What was the nature of his/her infirmity?

Claiming one of your dependants as infirm means you’ll have to give a description of their physical or mental infirmity to the Canada Revenue Agency (CRA). Your description, along with other information provided in your return, will help determine if you’re eligible to claim a dependant as infirm.

Tax tip: The CRA might ask for a signed statement from your doctor stating when the impairment began and how long it’s expected to continue. For dependants under the age of 18, the statement should say that due to their impairment, they are, and will continue to be, dependant on others for an unknown duration.

If the CRA already has an approved Form T2201: Disability Tax Credit Certificate on file for your dependant, you won’t need to get a signed statement from your doctor.