Home Office Expenses — Canada Tax Rules

Claim the proportional share of your home costs when your home is your principal place of business — using CRA's detailed method.

Claimable: Partially claimable · Tax authority: CRA (Canada Revenue Agency)

CRA (Canada Revenue Agency) Rules

• Your home must be your principal place of business, OR you must use the workspace exclusively and regularly for earning business income.
• Calculate your business-use percentage: divide the workspace area (sq ft) by the total home area (sq ft).
• Claimable costs include rent, mortgage interest (not principal repayment), property taxes, home insurance, utilities (heat, electricity, water), and internet.
• Multiply each annual household cost by your business-use percentage to find the deductible amount.
• If the workspace is also used personally (e.g. a living room table), apply a further time-use adjustment.
• Home office expenses cannot create or increase a business loss — unused amounts carry forward to the following year.
• Claim home office costs on Part 6 of Form T2125 (Statement of Business or Professional Activities).

Limits

No fixed dollar cap — must reflect genuine business-use proportion. Expenses cannot create a business loss; any excess carries forward.

Worked Example

Priya works from a dedicated 200 sq ft home office in a 1,000 sq ft apartment. Business-use: 200/1,000 = 20%. Annual costs: rent C$18,000, utilities C$2,400, internet C$720. Deductible: (C$18,000 + C$2,400 + C$720) × 20% = C$21,120 × 20% = C$4,224. Since the room is used exclusively for business, no time apportionment is needed.

Record Keeping

• Measure your workspace and total home floor area — document the calculation in writing each year
• Keep all utility bills, rent receipts or mortgage statements, property tax notices, and home insurance invoices
• If the workspace has mixed use, keep a log of hours used for business vs. personal activities
• Retain mortgage statements showing the interest component separately from principal repayment
• File your home office calculation alongside your T2125 in your own records

Frequently Asked Questions

Can I claim home office expenses if I also have an office at a client site?

Yes — you can claim home office expenses if your home is your principal place of business, even if you also work at client sites. CRA requires that the home is where the majority of your work is done, or that the home office is used exclusively to meet clients. Keep records showing the frequency of working from home vs. client sites.

Can I deduct my mortgage payments as a home office expense?

Only the interest component of your mortgage is deductible — not the principal repayment. Check your mortgage statement for the annual interest amount and apply your business-use percentage. If you own your home, you can also claim a proportional share of property taxes and home insurance.

What happens if my home office deduction exceeds my business income?

CRA does not allow home office expenses to create or increase a business loss. If your claim exceeds your business income, the unused portion carries forward and can be applied in a future year when you have sufficient business income.

Do I need a separate room to claim a home office in Canada?

A separate room is the strongest position — if it is exclusively used for business, you claim the full floor area proportion. A shared space (e.g. kitchen table) is harder to defend and requires a time-use estimate. CRA audits often challenge shared-space home office claims, so keep detailed records of your business-use hours.

Can I claim my internet costs as a home office expense in Canada?

Yes — the business-use portion of your internet bill is deductible. If you use the internet 70% for business and 30% personally, claim 70% of the annual cost. If you include internet as part of your home office calculation using the floor area method, apply the same proportion consistently.