Wis. Stat. § 194.51
No suit shall be maintained in any court to restrain or delay the collection or payment of the taxes levied in this chapter. The aggrieved taxpayer shall pay the tax as and when due, and, if paid under protest, may at any time within 90 days from the date of such payment, sue the state in an action at law to recover the tax so paid. If it is finally determined that said tax, or any part thereof, was wrongfully collected for any reason, it shall be the duty of the secretary of administration to pay out of the transportation fund the amount of such tax so adjudged to have been wrongfully collected. A separate suit need not be filed for each separate payment made by any taxpayer, but a recovery may be had in one suit for as many payments as may have been made within any 90-day period preceding the commencement of such an action. Such suits shall be commenced as provided in s. 775.01.
Wis. Stat. § 194.51