The Automobile Standby Charge: What a Company Car Really Costs in Tax for Ontario Owners

Giving yourself a company car can feel like a straightforward perk of owning your own business. It isn't. When an Ontario corporation provides a vehicle to a shareholder-employee for personal use, the Income Tax Act treats that access as a taxable benefit — and the calculation is more involved, and less forgiving, than most owner-managers expect.

The automobile standby charge is the main piece of that calculation, and it applies whether or not you actually drive the car very much. A vehicle that mostly sits in the driveway can still generate a meaningful taxable benefit, simply because it was available to you.

This guide explains how the standby charge works, what separately gets taxed as an operating cost benefit, what can reduce the amount, and why shareholder-employees in particular need to get the paperwork right.

Two Separate Benefits, Not One

CRA treats personal use of a company vehicle as generating up to two distinct benefits, calculated separately and added together:

1. The standby charge — the value of simply having the vehicle available to you for personal use, calculated using a formula tied to the vehicle's cost or lease payments and the number of months it was available to you. This applies even in a month where you barely drove it.
2. The operating cost benefit — a separate amount for the actual personal-use portion of operating expenses (fuel, insurance, maintenance) where the corporation pays those costs, generally calculated using a per-kilometre rate that CRA sets and updates from time to time.

Both figures — the percentages used in the standby charge formula and the per-kilometre operating cost rate — are set by CRA and can change. Rather than quote a number that may already be out of date by the time you read this, confirm the current figures with an accountant or CRA's own guidance before calculating your specific benefit.

Owned vs. Leased Vehicles Use Different Math

The mechanics differ depending on how the corporation holds the vehicle:

• Owned vehicles use a formula based on the vehicle's original cost.
• Leased vehicles use a formula based on the lease payments instead.

The two methods don't always produce the same result for otherwise similar vehicles, which is one reason lease-versus-buy decisions for a company car are worth running past an accountant before you commit, not after.

What Reduces the Standby Charge

The standby charge can be reduced — sometimes substantially — where certain conditions are met. In general terms, the reduction depends on:

• [ ] The vehicle being used primarily for business purposes rather than personal purposes
• [ ] Your personal driving staying below a low threshold that CRA sets for this purpose
• [ ] The employer requiring the vehicle for business use, not simply making it available as a convenience
• [ ] A contemporaneous mileage log that actually supports the business-use claim

Without solid mileage records, CRA will generally not accept a reduced calculation even if your actual use pattern would have qualified. The full standby charge is the default; the reduction is something you have to be able to prove.

Why Shareholder-Employees Face Extra Scrutiny

For an ordinary employee, a company car is a straightforward employment benefit. For a shareholder-employee, CRA looks more closely at whether the benefit is really tied to genuine employment duties or is instead a personal perk dressed up as a business expense.

This matters because the tax treatment can diverge depending on the answer:

• If you're genuinely an employee performing real duties, the standard employee vehicle-benefit rules apply.
• If the vehicle is really a shareholder perk with no meaningful employment relationship behind it, CRA may instead treat it as a shareholder benefit — a different category with its own consequences, and generally a less favourable one.

The practical lesson: shareholder-employees who use a company car should be able to show they are actually employees doing actual work, with a T4 and a real job description, not just owners who happen to also draw a vehicle from the business.

Recordkeeping That Protects You on Audit

1. Keep a mileage log recording the date, destination, purpose, and distance of every trip — ideally kept in real time, not reconstructed later.
2. Record the odometer reading at the start and end of each year.
3. Retain the vehicle's purchase agreement or lease contract, since the calculation method depends on it.
4. Keep receipts for any operating costs the corporation pays on the vehicle's behalf.
5. Revisit the calculation each year — the vehicle's use pattern, and the rates CRA applies, can both change.

Frequently asked questions