Motor vehicle sales tax rates differ greatly inside a United Tells. Car tax by state often varies within counties and municipalities. If you are moving to another state, calculating car tax prior to moving is useful in determining when and where to grab. However, if you are trying avert the car tax from your home address, go ahead and get a house to park your car in because unless your very own a house or occupy the state in question you risk tax evasion. Car dealers and native motor vehicle reg...