Disability Tax Credit for Dementia and Alzheimer's: What Families Need to Know
Dementia and Alzheimer's disease are among the most common conditions we see in DTC applications — and among the most frequently missed. Many families spend years caring for a loved one with dementia without ever applying for the Disability Tax Credit, often because they assume the credit is only for physical disabilities, or because the application process feels too complex to navigate while managing caregiving responsibilities.
The reality is that dementia and Alzheimer's disease typically qualify for the DTC under the mental functions category — and the credit can be claimed retroactively for up to 10 years, including after the person has passed away.
Why Dementia Qualifies for the DTC
The CRA's mental functions category covers the ability to perform mental functions necessary for everyday life, including memory, problem-solving, goal-setting, judgment, and adaptive functioning. Dementia and Alzheimer's disease cause progressive deterioration in all of these areas. As the condition advances, the person becomes unable to manage their own finances, medications, daily schedule, or personal care — meeting the CRA's definition of a marked restriction.
The key is that the T2201 must describe the functional impact of the condition — not just the diagnosis. A form that says 'patient has Alzheimer's disease' is insufficient. The form needs to describe specifically how the condition restricts the patient's ability to perform the mental functions listed above, and confirm that this restriction is present at least 90% of the time despite appropriate treatment.
When Does the Qualifying Period Begin?
For dementia and Alzheimer's, the qualifying period typically begins when the condition progresses to the point of causing a marked restriction — not at the time of initial diagnosis. Early-stage dementia may not yet meet the threshold, while moderate to severe dementia almost always does. A neurologist, geriatrician, or family physician who has followed the patient over time is best positioned to identify when the marked restriction began.
This distinction matters significantly for retroactive claims. If a person was diagnosed with Alzheimer's in 2018 but did not reach the marked restriction threshold until 2020, the retroactive window runs from 2020 — not 2018. Getting the start date right is one of the most important aspects of a well-prepared DTC application.
Claiming the DTC While the Person Is Still Living
If your family member is currently living with dementia or Alzheimer's and has not yet applied for the DTC, you can apply on their behalf as a supporting person. If the person with dementia does not have enough taxable income to use the credit themselves — which is common, as many people with advanced dementia are no longer working — the unused portion of the credit can be transferred to a spouse, adult child, or other supporting family member who provides care.
Claiming the DTC After Death
If your family member has passed away, the estate can still apply for the DTC. A T2201 can be completed after death by a practitioner who treated the person during their lifetime, based on medical records. The estate can then claim the DTC on the terminal return and file T1 adjustment requests for up to 10 prior years. Any refunds flow to the estate and are distributed according to the will.
For a 10-year retroactive claim, the total refund to the estate could be between $19,000 and $26,000 or more, depending on the province and the deceased's income. These are illustrative estimates — actual amounts depend on individual tax circumstances.
How My Benefits Canada Helps
At My Benefits Canada, we specialize in DTC applications for conditions like dementia and Alzheimer's disease — both for living applicants and for estates. We work directly with the treating physician or specialist to ensure the T2201 uses CRA-aligned functional language that accurately reflects the progression of the condition. We also manage the retroactive adjustment process, so that families and executors do not need to navigate the CRA's administrative requirements on their own.
Our fee is 25% of the retroactive refund only, collected after approval. If the application is not approved, you pay nothing. There is no cost to explore whether your family member — living or deceased — may qualify.
Start Your Assessment
Start your free eligibility assessment to find out whether your family member with dementia or Alzheimer's may be entitled to a retroactive DTC refund — whether they are currently living or have passed away.