This guide is created to help you understand. Washington's tax structure It's intended to provide an overview of the taxes that apply to various business.00471) of your gross receipts. Get a comprehensive analysis of your business's financial health with our accurate and reliable business valuation in Washington. A business valuation assesses the economic value of part or all of a business. Business valuations are used in a number of circumstances. When buying an existing business, is there a set formula or market standard for valuing the business? For most small businesses, the earnings calculation commonly used is called "SDE" ("Seller's Discretionary Earnings"). This article will help you understand the factors that affect your business' value and the different methods for calculating it. Use Schedule C (Form 1040) to report income or (loss) from a business you operated or a profession you practiced as a sole proprietor.