Idaho Code § 63-3106
A taxing district shall have power to issue refunding bonds or notes, with like limitations upon interest and maturity, and shall issue refunding bonds or notes where such refunding bonds or notes shall be necessary to provide for the payment of any revenue anticipation bonds or notes at maturity, or to provide for the payment of any revenue anticipation notes or bonds heretofore issued by any taxing district where such revenue anticipation notes or bonds are outstanding and unpaid after their maturity date. Said refunding bonds or notes shall be authorized by resolution and shall be issued, sold and paid as herein provided for the issuance, sale and payment of revenue anticipation bonds or notes. At no time shall the total amount outstanding of such revenue anticipation bonds or notes and such refunding bonds or notes exceed seventy-five per cent (75%) of the amount of taxes levied or state funds or other revenues anticipated for the current fiscal year and not yet collected by said taxing district, or if such refunding bonds or notes are issued before the tax levy or budget for any fiscal year has been completed, then the total amount outstanding of such revenue anticipation bonds or notes and such refunding bonds or notes shall not exceed seventy-five per cent (75%) of the amount of taxes levied or state funds or other revenues received by said taxing district in the previous fiscal year; provided that where refunding bonds or notes have been issued or the issuance thereof has been provided for by the adoption of a resolution for the purpose of refunding any revenue anticipation bonds or notes, the said revenue anticipation bonds or notes to be refunded by said refunding bonds or notes shall not be included in determining the total amount of revenue anticipation bonds and notes outstanding, but for that purpose shall be treated as having been refunded and retired by such refunding bonds or notes.
Idaho Code § 63-3106