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Except as provided in subd. 7., if the credit computed under par. (b) is not entirely offset against Wisconsin income or franchise taxes otherwise due, the unused balance shall be carried forward and credited against Wisconsin income or franchise taxes otherwise due for the following 20 taxable years to the extent not offset by these taxes otherwise due in all intervening years between the year in which the expense was incurred and the year in which the carry-forward credit is claimed.
For shareholders in a tax-option corporation, the credit may be offset only against the tax imposed on the shareholder’s prorated share of the tax-option corporation’s income.
For partners, the credit may be offset only against the tax imposed on the partner’s distributive share of partnership income.
If a tax-option corporation becomes liable for tax for a taxable year that begins on or after January 1, 1998, the corporation may offset the credit against the tax due, with any remaining credit computed for a taxable year that begins on or after January 1, 1998, passing through to the shareholders.
If a corporation that is not a tax-option corporation has a carry-over credit from a taxable year that begins on or after January 1, 1998, and becomes a tax-option corporation before the credit carried over is used, the unused portion of the credit may be used by the tax-option corporation’s shareholders on a prorated basis.
If the shareholders of a tax-option corporation have carry-over credits and the corporation becomes a corporation other than a tax-option corporation after October 14, 1997, and before the credits carried over are used, the unused portion of the credits may be used by the corporation that is not a tax-option corporation.
No credit may be claimed under this subsection for taxable years that begin after December 31, 2005. For credits that are claimed but unused under this subsection for taxable years that begin before January 1, 2006, up to 50 percent may be used in each of the following 2 taxable years if the taxpayer has $25,000 or less in unused credits as of January 1, 2006. For taxable years beginning after December 31, 2005, and before January 1, 2008, a taxpayer who has more than $25,000 in unused credits as of January 1, 2006, may deduct an amount in each year that is equal to 50 percent of the amount the taxpayer added back to income under s. 71.26 (2) (a) at the time that the taxpayer first claimed the credit or, with regard to credits passed through from a partnership, limited liability company, or tax-option corporation, 50 percent of the amount that the entity added back to its income and was included in the partner’s, member’s, or shareholder’s Wisconsin net income at the time that the credit was first claimed.