Conditions That May Qualify for the Disability Tax Credit
CRA approves functional impairments, not diagnoses. Any condition that markedly restricts a basic activity of daily living for 12 or more months may qualify. Explore our detailed guides for 18 of the most common qualifying conditions.
Updated: By Ali Anjum, DTC ConsultantReviewed by: Anil Vasaya, Disability Tax Credit Specialist
How to use this hub. Each card opens a plain-English guide for that condition. The comparison table below the cards shows the CRA functional category, who can certify Part B, and one key eligibility consideration per condition, all drawn from CRA's published criteria. For certifier roles by category, see the medical practitioner DTC guide. None of the figures on this page are refund promises or approval-rate estimates.
Important: DTC eligibility is based on functional restriction, not diagnosis. A condition must markedly restrict one or more basic activities of daily living at least 90% of the time, or require 14 or more hours per week of life-sustaining therapy. Always consult a qualified tax professional. Not affiliated with CRA.
Browse All 18 Condition Guides
Each guide explains CRA's eligibility criteria, the DTC categories that apply, and documentation tips. Click a card to open the guide for that condition.
CRA functional category, who can certify Part B, and one key eligibility consideration per condition. Sourced from CRA's published criteria and authorized practitioner list.
20/200 visual acuity or 20-degree visual field is the certification threshold
What this table does not show. Refund dollar amounts and condition-level approval rates are deliberately left out. CRA does not publish those figures, so any number presented here would be editorial guesswork. Your refund depends on your federal and provincial credit, taxable income, retroactive years, and family situation. Use our calculator for an estimate tied to your own numbers, then verify the result before filing.
Condition Keyword Map
Most condition searches are really asking: does this diagnosis qualify for the Disability Tax Credit? The safer answer is that CRA decides based on functional restriction, not diagnosis alone.
CRA does not approve diagnoses. It approves functional impairments.
The key question is not "what condition do you have?" The key question is: "how does it restrict your daily functioning?" The impairment must:
Markedly restrict one or more basic activities of daily living (vision, hearing, walking, speaking, eliminating, feeding, dressing, or mental functions)
Apply all or substantially all of the time (90%+ of days)
Have lasted, or be expected to last, at least 12 consecutive months
Be certified by a qualified medical practitioner on Form T2201
There is also a therapy route. A condition that requires 14+ hours per week of life-sustaining therapy, such as insulin-dependent Type 1 diabetes, may qualify through that rule.
No. CRA does not approve diagnoses. CRA approves functional impairments. Two people with the same diagnosis can have very different DTC outcomes depending on how much the condition restricts basic activities of daily living. The diagnostic label on its own carries no weight in the CRA assessment.
Broad disability discussions often group disabilities into physical or mobility, sensory, cognitive or learning, mental health, neurodevelopmental, chronic illness, and episodic or invisible disabilities. The DTC does not approve people by those broad labels. CRA reviews whether the condition creates a severe and prolonged functional restriction in a recognized DTC activity or through the cumulative-effect rule.
Hidden disabilities can include ADHD, autism, anxiety, depression, PTSD, bipolar disorder, chronic pain, fibromyalgia, Crohn's disease, diabetes, hearing loss, and some mental health or neurological conditions. A hidden condition may support a DTC claim only when the functional restriction is clearly documented. Start with the relevant condition guide and the doctor letter guide when preparing evidence.
There is no official CRA list of hardest conditions to prove. In practice, episodic, invisible, mental health, chronic pain, fatigue, and cumulative-effect claims often need more detailed documentation because the restriction is not always visible in a short appointment. The strongest files explain frequency, duration, treatment, extra time, support needs, and daily impact without relying on diagnosis alone.
There is no single official "most overlooked" DTC disability. Commonly missed situations include hidden disabilities, mental functions restrictions, cumulative effects from multiple moderate impairments, and conditions where the person assumes work or school activity means they cannot qualify. The key question is whether daily function is markedly restricted under CRA's criteria.
In broad Canadian disability reporting, pain, flexibility, mobility, and mental health-related disabilities are commonly discussed. For the Disability Tax Credit, the more important question is not how common the diagnosis is, but whether the person has a severe and prolonged restriction in a DTC-recognized activity. Use the condition guides on this page to compare the functional category that best matches the situation.
It depends. If medication fully removes the restriction during waking hours, CRA may deny under the "controlled with therapy" clause. If you still experience restriction at least 90% of the time, you may still qualify.
A therapy routine may also matter if it takes 14 or more hours per week. Document residual restriction, side effects, and therapy time on Part B. See our DTC denied appeal guide if a previous claim was rejected on this ground.
The cumulative effect rule can apply when no single restriction reaches the marked threshold. Two or more partial restrictions may still combine into a marked overall limitation. This is a common path for conditions like ADHD plus anxiety, chronic pain plus fatigue, or arthritis plus mental fog. The form should explain the extra support, extra time, and daily impact clearly.
For mental functions, CRA accepts a medical doctor, nurse practitioner, or registered psychologist. For autism speech impairments, a speech-language pathologist may also certify. The practitioner must have direct knowledge of the patient and the duration of the impairment.
No. The 18 conditions on this page are the most commonly searched, not an exhaustive list. CRA approves functional impairment regardless of the underlying diagnosis. If your condition markedly restricts a basic activity of daily living for at least 12 months, you may qualify. Use our eligibility guide to check your specific situation, or open the resources hub for the official CRA pages.
Official Sources and Related Guides
This page is based on CRA and Government of Canada Disability Tax Credit information, plus related site guides that explain eligibility, Form T2201, estimates, and benefit interactions in plain language.
Ali AnjumDTC Consultant, Disability Tax Credits Canada
Ali has helped Canadians with a wide range of conditions understand which CRA functional category their impairment fits under, which practitioner can certify Part B, and how the cumulative-effect rule changes the outcome. The 18-condition reference table on this page is reviewed twice per year against CRA's current eligibility criteria.
YMYL disclaimer. This page is educational only and does not constitute medical, tax, legal, or financial advice. DTC eligibility is determined by CRA based on individual Part B documentation, not on the condition name. We do not publish refund-dollar estimates or approval-rate percentages because CRA does not publish those numbers and any estimate would be speculative. Always confirm eligibility with a qualified medical practitioner and the Canada Revenue Agency.
Estimate Your DTC Amount
Use our free calculator to see how much federal and provincial credit your condition may generate, including retroactive amounts up to 10 years.
