65 ILCS 5/9-3-49
Any municipality levying assessments as provided in this Division 3 may provide by ordinance for the levy, in addition to the taxes now authorized by law, and in addition to the amount authorized to be levied for general corporate purposes, a tax not exceeding .05% of all taxable property in such municipality to be known as a public benefit tax for the purpose of paying public benefits levied in accordance with the provisions of this Division 3. The fund arising therefrom shall be known as a public benefit fund, which fund shall be kept separate and apart from all other funds and shall be used solely for the purpose of paying that portion of the several amounts assessed against any such municipality for public benefit. However, such municipality shall not extend a tax for the payment of such public benefit in excess of the amount required annually to pay the principal and interest of the installments of such public benefit as it matures.
65 ILCS 5/9-3-49