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T4 Code 34 — Personal use of employer's automobile

Taxable benefit from a company vehicle — standby charge + operating benefit — already included in Box 14.

At a glance — Code 34

Box name
Personal use of employer's automobile
T1 line
Not reported on T1 directly
Check against
Your mileage log: total km driven vs personal-use km; the standby-charge formula uses the ratio.

What Code 34 means

Code 34 reports the taxable benefit from having an employer-provided vehicle available for personal use. It has two components: the standby charge (deemed availability) and the operating-expense benefit (gas, maintenance paid by employer).

The standby charge is generally 2% of the vehicle's cost per 30-day period available, or 2/3 of the lease cost per month. The reduced standby charge applies only if all three conditions are met: your employer required you to use the vehicle in your duties, more than 50% of the total distance driven was business driving, and your personal driving stayed within 1,667 km per 30-day period (20,004 km in the year). Note the 20,004 km is a ceiling on personal kilometres, not a business-driving target.

The operating-expense benefit is 34 cents per personal-use kilometre for 2025 and 2026 (up from 33 cents in 2024 — the Department of Finance announces the rate annually each December; a lower rate applies if your job is selling or leasing automobiles). Instead of the per-kilometre rate, the benefit can be calculated as half the standby charge under CRA's optional calculation, but only where a standby charge is already in your income, you used the vehicle more than 50% for employment, and you told your employer in writing before the end of the year that you wanted that method.

Tax return implications

  • Already in Box 14 and Box 40 — do not add to Line 10100.
  • Keep a detailed mileage log for the whole year — CRA audits Code 34 benefits heavily.
  • If your personal-use fraction dropped (e.g., COVID year), ask payroll to recalculate — the benefit may be materially lower.

FAQ

Can I reduce my Code 34 benefit by paying my employer for gas?

Yes. Any amount you pay the employer out-of-pocket for operating costs (gas, maintenance) within 45 days of year-end reduces the operating-expense benefit dollar-for-dollar. Payments for personal-use standby are limited to reducing the standby charge portion.

Related T4 boxes

Filing your return? Use the payroll deductions calculator to verify the amounts on your T4 match expected CPP, EI and income tax withholdings, and the income tax calculator to estimate your refund or balance owing.

Sources

T4 box definitions from CRA T4 employer guide. Rates and thresholds current for 2025; file your 2025 T1 by April 30, 2026 (self-employed June 15).

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