For the Ford Mondeo 1.8 driver, for example, it means he currently pays £984 in tax on his fuel card for the year. But from April 6 he will pay an extra £156 to make the total card tax £1,140. The tax, which must be paid in full at the start of the tax year, will leave many company car drivers wondering if it is worth carrying on with the cards - and they have only until 6 April to make up their minds.