In Ontario, guardianship of property for autistic adults is governed by the Substitute Decisions Act, 1992. A guardian of property manages financial decisions when an individual is incapable of doing so. The court application process through the Ontario Superior Court costs $3,000-$10,000 in legal fees. Less restrictive alternatives include powers of attorney, RDSP-specific trustees, and supported decision-making arrangements. Guardianship should only be pursued when less intrusive options are insufficient.
Start with the short answer, then reveal deeper context where helpful.
Guardianship of property gives one person (the guardian) legal authority to make financial decisions for another person. In the context of autism, this may be considered when an autistic adult is assessed as incapable of managing property (money, investments, real estate). A capacity assessor designated under the SDA must conduct a formal assessment. Being autistic does not automatically mean a person is incapable.
If a power of attorney was not created while the person had capacity, guardianship requires a court application to the Ontario Superior Court of Justice. The application requires: a capacity assessment by a designated capacity assessor, a management plan for the person's property, financial disclosure, and notice to the incapable person and their family members. The incapable person has the right to legal representation.
Ontario law favours the least restrictive option. Before pursuing guardianship, consider: a power of attorney for property (if the person has capacity to grant one), a representative payee arrangement for government benefits, an RDSP trustee for disability savings, supported decision-making where a trusted person helps the individual make their own decisions, and informal support arrangements for day-to-day finances.
Guardianship of property gives one person (the guardian) legal authority to make financial decisions for another person. In the context of autism, this may be considered when an autistic adult is assessed as incapable of managing property (money, investments, real estate). A capacity assessor designated under the SDA must conduct a formal assessment. Being autistic does not automatically mean a person is incapable.
Ontario law presumes every adult is capable unless assessed otherwise. The assessment evaluates whether the person understands the nature and value of their property, the obligations they owe to their dependants, and whether they can develop a plan for managing their financial affairs. Many autistic adults are fully capable of managing their finances, particularly with appropriate supports.
If a power of attorney was not created while the person had capacity, guardianship requires a court application to the Ontario Superior Court of Justice. The application requires: a capacity assessment by a designated capacity assessor, a management plan for the person's property, financial disclosure, and notice to the incapable person and their family members. The incapable person has the right to legal representation.
Legal fees typically range from $3,000 to $10,000 depending on complexity. Legal Aid Ontario may be available for families who qualify financially. The Office of the Public Guardian and Trustee (OPGT) may be appointed if no suitable private guardian is available. The court reviews the guardian's suitability and the necessity of guardianship over less restrictive alternatives.
Ontario law favours the least restrictive option. Before pursuing guardianship, consider: a power of attorney for property (if the person has capacity to grant one), a representative payee arrangement for government benefits, an RDSP trustee for disability savings, supported decision-making where a trusted person helps the individual make their own decisions, and informal support arrangements for day-to-day finances.
ARCH Disability Law Centre and Community Living Ontario can provide guidance on alternatives to guardianship. Many autistic adults who struggle with financial management can succeed with appropriate supports (budgeting tools, bill payment automation, periodic check-ins) rather than losing their legal right to make financial decisions.
SDA
Substitute Decisions Act, S.O. 1992, c. 30 — Guardianship of Property Provisions
ARCH
ARCH Disability Law Centre — Alternatives to Guardianship: A Guide for Families (2023)
Supported decision-making as an alternative to guardianship for autistic adults in Ontario. Preserves autonomy while providing assistance with complex decisions.
How substitute decision-making works for autistic individuals in Ontario under the Health Care Consent Act and Substitute Decisions Act. Covers hierarchy, appointment, and rights.
Children age out of OAP at 18 with no automatic transfer to adult services. Learn about the transition gap, Passport, ODSP, and planning ahead.
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.
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