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Car dealerships use a car purchase agreement, or car sale agreement, to finalize a sale. These contracts serve as a sales agreement between the buyer and seller. If you are purchasing a used vehicle from a private seller, the seller may ask you to sign a bill of sale, which is a very simplified form of car purchase agreement.
A purchase agreement is a written agreement between two or more parties to buy and sell something. You generally use one when you buy or sell something for more than $500. Usually purchase agreements are for the sale of goods, but you can use them for other transactions.