Every spring, thousands of Canadian households pay more tax than they need to, simply because they never claimed expenses they were entitled to. Medical and disability tax credits in Canada are among the most commonly missed, partly because the eligible list is broader than most people assume and partly because the rules reward a bit of planning. If you support a spouse, a child, or an aging parent, the receipts sitting in your kitchen drawer may be worth real money at tax time.
How medical and disability tax credits in Canada actually work
Both of these are non-refundable tax credits, which means they reduce the tax you owe rather than paying you cash directly. For 2026, the federal credit is calculated at the lowest federal rate of 14 per cent, and your province adds its own credit on top of the same eligible amount. So a claim is genuinely worth more than one in ten dollars back at the combined federal and provincial level — not a full refund of what you spent, but a meaningful offset against tax.
The medical expense tax credit works on a threshold. You can only count the portion of your eligible expenses that exceeds the lesser of three per cent of your net income or an annually indexed dollar ceiling. In practice, that means a lower-income spouse is often the smarter person to make the claim, because three per cent of a smaller income is a smaller hurdle to clear. This single choice is one of the most overlooked planning moves families miss.
The eligible expenses people forget
The Canada Revenue Agency’s list of eligible medical expenses is long, and it goes well beyond doctor and hospital bills. Costs that regularly go unclaimed include:
- Prescription eyeglasses, contact lenses, and hearing aids with their batteries.
- Dental treatment, orthodontics, dentures, and implants.
- Physiotherapy, psychology, speech therapy, chiropractic, and other treatment from an authorized practitioner.
- Premiums you pay to a private health services plan or a travel medical insurance policy.
- Prescribed medications and many medical devices, from blood-glucose monitors to walkers.
- Reasonable travel costs — including mileage, meals, and accommodation — when you must travel to get care not available closer to home.
A common trap is the private health plan premium. If you pay for extended health or dental coverage — whether through a group plan at work where you cover the cost, or a policy you buy yourself — those premiums usually qualify. So does coverage bought for travel. People pay these amounts month after month and never think to add them up.
Pick your own 12-month window
You do not have to use a calendar year for the medical expense claim. You can choose any 12-month period ending in the tax year, then use the same window for everyone in the family. If a big dental bill landed in November and another in the following February, choosing a window that captures both can lift you over the three per cent threshold and turn two small claims into one worthwhile one.
The Disability Tax Credit is the big one
The Disability Tax Credit (DTC) is separate from, and far more valuable than, the medical expense credit — and it is badly under-claimed. It is meant for people with a severe and prolonged impairment in physical or mental functions, certified by a medical practitioner on Form T2201. The impairment does not have to involve a wheelchair; conditions affecting hearing, walking, feeding, dressing, mental functions, or requiring life-sustaining therapy can all qualify.
For 2026 the federal disability amount is roughly ten thousand dollars, with an additional supplement for a person under 18. Applied at the 14 per cent federal rate and combined with the provincial credit, an approved claim is worth well over a thousand dollars a year in reduced tax. If the person with the disability has little or no taxable income, the credit can often be transferred to a supporting spouse or family member so it is not wasted.
The Disability Tax Credit is the one most families never think to ask about — and the one that most often pays for itself many times over.
Backdated claims and the doors it opens
When the CRA approves a T2201, the certification can apply retroactively to the years the impairment existed. That can mean adjustments to as many as ten prior tax returns and a lump-sum refund of tax already paid. Approval also unlocks other programs, including the Registered Disability Savings Plan and, for eligible working Canadians, the Canada Workers Benefit disability supplement. In other words, the DTC is often the gateway credit — getting approved is what makes the rest possible.
Caregivers and family members count too
If you support a dependent relative — a parent, grandparent, adult child, or sibling — you may be able to claim their eligible medical expenses on your own return, and you may qualify for the Canada Caregiver Credit as well. The caregiver credit recognizes the real cost of supporting someone with a physical or mental impairment, and it is frequently missed by adult children quietly helping aging parents. These claims interact, so it is worth mapping out who claims what before anyone files.
Keep the paper trail
None of this works without documentation. The CRA does not want receipts attached to your return, but it can ask for them later, and it does. Keep every receipt, prescription, and the T2201 confirmation for at least six years. For travel claims, note the date, distance, and reason for each trip. Good records are the difference between confidently claiming a credit and quietly giving it up because you are not sure you can back it up.
Key takeaways
- Medical and disability tax credits reduce tax owing at the 14 per cent federal rate for 2026, plus your provincial credit on the same amount.
- The medical expense credit only counts amounts above the lesser of three per cent of net income or an indexed ceiling — so the lower-income spouse usually claims.
- Private health and travel insurance premiums, glasses, dental, therapy, and travel for care are all commonly missed eligible expenses.
- You can choose any 12-month window ending in the tax year to capture more expenses.
- The Disability Tax Credit can be backdated up to ten years and unlocks other programs like the RDSP.
- Caregivers supporting a dependent relative may claim their expenses and the Canada Caregiver Credit.
If any of this sounds like your family, it is worth a proper review before you file — a single well-placed claim can more than cover the cost of getting advice. We can check your eligibility for the Disability Tax Credit, gather the right expenses, and make sure the claims land on the return where they do the most good. Book a consultation or learn more about our personal tax services, and let’s make sure you are not leaving money on the table.
This article is general information, not tax, legal, or financial advice. Rules and figures are current as of 2026 and can change. Please confirm your own situation with Lewis Partners.