You'll likely need certain documents when you sell your car, though requirements can vary from state to state. Check with your state's Department of Motor Vehicles (DMV) to learn more about what's required for a car sale. Depending on where you're located, you may need the following to transfer ownership: Your car's title Maintenance records Odometer reading Warranty information Vehicle history report License plates While it's not required, getting a bill of sale could also be a good idea. Basically, this is a notarized document that outlines the terms and conditions of the sale. It's designed to offer protection against liability after the sale is complete.