Motor vehicle sales tax rates differ greatly within the United Levels. Car tax by state often varies within counties and cities. If you are moving to another state, calculating car tax prior to moving possibly be useful in determining to view the leonids to own. However, if you are trying to avoid the car tax in a home office address, then go ahead and buying a house to park your car in because unless you have a house or occupy the state in question you risk tax evasion. Car dealers and nati...