Motor vehicle sales tax rates differ greatly while in the United Usa. Car tax by state often varies within counties and municipalities. If you are moving to another state, calculating car tax prior to moving get useful in determining location to decide to purchase. However, if you are trying in order to avoid the car tax from your home address, go ahead and buy a house to park your car in because unless you possess a house or occupy the state in question you risk tax evasion. Car dealers and nat...