Vehicle Purchase Agreement is a document including all terms of purchasing a car. This agreement serves as a sales agreement between the buyer and the seller. If you are purchasing a used vehicle from a private seller, the seller may ask you to sign a bill of sale- a very simplified form of car purchase agreement. This agreement proves that the possession of the vehicles has been transferred from the seller to the buyer. Our website provides you with plenty of vehicle purchase agreement templates, such as Used car Sales Agreement and Vehicle Purchase and Sale Agreement.