Home Office Deduction Self-Employed Canada 2025

How self-employed Canadians claim home office expenses on Form T2125 — eligibility rules, calculation methods, and eligible costs.

Who Qualifies for the Home Office Deduction

Self-employed Canadians can deduct home office expenses if the workspace is: (1) where you principally (more than 50% of the time) carry on your business, OR (2) used exclusively on a regular and continuous basis for meeting clients, customers, or patients. Meeting either condition qualifies you to claim the business-use portion of your home expenses.

Note: the "exclusively" requirement is strictly interpreted by the CRA. A room that doubles as a guest bedroom or family room does not qualify for the exclusive business use test, though it may still qualify under the "principally" test if you work there more than 50% of your business hours. A dedicated home office used only for work is the cleanest situation.

How to Calculate Your Home Office Deduction

The most common calculation method is based on the proportion of floor space used for business versus the total home floor space. Measure your dedicated workspace and divide by the total square footage of your home.

Example: Your home office is 120 sq ft. Your total home is 1,200 sq ft. Business use percentage = 120/1,200 = 10%. You can deduct 10% of eligible home expenses.

If your workspace is used partly for personal purposes (fails the exclusive use test but meets the principally test), you may further adjust the percentage to reflect actual business hours. For example, if you work from that space 8 hours a day, 5 days a week, and it is available for personal use in evenings and weekends, some accountants apply a time-use adjustment — though the CRA's published guidance focuses primarily on the space calculation.

Eligible Home Office Expenses

Expense	Renters	Homeowners
Rent	Yes (business %)	N/A
Mortgage interest	N/A	Yes (business %)
Property taxes	N/A	Yes (business %)
Home insurance	Yes (business %)	Yes (business %)
Utilities (heat, electricity, water)	Yes (business %)	Yes (business %)
Internet	Yes (business %)	Yes (business %)
Maintenance and repairs (home)	Yes (business %)	Yes (business %)
Cleaning supplies (home)	Yes (business %)	Yes (business %)
CCA on home structure	N/A	Caution: see PRE note below

The Principal Residence Exemption Warning for Homeowners

Homeowners should generally avoid claiming Capital Cost Allowance (CCA) on the portion of the home used for business. Claiming CCA designates that portion of the home as "non-residential," which can affect your Principal Residence Exemption when you sell — potentially triggering capital gains tax on that portion of the gain. Most tax advisors recommend homeowners claim all other eligible expenses (mortgage interest, property taxes, utilities, insurance) but skip CCA on the building structure. The tax savings from CCA are rarely worth the PRE risk.

Home Office Expense Limits

Home office expenses cannot be used to create or increase a business loss from self-employment. They can only reduce your net income from that business to zero. Any unused home office expenses are carried forward to the following year and applied against income from the same business. This carry-forward is indefinite — expenses that cannot be used in one year are not lost.

Record Keeping for Home Office Claims

Keep: floor plan or measurements of your workspace and total home, annual totals for all home expenses (save all utility bills, insurance renewals, mortgage statements showing interest paid, property tax bills), and photos of your dedicated workspace are helpful though not required. The CRA accepts digital records. Some homeowners have their workspace measured by a real estate agent or architect to have professional documentation if audited.