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At age 18, the law presumes every adult is capable. For families of autistic adults with high support needs, assuming legal decision-making authority requires specific legal steps.
The crisis that leads families here
Parents navigating guardianship decisions at 18 are often the same families who waited years for early intervention that could have supported greater independence for their child.
Registered
88,175Children registered
Total in the Ontario Autism Program queue
CBC FOI Jan 2026
Funded
20,666Have active funding
Just 23.4% of registered children
CBC FOI Jan 2026
Waiting
67,509Still waiting
Registered. Diagnosed. Un-funded.
CBC FOI Jan 2026
Verified — CBC FOI Jan 2026
| Metric | Value |
|---|---|
| Children registered | 88,175 |
| Have active funding | 20,666 |
| Still waiting | 67,509 |
Understand the hierarchy of decision-making supports from least to most restrictive.
A legal document where a capable adult appoints someone to make decisions for them.
Court-appointed authority to make decisions for someone found mentally incapable.
Informal arrangement where trusted people help an individual understand and make choices.
In Ontario, guardianship is divided into two distinct categories. You can apply for one or both.
Managing bank accounts, paying bills, signing contracts, managing investments.
Medical consent, housing decisions, safety, nutrition, and hygiene.
A formal assessment by a designated Capacity Assessor ($500-$900 cost) proving incapacity.
You must submit a detailed plan to the Public Guardian and Trustee (PGT) on how you will manage decisions.
A lawyer files your application with the Superior Court of Justice. PGT reviews and comments.
A judge grants the guardianship order. You are now legally accountable for decisions.
The financial cost of guardianship varies by path. Budget accordingly.
$500 – $900
Conducted by a designated Capacity Assessor (list maintained by the Capacity Assessment Office). Required before court application.
$3,000 – $8,000+
Lawyer fees for preparing and filing the court application. Uncontested applications (no one opposes) are at the lower end. Contested cases cost significantly more.
$0 – $500
If the individual has capacity to understand and grant POA, this can be done with a lawyer for $300-$500 or using free templates from the Ontario government. Far simpler than guardianship.
If a parent or caregiver suddenly cannot provide care (illness, death), and no guardianship or POA is in place:
This is why advance planning before the 18th birthday is critical. Do not wait for an emergency to establish legal authority.
Yes. In Ontario, at age 18, all individuals are presumed capable of making their own decisions unless a court or capacity assessor determines otherwise. Parents do not automatically remain guardians.
Power of Attorney (POA) is voluntary—the individual chooses you while they are capable. Guardianship is court-ordered—a judge appoints you because the individual is verified as mentally incapable of making that specific type of decision.
Yes. For ODSP specifically, you can apply to be a "Trustee" just for those government payments. This is a simpler process than full guardianship of property.
Commitment to Accuracy: Our data is verified against official government reports (FAO, MCCSS), peer-reviewed scientific literature, and accessible public records. Last updated: March 24, 2026.
Related Resources
Verified Facts
88,175 — children are registered in the Ontario Autism Program
US$2.4M — Lifetime support costs for autism with co-occurring intellectual disability can reach US$2.4 million per person (Buescher et al.)
1 in 50 — According to the 2019 Canadian Health Survey on Children and Youth, about children and youth aged 1 to 17 in Canada had an autism diagnosis
23.4% — Only 20,666 children have active funding agreements () — less than one in four
WHO recommends accessible, community-based early interventions for children with autism — timely evidence-based psychosocial interventions improve communication and social engagement