Car tax 2018 - Diesel cars which will cost up to £500 more to tax from April REVEALED CAR tax for a number of diesel car models and drivers in the UK will increase from April 1st. Here is a list of cars that will cost more in car tax from April 1st. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:New Volvo software update with offer Polestar performance to existing V90, V60 and XC40Hennessy Venom F5 specs update - Will the car be able to hit over 300mph top speed?Rolls Royce resurrect iconic Silver Ghost in stunning limited edition runNew diesel cars face £40 parking charge in major UK city in emissions clampdownCar tax WARING - Drivers in rural areas could be charged more than city motoristsFully self-parking cars could be on the roads in the UK within the next few years