Wis. Stat. § 71.85: General provisions.

(1) Penalties not deductible. No penalty imposed by this chapter, including penalties imposed under s. 71.83 (1) (a) 3., 4. and 5. and (b) 2., 3. and 4. and (2) (a) 1., 4. and 5., or by subch. III of ch. 77 may be deducted from gross income in arriving at net income taxable under this chapter.

(2) Prosecutions by attorney general. The attorney general is authorized, upon request of the secretary of revenue, to represent the state or to assist the district attorney in the prosecution of any case arising under s. 71.83 (2) (a) 1. or (2) (b) 1. or 2.