Tetra Tech EC, Inc. v. Wisconsin Department of RevenueAnnotate this Case
The term “processing” in Wis. Stat. 77.52(2)(a)11. includes the separation of river segment into its component parts.
The Wisconsin Department of Revenue imposed a tax on Petitioners pursuant to section 77.52(2)(a)11. for the “processing” of river sediments into reusable sand, waste sludge, and water. The Wisconsin Tax Appeals Commission upheld the Department’s determination. Petitioners filed a petition for judicial review, arguing that the term “processing” is not expansive enough to cover the separation of river sediment into its component parts. The circuit court and court of appeals affirmed. The Supreme Court affirmed, holding (1) Petitioners were liable for the sales and use tax imposed by section 77.52(2); and (2) although the Court has decided to end the practice of deferring to administrative agencies’ conclusions of law, pursuant to Wis. Stat. 227.57(10), the Court will give “due weight” to the experience, technical competence, and specialized knowledge of an administrative agency as it considers its arguments.