Co. Const. art. X, § 3 — Article X / Section 3
CO Const., Article X, Section 3
Status: in_force

Uniform taxation - exemptions. (1) (a) Each property tax levy shall be uniform upon all real and personal property not exempt from taxation under this article located within the territorial limits of the authority levying the tax. The actual value of all real and personal property not exempt from taxation under this article shall be determined under general laws, which shall prescribe such methods and regulations as shall secure just and equalized valuations for assessments of all real and personal property not exempt from taxation under this article. Valuations for assessment shall be based on appraisals by assessing officers to determine the actual value of property in accordance with provisions of law, which laws shall provide that actual value be determined by appropriate consideration of cost approach, market approach, and income approach to appraisal. However, the actual value of residential real property shall be determined solely by consideration of cost approach and market approach to appraisal; and, however, the actual value of agricultural lands, as defined by law, shall be determined solely by consideration of the earning or productive capacity of such lands capitalized at a rate as prescribed by law. (b) Residential real property, which shall include all residential dwelling units and the land, as defined by law, on which such units are located, and mobile home parks, but shall not include hotels and motels, shall be valued for assessment at twenty-one percent of its actual value. For the property tax year commencing January 1, 1985, the general assembly shall determine the percentage of the aggregate statewide valuation for assessment which is attributable to residential real property. For each subsequent year, the general assembly shall again determine the percentage of the aggregate statewide valuation for assessment which is attributable to each class of taxable property, after adding in the increased valuation for assessment attributable to new construction and to increased volume of mineral and oil and gas production. For each year in which there is a change in the level of value used in determining actual value, the general assembly shall adjust the ratio of valuation for assessment for residential real property which is set forth in this paragraph (b) as is necessary to insure that the percentage of the aggregate statewide valuation for assessment which is attributable to residential real property shall remain the same as it was in the year immediately preceding the ​ year in which such change occurs. Such adjusted ratio shall be the ratio of valuation for assessment for residential real property for those years for which such new level of value is used. In determining the adjustment to be made in the ratio of valuation for assessment for residential real property, the aggregate statewide valuation for assessment that is attributable to residential real property shall be calculated as if the full actual value of all owner-occupied primary residences that are partially exempt from taxation pursuant to section 3.5 of this article was subject to taxation. All other taxable property shall be valued for assessment at twenty-nine percent of its actual value. However, the valuation for assessment for producing mines, as defined by law, and lands or leaseholds producing oil or gas, as defined by law, shall be a portion of the actual annual or actual average annual production therefrom, based upon the value of the unprocessed material, according to procedures prescribed by law for different types of minerals. Non-producing unpatented mining claims, which are possessory interests in real property by virtue of leases from the United States of America, shall be exempt from property taxation. (c) The following classes of personal property, as defined by law, shall be exempt from property taxation: Household furnishings and personal effects which are not used for the production of income at any time; inventories of merchandise and materials and supplies which are held for consumption by a business or are held primarily for sale; livestock; agricultural and livestock products; and agricultural equipment which is used on the farm or ranch in the production of agricultural products. (d) Ditches, canals, and flumes owned and used by individuals or corporations for irrigating land owned by such individuals or corporations, or the individual members thereof, shall not be separately taxed so long as they shall be owned and used exclusively for such purposes. (2) (a) During each property tax year beginning with the property tax year which commences January 1, 1983, the general assembly shall cause a valuation for assessment study to be conducted. Such study shall determine whether or not the assessor of each county has complied with the property tax provisions of this constitution and of the statutes in valuing property and has determined the actual value and valuation for assessment of each and every class of taxable real and personal property consistent with such provisions. Such study shall sample at least one percent of each and every class of taxable real and personal property in the county. (b) (I) If the study conducted during the property tax year which commences January 1, 1983, shows that a county assessor did not comply with the property tax provisions of this constitution or the statutes or did not determine the actual value or the valuation for assessment of any class or classes of taxable real and personal property consistent with such provisions, the state board of equalization shall, during such year, order such county assessor to reappraise during the property tax year which commences January 1, 1984, such class or classes for such year. Such reappraisal shall be performed at the expense of the county. (II) If the study performed during the property tax year which commences January 1, 1984, shows that the county assessor failed to reappraise such class or classes as ordered or failed in his reappraisal to meet the objections of the state board of equalization, the state board of equalization shall cause a reappraisal of such class or classes to be performed in the property tax year which commences January 1, 1985. The cost of such reappraisal shall be paid by the state by an appropriation authorized by law. However, if such reappraisal shows that the county ​ assessor did not value or assess taxable property as prescribed by the provisions of this constitution or of the statutes, upon certification to the board of county commissioners by the state board of equalization of the cost thereof, the board of county commissioners shall pay to the state the cost of such reappraisal. (III) The reappraisal performed in the property tax year which commences January 1, 1985, shall become the county's abstract for assessment with regard to such reappraised class or classes for such year. The state board of equalization shall order the county's board of county commissioners to levy, and the board of county commissioners shall levy, in 1985 an additional property tax on all taxable property in the county in an amount sufficient to repay, and the board of county commissioners shall repay, the state for any excess payment made by the state to school districts within the county during the property tax year which commences January 1, 1985. (c) (I) Beginning with the property tax year which commences January 1, 1985, and applicable to each property tax year thereafter, the annual study conducted pursuant to paragraph (a) of this subsection (2) shall, in addition to the requirements set forth in paragraph (a) of this subsection (2), set forth the aggregate valuation for assessment of each county for the year in which the study is conducted. (II) If the valuation for assessment of a county as reflected in its abstract for assessment is more than five percent below the valuation for assessment for such county as determined by the study, during the next following year, the state board of equalization shall cause to be performed, at the expense of the county, a reappraisal of any class or classes of taxable property which the study shows were not appraised consistent with the property tax provisions of this constitution or the statutes. The state board of equalization shall cause to be performed during the next following year, at the expense of the county, a reappraisal of any class or classes of taxable property which the study shows were not appraised consistent with the property tax provisions of this constitution or the statutes even though the county's aggregate valuation for assessment as reflected in the county's abstract for assessment was not more than five percent below the county's aggregate valuation for assessment as determined by the study. The reappraisal shall become the county's valuation for assessment with regard to such reappraised class or classes for the year in which the reappraisal was performed. (III) In any case in which a reappraisal is ordered, state equalization payments to school districts within the county during the year in which the reappraisal is performed shall be based upon the valuation for assessment as reflected in the county's abstract for assessment. The state board of equalization shall also order the board of county commissioners of the county to impose, and the board of county commissioners shall impose, at the time of imposition of property taxes during such year an additional property tax on all taxable property within the county in an amount sufficient to repay, and the board of county commissioners shall repay, the state for any excess payments made by the state to school districts within the county during the year in which such reappraisal was performed plus interest thereon at a rate and for such time as are prescribed by law. (IV) If the valuation for assessment of a county as reflected in its abstract for assessment is more than five percent below the valuation for assessment for such county as determined by the study and if the state board of equalization fails to order a reappraisal, state equalization payments to school districts within the county during the year following the year in which the study was conducted shall be based upon the valuation for assessment for the county as reflected ​ in the county's abstract for assessment. The board of county commissioners of such county shall impose in the year in which such school payments are made an additional property tax on all taxable property in the county in an amount sufficient to repay, and the board of county commissioners shall repay, the state for the difference between the amount the state actually paid in state equalization payments during such year and what the state would have paid during such year had such state payments been based on the valuation for assessment as determined by the study. Source: Entire article added, effective August 1, 1876, see L. 1877, p. 58. L. 1879: Entire section amended, p. 31. L. 1891: Entire section amended, p. 89. L. 03: Entire section amended, p. 152. L. 56: Entire section amended, see L. 57, p. 796. L. 82: Entire section amended, p. 691, effective upon proclamation of the Governor, L. 83, p. 1682, December 30, 1982. L. 88: (1)(b) amended, p. 1457, effective upon proclamation of the Governor, L. 89, p. 1662, January 3, 1989. L. 2000: (1)(b) amended, p. 2783, effective upon proclamation of the Governor, L. 2001, p. 2392, December 28, 2000. Cross references: For provisions concerning property valuation by market approach only, see § 20 (8)(c) of this article and § 39-1-103 (5)(a); for the performance of labor or making improvements upon any lode claim or placer claim or for the payment of an annual claim rental fee, see §§ 30-1-103 (2)(m) and 34-43-114; for property exempt from taxation, see article 3 of title 39; for valuation and assessment of public utilities, see article 4 of title 39; for valuation of real and personal property, see part 1 of article 5 of title 39; for valuation of mines, see article 6 of title 39; for valuation of oil and gas leaseholds and lands, see article 7 of title 39.