Motor vehicle sales tax rates differ greatly within your 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 is useful in determining where and when to own. However, if you are trying to stop the car tax from your own home address, then go ahead and buy a house to park your car in because unless or you own a house or have a home in the state in question you risk tax evasion. Car dealers and native motor ...