Form 4797, sale of business property. When selling your business, you'll need to decide between an asset sale or a stock sale.It's important to understand how asset sales work. The primary document that evidences an agreement to buy or sell a business (entity purchase or asset purchase) is the purchase contract. Buying a Business in Arizona. Brokers, Pros and cons: Business brokers are a good place to find an Arizona business. Find out which types of taxes you need to pay as a business owner in Arizona. You must prepare a sales agreement to sell your business officially. This document allows for the purchase of assets or stock of a corporation. Browse 55 AZ Business Assets for sale on BizBuySell.