Section 60 ILCS 1/280-30 - Sinking fund(a) Money that becomes available from taxes that were levied for prior years for payment of bonds or interest coupons that were paid or refunded before those taxes were collected, after payment of all warrants that may have been issued in anticipation of these taxes, shall be placed in the sinking fund account provided in this Section. The account shall be used to purchase, call for payment, or pay at maturity refunding bonds and interest on those bonds as provided in this Section.(b) Money received from the proceeds of taxes levied for the payment of the principal of and interest upon refunding bonds shall be deposited in a special fund of the township designated as the Refunding Bond and Interest Sinking Fund Account of (name of township). This fund shall be faithfully applied to the purchase or payment of refunding bonds and the interest on those bonds under this Article.(c) If the money in the sinking fund is not immediately necessary for the payment of refunding bonds or if refunding bonds cannot be purchased before maturity, then, under the direction of the corporate authorities of the township, the money may be invested by the treasurer of the township in bonds or other interest bearing obligations of the United States or in bonds of the State of Illinois.(d) The maturity date of the securities in which the money in the sinking fund is invested shall be before the due date of any issue of refunding bonds of the investing township. The corporate authorities may sell these securities whenever necessary to obtain cash to meet bond and interest payments.Laws 1941, vol. 2, p. 489; P.A. 88-62.