Disability Tax Credit in Canada: Eligibility, How to Apply, and Credits You Might Be Missing (2026)

The disability tax credit (DTC) is a non-refundable federal credit worth up to $9,872 in base amount for 2026, which translates to $1,481 in federal tax savings at the 15% base rate. With the provincial credit on top, total savings range from $1,700 to $2,100 depending on your province. If you also qualify for the supplement (under age 18), the combined federal base amount rises to $15,633.

At our firm, we see the DTC underused more than any other personal credit. Clients come in for help with a T1 return and mention a health condition in passing, not realizing it qualifies. Others were told years ago they did not qualify and never revisited it after the eligibility criteria expanded. In some cases, filing a retroactive DTC claim going back up to 10 years produces a refund of $15,000 or more.

This guide covers the 2026 eligibility rules, the T2201 application process, what to do if the CRA denies your claim, the retroactive strategy, and the package of related credits and programs that DTC eligibility opens up.

Who Qualifies for the Disability Tax Credit

You qualify for the DTC if you have a severe and prolonged impairment in physical or mental functions that markedly restricts your ability to perform a basic activity of daily living, or if you would be markedly restricted without life-sustaining therapy. The impairment must have lasted, or be expected to last, for a continuous period of at least 12 months.

The CRA defines “basic activities of daily living” as: speaking, hearing, walking, elimination (bowel or bladder functions), feeding, dressing, and mental functions necessary for everyday life. You do not need to be unable to perform the activity. The test is whether it takes you an inordinate amount of time compared to someone without the impairment, even with therapy, medication, and devices.

The mental functions category is broader than most people realize. It includes memory, problem solving, goal setting, judgment, and adaptive functioning. Conditions like severe ADHD, autism spectrum disorder, major depressive disorder, bipolar disorder, and PTSD can qualify when they markedly restrict mental functions necessary for everyday life. The CRA expanded its interpretation of mental functions in 2021 after sustained criticism that the criteria excluded too many applicants with mental health conditions.

Life-sustaining therapy is a separate path to eligibility. If you require therapy at least 3 times per week, with each session averaging at least 14 hours per week (including preparation and recovery time), you qualify even if your daily activities are not markedly restricted. Type 1 diabetes requiring insulin management is the most common example, though kidney dialysis and certain respiratory conditions also qualify.

At Tohme Accounting, we review every client file for potential DTC eligibility. The credit is worth enough that even a borderline case is worth pursuing with a T2201 application.

How to Apply: Form T2201

The DTC application starts with Form T2201, Disability Tax Credit Certificate. The form has two parts: Part A is completed by the person claiming the credit (or their legal representative), and Part B is completed and signed by a qualified medical practitioner.

The medical practitioner does not need to be your family doctor. Depending on the impairment, an optometrist, audiologist, occupational therapist, psychologist, or speech-language pathologist can complete Part B for their area of expertise. Choose the practitioner who knows your condition best and can describe the functional limitations in detail. The CRA looks at how the condition affects daily life, not the diagnosis itself.

The most common reason for DTC denial is a Part B that focuses on the medical diagnosis rather than the functional limitation. A form that says “patient has multiple sclerosis” without explaining that it takes the patient three times longer than normal to walk 100 metres, or that fatigue prevents them from preparing meals without extended rest, is likely to be rejected.

Practical tips for Part B:

• Ask your practitioner to describe specific functional limitations, not just the condition name
• Include the frequency and duration of the limitation (daily, weekly, how many hours)
• If the impairment is intermittent, note the cumulative effect. The CRA accepts conditions that are not constant if the overall impact on daily functioning meets the threshold
• If you receive life-sustaining therapy, log the actual hours per week including preparation and recovery

You can submit Form T2201 online through My Account or by mail to the CRA’s tax centre. Processing takes 8 to 16 weeks. If approved, the CRA updates your file and the credit applies to current and (if you request it) prior tax years.

The Retroactive Claim: Up to 10 Years Back

The DTC can be applied retroactively, and this is where the real money is. If your condition qualified in prior years but you never claimed the credit, you can request adjustments to your tax returns going back up to 10 years using Form T1-ADJ (T1 Adjustment Request) or through the CRA’s online Change My Return service.

Here is what a retroactive claim can look like for an Ontario resident:

These figures assume you had enough tax payable to absorb the credit in each year. If your income was too low to owe tax, the credit may not produce a refund (it is non-refundable). But if you had a supporting person paying tax on your behalf, the credit can transfer to them instead.

Our team at Tohme Accounting handles retroactive DTC claims as part of our personal tax work. We file the T2201, wait for approval, then submit adjustment requests for every eligible prior year in one batch. Clients are often surprised by the size of the resulting refund.

Transferring the Credit to a Family Member

If the person with the disability does not have enough taxable income to use the credit, the DTC can transfer to a supporting person. Under ITA section 118.3(2), a supporting person is a spouse, common-law partner, parent, grandparent, child, grandchild, brother, sister, aunt, uncle, niece, or nephew who provides regular support.

The transfer is automatic on the tax return. The supporting person claims the unused portion of the DTC on their own T1. The CRA calculates how much of the credit the person with the disability can use, and the rest flows to the supporting person.

This matters most for children with disabilities. A child with autism who has no income cannot use the DTC themselves, but a parent in a 40%+ marginal tax bracket receives the full benefit. Combined with the supplement for children under 18, the annual tax savings for the parent can reach $3,000 or more.

Credits and Programs the DTC Opens Up

DTC eligibility is the gateway to several other tax benefits and government programs. Many people claim the DTC but miss the connected credits, leaving money on the table.

Registered Disability Savings Plan (RDSP). DTC eligibility is the entry requirement for the RDSP, a tax-sheltered savings plan for people with disabilities. The federal government matches contributions through the Canada Disability Savings Grant (up to $3,500 per year, depending on family income) and the Canada Disability Savings Bond (up to $1,000 per year for low-income beneficiaries, with no contribution required). Over 20 years of eligibility, a person can receive up to $90,000 in government grants and bonds. Contributions are not tax-deductible, but the investment growth and government matching are not taxed until withdrawal. If you or a family member qualifies for the DTC and does not have an RDSP, contact our team. This is one of the most generous savings programs the federal government offers, and it is underused because most people do not know it exists.

Canada Disability Benefit. Starting July 2025, eligible DTC recipients between ages 18 and 64 can receive the Canada Disability Benefit, a monthly payment of up to $200. The benefit is income-tested and phases out as income rises above the threshold. It is separate from provincial disability support programs and does not affect eligibility for other federal benefits.

Medical expense tax credit interaction. DTC recipients can claim attendant care expenses of up to $10,000 (or $20,000 in the year of death) as medical expenses under ITA section 118.2, even while claiming the DTC. Without DTC eligibility, claiming attendant care as a medical expense blocks you from claiming the DTC. With DTC eligibility established first, you can claim both up to the $10,000 attendant care threshold.

Canada Caregiver Credit. A person who supports a family member with an infirmity can claim the Canada Caregiver Credit under ITA section 118(1)(d). The amount for 2026 is up to $8,375 for a dependent with an infirmity. This credit can be claimed alongside the DTC transfer.

Child Disability Benefit. Families with a child eligible for the DTC receive the Child Disability Benefit, a supplement to the Canada Child Benefit. The maximum supplement for 2026 is $3,322 per year per eligible child. It is income-tested and paid monthly as part of the CCB.

At Tohme Accounting, when a client qualifies for the DTC, we review their file for every connected benefit. The DTC on its own is worth $1,900 per year. Combined with the RDSP matching, the Child Disability Benefit, and the medical expense credit, the total annual benefit package can reach $10,000 or more. Contact us through our contact page if you think any of these apply to your family.

What to Do If the CRA Denies Your T2201

The CRA denies a significant number of T2201 applications, particularly for mental health conditions and conditions where the functional limitation is intermittent. A denial is not the end of the process.

Step 1: Request the CRA’s reasons. Call the DTC unit and ask for the specific reason the application was denied. The CRA will explain which criterion was not met, and this tells you what to address in a follow-up.

Step 2: Request a review with additional information. You can submit a request for reconsideration with new or additional medical documentation that addresses the specific deficiency the CRA identified. A letter from your medical practitioner specifically addressing the CRA’s concern (for example, clarifying that the impairment is present “all or substantially all of the time” even if symptoms fluctuate) can change the outcome.

Step 3: File a formal Notice of Objection. If the review is denied, you can file a Notice of Objection under ITA section 165 within 90 days of the notice of determination. The objection goes to the CRA’s Appeals Division, which conducts an independent review.

Step 4: Appeal to the Tax Court of Canada. If the objection is denied, you can appeal to the Tax Court. Many DTC cases are heard under the informal procedure, which does not require a lawyer and has no filing fee for amounts under $25,000. The Tax Court has overturned CRA DTC denials in numerous cases, particularly for mental health conditions.

The denial rate is high enough that a well-prepared appeal is worth pursuing. If you received a denial and believe you qualify, our team can review the CRA’s reasons and advise on whether a reconsideration or objection makes sense for your case.