The proceeds of Bonds may be used to provide for the payment of interest upon such Bonds for a period not to exceed the greater of 2 years or a period ending 6 months after the estimated date of completion of the acquisition and construction of the project or accomplishment of the purpose for which such Bonds are issued.
In addition it shall be lawful for the corporate authorities of any municipality issuing Bonds to appropriate money for the purpose of paying interest on such Bonds during the period described above. Such appropriation may be made in the ordinance authorizing such Bonds and shall be fully effective upon the effective date of such ordinance without any further notice, publication or approval whatsoever.
65 ILCS 5/8-4.1-7