The new 2017 rates will apply tax to all new cars which produce 1g/km or more. The first-year payment will stay, although the rates will change considerably. But the annual rate thereafter will also change, to a flat rate of £140.
In addition, there will be a new supplement of £310 per year on cars costing more than £40,000 - even zero-emission electric cars. This will be payable for the first five years the car is subject to the new standard rate of tax - or in other words, from the second to the sixth year of the car's life.
Make sure you get it bought and registered before 1 April 2017.