How Much Is the Disability Tax Credit Worth — and Who Determines That?

If you've heard that people with disabilities can reduce what they owe at tax time, you're right — but the answer to "how much" isn't a single number. The Disability Tax Credit (DTC) is a non-refundable federal tax credit available to eligible Canadians with a severe and prolonged impairment. The dollar value depends on several moving parts: your age, your province, whether you have dependents, and how much federal tax you actually owe.

This article breaks down how the credit is structured, what factors shape its real-world value, and why two people with similar conditions can end up with very different outcomes.

What Is the Disability Tax Credit?

The DTC is a non-refundable tax credit issued by the Canada Revenue Agency (CRA). "Non-refundable" means it can reduce your federal income tax to zero — but it won't generate a refund beyond that. If you owe little or no tax, the credit's practical value shrinks accordingly.

To claim it, you must first be approved by the CRA through an application supported by a qualified medical practitioner (a doctor, nurse practitioner, psychologist, audiologist, or other designated professional, depending on the impairment). Approval is not automatic. The CRA assesses whether your impairment meets specific criteria around severity and duration.

The Base Federal Credit Amount 💡

For the 2024 tax year, the base federal DTC amount is $9,428. Because this is a 15% non-refundable credit (matching the lowest federal tax bracket), the maximum federal tax reduction works out to approximately $1,414.

That figure adjusts annually with inflation, so the number for future tax years will differ.

The supplement for children under 18 can significantly increase the total credit for families. However, that supplement is reduced if substantial amounts were paid for child care or attendant care — a detail that catches many families off guard.

Provincial Credits Add Another Layer

Each province and territory has its own tax system, and most offer a parallel provincial disability amount. The provincial credit rate and base amount vary by jurisdiction, so the combined federal-plus-provincial value of the DTC is higher than the federal figure alone.

For example, Ontario applies a provincial credit at roughly 5.05% of its own disability base amount. Quebec calculates things differently altogether. The practical result: your total DTC value depends on where you live, and comparing only the federal number gives an incomplete picture.

Transferring the Credit to a Supporting Person

One of the most important and underused features of the DTC: if the person with the disability doesn't need the full credit (because they have little or no taxable income), they can transfer the unused portion to a supporting family member.

Eligible supporting individuals include a spouse or common-law partner, parent, grandparent, child, grandchild, sibling, aunt, uncle, niece, or nephew — provided they supported the person with the disability during the year.

This transfer can make the DTC valuable even when the person with the disability has no tax owing themselves. The amount transferable is whatever remains after reducing the disabled person's own tax to zero.

Retroactive Claims: Up to 10 Years Back 📋

If someone was eligible for the DTC in prior years but never applied, the CRA allows retroactive claims going back up to 10 years. This can result in a meaningful lump-sum refund or credit adjustment — but only if the person had taxable income in those years against which the credit could apply, or if a supporting person did.

The retroactive value varies considerably depending on income history, applicable tax rates for each year, and whether the credit could be transferred. There's no guaranteed refund amount without running the actual numbers for each year.

Factors That Shape What You Actually Receive

The gap between the theoretical credit value and what you practically receive comes down to several variables:

• Your federal and provincial tax owing — a non-refundable credit only offsets tax owed
• Your age — the under-18 supplement increases the total for eligible children
• Whether you have a supporting family member — determines if and how much can be transferred
• Province of residence — affects provincial credit rate and base amount
• Child care or attendant care expenses — can reduce the under-18 supplement
• Years of eligibility — especially relevant for retroactive claims
• Whether you're approved at all — the CRA's medical adjudication is its own separate threshold

Two individuals with similar disabilities living in different provinces, at different income levels, and with different family situations can see total DTC value ranging from a few hundred dollars to well over two thousand dollars per year.

The Approval Process Is Separate from the Tax Calculation

It's worth keeping these two things distinct. Getting CRA approval for the DTC (the T2201 form, completed by a medical practitioner) is a medical adjudication process. Getting the financial benefit from the credit is a tax calculation process. Many people focus on one and miss details in the other.

Even after approval, if you don't file taxes or owe no tax and have no eligible supporting person, the credit may yield nothing in the current year — though it may still be worth applying, because circumstances change.

Your specific medical history, tax situation, family structure, and province of residence are the factors that determine what the Disability Tax Credit is actually worth to you — and those aren't variables anyone outside your own circumstances can plug in for you.