Idaho Code § 50-1004
At the time of passing the annual appropriation ordinance, said city councils, unless provision shall have been made as provided by law for the funding, refunding, purchase, redemption or exchange of the outstanding city warrant indebtedness, must, whenever any city shall have warrants outstanding and unpaid, for the payment of which there are no funds in the city treasury, in addition to other taxes provided by law, if such warrants amount to a sum equal to five per cent (5%) or more of the value of the taxable property of such city, levy and include a special tax assessment of not to exceed two tenths per cent (.2%) of market value for assessment purposes in such annual appropriation bill; if such warrants amount to a sum equal to four per cent (4%) and less than five per cent (5%) of such taxable property, they must levy and include a special tax or assessment of not to exceed sixteen hundredths per cent (.16%) of market value for assessment purposes in such annual appropriation bill; if such warrants amount to a sum equal to three per cent (3%) and less than four per cent (4%) of such taxable property, they must levy and include a special tax or assessment of not to exceed twelve hundredths per cent (.12%) of market value for assessment purposes in such annual appropriation bill; if such warrants amount to a sum equal to two per cent (2%) and less than three per cent (3%) of such taxable property, they must levy and include a special tax or assessment of not to exceed eight hundredths per cent (.08%) of market value for assessment purposes in such annual appropriation bill; and if such warrants amount to one per cent (1%) and less than two per cent (2%) of such taxable property they must levy and include a special tax or assessment of not to exceed four hundredths per cent (.04%) of market value for assessment purposes in such annual appropriation bill; and if such warrants amount to less than one per cent (1%) of such taxable property, then they must levy and include such special tax or assessment on the dollar in such annual appropriation bill as shall be sufficient to pay such warrants.
All moneys arising from such special tax or assessment shall be placed in a special fund to be known as the "Warrant Redemption Fund" and the redemption of such warrants shall be paid exclusively from this fund.
All moneys in the city treasury at the end of each fiscal year not needed for that year's expenses and applicable thereto, and not subject to the provisions of section 50-1005A, Idaho Code, shall be transferred to said "Warrant Redemption Fund," if such there be.
Idaho Code § 50-1004