Hmmmm... just an idea -and favourite bugbear of mine- why not combine it with mandatory car insurance? Just get the taxes when insurance is paid like fire levy or EQC for houses? And before you write a response, if you cannot afford insurance for your car you shouldn't be driving a car because if something does happen in traffic it means you will either ruin the rest of your life or start down the criminal part of life. Both scenarios are the absolute worst outcome we want as a society. To counter that you could again find other ways to subsidise low income earners (e.g. zero tax to 1st $20K earned or something)