Idaho Code § 50-1762
Any municipal corporation, including chartered municipal corporations, may by general ordinance of appropriation or by levy of a tax of not to exceed two hundredths percent (.02%) of the market value for assessment purposes on all taxable property within the municipal corporation in any one (1) year, or by appropriation from such other sources as may be determined by the council, create a fund for the purpose of guaranteeing to the extent of such fund, the payment of bonds or warrants and interest thereon, hereafter issued against any local improvements therein; provided, that such sum so levied or appropriated in any year shall be more than sufficient to pay the outstanding warrants of said fund and to establish therein a balance, which combined levy and appropriation in any one (1) year shall not exceed five percent (5%) of the outstanding obligations thereby guaranteed; provided, further, that the council shall not levy any tax as herein provided when the amount of moneys in the "Local Improvement Guarantee Fund" equals ten percent (10%) of the total outstanding obligations thereby guaranteed. The tax levies herein authorized and directed shall be additional to and, if need be, in excess of any and all statutory and charter limitations. The fund so created shall be designated "Local Improvement Guarantee Fund."
Idaho Code § 50-1762