30 ILCS 330/20
A separate fund in the State treasury called the "General Obligation Bond Rebate Fund" is hereby created. The State Treasurer is hereby authorized to create such separate accounts within the General Obligation Bond Rebate Fund from time to time in connection with the issuance of Bonds pursuant to this Act and to transfer moneys to the General Obligation Bond Rebate Fund from the Funds described in subsection (a) of Section 19 of this Act at such times and in such amounts as shall be deemed necessary to preserve the exclusion of the interest earned by the owners of Bonds issued under this Act from the federal gross income of such owners. This Act shall constitute an irrevocable and continuing appropriation of all amounts necessary for the purpose described in this Section.
30 ILCS 330/20