RCW 82.87.090: Other taxes.

The tax imposed under this chapter is in addition to any other taxes imposed by the state or any of its political subdivisions, or a municipal corporation, with respect to the same sale or exchange, including the taxes imposed in, or under the authority of, chapter 82.04, 82.08, 82.12, 82.14, 82.45, or 82.46 RCW.