Company car and fuel benefit-in-kind The taxable benefit on your company car is based on the CO2 emissions of the car. These calculations are for the 2017/18 tax year. List Price (£): The list price of the car and the cost of any optional extras. Contribution to cost (£): The amount of any contribution made to the cost of the car (max £5000). Paid for private use (£): The amount paid to the employer over the whole year for any private use. CO2 emissions (gm/km): The approved CO2 emissions of the vehicle - you can look it up on the offical government website Fuel type: Petrol Diesel The fuel type of vehicle Private fuel: Does your employer pay for any private fuel for a company car? Calculate Note: These calculations are only for illustrative purposes and are not a substitute for professional advice.