This paper presents the results of a behavioral field experiment conducted by the Washington DOR using approximately 1,250 firms (sole proprietorships, partnerships, and corporations) as subjects during the 2003 excise tax filing season. Specifically, the DOR invited the researchers to experimentally test different methods for improving compliance with the use and business and occupation (B&O) taxes. The focus of this experiment was on augmenting the use tax collections by businesses in the construction industry. The construction industry is especially problematic regarding use tax compliance and has one of the highest noncompliance rates in Washington State.