It is not intended that the tax imposed by Section 789.02 shall be in addition to any seat mileage or motor vehicle license tax paid to the City by a holder of a certificate of convenience operating motor vehicles for the transportation of passengers pursuant to any State law. Any holder of such certificate shall be credited upon any amount due under Section 789.02 to the extent and to the amount the City receives payment from such certificate holder of any such seat mileage and motor vehicle tax during any twelve months' taxable period.
(1961 Code Sec. 789.06.)