CRA Logbook Rules and Vehicle Expenses in Canada: What You Can Deduct in 2026

By OptiVal Editorial Desk

If you drive for work, the CRA lets you deduct the business portion of your vehicle costs. Fuel, insurance, maintenance, lease payments, loan interest and depreciation all qualify, but only for the kilometres you drive to earn income. The catch is proof. The CRA logbook rules are the part most owners get wrong, and a weak logbook is one of the easiest ways to lose a deduction in an audit. Here is what the rules actually require, plus the 2026 limits you need before you buy, lease or claim.

What counts as business driving (and what does not)

Business driving is travel between work locations: client visits, trips to suppliers, driving between two job sites, or travelling to a temporary work location. Driving from home to your regular place of business is commuting, and commuting is personal. It never counts, no matter how long the drive is.

There is one useful exception. If your home qualifies as your principal place of business (the same test behind the home office expenses rules), trips from home to clients or suppliers generally count as business driving. This is one reason the home office rules and the vehicle rules tend to show up together at audit time.

How the CRA logbook rule works

The CRA expects a logbook that records, for each business trip: the date, the destination, the business purpose, and the kilometres driven. You also record odometer readings at the start and end of the year, so business kilometres can be measured against total kilometres.

Keeping a detailed logbook every day, forever, is the gold standard. But the CRA offers a simplified option many owners never hear about:

1. Keep a full logbook for one complete 12-month period. This becomes your base year.
2. After that, you can keep a logbook for just one representative three-month stretch (a sample quarter) and apply that business-use percentage to the full year.
3. The sample only holds if your driving pattern stays within about 10 percent of the base year. If your business use shifts materially, you need to establish a new base year.

The CRA’s formula: (sample-period business-use % / base-year same-period %) x base-year annual % = calculated annual business use. If the result lands within 10 points of the base year percentage, you can use it for the whole year.

Practical advice: keep the logbook in an app or a simple spreadsheet from day one. Reconstructing a year of driving from memory in April, after the CRA asks, does not go well.

The 2026 limits: what you can actually claim

The Department of Finance sets new automobile limits each year. For 2026, announced January 14, 2026 and effective January 1:

• Tax-free per-kilometre allowance for employees using their own car: 73 cents per km for the first 5,000 km, then 67 cents per km. (Territories get an extra 4 cents per km.)
• CCA ceiling for Class 10.1 passenger vehicles: $39,000 before tax, up from $38,000. Applies to vehicles acquired on or after January 1, 2026.
• CCA ceiling for Class 54 zero-emission passenger vehicles: $61,000 before tax, unchanged.
• Maximum deductible lease cost: $1,100 per month before tax, unchanged.
• Maximum deductible loan interest: $350 per month, unchanged.
• Taxable operating benefit where the employer pays for personal driving: 34 cents per personal kilometre, unchanged.

Three details that trip people up:

First, the $39,000 ceiling means a $55,000 sedan only gets $39,000 of capital cost for CCA purposes. The extra $16,000 is simply not deductible, ever. An eligible zero-emission passenger vehicle gets the $61,000 Class 54 ceiling instead.

Second, a vehicle over the ceiling does not just get capped inside a normal class. Each one forms its own separate Class 10.1, which means no recapture and no terminal loss when you sell it. That changes the math on disposal, so plan for it.

Third, the per-kilometre allowance is for employees using their own car. Self-employed owners cannot multiply business kilometres by 73 cents and deduct the result. You must claim your actual expenses, prorated by business use.

Employees: keeping the kilometre allowance tax-free

If your corporation pays you (or staff) a per-kilometre allowance, it can be tax-free, but only if three conditions all hold: it is based solely on actual business kilometres driven, it uses a rate at or below the CRA prescribed rate, and it is not combined with other reimbursements for the same costs, like fuel, insurance or lease payments. Fail any one of these and the entire allowance becomes taxable income, not just the excess over the limit.

Flat monthly car allowances are the classic failure. Paying yourself or a staff member “$500 a month for the car” without tracking kilometres creates a taxable benefit and a payroll reporting mess. If you want tax-free, track the kilometres.

GST/HST: do not forget the input tax credits

If you are GST/HST registered, you can claim input tax credits on the business portion of running costs: fuel, maintenance, and the tax on lease payments, among others. Two cautions:

• ITCs on the vehicle purchase itself are capped at the tax payable on the Class 10.1 ceiling. For a 2026 purchase that means the tax on $39,000. Buy above the ceiling and you cannot recover the extra tax.
• ITCs on lease payments and running costs are prorated by business use. Over-claiming ITCs on a vehicle with heavy personal use is a standard audit adjustment, and the logbook is what defends it.

The mistakes that cost owners at audit time

1. No logbook at all, just an estimate of “about 70 percent business.” The CRA routinely disallows this.
2. Claiming 100 percent business use on a vehicle the family also drives. If it is the only car in the household, expect skepticism.
3. Deducting a per-kilometre amount as a self-employed person instead of actual expenses.
4. Ignoring the caps: CCA on the full purchase price of a $60,000 car, or interest above $350 a month.
5. Forgetting the standby charge and operating benefit when a corporation covers an employee’s or shareholder’s personal driving.

None of these are exotic. They show up in routine CRA reviews of small businesses every year, and every one of them is preventable with a logbook and a calculator.

The bottom line

Vehicle expenses are one of the most valuable deductions available to an owner who drives for work, and one of the most frequently reduced on review. The difference between keeping the deduction and losing it is almost always the logbook. Start one now, keep it honest, and check the annual limits before you buy or lease your next vehicle.

Drive for work and not sure your vehicle claims would survive a CRA review? We help Canadian small businesses keep clean books and claim everything they are entitled to, nothing they are not. Bookkeeping plans start at $199/month, and a catch-up or cleanup starts at $45/hour. Book a free consultation and we will take a look.