(a)    Each taxpayer shall, whether or not a tax be due thereon, make and file a return on or before April 30, of the year following the effective date of this chapter and on or before April 30, of each year thereafter. When the return is made for a fiscal year or other period different from the calendar year, the return shall be filed within four months from the end of that fiscal year or period.
   (b)    The return shall be filed with the administrator on forms furnished by or obtainable upon request from the administrator, setting forth:
      (1)    The aggregate amounts of salaries, wages, commissions, and other compensation earned, and gross income from businesses, professions, or other activities, less allowable expense incurred in the acquisition of the gross income earned during the preceding year and subject to the tax;
      (2)    The amount of the tax imposed by the section on the earnings and profits; and
      (3)    Such other pertinent statements, information returns, or other information as the administrator may require.
   (c)    The administrator may extend the time for filing of the annual return upon the request of the taxpayer, for a period of not to exceed six months, or one month beyond any extension requested of or granted by the Internal Revenue Service for the filing of the federal income tax return. The administrator may require as tentative return, accompanied by payment of the amount of tax shown to be due thereon by the date the return is due. No penalty or interest shall be assessed in those cases in which the return is filed and the final tax paid within the period as extended.
   (d)    (1)    Filing of consolidated returns may be permitted or required in accordance with rules and regulations prescribed by the administrator.
      (2)    In the case of a corporation that carried on transactions with its stockholders or with other corporations related by stock ownership, interlocking directorates, or some other method; or in case any person operates a division, branch, factory, office, laboratory, or activity within the Municipal limits constituting a portion only of its total business, the administrator shall require, such additional information as he may deem necessary to ascertain whether net profits are properly allocated to the Municipality. If the administrator finds that net profits are not properly allocated to the Municipality by reason of transactions with stockholders or with other corporations related by stock ownership, interlocking directorates, or transactions with the division, branch, factory, office, laboratory, or activity, or by some other method, he shall make the allocation as he deems appropriate to produce a fair and proper allocation of net profits to the Municipality.
   (e)    (1)    Where necessary, an amended return must be filed in order to report additional income and pay any additional tax due, or claim a refund of tax overpaid, subject to the requirements, limitations, or both, contained in Sections 181.10 and 181.11. The amended return shall be on a form obtainable on request from the administrator. A taxpayer may not change the method of accounting or apportionment of net profits after the due date for filing the original return.
      (2)    Within three months from the final determination of any federal tax liability affecting the taxpayer's Municipal tax liability, the taxpayer shall make and file an amended Municipal return showing income subject to the Municipal tax based upon the final determination of federal tax liability, and pay any additional tax shown due thereon or make claim for refund of any overpayment.
         (Ord. 1967-02. Passed 5-17-67.)