On or before the first Monday of September of each year, the board of commissioners for the municipality comprising two or more supervisors districts of adjacent counties shall meet and levy a tax sufficient upon the taxable property of the territory to provide funds for the payment of interest on bonds and the payment of bonds maturing within one year, and to provide a sinking fund for the redemption of any outstanding bond and shall certify such levy to the boards of supervisors of each of the counties affected, prior to the date on which county tax levies are fixed, and it shall be the duty of the respective boards of supervisors to levy the tax prescribed by the board of commissioners of the municipality upon the taxable property of the territory of the county which is embraced in the municipality. The tax collector of each county shall thereupon collect such tax in the same manner and at the same time as other taxes are collected and shall transmit the proceeds thereof to the proper depositories.