Wis. Stat. § 71.24 — Filing returns; extensions; payment of tax

71.24(1) (1) Filing returns. Every corporation, except a corporation all of whose income is exempt from taxation and except as provided in sub. (1m) , shall furnish to the department a true and accurate statement, on or before the date on which the corporation is required to file for federal income tax purposes, not including any extension, under the Internal Revenue Code, in the manner and form and setting forth the facts the department deems necessary to enforce this chapter. Every corporation that is required to furnish a statement under this subsection and that has income that is not taxable under this subchapter shall include with the corporation’s statement a report that identifies each item of the corporation’s nontaxable income. The statement shall be subscribed by the president, vice president, treasurer, assistant treasurer, chief accounting officer, or any other officer duly authorized so to act. In the case of a return made for a corporation by a fiduciary, the fiduciary shall subscribe the return. The fact that an individual’s name is subscribed on the return shall be prima facie evidence that the individual is authorized to subscribe the return on behalf of the corporation.

71.24(1m) (1m) Unrelated business income statement. Every corporation subject to a tax on unrelated business income under s. 71.26 (1) (a) , if that corporation is required to file for federal income tax purposes, shall furnish to the department a true and accurate statement on or before the date on which the corporation is required to file for federal income tax purposes, not including any extension, under the Internal Revenue Code. The requirements about manner, form, and subscription under sub. (1) apply to statements under this subsection.

71.24(2) (2) Copies of federal return. Each corporation that is required to file a return under this section shall file with that return a copy of its federal income tax return for the same taxable year.

71.24(3) (3) Inactive corporations. Whenever a corporation has been completely inactive for an entire taxable year, in lieu of filing the statements and information otherwise required by this section, it may file a declaration, on a form to be provided by the department, subscribed by its president, if a resident of this state, and, if not a resident, then by another officer residing in this state, attesting to such inactivity. Such declaration must be filed prior to the otherwise due date for its Wisconsin return for such taxable year. Thereafter the corporation need not file such statements or information for any subsequent year unless specifically requested to do so by the department or unless in a subsequent year the corporation has been activated or reactivated.

71.24(4) (4) Filing returns by receiver, trustee in bankruptcy or assignee. If a receiver, trustee in bankruptcy or assignee, by order of a court, by operation of law or otherwise, has possession of all or substantially all of the property or business of a corporation, whether or not such property or business is being operated, such receiver, trustee or assignee shall make the return of income for such corporation in the manner and form that corporations are required to make such returns.

71.24(5) (5) Department may require filing. Nothing contained in this section shall preclude the department from requiring any corporation to file a return when in the judgment of the department a return should be filed.

71.24(6) (6) Changing reporting period.

71.24(6)(a) (a) Corporations may not change their basis of reporting from a calendar year to a fiscal year, from a fiscal year to a calendar year, or from one fiscal year to another without first obtaining the approval of the department of revenue unless the internal revenue service has approved the change or unless the change, including a change to a short taxable year, is required by the internal revenue code before approval by the internal revenue service and the reason for the change is explained in the first return filed for the new taxable year. Corporations that make changes on the basis of federal changes shall submit a copy of the internal revenue service’s notice of approval, if prior federal approval, other than expeditious approval, was required, or requirement, if prior federal approval was not required or if the corporation qualifies for expeditious approval, to the department of revenue along with the return for the first taxable year for which the change applies.

71.24(6)(b) (b) If a corporation changes its basis of reporting from a calendar year to a fiscal year a separate return shall be made for the period between the close of the last calendar year and the date designated as the close of the fiscal year. If the change is from a fiscal year to a calendar year, a separate return shall be made for the period between the close of the last fiscal year and the following December 31. If the change is from one fiscal year to another fiscal year a separate return shall be made for the period between the close of the former fiscal year and the date designated as the close of the new fiscal year. In no case shall a separate income or franchise tax return be made for a period of more than 12 months.

71.24(6)(c) (c) If a separate corporation income tax return is made for a fractional part of a year for federal income tax purposes, the corporation shall file a separate Wisconsin income or franchise tax return for that fractional year. The income shall be computed and reported on the basis of the period for which the separate return is made, and that fractional part of a year shall constitute a taxable year, except that if a corporation terminates, under section 1362 (d) (1) or (2) of the internal revenue code, its election to be treated as an S corporation for federal income tax purposes the corporation may allocate its items of income, loss or deduction between its short taxable year as a tax-option corporation and its short taxable year as a nontax-option corporation according to the method under section 1362 (e) (2) of the internal revenue code.

71.24(6)(d) (d) If a separate income [or franchise] tax return is made for a short period under par. (b) on account of a change in the taxable year, the net income for such short period shall be placed on an annual basis using the method applicable for federal income taxes under section 443 (b) (1) of the internal revenue code.

71.24(7) (7) Extensions.

71.24(7)(a) (a) 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.

71.24(7)(b) (b) 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) .

71.24(9) (9) Delinquencies.

71.24(9)(a) (a) Corporation franchise and income taxes not paid on or before the deadline for filing returns described in sub. (1) or (1m) shall be deemed delinquent.

71.24(9)(b) (b) Additional income or franchise taxes assessed under s. 71.74 (1) to (5) , (7) and (8) shall become delinquent if not paid on or before the due date stated in the notice to the taxpayer.

71.24(10) (10) Advance payments. The department of revenue shall accept in advance income or franchise taxes and surtaxes from taxpayers desirous of making such payments before the same shall become due and payable. Advance payment of taxes under this subsection shall not relieve the taxpayer from additional taxes which may result from subsequent legislation or from additional taxable income disclosed or discovered subsequent to such payment.

71.24(11) (11) Small balances. No person is required to pay a balance due of less than $1.