Setoff must be pleaded.

RCW 4.32.150 — under Chapter 4.32 Pleadings..

RCW 4.32.150

To entitle a defendant to a setoff he or she must set the same forth in his or her answer.[ 2011 c 336 s 104; Code 1881 s 502; 1877 p 108 s 506; RRS s 271.]