Disability Tax Credit Calculator

For the 2025 tax year the federal disability amount is $10,138, claimed at the lowest federal rate of 14.5%. That works out to roughly $1,470 off federal tax owing. Most provinces add a credit on top, so an Ontario claimant would add about $520, for a combined 2025 figure near $1,990.

The Disability Tax Credit is a non refundable tax credit. It reduces the income tax you owe rather than paying you a lump sum, which is why the amount you actually receive depends on the tax you paid in each tax year.

Each tax year has a set disability amount, and that base amount is multiplied by the lowest tax rate to produce a credit against tax you owe. The federal rate was 15% from 2016 through 2024 and 14.5% in 2025. Each province applies its own base amount and its own lowest rate, so two people with an identical impairment can see a different disability tax credit amount depending on where they live.

Claiming every tax year from 2016 through 2025 comes to about $13,196 in federal credit before any provincial amount is added. Individual years above are rounded, so they may not sum to exactly that figure. Retroactive years are only worth what you can actually use against income tax you paid in those years.

The provincial credit is calculated the same way, using each province’s own disability amount and lowest tax rate. Alberta and Saskatchewan carry the largest provincial amounts, while British Columbia and Ontario carry the lowest rates. This disability tax credit calculator covers the ten provinces and territories listed below. Quebec, Yukon and the Northwest Territories are not included.

A person under 18 at the end of the tax year may also qualify for a supplemental amount on top of the base amount. The supplemental amount is reduced by certain child care and attendant care expenses claimed for the same child, so it varies from family to family. This calculator estimates the adult disability amount only, so a family claiming for a child should treat its result as a floor rather than a ceiling.

Because this is a non refundable tax credit, it can only reduce tax you actually owed. If there was little or no income tax owing in a given tax year, the usable amount for that year is lower than the maximum estimate. Entering the tax you paid into the calculator shows the narrower, more realistic figure.

Where the person with the impairment cannot use the full credit, the unused portion may be transferred to a spouse or common law partner, or to a supporting family member on whom that person depends for basic necessities. That transfer is what makes the credit useful to families where the eligible person has little taxable income.

If the person with the impairment cannot use the full disability amount, the unused portion may be transferred. It can go to a spouse or common law partner, or to a supporting family member such as a parent, grandparent, child, sibling, aunt, uncle, niece or nephew who the person depends on for basic necessities.

This matters most where the eligible person has little or no taxable income. A child, a student, or an adult who has not worked during the retroactive years may generate very little credit on their own return, while a supporting family member who paid tax in those same years can often use it. Where a transfer applies, run the calculator against the tax the supporting person paid rather than the tax the eligible person paid.

The calculator gives more accurate results when you have a few things to hand. You do not need any of them for a rough estimate.

• Your approved disability tax credit certificate, if the Canada Revenue Agency has already approved one
• Your notices of assessment or tax returns for the previous years you want to check
• The province where the person with the impairment lived during those years
• The income tax paid in each of those tax years

Select the province first, because the provincial disability amount and rate change the total more than any other input. Then set the first and last tax year you want to include. The calculator covers 2016 through 2025, which matches the ten years the CRA may reassess.

The tax paid field is optional, but it is the difference between a maximum estimate and a realistic one. Enter the total income tax you paid across the years selected. The calculator caps your usable amount at that figure, because a non refundable credit cannot reduce your tax below zero.

The result splits into a federal credit and a provincial credit, with a per year breakdown underneath. Treat the headline number as a ceiling. It assumes you were eligible in every tax year selected and that you paid enough income tax to use the credit in full.

Eligibility rests on a severe and prolonged impairment in physical or mental functions. Prolonged means the impairment has lasted, or is expected to last, a continuous period of at least 12 months. Severe means it markedly restricts your ability to perform basic activities of daily living.

The Canada Revenue Agency looks at walking, dressing, feeding, speaking, hearing, elimination, and the mental functions necessary for everyday life. Vision is assessed on what you can see with corrective lenses or medication. Markedly restricted means a basic activity takes an inordinate amount of time, all or substantially all of the time, even with appropriate therapy, devices and medication. Because the test is about function rather than diagnosis, two people with the same condition may not both be markedly restricted.

A qualified medical practitioner must certify the impairment. Depending on which activity is being certified, that may be a medical doctor, a nurse practitioner, an optometrist, an audiologist, an occupational therapist, a physiotherapist, a psychologist or a speech language pathologist.

The Disability Tax Credit itself makes no payments. It is a non refundable credit that reduces income tax owed, which is why the calculator asks about tax paid rather than income received.

Approval matters beyond the credit, though. An approved certificate is a requirement for opening a Registered Disability Savings Plan, and for the child disability benefit, which is paid as monthly payments alongside the Canada child benefit for an eligible child under 18. Families often find these related payments worth more over time than the tax credit that unlocked them.

The DTC application is made on the disability tax credit certificate, Form T2201. You complete Part A of the form with your own details, and the details of anyone claiming on your behalf. Your medical practitioner completes Part B of the form, describing how the impairment affects you rather than naming the condition. The completed form goes to the Canada Revenue Agency for review.

Processing times vary. Once the completed application is submitted, review can take several weeks to a few months depending on case complexity and volume. The CRA may write to your practitioner for more information before it decides.

If the CRA approves your certificate, prior tax years can be reassessed, potentially up to 10 years. That is why this calculator covers the 2016 through 2025 tax years. What you receive depends on whether you were eligible in each year and how much income tax you paid.

Retroactive claims are made by asking the CRA to reassess the affected tax returns, usually with a T1 adjustment request for each year. Where the certificate already states the year the impairment began, the CRA will often apply the retroactive credits without a separate request for every year.

There is no standard figure. Your retroactive amount is the sum of the per year credits for the years you were eligible, capped by the income tax you actually paid in those years. Someone who paid little tax across the period may receive very little, even with a long eligibility window, unless the credit is transferred to a spouse or supporting family member.

There is no single $40,000 credit. The figure circulates because a long retroactive claim, combined across ten tax years, federal and provincial amounts, and in some cases a child supplement and a transfer to a supporting family member, can reach that order of magnitude. It is not an entitlement and it is not a typical outcome. The only way to know your own number is to work from the tax years you were eligible and the tax you paid.

Run the DTC calculator with your province, your eligible tax years and the tax you paid. If the result looks worth pursuing, the next step is the disability tax credit certificate, not the calculator.