A business purchase agreement should detail the names of the buyer and seller at the start of the contract. The easiest way to create a Business Purchase Agreement is to use a template that is customized to your state.When buying the assets of a business, some are subject to sales or use tax, while others are not. Items subject to retail sales tax. Define all terms used within the agreement. Download free Purchase Agreement Templates adjusted to Washington laws. For Real Estate, Stocks, Land, Business and more. A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price.