50 ILCS 420/3
The Notes shall bear interest at a rate or rates not to exceed that permitted in "An Act to authorize public corporations to issue bonds, other evidences of indebtedness and tax anticipation warrants subject to interest rate limitations set forth therein", approved May 26, 1970, as now or hereafter amended. Such notes shall mature within two years from the date issued. The Unit of Government shall be permitted to refund the Notes at or before the maturity date thereof if it reasonably appears that at such maturity date the taxes which have been pledged for the payment of the Notes have not been or will not be collected and received by the Unit of Government. The maturity date of the refunding Notes shall be the earliest date at which it is deemed possible to pay the Notes coming due. The Notes and the refunding Notes shall be the direct general obligations of the Unit of Government and shall so represent on the face thereof. The full faith and credit of the Unit of Government shall be pledged for the punctual payment of the principal of and interest on the Notes and on the refunding Notes.
50 ILCS 420/3