Washington Revised Code Title 39. Public Contracts and Indebtedness § 39.12.100. Independent contractors--Criteria

(1) The individual has been and is free from control or direction over the performance of the service, both under the contract of service and in fact;

(2) The service is either outside the usual course of business for the contractor or contractors for whom the individual performs services, or the service is performed outside all of the places of business of the enterprise for which the individual performs services, or the individual is responsible, both under the contract and in fact, for the costs of the principal place of business from which the service is performed;

(3) The individual is customarily engaged in an independently established trade, occupation, profession, or business, of the same nature as that involved in the contract of service, or the individual has a principal place of business for the business the individual is conducting that is eligible for a business deduction for federal income tax purposes other than that furnished by the employer for which the business has contracted to furnish services;

(4) On the effective date of the contract of service, the individual is responsible for filing at the next applicable filing period, both under the contract of service and in fact, a schedule of expenses with the internal revenue service for the type of business the individual is conducting;

(5) On the effective date of the contract of service, or within a reasonable period after the effective date of the contract of service, the individual has an active and valid certificate of registration with the department of revenue, and an active and valid account with any other state agencies as required by the particular case, for the business the individual is conducting for the payment of all state taxes normally paid by employers and businesses and has registered for and received a unified business identifier number from the state of Washington;

(6) On the effective date of the contract of service, the individual is maintaining a separate set of books or records that reflect all items of income and expenses of the business which the individual is conducting; and

(7) On the effective date of the contract of service, if the nature of the work performed requires registration under chapter 18.27 RCW or licensure under chapter 18.106, 19.28, or 70.87 RCW, the individual has the contractor registration and contractor licenses required by the laws of this state including chapters 18.27, 18.106, 19.28, and 70.87 RCW.