Motor vehicle sales tax rates differ greatly in your United Tells. Car tax by state often varies within counties and urban centers. If you are moving to another state, calculating car tax prior to moving will be useful in determining when and where to grab. However, if you are trying avoid the car tax away from your home address, go ahead and buy a new home to park your car in because unless you possess a house or occupy the state in question you risk tax evasion. Car dealers and native motor ve...