Delinquent.

The department shall provide by rule for reduction of interest under par. (a) to 12 percent per year in stated instances wherein the secretary of revenue determines that reduction is fair and equitable.

Any assessment made as a result of the disallowance of a claim for credit made under s. 71.07, 71.28 or 71.47 or subch. VIII or IX with fraudulent intent, or of a portion of a claim made under said subchapters or sections that was excessive and was negligently prepared, shall bear interest from the due date of the claim, until refunded or paid, at the rate of 1.5 percent per month.

Of the amounts required to be withheld any amount not deposited or paid over to the department within the time required shall be deemed delinquent and deposit reports or withholding reports filed after the due date shall be deemed late. Delinquent deposits or payments shall bear interest at the rate of 1.5 percent per month from the date deposits or payments are required under this section until deposited or paid over to the department. The department shall provide by rule for reduction of interest on delinquent deposits to 12 percent per year in stated instances wherein the secretary of revenue determines reduction fair and equitable. In the case of a timely filed deposit or withholding report, withheld taxes shall become delinquent if not deposited or paid over on or before the due date of the report. In the case of no report filed or a report filed late, withheld taxes shall become delinquent if not deposited or paid over by the due date of the report. In the case of an assessment under s. 71.83 (1) (b) 2., the amount assessed shall become delinquent if not paid on or before the first day of the calendar month following the calendar month in which the assessment becomes final, but if the assessment is contested before the tax appeals commission or in the courts, it shall become delinquent on the 30th day following the date on which the order or judgment representing final determination becomes final.