A payment plan agreement outlines an installment plan to repay an outstanding balance over a specified time frame. The Buyer agrees to pay.A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price. PARTIES: The parties to this contract are. (Seller) and. (Buyer). Download our free blank purchase agreement template in Word or PDF format: sample real estate purchase agreement template. A purchase agreement is a form used for making an offer on a home. It contains a set of conditions and contingencies that are presented to the seller of a home. Use our free payment plan agreement form to spell out all the terms and conditions of a loan if you need to establish a payment schedule with someone. The law of any state requires you to prepare a purchase contract for buying and selling a home building.