(a) The taxpayer making a return shall, at the time of filing thereof pay to the Administrator the amount of taxes shown as due thereon; provided, however, that where any portion of the tax so due shall have been deducted at the source pursuant to the provisions of Section 181.17 thereof, or where any portion of said tax shall have been paid by the taxpayer pursuant to the provisions of Section 181.18 hereof, or whether an income tax has been paid to another municipality credit for the amount so paid in accordance with Section 181.27 hereof, shall be deducted from the amount shown to be due and only the balance, if any, shall be due and payable at the time of filing said return.
(b) A taxpayer who has overpaid the amount of tax to which the City is entitled under the provisions of this chapter may have such overpayment applied against any subsequent liability hereunder or, at his election, indicating on the return, such overpayment (or part thereof) shall be refunded, providing that no additional taxes or refunds of less than $1.00 shall be collected or refunded. (1969 Code 92.20)