These "documentation fees', which are legitimate charges for sales contract preparation and filing, can vary dramatically from state to state, and in some states are UNLIMITED. Do your research before you go into the dealership. Call or check the website for your state Department of Motor Vehicles to find out how much you should be paying. Some states are $80 while others are upwards of $599! This fee will go into the total price for sales tax calculation, which is ultimately factored into your monthly payment, should you be financing. Yikes! No worries.. if you are in a state with high "doc fees" try to negotiate the price of the vehicle down to offset that cost! You and your smart self will be cruisin' around in your new car in no time! -LeeAnn
https://www.edmunds.com/car-buying/what-fees-should-you-pay.html