A vehicle invoice is a receipt declaring the price at which a dealer purchases a vehicle from the vehicle manufacturer. The dealer normally sells the car at a rate that is above the rate mentioned on the invoice in order to attain maximum profit. But some dealers will sell the vehicle at a price that is either close to or lower than the invoice price. Normally this price incentive is between 1-3%. These invoices should be kept in a safe place so that whenever you wish to sell the car you may negotiate for the price which best suits you.