PDFRCW 82.04.4286
Deductions—Nontaxable business.
In computing tax there may be deducted from the measure of tax amounts derived from business which the state is prohibited from taxing under the Constitution of this state or the Constitution or laws of the United States.
[ 1980 c 37 s 7. Formerly RCW 82.04.430(6).]
NOTES:
Intent—1980 c 37: See note following RCW 82.04.4281.