It's one of the most common questions an incorporated owner asks: should I buy my next car through the company? The pitch is appealing — the corporation pays for the vehicle, the fuel, the insurance, and deducts it all. What's left out is the other side of the ledger.

When your corporation provides you with a vehicle that you also use personally, the Income Tax Act says you've received a taxable benefit (one specific case of the broader shareholder-benefit rules) — and for a typical owner-manager, that benefit can be surprisingly large. Often it's larger than the tax the arrangement was supposed to save.

TL;DR — The Short Version
  1. A company-owned car you use personally creates two taxable benefits: a standby charge (for having it available) and an operating-cost benefit (for the company paying running costs). Both are added to your personal income.
  2. The standby charge is roughly 2% of the car's original cost per month it's available to you — about 24% of the purchase price per year before reductions. On a $50,000 car, that's a starting point of ~$12,000 added to your income, before any reduction for high business use.
  3. The benefit only shrinks if your business use is more than 50% and your personal driving is low — and you can prove it with a logbook. No logbook, no reduction.
  4. For most owner-managers who don't drive heavily for business, the cleaner option is to own the car personally and have the corporation pay you a tax-free per-kilometre allowance for business kilometres.
  5. The logbook is everything. Whichever route you choose, a kilometre log is what stands between you and a CRA reassessment.

Read on for how each benefit is calculated, the per-kilometre alternative, a side-by-side example, and the documentation that holds up.

The First Benefit

The standby charge: paying tax just for having the car

The standby charge exists because having a company car available for personal use is itself a perk — separate from actually driving it. Under the Income Tax Act, if your corporation owns the vehicle, the standby charge is generally 2% of the original cost of the car, for each month it's available to you. (If the corporation leases the vehicle, it's two-thirds of the lease cost instead.)

Two percent a month works out to about 24% of the purchase price per year, added to your personal income, before any reduction. That's the number that catches people off guard.

Standby Charge — Starting Point (Corporation-Owned Car)
Original cost of vehicle$50,000
Standby rate (2% × 12 months)24%
Annual standby charge before reduction$12,000

This $12,000 is added to your personal income every year you have the car available — on top of the separate operating-cost benefit below. It can be reduced only if business use exceeds 50% and personal kilometres are low.

The Reduction

How to shrink the standby charge (and the trap inside it)

The standby charge can be reduced — but only if you clear a specific bar. You qualify for a reduced standby charge when both of these are true:

The closer your personal driving is to zero, the more the standby charge falls. But miss the 50%-business threshold — even by a little — and you get no reduction at all. The full ~24%-of-cost benefit applies. This is the cliff that makes company cars expensive for owners who mostly drive personally and only occasionally for work.

Source: Income Tax Act paragraph 6(1)(e) (the standby charge) and subsection 6(2) (the reduced standby charge formula and the more-than-50%-business / 20,004 km personal-use conditions); CRA, Automobile provided by the employer.

The Second Benefit

The operating-cost benefit: who paid for the gas?

On top of the standby charge, there's a second, independent benefit. If the corporation pays the vehicle's operating costs — fuel, oil, insurance, maintenance, licensing — and you use the car personally, you have an operating-cost benefit for the personal portion of those costs.

The standard way to calculate it is a flat prescribed per-kilometre rate applied to your personal kilometres. For 2026, that rate is 34¢ per personal kilometre (a reduced rate applies to employees primarily engaged in selling or leasing automobiles). Drive 10,000 personal kilometres in a company car whose costs the corp pays, and that's a $3,400 benefit — again, added to your income, again, on top of the standby charge.

Source: Income Tax Act paragraph 6(1)(k) (operating-cost benefit); the prescribed rate is set annually — 34¢/km for 2026 (28¢ for taxpayers principally employed in selling or leasing automobiles). See CRA, Automobile and motor vehicle benefits.

The Alternative

The per-kilometre allowance: often the cleaner answer

Here's the option many owner-managers should look at first: own the vehicle personally, and have the corporation reimburse you a per-kilometre allowance for business driving.

A reasonable per-kilometre allowance for business use of your own vehicle is not taxable to you, and it's deductible to the corporation. The CRA treats an allowance as reasonable when it's based solely on business kilometres at a rate in line with the prescribed limits. For 2026, those limits are 73¢ per kilometre for the first 5,000 business kilometres and 67¢ per kilometre after that (higher in the territories).

The beauty of this route: no standby charge, no operating-cost benefit, no 2%-per-month surprise. You move money from the corporation to yourself, tax-free, in proportion to real business use — and the corporation gets a deduction. The catch is the same as everywhere else in this article: the allowance must be per-kilometre and reasonable. A flat monthly car allowance that isn't tied to kilometres is taxable.

Source: Income Tax Act paragraph 6(1)(b) (allowances; reasonable per-km allowances for business use are not income); the deductible per-km limits are prescribed in section 7306 of the Income Tax Regulations — 73¢/67¢ for 2026 in the provinces. See CRA, Automobile or motor vehicle allowances.

Side by Side

Which one wins?

The right choice turns almost entirely on how much you drive for business. The figure below shows the pattern.

A company-owned car makes sense mainly for very high business use, where the standby charge can be reduced. For low-to-moderate business use, owning personally and claiming a tax-free per-kilometre allowance is usually cheaper, because the full standby charge and operating benefit otherwise apply. IT TURNS ON YOUR BUSINESS-USE % >50% business + low personal km PER-KM ALLOWANCE COMPANY CAR Low to moderate business use Own personally · tax-free 73¢/67¢ per business km No standby charge · no operating benefit Very high business use Standby charge can be reduced Corp deducts the full vehicle cost (CCA limits apply) Miss the 50%-business threshold and the full standby charge applies — the costly case.
For most owner-managers with low-to-moderate business driving, owning the car personally and claiming a per-kilometre allowance avoids the standby charge entirely. A company car generally wins only when business use is very high.
The Thing That Decides It

The logbook: no log, no defence

Every reduction, every allowance, every favourable outcome in this article depends on one thing: a kilometre log. Business use over 50%? You prove it with a log. Personal kilometres low enough for a reduced standby charge? Log. A "reasonable" per-kilometre allowance? It has to be based on actual business kilometres — which you track in a log.

The CRA accepts a full logbook for the year, or a representative three-month sample backed by a base-year full log. Either way, the record needs the date, destination, purpose, and kilometres for business trips. Without it, the CRA can deny the reduction and assess the full benefit — and there's very little you can do after the fact.

The car decision isn't really about the car. It's about whether you can prove how you drove it.

Before You Buy

A practical checklist

This is exactly the kind of decision that's cheap to get right in advance and expensive to fix after a year of records that don't exist. Setting up the right vehicle treatment — and keeping the log and allowance clean — is part of what's included in every CDL plan, and you can estimate the cost in about a minute.

The Bottom Line

"It's a write-off" is only half the sentence

Buying a car through your corporation isn't automatically smart or automatically a mistake. It's a calculation. The deduction the corporation gets is real — but so is the taxable benefit you personally absorb, and for owners who don't drive heavily for business, that benefit usually wins. The per-kilometre allowance on a personally owned car is simpler, often cheaper, and far harder to get wrong.

Whichever way you go, keep the logbook. It's the difference between a defensible position and an expensive one.

A Real-World Example

The SUV that cost more in tax than it saved

Meet Tom, an incorporated realtor in London, Ontario. A buddy told him to "buy the SUV through the company — it's a write-off," so Tom's corporation bought a $58,000 SUV. The trouble is how Tom actually drives it: school runs, weekend trips, the occasional client showing. Honest business use is maybe 35%.

Because his business use is under 50%, Tom gets no reduction to the standby charge. Roughly 24% of the vehicle's cost — around $14,000 — plus the operating-cost benefit gets added to his personal income on his T4, every single year he has the SUV available. The corporation did get to deduct the vehicle costs, but the personal taxable benefit dwarfs that deduction. Tom is paying tax on a "perk" he barely uses for work.

"It's a write-off" was true. It just wasn't the whole sentence.

What should have happened: at 35% business use, Tom should have kept the SUV in his own name and had the corporation pay him a tax-free per-kilometre allowance for the business trips — no standby charge, no operating benefit, far less tax.

Thinking about putting a vehicle through the company?

Run it past us first. A 20-minute call is usually enough to tell whether a company car or a mileage allowance leaves you better off.

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This article is for informational purposes only and does not constitute tax advice. Automobile benefit rules are detailed and fact-specific, and the prescribed rates and limits change annually. The 34¢ operating-benefit rate and 73¢/67¢ allowance limits cited are for 2026. Consult a qualified professional before deciding how to hold and expense a business vehicle.

References

Primary sources, linked so you can read and interpret them yourself. Legislative links open on the official Justice Laws Website; agency links open on Government of Canada websites.