Motor vehicle sales tax rates differ greatly while in the United States in the usa. Car tax by state often varies within counties and locations. If you are moving to another state, calculating car tax prior to moving is useful in determining where and when to decide to purchase. However, if you are trying in order to avoid the car tax in your own home address, go ahead and buy a house to park your car in because unless you possess a house or live in the state in question you risk tax evasion. Ca...