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 get useful in determining location to buy. However, if you are trying avoid the car tax in your home address, then go ahead and buying a house to park your car in because unless you have a house or live the state in question you risk tax evasion. Car dealers and local motor vehicle registratio...