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.When you sell your business, you may need to report all or part of the sale on your excise tax return. Also, you may be required to collect retail sales tax. Comprehensive guide on How to sell your business in Washington State. Successfully sell your company in the Pacific Northwest. The process is comprised of four general steps: conversation, letter of intent, definitive documentation and closing. In an asset sale, the new owner purchases the business's physical assets. The seller retains all rights to the legal entity. (1) Prepare business for sale including updating financial documents and list of business assets and debts in order to get the business potentially valued.