105 ILCS 5/34-25
Any board holding in its treasury any fund set aside for use for some particular purpose that is not immediately necessary for such purpose may by resolution adopted by a vote of a majority of the full membership of the board use the money in such fund, or in the aggregate of such funds if there may be more than one, in the purchase of tax anticipation warrants of the board ordered issued by the city council of such city at the request of said board of education. Such warrants shall bear interest not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract. All interest on such warrants and all moneys paid in redemption or received from the resale thereof shall at once be credited to and placed in such fund so held by the board. No board, however, so using any of its own funds for the purchase of tax anticipation warrants shall apply to the payment thereof while so held by it any taxes against and in anticipation of which such warrants have been issued, unless and until all warrants and the interest thereon, issued by the board against and in anticipation of the same taxes and sold to other purchasers at public or private sale, and all bonds, together with interest thereon, issued pursuant to the provisions of this Act, have been first paid or moneys sufficient for the payment thereof have been deposited with the treasurer of the board as a special fund to be held and used solely for the purpose of paying such warrants and bonds with interest thereon when presented. This section does not prevent the resale or reissue of any warrants as provided in Section 34-26.
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 5/34-25