If your car was built before 1 January 1981, it’ll be exempt from vehicle tax from April 2021. If you don’t know when your car was built but you know it was registered before 8 January 1981, the same rule applies. This exemption is rolling, too - so from 2022, the dates will change to include cars registered in 1982. Remember that you must tax your vehicle even if you don't have to pay as well.