Washington Revised Code Title 82. Excise Taxes § 82.04.180. “Successor”

(a) Any person to whom a taxpayer quitting, selling out, exchanging, or disposing of a business sells or otherwise conveys, directly or indirectly, in bulk and not in the ordinary course of the taxpayer's business, more than fifty percent of the fair market value of either the (i) tangible assets or (ii) intangible assets of the taxpayer; or

(b) A surviving corporation of a statutory merger.