55 ILCS 5/6-24008
After the adoption of such appropriation bill or resolution, the said board of commissioners shall not make any further or other appropriations prior to the adoption or passage of the next succeeding annual appropriation bill, and the said board of commissioners shall have no power, either directly or indirectly, to make any contract or to do any act which shall add to the county expenditure or liabilities in any year, anything or sum over and above the amount provided for in the annual appropriation bill for that fiscal year. No contract shall hereafter be made, or expense or liability incurred by the said board of commissioners, or any member or committee thereof, or by any person or persons, for or in its behalf, notwithstanding the expenditure may have been ordered by the said board of commissioners, unless an appropriation therefor shall have been previously made by said board in manner aforesaid. Neither said board, nor any member or committee thereof, nor any officer of the county, nor any person holding any office, trust or employment under such board of commissioners of such county, shall, during a fiscal year, expend or contract to be expended any money, or incur any liability, or enter into any contract which, by its terms, involves the expenditure of money for any of the purposes for which provision is made in the annual appropriation bill in excess of the amounts appropriated in said appropriation bill. Provided, however, that the board of commissioners may lease from any Public Building Commission created pursuant to the provisions of the Public Building Commission Act, approved July 5, 1955, as now or hereafter amended, any real or personal property for county purposes for any period of time not exceeding 20 years, and such lease may be made and the obligation or expense thereunder incurred without making a previous appropriation therefor except as otherwise provided in Section 5-1108. Any contract, verbal or written, made in violation of this Section shall be null and void as to said county, and no moneys belonging to that county shall be paid thereon; provided, however, that nothing herein contained shall prevent the making of lawful contracts for the construction of buildings, the term of which contracts may be for periods of more than one year. Provided, however, that nothing herein contained shall prevent the board of commissioners, by a concurring vote of four-fifths of all the commissioners (said vote to be taken by yeas and nays and entered upon the journal), for making any expenditure or incurring any liability rendered necessary, by any unforeseen casualty by fire, flood or otherwise, happening after the annual appropriation bill shall have been passed or adopted. Nor shall anything herein contained be construed to deprive the board of power to provide for and cause to be paid from the county funds any charge upon said county imposed by law, without the action of the board of commissioners, including fixed salaries of officers or employees required by law to be paid from the county treasury, and to pay jurors' fees and other charges fixed by law.
Notwithstanding the foregoing provisions of this Section or Section 6-24001, the board of commissioners may, during the fiscal year 1969, adopt a supplemental appropriation bill or resolution in an amount not in excess of any additional revenue available to the county, or estimated to be received by the county, subsequent to the adoption of the annual appropriation bill or resolution for that fiscal year, for any proper corporate purpose. Such supplemental appropriation bill or resolution shall only affect revenue that was not available for appropriation when the annual appropriation bill or resolution was adopted, and the provisions of Section 6-24004 relating to publication, notice and public hearing shall not be applicable to such supplemental appropriation bill or resolution or to the budget document forming the basis thereof.
55 ILCS 5/6-24008