Idaho Code § 40-805
It is the duty of the tax collector of the county to pay over to the treasurer of the highway district all district tax moneys collected by him and payable to the district as soon as they are collected, and on or before the third Monday in July in each year make a final settlement with the district treasurer respecting the district taxes and pay over all moneys then due to the district, including all the district's proportionate amount of delinquent district taxes, interest and costs on all tax sales and redemptions from them. The treasurer of the district shall give to the tax collector of the county duplicate receipts for the payments, and the tax collector shall give one to the secretary of the district and the other shall be an acquittance to the county tax collector in settling with the highway district, to the extent of the payment shown.
Idaho Code § 40-805