Company Car Tax (BIK) Calculator
Work out the Benefit-in-Kind percentage and income tax on your company car from its P11D value, CO2 emissions and fuel type — for the 2026/27 tax year.
Estimate only. 2026/27 rates — estimate, verify with gov.uk / DVLA; speeding fine is an estimate, the court decides.
Enter your P11D value and CO2 figure
Your BIK percentage, taxable value and income tax appear here as you type.
How company car tax (Benefit-in-Kind) works
If your employer provides a car you can use privately, HMRC treats it as a taxable benefit. The taxable value is the car's P11D value multiplied by an "appropriate percentage" set by its CO2 emissions — 3% for fully electric cars, rising through bands based on electric-only range for plug-in hybrids (1-50 g/km), then up in 1% steps for every extra 5 g/km of CO2 above 54 g/km, capped at 37%. Diesel cars that don't meet the RDE2 standard pay an extra 4 percentage points. You then pay income tax on that taxable value at your marginal rate — 20%, 40% or 45% — usually collected through your tax code via PAYE.