70 ILCS 810/29
All moneys received from the issuance of bonds as provided in Section 28 shall be set apart in the working cash fund by the district treasurer and shall be used only for the purposes and in the manner hereinafter provided.
Such fund and the monies therein shall not be regarded as assets available for appropriation and shall not be appropriated by the board in the resolution termed the annual appropriation bill. The board may appropriate moneys to the working cash fund up to the maximum amount allowable in the fund, and the working cash fund may receive such appropriations and any other contributions. In order to provide moneys with which to meet ordinary and necessary disbursements for salaries and other corporate purposes, such fund and the moneys therein may be transferred in whole or in part, to the general corporate fund of the district and so disbursed therefrom in anticipation of the collection of any taxes lawfully levied for general corporate purposes, or in the anticipation of such taxes, as by law now or hereafter enacted or amended, imposed by the General Assembly of the State of Illinois to replace revenue lost by units of local government and school districts as a result of the abolition of ad valorem personal property taxes, pursuant to Article IX, Section 5(c) of the Constitution of the State of Illinois. Moneys transferred to the general corporate fund in anticipation of the collection of taxes shall be deemed to have been transferred in anticipation of the collection of that part of the taxes so levied which is in excess of the amount or amounts thereof required to pay any tax anticipation warrants or general obligation tax anticipation notes and the interest thereon, theretofore or thereafter issued and the amount estimated to be required to satisfy debt service and pension or retirement obligations, as set forth in Section 12 of "An Act in relation to State revenue sharing with local government entities", approved July 31, 1969, as amended. Such taxes levied or to be received for general corporate purposes when collected, or received, shall be applied, first, to the payment of any such warrants or notes and the interest thereon, the amount estimated to be required to satisfy debt service and pension or retirement obligations as set forth in Section 12 of "An Act in relation to State revenue sharing with local government entities", approved July 31, 1969, as amended, and then to the reimbursement of said working cash fund as hereinafter provided. Upon receipt by the district treasurer of any taxes or other moneys, in anticipation of the collection or receipt whereof moneys of such working cash fund have been so transferred for disbursement, such fund shall be immediately reimbursed therefrom until the full amount so transferred has been re-transferred to such fund. Unless the taxes and other moneys so received and applied to the reimbursement of the working cash fund, prior to the close of the fiscal year following the fiscal year in which the last tax penalty date falls due shall be sufficient to effect a complete reimbursement of such fund for any moneys transferred therefrom in anticipation of the collection or receipt of such taxes or other moneys, such working cash fund shall be reimbursed for the amount of the deficiency therein from any other revenues accruing to said general corporate fund and it shall be the duty of the board to make provision for the immediate reimbursement of the amount of any such deficiency in its next resolution termed the annual appropriation bill.
70 ILCS 810/29