Any variation to this Car Sale Agreement shall be made in writing and signed by both Parties. 7. GOVERNING LAW, DISPUTES AND ARBITRATION. It is agreed that: 7.1 This Car Sale Agreement is subject to the sole jurisdiction of the laws of ::State/Country::. A Vehicle Purchase Agreement is a sales agreement between the buyer and the seller and is an integral requirement when registering your vehicle. If you are purchasing a second-hand car from a private seller, the seller may ask you to sign a bill of sale, a simplified form of a Car Purchase Agreement. Federal law dictates that a Vehicle Sales Agreement must include a disclosure by the Seller of the vehicle's odometer reading at the time of the sale. Further, state laws cover commercial transactions and business. For example, in Louisiana, Maryland, Nebraska, Wyoming, and West Virginia, a Vehicle Sales Agreement must be certified by a notary.