Wisconsin Statutes Taxation (Ch. 70 to 79) § 78.22. Motor vehicle fuel floor tax

(1) Floor tax imposed. On the date any motor vehicle fuel tax rate change becomes effective under s. 78.01, a floor tax is hereby imposed upon every person who is in possession of any motor vehicle fuel held for sale or resale and on which the motor vehicle fuel tax already has been imposed. The person shall determine the volume of motor vehicle fuel and shall file by the 15th day of the month in which the new tax rate becomes effective a return, together with any tax due on it, determined in accordance with sub. (2).

(2) Floor tax or refund computation. The amount of any motor vehicle fuel floor tax or refund shall be computed by multiplying the number of gallons of motor vehicle fuel held in inventory as determined under sub. (1) by the difference between the tax rate already paid and the new tax rate, and the resulting figure shall be expressed in dollars.

(3) Administration.Sections 71.74(1), (2), (10), (11), (13) and (14), 71.75(4) to (7), 71.82(2)(a) and (b), 71.83(2)(b)3., 71.88(1)(a) and (2)(a), 71.89 to 71.91, 71.92, 73.01 and 73.015 apply to the administration of this section.

(4) Late filing fee. Any person who fails to file a motor vehicle fuel floor tax return when due shall pay a late filing fee of $10. A return that is mailed is filed in time if it is mailed in a properly addressed envelope with postage duly prepaid and the envelope is officially postmarked, or marked or recorded electronically as provided under section 7502(f)(2)(c) of the Internal Revenue Code, on the date due and the return is actually received by the department or at the destination that the department prescribes within 5 days of the due date. A return that is not mailed is timely if it is received on or before the due date by the department or at the destination that the department prescribes. For purposes of this subsection, “mailed” includes delivery by a delivery service designated under section 7502(f) of the Internal Revenue Code.

(5) Delinquent interest. If the tax imposed in this section is not paid when due, interest at the rate of 1.5 percent per month accrues from the date the tax became due until paid.

(6) Penalty. If any person liable for the tax files a false or fraudulent return, there shall be added to the tax an amount equal to the tax the person evaded or attempted to evade.