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.