Medical Expense Deductions in Canada vs. the U.S.: What Cross-Border Families Need to Know

Medical expenses can represent a significant financial burden, especially for families managing chronic conditions, aging parents, or unexpected health events. While both Canada and the United States offer tax relief for eligible medical expenses, the way those expenses are claimed, and how much tax benefit they generate, differs substantially between the two systems.

For individuals and families with cross-border ties, understanding these differences is essential for accurate tax planning and avoiding missed opportunities.

This article breaks down how medical expenses are treated on Canadian and U.S. tax returns and highlights key planning considerations for cross-border taxpayers.

How Medical Expenses Are Treated on Canadian Tax Returns

In Canada, eligible medical expenses do not create a deduction from income. Instead, they generate a non-refundable tax credit, which reduces taxes payable rather than taxable income.

Medical expenses are generally claimed on your personal return and may include costs incurred for yourself, your spouse or common-law partner, and eligible dependents. This is one of the tax items that can be shared between spouses since Canadian residents all file individual tax returns, no joint returns.

Step 1: Determine Eligible Medical Expenses

Eligible expenses can include items such as:

• Prescription medications
• Dental care
• Vision care
• Medical devices and equipment
• Certain therapy and treatment costs
• Travel expenses for medical care (in some cases)

Only qualifying out-of-pocket expenses that were not reimbursed can be claimed.

Step 2: Apply the Income Threshold

You must subtract the lesser of:

• 3% of your net income, or
• The annual medical expense threshold set for the tax year

This threshold limits the amount of medical expenses that can be used toward the credit.

Step 3: Calculate the Tax Credit

Once eligible expenses exceed the threshold, the remaining amount is multiplied by 15%, producing a federal non-refundable tax credit. Provincial credits may apply as well, depending on where you live.

Key takeaway:
In Canada, medical expenses reduce tax payable, not taxable income, and the benefit is capped by the credit rate.

How Medical Expenses Are Treated on U.S. Tax Returns

In the United States, medical expenses are treated very differently and can result in a direct income deduction, but only if certain conditions are met.

Medical expenses are claimed as an itemized deduction on Schedule A and are only beneficial if you do not use the standard deduction, although some states allow additional medical deductions.

Step 1: Identify Qualified Medical Expenses

Qualified unreimbursed medical expenses may include (not a conclusive list):

• Doctor and hospital bills
• Prescription drugs
• Dental and vision care
• Long-term care expenses
• Mileage associated with medical treatment
• Health insurance premiums in limited cases

Only unreimbursed expenses qualify.

Step 2: Apply the AGI Threshold

You may deduct medical expenses only to the extent they exceed 7.5% of your adjusted gross income (AGI).

For example, if your AGI is $100,000, only medical expenses above $7,500 are deductible.

Step 3: Reduce Taxable Income

Unlike Canada, qualifying medical expenses in the U.S. reduce taxable income directly, which can be especially valuable for taxpayers in higher marginal tax brackets.

Key takeaway:

In the U.S., medical expenses can reduce taxable income, but only after clearing a relatively high AGI threshold and only if itemizing makes sense.

Key Differences at a Glance

Cross-Border Planning Considerations

For individuals and families who live, work, or move between Canada and the U.S., these differences can materially affect tax outcomes.

Key considerations include:

• Timing medical procedures across tax years or jurisdictions
• Coordinating expenses between spouses with differing incomes
• Understanding how residency status impacts eligibility
• Avoiding duplicate or disallowed claims when filing in both countries

Medical expenses may look similar on the surface, but their tax treatment depends heavily on where you file and how your income is structured.

Medical expenses are one of the many tax areas where personal circumstances, income levels, and country-specific rules intersect in complex ways. What creates a meaningful deduction in the U.S. may produce only a modest credit in Canada, and vice versa.

For cross-border families, careful planning is essential to ensure medical costs are claimed correctly and efficiently on each side of the border.

If you have cross-border tax exposure, professional guidance can help align your healthcare decisions with your broader financial and tax strategy.