Motor vehicle sales tax rates differ greatly within your United States. Car tax by state often varies within counties and urban centers. If you are moving to another state, calculating car tax prior to moving get useful in determining when and where to decide to purchase. However, if you are trying avert the car tax from your own home address, then go ahead and get a house to park your car in because unless you keep a house or are in the state in question you risk tax evasion. Car dealers an...