Is a Mental Health Act assessment the same as a Substitute Decisions Act capacity assessment in Ontario?

No, they're different assessments serving different purposes, even though both can come up around the same time for someone experiencing a mental health crisis. An assessment under the Mental Health Act is generally concerned with whether someone meets the criteria for psychiatric evaluation or, in more serious cases, involuntary admission to a psychiatric facility, focused on immediate safety and treatment needs, and is carried out by a physician under that Act's own specific rules and forms.

A capacity assessment under the Substitute Decisions Act is a separate process, focused specifically on whether someone is legally capable of managing their property or personal care more broadly, and must be conducted by a qualified capacity assessor recognized under that Act, applying its own distinct legal test. Someone admitted involuntarily under the Mental Health Act isn't automatically found incapable of managing property or personal care under the Substitute Decisions Act — that's a separate legal question requiring its own assessment if it's genuinely at issue. Because these processes are easy to conflate but lead to different legal consequences, get legal advice if you're unsure which framework actually applies to your family member's situation.