Common Canadian Tax Deductions People Miss Every Year

Tax season arrives the same time each year. So does the sinking feeling that you probably missed something.

You didn't forget to file. You remembered the deadline. But there's a specific kind of money left on the table that doesn't announce itself — tax deductions Canada's filing system doesn't remind you to claim.

This is the complete Canadian tax deductions list for individual filers: what qualifies, what you actually need to claim it, and where the eligibility rules are most commonly misread.

Seven deductions below. Some are straightforward. Some require forms your employer needs to sign. All of them are worth working through before you hit submit.

1. Home Office Expenses

If you worked from home in 2025 — whether your employer required it or you run your own business — you can deduct a proportional share of your home expenses. Most people know this in theory. Fewer actually claim it correctly.

Employees

You need a completed T2200 (Declaration of Conditions of Employment) from your employer confirming the home-work arrangement. With that form, you can claim:

• Electricity, heating, and water
• Internet and phone — business-use portion only
• Rent or mortgage interest, proportional to workspace size
• Property taxes, home insurance, and maintenance

The calculation is based on the percentage of your home used for work. A dedicated office in a 900 sq ft apartment produces a different number than a corner of a shared living room — and CRA does care about the distinction.

Self-Employed Filers

Self-employed filers use Form T2125 (Statement of Business or Professional Activities), which covers a broader range of expenses — including vehicle costs — when the workspace is your principal place of business. If you're contracting, freelancing, or running any gig income through your home, T2125 typically yields more than the employee route.

2. RRSP Contributions

The contribution deadline for the 2025 tax year was March 2, 2026. If you put money in before that date, those contributions reduce your 2025 taxable income dollar-for-dollar.

Your limit is 18% of your previous year's earned income, up to CRA's annual maximum, minus any pension adjustment. The exact figure is on your Notice of Assessment — not something you need to calculate, but something you do need to check.

Two Things People Miss Consistently

Contributing but not claiming. If you made an RRSP contribution in early 2026 to apply toward your 2025 return, it does not attach itself automatically. You report it on Line 20800. Skip this step and that deduction sits unused.

Leaving carry-forward room on the table. Unused RRSP room accumulates indefinitely. If you under-contributed in previous years — which most people have — that room is still available. Log into CRA My Account or check your last Notice of Assessment to see what you're working with.

3. Medical Expenses

Under-claimed, year after year. Partly because people assume the threshold makes it not worth pursuing. Partly because the list of eligible expenses is much broader than most people expect.

You can claim medical expenses that exceed either 3% of your net income or $2,635 for the 2025 tax year (verify the current threshold at canada.ca before filing), whichever is lower. Once you clear that floor, the credit applies to everything above it.

What Qualifies Beyond Prescriptions

• Dental and vision care — glasses, contacts, laser eye surgery
• Mental health services: psychologists, registered counsellors, therapists
• Fertility treatments and surrogacy expenses
• Medical devices: hearing aids, wheelchairs, blood pressure monitors
• Premiums paid to a private health insurance plan
• Travel to receive medical treatment, if the nearest facility is more than 40 km away

You can claim for yourself, your spouse, and your dependents. If your household had a heavier-than-usual medical year, add everything up before deciding the threshold makes it not worth pursuing.

Newcomer note: If you arrived in Canada part-way through 2025, your income threshold is lower because your Canadian income was partial-year. That means the 3% floor is lower — and the credit becomes accessible sooner. Medical costs you paid after your arrival date are eligible. Costs paid before establishing Canadian residency are not.

4. Child Care Expenses

For working parents, this is often the largest deduction they're not fully using.

You can deduct child care costs paid to let you — or your spouse or common-law partner — earn employment income, run a business, or attend school. The lower-income spouse must claim the deduction in most cases.

2024 Tax Year Maximums (Confirm 2025 Figures at canada.ca)

• Up to $8,000 per child under age 7
• Up to $5,000 per child aged 7 to 16
• Higher limits apply for children with disabilities

There is no single total cap. The claimable amount scales with the number and ages of your children.

Claim using Form T778. Keep every receipt. CRA requests them.

5. Moving Expenses

If you relocated in 2025 to start a new job, run a business in a new city, or attend post-secondary school full-time, the costs of that move may be deductible.

The rule: your new home must be at least 40 kilometres closer (by the shortest usual public route) to your new workplace or school than your previous address was.

Your claim is limited to income earned at the new location. If you only worked there for part of the year, that caps your deduction. Complete Form T1-M and report on Line 21900.

6. Professional Dues, Union Dues, and Employment Expenses

These tend to get paid automatically and forgotten. If you belong to a professional association or union, annual dues are deductible. This applies to CPAs, engineers, physicians, lawyers, and any regulated profession with annual licensing requirements.

Employment-related expenses — vehicle use, tools, certain travel — are deductible via Form T777, but only if your employer has provided a completed T2200. Without it, the claim does not stand.

The individual amounts here are often modest. They add up. If you've been paying professional dues for years and not claiming them, that's a straightforward fix on Line 21200.

7. Investment Carrying Charges and Interest Expenses

Most individual filers skip this one entirely. That's understandable — it only applies to non-registered investment accounts, which rules out anything held inside an RRSP, TFSA, or other registered plan.

But two groups of filers hit this more often than they'd expect:

Gig workers and self-employed filers whose income varies enough that they've been setting money aside in taxable brokerage accounts alongside — or instead of — maxing registered plans. Variable income makes RRSP timing complicated, and a non-registered account often fills that gap.

Newcomers to Canada who arrived with foreign investment assets or opened a Canadian taxable account before navigating the registered-plan system. That's a common sequence, and it leaves deductible carrying charges sitting unclaimed.

What Qualifies on Line 22100

• Interest paid on money borrowed to earn investment income (a margin account, for example)
• Investment counsel and management fees — non-registered accounts only
• Accounting fees specifically related to reporting investment income
• Safe deposit box fees, if the box holds investment documents

Registered accounts produce no deduction here. Non-registered accounts do. The account type is the first question to answer.

Why These Canadian Tax Deductions Get Missed

The CRA won't prompt you. The forms are published; the rules are on canada.ca; but connecting your actual circumstances to the right line items takes time or knowledge most people don't have at filing time.

The receipts that qualify often don't look like tax documents. The forms that unlock the largest claims — T2200, T778, T2125 — aren't part of standard software prompts. And the rules shift often enough that what applied in 2022 may not apply for your 2025 return.

How Count My Account Reviews Your Deductions

This is a structured part of every file we process — not something we check if there's time.

• You complete a short intake form based on your filing profile (employee, self-employed, newcomer, investor)
• We assign a tax specialist who handles your specific case type regularly
• Your specialist reviews your return against the full deduction list — including the ones on this page
• You see the draft, ask questions, and approve before anything is filed
• We file electronically with CRA

Timeline: 5-7 business days for most personal returns.

Pricing is confirmed upfront. No surprises after the fact. Year-round access to your specialist — not just in April.

Frequently Asked Questions

What tax deductions do most Canadians miss?

The most commonly overlooked deductions are home office expenses (particularly for employees who don't know they need a T2200), medical expenses (people underestimate the eligible list), RRSP carry-forward room, and professional or union dues paid annually but never claimed. Investment carrying charges on non-registered accounts are missed almost universally by individual filers.

Can I claim home office expenses without a T2200?

Employees cannot claim home office expenses without a completed T2200 from their employer. Self-employed filers do not need a T2200 — they use Form T2125 instead. The T2200 requirement applies only to T4 employees.

What medical expenses are tax deductible in Canada?

The CRA's list is longer than most people expect. Prescription medications, dental work, vision care (including laser eye surgery), mental health services (psychologists, registered counsellors, therapists), medical devices, fertility treatments, private health insurance premiums, and travel to medical treatment more than 40 km away all qualify. You claim them on Lines 33099 and 33199.

How do I know my RRSP contribution limit?

Your RRSP deduction limit is printed on your Notice of Assessment from the previous year. It's also visible in CRA My Account. The limit is 18% of your previous year's earned income up to the CRA annual maximum, minus any pension adjustment. Unused room carries forward indefinitely from prior years.

Can newcomers to Canada claim tax deductions in their first year?

Yes. Newcomers to Canada are eligible for most standard deductions from the date they establish Canadian residency. Your income threshold for medical expenses is calculated on partial-year income, which typically makes the credit more accessible in year one. RRSP contribution room starts accumulating based on Canadian earned income. A specialist familiar with newcomer filings will ensure residency dates are applied correctly across all deductions.

Can I claim child care expenses if my child attends a private school?

Tuition fees for private schools are not child care expenses for CRA purposes. However, if the school provides before- or after-school care as a separate program, those fees may qualify. Keep the receipts separated by service type. The school should be able to provide documentation that distinguishes care fees from tuition.

What is the difference between a tax deduction and a tax credit in Canada?

A tax deduction reduces your taxable income. A tax credit reduces your tax payable directly. RRSP contributions, moving expenses, and home office expenses are deductions. Medical expenses and the disability tax credit are credits. The financial impact of each depends on your marginal tax rate and the type of credit (refundable vs. non-refundable).