Wis. Stat. § 71.76

(1) If for any year the amount of federal net income tax payable, of a credit claimed or carried forward, of a net operating loss carried forward or of a capital loss carried forward of any taxpayer as reported to the internal revenue service is changed or corrected by the internal revenue service or other officer of the United States, such taxpayer shall report such changes or corrections to the department within 180 days after its final determination and shall concede the accuracy of such determination or state how the determination is erroneous. Such changes or corrections need not be reported unless they affect the amount of net tax payable under this chapter, of a credit calculated under this chapter, of a Wisconsin net operating loss carried forward, of a Wisconsin net business loss carried forward or of a capital loss carried forward under this chapter. Any taxpayer submitting an amended return to the internal revenue service, or to another state if there has been allowed a credit against Wisconsin taxes for taxes paid to that state, shall also file, within 180 days of such filing date, an amended return if any information contained on the amended return affects the amount of net tax payable under this chapter of a credit calculated under this chapter, of a Wisconsin net operating loss carried forward, of a Wisconsin net business loss carried forward or of a capital loss carried forward under this chapter.

(2)

(a) Except as approved in par. (b) , in the case of any partnership adjustments, as defined under section 6241 of the Internal Revenue Code and including adjustments under section 6225 of the Internal Revenue Code, the partnership and its partners shall report such changes or corrections to the department within 180 days after the final determination by the internal revenue service and shall concede the accuracy of such determination or state how the determination is erroneous. The partnership and its partners are not required to report such changes or corrections unless the changes or corrections affect the amount of net tax payable under this chapter, of a credit calculated under this chapter, of a Wisconsin net operating loss carried forward under this chapter, of a Wisconsin net business loss carried forward under this chapter, or of a capital loss carried forward under this chapter. The partnership and its partners shall submit amended returns, as applicable, for each reviewed year, as defined under section 6225 of the Internal Revenue Code, to which such partnership adjustments relate.

(b) In the case of any partnership adjustments, as defined under section 6241 of the Internal Revenue Code and including adjustments under section 6225 of the Internal Revenue Code, the partnership may submit a request to the department, in a manner prescribed by the department, within 60 days after the final determination by the internal revenue service to amend the partnership returns and pay tax on behalf of the partners at the highest tax rate computed under s. 71.745 (2) (a) for each reviewed year, as defined under section 6225 of the Internal Revenue Code, to which such partnership adjustments relate. The partnership and its partners shall report such changes or corrections to the department within 180 days after the receipt of the notice of approval from the department and shall concede the accuracy of such determination or state how the determination is erroneous. The partnership and its partners shall report changes and corrections as provided under par. (a) within 180 days after the receipt of the notice of denial from the department
t such changes or corrections to the department within 180 days after the receipt of the notice of approval from the department and shall concede the accuracy of such determination or state how the determination is erroneous. The partnership and its partners shall report changes and corrections as provided under par. (a) within 180 days after the receipt of the notice of denial from the department. The partnership and its partners are not required to report such changes or corrections unless the changes or corrections affect the amount of net tax payable under this chapter, of a credit calculated under this chapter, of a Wisconsin net operating loss carried forward under this chapter, of a Wisconsin net business loss carried forward under this chapter, or of a capital loss carried forward under this chapter.

History: 1987 a. 312 ; 1991 a. 39 ; 1997 a. 27 ; 2021 a. 1 , 262 ; 2025 a. 127 , 129 .