Self-employed professionals and sole proprietors — consultants, contractors, tradespeople operating as individuals, and professionals with unincorporated practices — can claim home office and vehicle expenses against their business income. Done correctly, these deductions can be substantial. Done carelessly, they can trigger a CRA review.
Here is how the rules actually work, and what documentation you need to support your claims.
The key distinction: these rules apply to self-employed individuals and sole proprietors filing a T2125 (Statement of Business or Professional Activities). Employees claiming home office expenses follow different, more restrictive rules requiring a T2200 form from their employer — covered separately.
Home Office Expenses for the Self-Employed
If you use part of your home for business — either as your principal place of business or to meet clients regularly — you can deduct a proportional share of home expenses based on the size of your workspace relative to your home.
Eligible Expenses
- Utilities (electricity, heat, water)
- Home insurance
- Property taxes
- Mortgage interest (not principal)
- Maintenance and repairs (proportional for general repairs; full amount for repairs specific to the workspace)
- Internet and phone (business-use portion)
- Rent, if you rent your home
Calculating the Business-Use Percentage
The standard method is square footage: divide the square footage of your workspace by the total finished square footage of your home. If your home office is 150 square feet and your home is 1,800 square feet, your business-use percentage is approximately 8.3%.
If the space is used for both business and personal purposes (a spare bedroom that doubles as an office), CRA expects you to further prorate based on the hours used for business versus personal use.
The Carry-Forward Rule
Home office expenses cannot create or increase a business loss. If your business-use percentage of expenses exceeds your business income for the year, the excess is not lost — it can be carried forward and deducted against business income in future years.
Vehicle Expenses for the Self-Employed
If you use your personal vehicle for business purposes — visiting clients, attending job sites, picking up supplies — you can deduct the business-use portion of vehicle expenses.
Eligible Expenses
- Fuel
- Insurance
- Maintenance and repairs
- Licence and registration fees
- Lease payments (subject to limits) or capital cost allowance (depreciation) if owned
- Loan interest (subject to limits) if financed
- Parking for business purposes (100% deductible, separate from the business-use percentage)
The Mileage Log — Non-Negotiable
The single most important piece of documentation for vehicle expenses is a mileage log. CRA requires you to track:
- Total kilometres driven during the year (business + personal)
- Kilometres driven for business purposes
- For each business trip: date, destination, purpose, and kilometres
Your business-use percentage is business kilometres divided by total kilometres. This percentage is then applied to all vehicle expenses (except parking, which is claimed separately).
Commuting from home to a regular place of business is considered personal use — not business use — even if you are self-employed. This catches many people off guard. If you have a fixed office or job site you travel to regularly, that drive does not count as business kilometres. Driving from your home office to a client’s location, or between job sites, does count.
A Practical Example
| Item | Amount |
|---|---|
| Total kilometres driven in the year | 22,000 km |
| Business kilometres (per log) | 14,000 km |
| Business-use percentage | 63.6% |
| Total vehicle expenses (fuel, insurance, maintenance, CCA) | $9,200 |
| Deductible vehicle expense | $5,851 (63.6% × $9,200) |
| Plus: business parking (100% deductible) | $340 |
| Total vehicle deduction | $6,191 |
Capital Cost Allowance (CCA) on Vehicles
If you own your vehicle (rather than lease), you can claim CCA — the tax term for depreciation — on the business-use portion of the vehicle’s cost. Passenger vehicles have a capital cost limit (a maximum cost on which CCA can be claimed, set annually by CRA), which is important if you drive a higher-end vehicle.
CCA is optional — you do not have to claim the maximum each year, and claiming less in early years can be advantageous if you expect higher business income (and a higher marginal tax rate) in later years.
Common Mistakes to Avoid
- No mileage log. Without a log, CRA can disallow the entire vehicle expense claim — not just reduce it. A simple notebook, app, or spreadsheet updated regularly is sufficient; the absence of any record is the problem.
- Claiming 100% business use. Almost no self-employed individual uses their vehicle 100% for business — even occasional personal errands count against the percentage. Claims of 95–100% business use are a common audit trigger.
- Treating commuting as business travel. As noted, regular commuting to a fixed place of business is personal use, regardless of self-employed status.
- Creating a loss through home office expenses. Remember the carry-forward rule — home office expenses cannot exceed business income for the year.
- Mixing receipts without records. Keep a dedicated folder (digital or physical) for home office and vehicle-related receipts, and reconcile them against your calculations at year-end.
The Bottom Line
Home office and vehicle expenses are legitimate, valuable deductions for self-employed professionals — but they require ongoing record-keeping, not a year-end estimate. The few minutes it takes to log a trip or file a receipt as it happens pays off significantly at tax time, both in the size of your deduction and in your ability to defend it if CRA asks questions.
The Self-Employed Tax Deductions Checklist
Home office deductions, vehicle expenses, income splitting, and other ways sole proprietors and small business owners can legally reduce their tax bill.
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