How to Claim a Home Office in Canada

To claim home office expenses in Canada as a sole proprietor, you must use part of your home exclusively for business and report the claim on Form T2125, Statement of Business Activities. The Canada Revenue Agency (CRA) allows two main approaches: the detailed method and, when available, the simplified flat-rate method. This guide explains who qualifies, what expenses count, and how to calculate your deduction for the current tax year.

Who can claim a home office in Canada?

You can claim a home office if you meet one of two CRA tests: your home office is your principal place of business, or you use it exclusively to earn business income and meet clients or customers there on a regular and continuous basis. For sole proprietors, the claim is made on Form T2125. If you use a space that serves other purposes, such as a kitchen table or a guest bedroom, you generally cannot claim it. Exclusivity is strict. For a broader list of write-offs, see sole proprietorship tax deductions.

Simplified vs detailed home office claim methods

The CRA has offered a simplified home office claim (flat-rate method) in certain past years. Under that method, you could claim a set daily amount without tracking individual receipts. The CRA may or may not offer it; confirm current availability on the CRA website. The detailed method is always available and requires you to calculate actual expenses and prorate them by business use. The table below compares the two.

Feature	Simplified (flat-rate) method	Detailed method
Calculation	A set daily amount (check CRA for current rate)	Actual expenses × business-use percentage
Records	Minimal; track days worked from home	Keep all receipts, bills, and a floor plan
Expenses covered	Broad, but capped by flat amount	All eligible home expenses
Best for	Simple situations, few receipts	Higher expenses, dedicated home office

How to calculate your home office claim

Under the detailed method, you need a reasonable business-use percentage. The CRA accepts two common approaches: (1) area of your home used for business divided by total finished area, or (2) number of rooms used for business divided by total rooms, if the rooms are similar in size. For example, if your office is 100 square feet and your home is 1,000 square feet, your business-use percentage is 10%. You then multiply each eligible expense by that percentage. Keep a floor plan and calculations. For a full breakdown, see home office expense deduction in Canada.

Eligible home office expenses for sole proprietors

You can generally claim the business portion of the following, if they relate to your home office:

• Rent
• Utilities (heat, electricity, water)
• Home internet (business portion)
• Home insurance
• Property taxes
• Mortgage interest (not principal)
• Maintenance and minor repairs
• Capital cost allowance (CCA) on the home – but get tax advice first, as claiming CCA can affect your principal residence exemption

You cannot claim mortgage principal, furniture, or personal expenses. If you are registered for GST/HST, you may also be able to claim input tax credits (ITCs) on the business portion. See input tax credits in Canada. Vehicle expenses are separate; see vehicle expense deduction.

How to report your home office claim on Form T2125

Complete the business-use-of-home section of Form T2125. Enter your business-use percentage and the eligible expenses. The CRA then calculates your allowable deduction, limited to your net business income before the home office claim. You cannot create or increase a business loss with home office expenses. Attach Form T2125 to your T1 return. For filing steps, see how to file taxes as a sole proprietor.

Record-keeping and CRA review

Keep all supporting documents for at least six years from the end of the tax year. This includes receipts, utility bills, lease agreements, mortgage statements, and a floor plan showing the business-use area. The CRA may ask for these during a review. If you use the simplified method, keep a record of the days you worked from home. As of the current tax year, confirm current record-keeping rules on the CRA website.

Common mistakes to avoid

Do not claim a space that is not used exclusively for business. Do not deduct mortgage principal. Do not claim 100% of a home expense unless the space is used 100% for business. Do not forget to add back any personal-use portion. If you claim CCA on your home, understand the potential impact on the principal residence exemption. Finally, report the claim on the correct form and keep your calculations consistent year to year.