Wash. Rev. Code § 50.12.080
If any employing unit fails to make or file any report or return required by this title, or any regulation made pursuant hereto, the commissioner may, upon the basis of such knowledge as may be available to him or her, arbitrarily make a report on behalf of such employing unit and the report so made shall be deemed to be prima facie correct. In any action or proceedings brought for the recovery of contributions, interest, or penalties due upon the payroll of an employer, the certificate of the department that an audit has been made of the payroll of such employer pursuant to the direction of the department, or a certificate that a return has been filed by or for an employer or estimated by reason of lack of a return, shall be prima facie evidence of the amount of such payroll for the period stated in the certificate.
RCW 50.12.080
Conflict with federal requirements-Effective dates-Construction-1983 1st ex.s. c 23: See notes following RCW 50.04.073.