Wash. Rev. Code § 82.03.180
Judicial review of a decision of the board of tax appeals shall be de novo in accordance with the provisions of RCW 82.32.180 or 84.68.020 as applicable except when the decision has been rendered pursuant to a formal hearing elected under RCW 82.03.140 or 82.03.190, in which event judicial review may be obtained only pursuant to RCW 34.05.510 through 34.05.598: PROVIDED, HOWEVER, That nothing herein shall be construed to modify the rights of a taxpayer conferred by RCW 82.32.180 and 84.68.020 to sue for tax refunds: AND PROVIDED FURTHER, That no review from a decision made pursuant to RCW 82.03.130(1)(a) may be obtained by a taxpayer unless within the petition period provided by RCW 34.05.542 the taxpayer shall have first paid in full the contested tax, together with all penalties and interest thereon, if any. The director of revenue shall have the same right of review from a decision made pursuant to RCW 82.03.130(1)(a) as does a taxpayer; and the director of revenue and all parties to an appeal under RCW 82.03.130(1)(e) shall have the right of review from a decision made pursuant to RCW 82.03.130(1)(e).
RCW 82.03.180
Effective date-1989 c 175: See note following RCW 34.05.010.