(a) On or before the last day of each month, each taxpayer who has not paid the tax imposed by this Article IX to a person delivering electricity as set forth in Section 21-62, and who is not otherwise exempted from paying such tax, shall make a return to the Village Treasurer for the preceding month stating:
(1) Name.
(2) Principal place of business.
(3) Gross receipts and/or kilowatt-hour usage during the month upon the basis of which the tax is imposed.
(4) Amount of tax.
(5) Such other reasonable and related information as the Village Treasurer may require.
(b) The taxpayer making the return herein provided for shall, at the time of making such return, pay to the Village of Downers Grove, the amount of tax herein imposed. Provided, in connection with any return, the taxpayer may, if he so elects, report and pay an amount based upon his/her total billings of business subject to the tax during the period for which the return is made (exclusive of any amounts previously billed) with prompt adjustments of later payments based upon any differences between such billings, and the taxable gross receipts.