Washington Revised Code Title 82. Excise Taxes § 82.04.080. “Gross income of the business”

(1) “Gross income of the business” means the value proceeding or accruing by reason of the transaction of the business engaged in and includes gross proceeds of sales, compensation for the rendition of services, gains realized from trading in stocks, bonds, or other evidences of indebtedness, interest, discount, rents, royalties, fees, commissions, dividends, and other emoluments however designated, all without any deduction on account of the cost of tangible property sold, the cost of materials used, labor costs, interest, discount, delivery costs, taxes, or any other expense whatsoever paid or accrued and without any deduction on account of losses.

(2) Financial institutions must determine gains realized from trading in stocks, bonds, and other evidences of indebtedness on a net annualized basis. For purposes of this subsection, a financial institution means a person within the scope of the rule adopted by the department under the authority of RCW 82.04.460(2).