Motor vehicle sales tax rates differ greatly while in the United Levels. Car tax by state often varies within counties and locations. If you are moving to another state, calculating car tax prior to moving possibly be useful in determining location to own. However, if you are trying stay clear of the car tax from your own home address, then go ahead and buy a house to park your car in because unless you keep a house or are in the state in question you risk tax evasion. Car dealers and local ...