Car and van fuel benefit rates
If fuel is provided for private use in a company van or company car and it is not reimbursed a fuel benefit charge arises. From 6 April 2017 the car fuel benefit increases to £22,600 and the van fuel benefit to £610.
The taxable benefit is a percentage of this car fuel charge, which is determined from the CO2 emissions of the vehicle. You need to be doing an awful lot of private miles in a company car to make the fuel benefit worthwhile having as a taxable benefit in kind!