A master purchase agreement is a legally binding contract between buyer and seller, and typically relates to buying and selling goods rather than services. The Buyer has agreed to buy and the Seller has agreed to sell the Shares and the Assets, which represent the Business, on the terms set out in this Agreement.Here's everything you need to know about a car sale contract so you're prepared when it comes time to make a purchase. General Applicability. Contract for sale with an incomeeligible qualified home buyer. The tax is a debt of the purchaser until paid to the dealer. The dealer will remit the tax to the county tax assessor-collector.