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.A Business Purchase Agreement essentially functions as a formal record of the sale and purchase, akin to a Bill of Sale for a business. A retail installment sale is a transaction between you and a dealer to purchase a vehicle where, you agree to pay the dealer over time. Fill out this form to take advantage of this great offer. Use this form to gather necessary information when you sell your vehicle or vessel. Download Washington Buy-Sell Agreement template, modify and send for signing using BoloForms Signature. Sale Price does include all Ford motor company rebates that customer qualifies for.