Wis. Stat. § 70.575: State assessment, time.

The department, not later than August 15 in each year, shall total the assessments of counties made by the department of revenue under s. 70.57, and the total shall be known as the state assessment and shall be the full market value of all general property of the state liable to state, county and local taxes in the then present year. The department shall enter upon its records such state assessment.