60 ILCS 1/145-15
The city council of the city whose territory is coextensive with the township shall provide for the collection of a direct annual tax sufficient to pay the interest on the debt as it falls due and also to pay and discharge the principal within 20 years from the time of contracting the debt. The amount of the tax shall be certified to the county clerk by the township clerk annually at the time required by law, shall be extended by the county clerk against the taxable property of the township as other taxes, and shall be collected at the same time and in the same manner as other taxes are collected. The tax, when collected, shall be held by the township collector as a fund out of which shall be paid the bonds and the interest on the bonds according to the tenor and effect of the bonds, upon the order of the supervisor and township clerk.
60 ILCS 1/145-15