By Disability Tax Credit (DTC): Who Qualifies, Form T2201 and the Back-Filing Refund Windfall
The disability tax credit (DTC) is worth more than most eligible Canadians realize. For the 2026 tax year, the federal disability amount is $10,341. At the 14% lowest federal rate, that is about $1,448 off your federal tax every year, plus a provincial credit on top. For a child under 18, an extra supplement of $6,032 brings the federal saving to about $2,292 a year. And because approval can be backdated, a first-time claim can produce a refund covering up to 10 earlier tax years — often several thousand dollars. This guide explains who actually qualifies, how Form T2201 works, and how the back-filing refund happens.
The DTC at a glance (2026)
| Item | 2026 amount | What it is worth |
|---|---|---|
| Federal disability amount (adult) | $10,341 | About $1,448 in federal tax (at 14%) |
| Supplement, child under 18 at year-end | $6,032 | About $844 more in federal tax |
| Combined amount for a child | $16,373 | About $2,292 in federal tax |
| Provincial / territorial credit | Varies by province | Roughly $500 to $900 more for an adult in most provinces |
| Back-filing window | Up to 10 prior tax years | Refunds for every approved year you had tax payable |
Amounts are the CRA’s indexed figures for the 2026 tax year, claimed on the return you file in 2027. For the 2025 tax year the amounts were $10,138 and $5,914 — back-year claims use each year’s own amount and rate. The DTC is non-refundable: it reduces tax you owe, but it does not create a payment on its own. If the person with the impairment does not owe enough tax to use it, the unused amount can usually be transferred to a supporting spouse, parent or other supporting family member.
Who qualifies: severe, prolonged, and markedly restricted
The legal test has three parts. The impairment must be severe, it must be prolonged — it has lasted, or is expected to last, at least 12 continuous months — and it must markedly restrict the person in a basic activity of daily living, all or substantially all of the time (the CRA generally reads this as at least 90% of the time), even with therapy, medication and devices. The certified categories are:
- Seeing, speaking and hearing
- Walking, feeding and dressing
- Eliminating (bowel or bladder function)
- Mental functions necessary for everyday life — memory, problem-solving, goal-setting, judgement and adaptive functioning
- Life-sustaining therapy — therapy needed to support a vital function, generally at least 14 hours a week (rules count time spent on specific tasks such as insulin dosing and carbohydrate counting for type 1 diabetes)
There is also a cumulative effect route: if no single activity is markedly restricted, but two or more activities are significantly restricted and together equal a marked restriction nearly all the time, the person can still qualify. This route is missed often, especially for combinations such as slow walking plus limited mental functions.
A diagnosis alone does not qualify you, and the CRA does not publish a list of qualifying conditions. What matters is the effect of the impairment on daily life, described by the medical practitioner. That is why two people with the same diagnosis can get different decisions.
Form T2201: the two-part application
Part A is completed by the person applying (or their legal representative). It includes a key choice: you can ask the CRA to automatically adjust your prior-year returns for every year the practitioner certifies. Tick that box — it is the simplest route to the back-filing refund. Part B is completed and certified by a medical practitioner: a medical doctor or nurse practitioner can certify all categories; an optometrist can certify vision, a speech-language pathologist speaking, an audiologist hearing, an occupational therapist walking, feeding and dressing, a physiotherapist walking, and a psychologist mental functions.
You can submit the form through CRA My Account, by mail, or have the practitioner submit the digital version. Applying to the CRA is free; a practitioner may charge a fee to complete Part B, and that fee may be claimable as a medical expense. Use the current version of the form — the CRA no longer accepts pre-2023 versions. Two warnings: never pay a promoter a percentage of your refund just to file a free form, and never let anyone exaggerate the effects described in Part B — the practitioner must certify effects they can support.
Worked example: the back-filing refund
Illustration only, using federal amounts and ignoring small year-to-year indexation differences. Suppose Amara is approved in 2026, and her practitioner certifies that her impairment began in 2019. She had tax payable in each year but never claimed the DTC.
| Year block | Years | Approx. federal saving per year | Subtotal |
|---|---|---|---|
| Earlier years at 15% on that year’s amount | 2019–2024 (6 years) | About $1,350–$1,480 | About $8,400 |
| 2025 at the blended rate on $10,138 | 2025 (1 year) | About $1,470 | About $1,470 |
| Provincial credits on the same years | 7 years | Varies | Often $3,500–$6,000 more |
The combined federal and provincial adjustment in a case like this commonly lands in the $10,000 to $16,000 range — before counting what approval unlocks next. Your number depends on whether you actually had tax payable in each year: the credit cannot refund tax you never paid, which is why transferring the credit to a supporting family member matters in low-income years.
What approval unlocks (this is the real prize)
The DTC is a gateway credit. Approval is required to open a Registered Disability Savings Plan (RDSP), where government grants can add up to $70,000 over a lifetime. It is also required for the Canada Disability Benefit for working-age adults, and for the Child Disability Benefit, which is paid with the Canada Child Benefit — see the payment schedule in our Canada benefit payment dates guide. Families who claim the DTC but never open the RDSP leave the largest amount of money on the table.
How you actually claim it on your tax return
Once the CRA approves Form T2201, claiming is simple and repeats every year of the approved period. An adult claims the disability amount on line 31600 of their own return. If the person with the impairment does not need the full amount to reduce their tax to zero, the unused portion is claimed by a supporting family member on line 31800 — the CRA’s term for the transfer is the “disability amount transferred from a dependant,” and the supporting person must be someone the person with the impairment relied on for basic necessities such as food, shelter or clothing. Keep the CRA’s notice of determination (the approval letter) — you do not resubmit the T2201 with your return, but the CRA can ask for it, and the letter shows the first and last approved years, which is also what an RDSP provider will ask to see.
Common mistakes
- Assuming your diagnosis is not on “the list.” There is no condition list. Effects on daily life decide the claim.
- Not ticking the adjust-my-prior-returns box in Part A. Without it, you must file a T1 Adjustment Request (Form T1-ADJ) yourself for each back year, up to 10 years.
- Describing your best days. Part B should describe your functioning at its typical worst-restricted state, with the time it takes you to do an activity compared with someone without the impairment.
- Paying a promoter 20–30% of the refund. The application is free. A tax professional can help for a flat fee if your case is complex — filing software also handles the claim once you are approved; see our best tax software comparison.
- Giving up after a denial. You can send more information, ask for a review, or file a Notice of Objection within 90 days of the decision. Many denials are paperwork problems, not eligibility problems.
- Forgetting the expiry date. Some approvals are time-limited. Diary the renewal before the final approved year, or the credit, and RDSP grant eligibility, can stop.
Frequently asked questions
How much is the disability tax credit worth in 2026?
The federal disability amount is $10,341 for 2026. At the 14% lowest federal rate, that is about $1,448 off federal tax for an adult, plus a provincial credit. A child under 18 gets an added $6,032 supplement, for a combined federal saving of about $2,292.
How far back can I claim the DTC?
Up to 10 prior tax years, if your practitioner certifies the impairment existed in those years and you ask the CRA to adjust your returns in Part A of Form T2201 (or file Form T1-ADJ for each year). Refunds only arise for years where tax was payable by you or by the family member the credit is transferred to.
Do I need a specific diagnosis to qualify?
No. The CRA decides on the effects of the impairment: it must be severe, last at least 12 months, and markedly restrict a basic activity of daily living (or two activities through the cumulative-effect rule, or require life-sustaining therapy of at least 14 hours a week).
Who can certify Form T2201?
A medical doctor or nurse practitioner can certify every category. Specialists can certify their own areas: optometrists (vision), audiologists (hearing), speech-language pathologists (speaking), occupational therapists (walking, feeding, dressing), physiotherapists (walking) and psychologists (mental functions).
Can the credit be transferred if the person owes no tax?
Yes. If the person with the impairment cannot use the full credit, the unused portion can generally be transferred to a supporting spouse, common-law partner, parent, grandparent, or certain other supporting family members who the person relied on for basic necessities.
What happens if my application is denied?
You can provide additional information and ask the CRA to review, reapply with a clearer Part B, or file a Notice of Objection within 90 days. Denials are often caused by a Part B that does not describe the restriction in the CRA’s terms, not by the condition itself.
Bottom line: If a severe impairment has restricted your daily life for a year or more, apply — the form is free, the 2026 credit is worth about $1,448 federally per year (about $2,292 for a child) plus provincial amounts, approval can refund up to 10 back years, and it unlocks the RDSP and other disability benefits. This article is general information, not tax advice; for a complex case, speak with a qualified tax professional.
