDM, POAs, FERPA releases) costs nothing if you use the free state forms. Guardianship costs include:

• Court filing fees (vary by county)
• GAL deposit ($200–$500 in the cited counties; Waukesha County requires an initial minimum deposit of $2,000 in contested family or guardianship matters)
• Attorney fees ($2,500–$10,000+ if you hire counsel, though pro se filing is possible)
• Inventory filing fees under § 814.66 (estate guardianship)
• Ongoing annual reporting (Forms GN-3480 and GN-3500, due every April 15)

The Wisconsin Adult Guardianship & Alternatives Guide covers the complete decision framework — how to evaluate which tools fit your child's specific situation, the exact forms and execution requirements for each option, and a step-by-step petition walkthrough if guardianship is the right call.

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