Wisconsin Statutes Insurance (Ch. 600 to 655) § 601.935. Penalties

(1) Late payment.An insurer that fails to make quarterly payments under s. 601.93(2) of at least 25 percent of either the total fire dues paid for the previous calendar year or 80 percent of the actual fire dues for the current calendar year is liable, in addition to the amount due, for interest of 1.5 percent of the amount due and unpaid for each month or part of a month that the amount due, together with any interest, remains unpaid.

(2) Negligence. An insurer that fails to pay an amount due, or file a statement required, under s. 601.93(2), unless the insurer shows that the failure is due to reasonable cause and not due to willful neglect, is liable for the greater of the following amounts: