Two questions come up constantly for self-employed Canadians: can I deduct home office expenses, and can I claim business-use vehicle expenses? In many cases, yes, but only if the CRA conditions are actually met and the allocation is properly supported. Both deductions require careful support because they involve mixed personal and business use.
This guide covers the actual rules for both deductions: who qualifies, what expenses you can claim, how to calculate the business portion, and what documentation CRA expects to see. Both deductions are reported on Form T2125, Statement of Business or Professional Activities.
Key CRA and Related References
Form T2125 | Business-use-of-home expenses (CRA) | Motor vehicle expenses (CRA) | Guide T4002 | Capital cost allowance (CRA)
Home Office Expenses
Who Qualifies
CRA allows self-employed Canadians to deduct home office expenses if they meet one of two conditions:
- The home is your principal place of business, meaning you do most of your work there rather than at a client site or separate office.
- You use a dedicated space in your home exclusively for business purposes, and you use it on a regular and ongoing basis to meet clients, customers, or patients.
The second condition is narrower than it sounds. CRA expects the workspace to be used regularly and ongoing to meet clients, customers, or patients. Many self-employed professionals who work remotely and do not receive clients at their home workspace do not satisfy this test. In those cases, the principal place of business condition is the more relevant one. See the CRA page on business-use-of-home expenses for the full CRA position.
What Expenses Are Deductible
For self-employed Canadians, deductible home office expenses include: rent (for renters), mortgage interest (the interest portion only, not principal repayment), property taxes, home insurance, utilities (heat, electricity, water), cleaning and maintenance costs related to the workspace, and internet where a reasonable business allocation can be supported.
Capital cost allowance (CCA) on the business-use portion of your home requires careful consideration. If you deduct CCA on the business-use part of your home, capital gain and recapture rules can apply when you later sell the property. This is a decision to make with a CPA before filing, not a standard line item to include automatically.
Expenses that are not deductible include mortgage principal, home renovations unrelated to the workspace, and costs that are purely personal in nature.
How to Calculate the Business Portion
The calculation method must be reasonable. CRA accepts square footage as the standard approach. Divide the square footage of the dedicated workspace by the total square footage of the home. If your home is 1,200 square feet and your dedicated office is 150 square feet, the business-use percentage is 12.5%. Apply that percentage to each eligible home expense.
If you use a room for both personal and business purposes (a spare bedroom that doubles as an office, for example), you must also factor in the hours of business use. Calculate the hours per day the room is used for business, divide by 24, then multiply by the room’s share of total home area. The CRA page on business-use-of-home expenses walks through this in detail.
The Loss Restriction Rule
Home office expenses cannot be used to create or increase a business loss. If your business income is CAD $8,000 and your eligible home office expenses for the year are CAD $10,000, you can only claim CAD $8,000. The remaining CAD $2,000 carries forward to the following year and can be applied against income from the same business.
This carry-forward applies to the same business only. If you close one practice and open another, the carried-forward amount cannot be applied to the new business. This can catch self-employed professionals off guard when the business changes or is discontinued.
Documentation CRA Expects
Keep all receipts for every home expense you are allocating. A floor plan or sketch that establishes the square footage of the workspace is useful supporting documentation. For mixed-use spaces, a usage log showing the hours the room is used for business strengthens the claim.
Vehicle Expenses
Who Can Claim
If you use a vehicle to earn business income (driving to client sites, job sites, suppliers, or other business meetings), you can deduct the business portion of the operating costs. The key rule: you must use the vehicle for earning income. Commuting from home to a fixed office location does not qualify as business travel.
All vehicle expense deductions for self-employed Canadians are reported on page 8 of Form T2125, which separates motor vehicle expenses from capital cost allowance.
What Expenses Are Deductible
The business portion of the following vehicle costs is deductible: fuel and oil, insurance (the business-use percentage of annual premiums), repairs and maintenance, licence and registration fees, lease payments (subject to CRA’s monthly deduction limit of CAD $1,100/month for leases entered into on or after January 1, 2025, plus applicable taxes), and interest on a vehicle loan (subject to CRA limits; for new automobile loans entered into on or after January 1, 2025, the maximum deductible interest is CAD $350 per month).
Capital cost allowance (CCA) on the vehicle, calculated using CRA’s prescribed rates by vehicle class, is also deductible on the business-use portion. Parking fees and supplementary business insurance for the vehicle can be claimed at 100% without the business-use percentage applied. See the CRA page on motor vehicle expenses for the full list and current limits.
Passenger Vehicles vs. Motor Vehicles
CRA distinguishes between passenger vehicles (cars, SUVs, and most personal vehicles) and motor vehicles (vans, pickups, and other vehicles used primarily to transport goods or equipment). Passenger vehicles are subject to cost caps that limit how much CCA you can claim in a year. Vehicle classification affects the deduction limits and CCA treatment. Pickups and vans can fall under different rules depending on design and level of business use, so the correct CRA class should be confirmed before claiming CCA.
The classifications are detailed in Guide T4002, Self-employed Business, Professional, Commission, Farming, and Fishing Income.
The Logbook Requirement
This is where vehicle claims most often fail a CRA review: no logbook, or an incomplete one. CRA requires a logbook that records, for each business trip: the date of the trip, the destination, the business purpose, and the distance driven in kilometres. You must also record the odometer reading at the start and end of each fiscal year. The total kilometres driven and the business kilometres driven establish the business-use percentage, which applies to all vehicle expenses.
See the CRA page on motor vehicle expenses for the exact logbook requirements.
The Simplified Logbook Option
After maintaining a full 12-month logbook in a base year, CRA permits a three-month sample logbook in subsequent years, provided the business-use percentage in the sample period is within 10% of the corresponding period in the base year. If usage patterns change significantly year over year, a new 12-month base year is required.
This option reduces the ongoing burden of daily tracking for professionals whose driving patterns are relatively consistent.
What Does Not Count as Business Use
Travel between home and a regular place of business is personal, not deductible. Fact patterns involving multiple work locations should be reviewed carefully, as treatment depends on the specifics of each situation.
Where These Deductions Often Go Wrong
Common problem areas on self-employed returns involving home office and vehicle expenses include the following.
- Claiming mortgage principal: Only the interest portion of a mortgage payment is deductible. The principal repayment is not an expense; it is an asset acquisition.
- No logbook for vehicle claims: A reconstructed estimate of business use after the fact is weak support and may not hold up on review. The strongest support is a contemporaneous logbook maintained throughout the year.
- Claiming 100% of a vehicle used personally: If you also use the vehicle for personal driving, only the business portion is deductible. A claim of 95% or more for a single personal vehicle almost always invites scrutiny.
- Applying home office expenses across business types: Carry-forward amounts apply only to the specific business that generated them, not to other business activities.
- Claiming CCA on a home without understanding the implications: If you deduct CCA on the business-use part of your home, capital gain and recapture rules can apply when you sell the property. This is a decision to make with a CPA before filing.
When to Involve a CPA
Both deductions have enough complexity that the calculation method and documentation approach matter. A mortgage agent with a home office and a vehicle used for client meetings is dealing with two mixed-use allocations simultaneously, and the numbers on both need to hold up if CRA asks.
At Teplov CPA, we work with self-employed Canadians in IT contracting, mortgage brokerage, insurance, trades, real estate, and real estate investing. If you are unsure whether your current approach to either deduction is defensible, we can review it as part of your 2025 tax return preparation and current-year bookkeeping setup.
Contact us at contact@teplov.ca or visit teplov.ca to get started.