The taxable benefit on your company car is based on the CO2 emissions of the car. These calculations are for the 2018/19 tax year.
The list price of the car and the cost of any optional extras.
The amount of any contribution made to the cost of the car (max £5000).
The amount paid to the employer over the whole year for any private use.
Does your employer pay for any private fuel for a company car?
Note: These calculations are only for illustrative purposes and are not a substitute for professional advice.