Extensions.

In the case of a corporation required to file a return, the department of revenue shall allow an automatic extension of 7 months or until the original due date of the corporation’s corresponding federal return, whichever is later. Any extension of time granted by law or by the internal revenue service for the filing of corresponding federal returns shall extend the time for filing under this subchapter to 30 days after the federal due date if the corporation reports the extension in the manner specified by the department on the return. Except for payments of estimated taxes, income or franchise taxes payable upon the filing of the tax return shall not become delinquent during such extension period, but shall, except as provided in par. (b), be subject to interest at the rate of 12 percent per year during such period.

For taxable years beginning after December 31, 2008, for persons who qualify for a federal extension of time to file under 26 USC 7508A due to a presidentially declared disaster or terroristic or military action, income or franchise taxes payable upon the filing of the tax return are not subject to interest as otherwise provided under par. (a).