a vehicle purchase agreement is an agreement between the buyer and the seller. this agreement is also used in terms of the vehicle’s bill of sale. moreover, the simplest form of a purchase agreement is a bill of sale. it is an important document for the private individual because it acts as proof that he/she is no longer in possession of the vehicle. it is just one page long and contains the following data; the purchases made with dealerships are more complex to sign, especially in case the buyer is financing a new vehicle. but if you are buying it for the second time, the documents are simple and easy to understand. the information of co-signer or co-owner is mentioned in the contract as well. the most important details may include such as the buyer name and address, his date of birth, and social security number.