How the Medical Expense Tax Credit Actually Works

What the credit actually does

The METC is a non-refundable federal tax credit, meaning it reduces the tax you owe but won't generate a cheque if you owe nothing. Most provinces also offer a parallel provincial medical credit, so you're often getting a combined federal-plus-provincial benefit on the same expenses.

The credit only kicks in on the portion of your eligible expenses above a threshold — a set percentage of your net income, capped at a specific dollar amount that's indexed each year. In practice this means small, scattered medical costs often don't clear the bar on their own, but a year with a big dental bill, orthodontics, or fertility treatment usually does.

Because the threshold is based on net income, it's almost always better for the lower-income spouse or partner to claim the family's combined medical expenses, even if the higher earner actually paid the bills. The CRA lets either spouse claim expenses paid for either person, and for a common-law or married couple, plus dependent children.

What counts as an eligible expense

The list of eligible medical expenses is long and specific, and the CRA maintains the definitive version — don't guess. Broadly, it covers costs not reimbursed by a provincial health plan or private insurance (and not expected to be reimbursed).

• Prescription drugs and medications your doctor or dentist prescribed - Dental work, including major procedures like crowns, implants, and orthodontics - Vision care: prescription glasses, contact lenses, and laser eye surgery - Paid premiums for private health and dental insurance plans - Travel costs to get medical care not available near home, in some cases - Certain home renovations or medical devices needed for a disability or mobility issue

Cosmetic procedures generally don't qualify unless they're medically necessary, and everyday items like vitamins or over-the-counter supplements usually don't qualify either. If insurance reimbursed part of a bill, only the amount you paid yourself is eligible.

Choosing your 12-month claim period

Unlike most tax slips that run on the calendar year, medical expenses can be claimed for any 12-month period ending in the tax year you're filing, as long as you haven't claimed those same expenses before. This flexibility is one of the most overlooked parts of the credit.

In practice, this lets you bundle expenses that straddle two calendar years — say, a big dental bill in November and orthodontic payments the following spring — into a single 12-month window that clears the income threshold more easily than splitting them across two separate tax years would.

Keep every receipt and insurance statement, ideally in one folder as the year goes on. The CRA can ask you to substantiate a medical claim, and reconstructing scattered pharmacy and dental receipts months later is a headache you can avoid.

How to make the claim

You report eligible medical expenses on your T1 personal income tax return, and the credit is calculated automatically by most tax software once you enter your total eligible expenses and net income. You don't send receipts with your return, but you must be able to produce them if the CRA reviews your claim.

If your net income is modest, ask about the refundable medical expense supplement — a separate, refundable credit aimed at lower-income working Canadians with medical expenses, layered on top of the regular METC. Eligibility rules and amounts change, so confirm current details with the CRA before filing.

A quick gut-check before you file: add up the household's eligible expenses for your best 12-month window, compare that total to the income-based threshold, and have whichever spouse has the lower net income make the claim if you're filing separately. That combination is what most often makes the difference between a token credit and a genuinely useful one.

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