Motor vehicle sales tax rates differ greatly inside a United Usa. Car tax by state often varies within counties and municipalities. If you are moving to another state, calculating car tax prior to moving will useful in determining where and when to decide on. 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 own a house or live the state in question you risk tax evasion. Car dealers and local motor ve...