Iowa Code Title II. Elections and Official Duties [Chs. 39-79] § 74A.3. Interest rates for public obligations

a. General obligation bonds, warrants, or other evidences of indebtedness which are payable from general taxation or from the state's sinking fund for public deposits may bear interest at a rate to be set by the issuing governmental body or agency.

b. Revenue bonds, warrants, pledge orders or other obligations, the principal and interest of which are to be paid solely from the revenue derived from the operations of the publicly owned enterprise or utility for which the bonds or obligations are issued, may bear interest at a rate to be set by the issuing governmental body or agency.

c. Special assessment bonds, certificates, warrants or other obligations, the principal and interest of which are payable from special assessments levied against benefited property may bear interest at a rate to be set by the issuing governmental body or agency.