Wash. Rev. Code § 82.32.360
Upon approval of such agreement, evidenced by execution thereof by the department of revenue and the person so agreeing, the agreement shall be final and conclusive as to tax liability or tax immunity covered thereby, and, except upon a showing of fraud or malfeasance, or of misrepresentation of a material fact:
[ 1975 1st ex.s. c 278 s 93; 1961 c 15 s 82.32.360. Prior: 1945 c 251 s 2; Rem. Supp. 1945 s 8370-226.]
Construction—Severability—1975 1st ex.s. c 278: See notes following RCW 11.08.160.