If you already own the car then you dont have to pay tax on it, you just have to register it and get paltes. Its like 90 bucks to register and get your plates. If you live in Il. and just bought the car and are transfering titles and registering, then its like anything you payed for a car over 15k is 1000 dollars in tax. Under that it is also broken down but I can rember the exact break down.