(1) Every partnership shall furnish to the department a true and accurate statement, on or before April 15 of each year, except that returns for fiscal years ending on some other date than December 31 shall be furnished on or before the 15th day of the 4th month following the close of such fiscal year, in such manner and form and setting forth such facts as the department deems necessary to enforce this chapter. A partnership that is the owner of a single-owner entity that is disregarded as a separate entity under section 7701 of the Internal Revenue Code shall include that entity's information on the owner's return under this subchapter. The statement shall be subscribed by one of the members of the partnership.
(2) Nothing in this section precludes the department of revenue from requiring any person other than a corporation to file an income tax return when in the judgment of the department a return should be filed.