Vehicle Expense Deductions in Canada: Logs, Limits and What the CRA Expects
The vehicle deduction is one of the most commonly claimed business expenses in Canada and one of the most commonly disallowed. The reason is almost never that the claim was illegitimate. It is that the taxpayer could not prove it.
The rule is simple to state and tedious to satisfy: you may deduct the business portion of your vehicle costs, and you must be able to demonstrate what that portion was. Everything else follows from that sentence.
The business-use ratio is the whole calculation
You do not deduct vehicle expenses directly. You calculate a ratio and apply it: Business kilometres ÷ total kilometres driven in the year = business-use percentage
That percentage is then applied to your total vehicle costs. Drive 8,000 business kilometres out of 20,000 total and 40% of your eligible costs are deductible.
Both numbers matter. People are diligent about recording business trips and casual about total kilometres, but understating the denominator inflates the ratio, and the odometer reading at each year end is the easiest thing in the world for the CRA to ask for.
What counts as a business kilometre, and what does not
This is where most claims quietly go wrong.
Commuting from home to your regular place of business is personal. It does not matter that you are going to work. It does not matter that you are self-employed. Home to office and office to home are personal kilometres.
Business travel between work locations counts. Office to client, client to client, office to supplier, and back again.
Travel from a home office to a client can count, provided the home office is genuinely your principal place of business. This is one of the most valuable interactions in the whole system: if your home office qualifies, trips from it become business kilometres rather than commuting. The conditions for that are set out in the home office deduction, and they are worth meeting deliberately.
Mixed trips are apportioned. Stopping at a client on the way to a personal errand does not make the whole journey deductible.
| Trip | Counts as business? |
|---|---|
| Home to your regular office | No. Commuting, even if self-employed |
| Office to a client and back | Yes |
| Client to client | Yes |
| Home office to a client | Yes, if the home office is your principal place of business |
| Office to a supplier | Yes |
| Client visit combined with a personal errand | Apportioned |
| Home to office on a Sunday | No. Still commuting |
The CRA’s summary of eligible costs is under motor vehicle expenses.
Which costs go into the pool
Apply your business-use percentage to:
- Fuel
- Maintenance and repairs
- Insurance
- Licence and registration
- Interest on a vehicle loan (subject to a monthly limit)
- Lease payments (subject to a monthly limit)
- Capital cost allowance, if you own the vehicle (subject to a cost ceiling)
Parking is different. Business parking is fully deductible as a direct expense rather than being apportioned: it is unambiguously business-related. Parking at your regular office is not.
Traffic and parking fines are never deductible, regardless of circumstance.
The interest, lease and capital cost limits are set by regulation and are adjusted periodically. Rather than working from a figure you read somewhere, check the current amounts against the CRA’s capital cost allowance classes for the year you are filing. These change, and using last year’s number is a small error that compounds across a vehicle’s life.
The logbook, which is the entire ballgame
The CRA’s motor vehicle records guidance asks for, per business trip:
- Date
- Destination
- Purpose
- Kilometres driven
Plus the odometer reading at the start and end of the fiscal period.
A full logbook for one year, then a sample thereafter. This is the provision most people do not know about and the one that saves the most effort. Maintain a complete logbook for one full base year, and in later years you may use a three-month sample to extrapolate: provided the sample is representative and business use has not changed substantially from the base year. The base year has to be genuine and complete for this to work.
Contemporaneous beats reconstructed, every time. A log built from calendar entries after receiving a CRA letter is recognisable as such and carries little weight. A log kept as you drive is close to unassailable. Use an app that records automatically if discipline is the obstacle: the method does not matter, the timing does.
This is precisely the pattern described in CRA audit triggers - the deduction is legitimate, the documentation decides the outcome.
Employees are on a different track
If you are an employee rather than self-employed, you cannot simply claim vehicle costs. You need a signed T2200 from your employer certifying that you were required to use your vehicle for work and were not fully reimbursed. Without that form, the claim does not proceed.
Employees also cannot claim capital cost allowance on the same basis as a business, and commuting remains personal no matter how far you travel.
Allowances and reimbursements
If your employer or your own corporation pays you a per-kilometre allowance at a reasonable rate, that allowance is generally not taxable to you, and you do not separately deduct vehicle costs. The CRA publishes prescribed rates each year under automobile and motor vehicle allowances.
For an incorporated owner-manager this is frequently the cleanest arrangement: the corporation reimburses you per business kilometre at the prescribed rate, deducts the payment, and no taxable benefit arises. It requires the same logbook, but it avoids putting a personal vehicle onto the corporate books, which brings standby charges and operating benefits into play and is usually more trouble than it is worth.
A flat monthly car allowance that is not based on kilometres is generally taxable in full. The distinction matters.
Should the corporation own the vehicle?
The instinctive answer is yes and it is often wrong.
When a corporation owns a vehicle available for your personal use, a standby charge and an operating expense benefit are added to your personal income. These are calculated on the vehicle’s cost or lease payments and on total personal-use kilometres, and for a vehicle with meaningful personal use, the resulting taxable benefit routinely exceeds the corporate deduction.
The per-kilometre reimbursement described above avoids all of it. Corporate ownership tends to make sense only where business use is very high and personal use is genuinely minimal.
The mistakes that cost real money
No log. The claim is reduced to whatever the CRA considers reasonable, which is normally far less than the truth.
Treating commuting as business travel. Common, understandable, and wrong.
Guessing the ratio. “About 70%” is not a calculation. Round numbers with no supporting records are a visible flag.
Ignoring the year-end odometer. Without it the denominator is unverifiable and the entire ratio is open to challenge.
Claiming 100% business use on your only vehicle. If you own one vehicle and claim it is used exclusively for business, the natural question is how you buy groceries. Some legitimate cases exist; they are rare and they need support.
Forgetting to include the vehicle in your accounting. Vehicle costs paid personally still belong in the business records if you are claiming them, see the monthly close.
Start today, not in April
The single highest-value action here takes two minutes: photograph your odometer now, and start a log. Whatever you have not recorded so far this year is largely unrecoverable, but the remainder of the year is still available to you, and a partial-year log with a clear start point is dramatically better than nothing.
If you drive meaningfully for work and have never claimed it properly, it is worth reviewing what you are leaving behind.
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