Quadri-, quadru-, quadr-is a Latin prefix related to the verb quadrare âto make squareâ, quadratus âsquareâ etc. Quad is simply an English shortening of quadrangle, quadruplet etc. So quadri-and quad are actually the same word.
Seattle, WA Sales Tax Rate. The current total local sales tax rate in Seattle, WA is 9.600% . The December 2014 total local sales tax rate was 9.500% .
Effective July 1, 2010 the individual tax rate is 1.5% for residents and 0.75% for nonresidents. The corporation tax rate is 1.5%. Prior to July 1, 2010, the individual tax rate is 1.3% for residents and 0.65% for nonresidents. The corporation tax rate is 1.3%.