§ 63-208 — RULES PERTAINING TO MARKET VALUE — DUTY OF ASSESSORS

(1) It shall be the duty of the state tax commission to prepare and distribute to each county assessor and the county commissioners within the state of Idaho rules prescribing and directing the manner in which market value for assessment purposes is to be determined for the purpose of taxation. The rules promulgated by the state tax commission shall require each assessor to find market value for assessment purposes of all property, except that expressly exempt under chapter 6, title 63, Idaho Code, within his county according to recognized appraisal methods and techniques as set forth by the state tax commission; provided, that the actual and functional use shall be a major consideration when determining market value for assessment purposes. The recognized appraisal methods shall, at a minimum, require the assessment of such property to reflect, within reasonable statistical certainty, the median ratio of assessed value to market value for the categories of property being tested within a range of ninety percent (90%) to one hundred ten percent (110%) of market value, using statistical methods such as confidence intervals to determine compliance and requiring corrective actions if the ratio falls outside of this range. Each category of property tested shall also have a level of assessment that is provable with reasonable statistical certainty to be not more than five (5) percentage points different than that of each other category of property tested.
(2) To maximize uniformity and equity in assessment of different categories of property, such rules shall, to the extent practical, require the use of reproduction or replacement cost less depreciation as opposed to historic cost less depreciation whenever cost is considered as a single or one (1) of several factors in establishing the market value of depreciable property. The state tax commission shall also prepare and distribute amendments and changes to the rules as shall be necessary in order to carry out the intent and purposes of this title. The rules shall be in the form as the commission shall direct, and shall be made available upon request to other public officers and the general public in reasonable quantities without charge. In ascertaining the market value for assessment purposes of any item of property, the assessor of each county shall, and is required to, abide by, adhere to and conform with rules promulgated by the state tax commission.
(3) When establishing the real property market value for assessment purposes of income-producing property, the assessor may use one (1) or more market valuation methods, provided that the market value shall not include contract rent related to the real estate only and shall exclude any value of exempt intangible personal property as provided in section 63-602L, Idaho Code. Upon request by the property owner, the assessor shall provide the property owner with the assessor’s calculations used to derive the income-producing property owner’s market value, including any value exempted by statute.

Legislative History

[63-208 added 1996, ch. 98, sec. 3, p. 322; am. 2023, ch. 285, sec. 1, p. 870; am. 2025, ch. 202, sec. 1, p. 916; am. 2025, ch. 313, sec. 1, p. 1316.]