Home office tax deduction in Canada (2026)

Are you an employee or self-employed?

This is the most important question. The rules and deductible expenses are completely different:

• Employee — you get a T4 slip, your employer withholds CPP, EI, and income tax. You need a signed T2200 from your employer to claim anything.
• Self-employed — you run your own business, get paid without tax withheld, file a T2125 (Statement of Business Activities). You claim home office as "work-space-in-the-home expenses."
• Commission employee — a hybrid. You can claim more expenses than regular employees, including home internet, advertising, and some equipment.

Employee: claiming home office expenses

The two conditions

To claim as an employee, your home office must meet at least one of these:

1. It is where you principally perform your employment duties (more than 50% of your work time), OR
2. You use it exclusively to meet clients, customers, or other people in the course of your employment.

"Principally" means more than 50% of the time. If you split time 50/50 between home and an employer-provided office, you don't qualify. If you work 3 out of 5 days from home, you likely do.

What you need from your employer: T2200

Form T2200 (Declaration of Conditions of Employment) must be signed by your employer before you can claim. It confirms:

• You were required to work from home as a condition of employment
• You were not reimbursed for these expenses (or only partially)
• You were required to pay these costs yourself

You don't file the T2200 with your return, but CRA can request it during a review. Keep the original.

What employees can deduct

Employees (non-commission) can deduct:

• Heat, electricity, water (utilities)
• Rent (if renting; NOT mortgage principal or interest)
• Home internet access fees
• Maintenance and minor repairs to the workspace

Employees cannot deduct:

• Mortgage interest
• Property tax
• Home insurance
• Capital cost allowance (CCA) on the house
• Furniture or computers (those go on a separate Form T777 as employment expenses, if T2200 authorizes them)

Commission employees get a broader list: they can also claim home insurance, property taxes, and lease costs. But commission income creates its own complexity.

How to calculate the workspace percentage

You prorate based on the workspace area relative to the home. The most defensible method: square footage of the dedicated workspace ÷ total square footage of the home.

If the workspace is not used exclusively for work — you also use it as a guest room or for personal activities — CRA can further reduce the claim. Courts have accepted "regular and exclusive" use even when a room has a fold-out couch, but the cleaner the separation, the stronger your position.

The deduction can't create a loss

Employment expenses including home office cannot exceed your employment income from that job. You cannot use home office expenses to create or increase a loss from employment. Any unused amount carries forward to be claimed against income from the same employer in future years.

Self-employed: work-space-in-the-home expenses

Self-employed individuals claim home office on Form T2125 under "work-space-in-the-home expenses." The conditions are the same (principal place of business, or exclusive regular use for meeting clients), but the list of eligible expenses is much longer.

What self-employed workers can deduct

• Heat, electricity, water
• Rent (if renting)
• Internet
• Home insurance (business portion)
• Property tax (business portion)
• Maintenance and repairs to the workspace
• Mortgage interest (the business portion — CRA cannot count principal)
• Capital cost allowance (CCA) on the house — but this is usually a bad idea (see below)

Should you claim CCA on your home?

Claiming CCA on a home you also live in is almost always a mistake. It partially disqualifies your principal residence exemption for capital gains purposes. When you eventually sell the house, the CCA-claimed portion becomes taxable — a "terminal loss" or recaptured CCA — even if you never actually received a tax benefit that large. Most CPAs advise against it.

The carry-forward rule

Business use-of-home expenses also cannot exceed your business income from that location. They cannot create or increase a business loss. Any excess carries forward indefinitely, deductible in any future year you have enough business income.

What CRA looks for in an audit

Home office claims are a common audit trigger. CRA's auditors typically want:

• Floor plan or measurements confirming the workspace area
• Receipts for all claimed expenses (utility bills, rent payments, property tax statements)
• For employees: original signed T2200
• Evidence of exclusive use — photos of the dedicated workspace, calendar logs showing work activity
• A calculation showing how you arrived at the percentage

Keep these records for 6 years from the date of your assessment.

Example: comparing employee vs. self-employed deductions

Common mistakes

• No T2200 — employees who claim home office without getting T2200 from their employer. CRA will disallow the entire claim.
• Claiming too much — using the whole floor (dining room, living room) as "business use." Only the dedicated workspace counts.
• Claiming mortgage principal — CRA allows interest, never principal. Many first-time filers confuse this.
• Non-exclusive use — a desk in the corner of a bedroom that doubles as your personal study probably qualifies, but a dining table that becomes a desk sometimes does not.
• Claiming renovation costs — adding a deck or renovating a kitchen is not a workspace expense. Only the workspace area's maintenance qualifies, and only to the business percentage.