Deducting Vehicle Expenses for Business Use in Ontario: The Self-Employed Person's Guide

If you drive for your business — visiting clients, attending sites, transporting equipment — a portion of your vehicle costs is a legitimate business expense deduction. Vehicle expenses for business use are one of the larger deductions available to Ontario self-employed people, but they are also one of the most closely scrutinized by the Canada Revenue Agency (CRA). Getting the deduction right means understanding what qualifies, keeping the right records, and knowing the special limits that apply to "passenger vehicles."

This article walks you through how the deduction works. As always, verify current dollar limits with the CRA or an accountant before filing.

The Core Rule: Business-Use Percentage

You are not permitted to deduct 100% of vehicle expenses simply because you own a business. You may only deduct the proportion of expenses attributable to business use, calculated as:

Business kilometres ÷ Total kilometres driven = Business-use percentage

Example (illustrative): You drive 24,000 km in a year. Of those, 14,400 km are for business travel. Your business-use percentage is 60%. You may deduct 60% of eligible vehicle expenses.

Personal trips — commuting from home to a regular fixed work location, grocery runs, personal errands — are not business kilometres. However, travelling from your home to a client's site is generally considered business travel if your home is your principal place of business (confirm this with your accountant for your specific situation).

The Mileage Log: Non-Negotiable

The CRA expects a contemporaneous mileage log — a record you keep as you drive, not one you reconstruct from memory at tax time. A proper log includes:

• Date of each business trip
• Starting point and destination
• Business purpose of the trip
• Kilometres driven

Smartphone apps that automatically log trips and flag business vs. personal are widely used and generally accepted. A notebook in the glovebox works too. What does not work: "I estimated I drove about 60% for business."

Keep your vehicle's odometer reading at January 1 and December 31 of each year.

What Vehicle Expenses Are Deductible?

For a vehicle you own, eligible expenses include:

• Fuel and oil
• Repairs and maintenance (tires, oil changes, brake pads)
• Insurance
• License and registration fees
• Loan interest (subject to a maximum — see below)
• Capital Cost Allowance (CCA) — the depreciation deduction on the vehicle's purchase cost (subject to a maximum cost ceiling — see below)
• Parking fees paid while on business trips (not monthly parking at your regular workplace)
• Leasing costs (if you lease — subject to a monthly maximum — see below)

Multiply each eligible expense by your business-use percentage to get the deductible amount.

Special Limits for Passenger Vehicles

The Income Tax Act draws a distinction between a "motor vehicle" (used in a business, such as a van, truck, or specialized vehicle) and a "passenger vehicle" (a car used partly for personal purposes). Most self-employed people drive a passenger vehicle.

For passenger vehicles, three categories of limits apply (as of writing — confirm current limits with the CRA before filing, as they are adjusted periodically):

1. CCA Cost Ceiling (Class 10.1)

If your passenger vehicle cost more than the prescribed ceiling, only that ceiling amount is included in the CCA calculation — you cannot depreciate the excess. The CRA sets and occasionally updates this ceiling.

2. Loan Interest Deduction Limit

The amount of interest you may deduct on money borrowed to purchase a passenger vehicle is capped at a prescribed monthly maximum. You may deduct the lesser of the actual interest or the cap, multiplied by your business-use percentage.

3. Leasing Cost Deduction Limit

Monthly lease payments for a passenger vehicle are subject to a prescribed monthly maximum before your business-use percentage is applied. If your lease payment exceeds the limit, the excess is not deductible.

These ceilings exist to prevent self-employed people from writing off luxury vehicles at full cost. An accountant will apply the correct limits in your T2125.

Owned Vehicle vs. Leased Vehicle: What Changes?

If you own your vehicle, the depreciation deduction is through CCA on Schedule 8/T2125. In the year you acquire the vehicle, the half-year rule typically reduces your first-year CCA.

If you lease, you replace CCA with the lease-cost deduction (subject to the monthly cap above). You still deduct the business proportion of insurance, fuel, and other operating costs.

There is no universal answer to whether owning or leasing is more tax-efficient — it depends on the vehicle's value, the lease terms, and your business-use percentage. An accountant can model both scenarios.

Two-Vehicle Situations

If you have two vehicles and use both partly for business, you track each separately. The CRA may look for consistency between years.

What You Cannot Deduct

• Kilometres between your home and a fixed regular workplace (commuting)
• Traffic and parking fines
• Car-wash costs (generally personal unless the vehicle is required to be clean for business image — this is a grey area)
• The personal-use portion of any expense

Frequently asked questions