105 ILCS 5/34-49
No contract shall be made or expense or liability incurred by the board, or any member or committee thereof, or by any person for or in its behalf, notwithstanding the expenditure may have been ordered by the board, unless an appropriation therefor has been previously made. Neither the board, nor any member or committee, officer, head of any department or bureau, or employee thereof 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 budget, in excess of the amounts appropriated in the budget. Any contract, verbal or written, made in violation of this Section is void as to the board, and no moneys belonging thereto shall be paid thereon. Provided, however, that the board may lease from any Public Building Commission created pursuant to the provisions of the Public Building Commission Act, approved July 5, 1955, as heretofore or hereafter amended, or from any individuals, partnerships or corporations, any real or personal property for the purpose of securing space for its school purposes or office or other space for its administrative functions for any period of time not exceeding 40 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 34-21.1 of this Act. Provided that the board may enter into agreements, including lease and lease purchase agreements having a term not longer than 40 years from the date on which such agreements are entered into, with individuals, partnerships, or corporations for the construction of school buildings, school administrative offices, site development, and school support facilities. The board shall maintain exclusive possession of all such schools, school administrative offices, and school facilities which it is occupying or acquiring pursuant to any such lease or lease purchase agreement, and in addition shall have and exercise complete control over the education program conducted at such schools, offices and facilities. The board's contribution under any such lease or lease purchase agreement shall be limited to the use of the real estate and existing improvements on a rental basis which shall be exempt from any form of leasehold tax or assessment, but the interests of the board may be subordinated to the interests of a mortgage holder or holders acquired as security for additional improvements made on the property. Provided that the board may enter into agreements, including lease and lease purchase agreements, having a term not longer than 40 years from the date on which such agreements are entered into for the provision of school buildings and related property and facilities for an agricultural science school pursuant to subparagraphs (8) through (10) of Section 34-21.1; and such agreements may be made and the obligations thereunder incurred without making a previous appropriation therefor. This Section does not prevent the making of lawful contracts for the construction of buildings, the purchase of insurance, the leasing of equipment, the purchase of personal property by a conditional sales agreement, or the leasing of personal property under an agreement that upon compliance with the terms of which the board shall become or has the option to become the owner of the property for no additional consideration or for a nominal consideration, the term of which may be for periods of more than 1 year, but, in no case, shall such conditional sales agreements or leases of personal property by which the board may or will become the owner of the personal property, provide for the consideration to be paid during a period of time in excess of 10 years nor shall such contracts provide for the payment of interest in excess of the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, on the unpaid balance owing; nor shall this Section prevent the making of lawful contracts for the purchase of fuel and the removal of ashes for a period from July 1 of any year to June 30 of the year following, or the making of lawful contracts for the transportation of pupils to and from school, or the entering into of employment contracts with individuals or groups of employees for any period not to exceed 4 years, or the entering into contracts with third parties for services otherwise performed by employees for any period not to exceed 5 years provided that the contracts with third parties for services provided at attendance centers shall specify that the principal of an attendance center shall have authority, to the maximum extent possible, to direct persons assigned to the attendance center pursuant to that contract, or the making of requirement contracts for not to exceed one year the terms of which may extend into the succeeding fiscal year provided, however, that such contracts contain a limitation on the amount to be expended and that such contracts shall impose no obligation on the board except pursuant to written purchase order.
With respect to instruments for the payment of money issued under this Section either before, on, or after the effective date of this amendatory Act of 1989, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Act that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Act that may appear to be or to have been more restrictive than those Acts.
105 ILCS 5/34-49