Real property must be revalued every odd numbered year in order to establish accurate values for all property located within the county. The actual value of real property is based on its value as of the appraisal date, which is the June 30th of the year prior to the reappraisal year. Residential property must be valued using only the market approach to value. In this approach, the value of the subject property is based on an analysis of comparable sales to predict the price properties would have sold for on the Appraisal date.
2025 Assessment Rates
The assessment rates for certain classes of property are listed below:
Residential and multi-family has mixed assessment rates: currently 6.25% for Local Governments and 7.05% for Schools (changes to the residential rates are determined by the Colorado Legislature and are subject to change in the fall)
Agricultural and All other Agricultural (Agricultural businesses) 27%
Personal Property including Renewable Energy 27%
All other classes are 27%, unless stated in the law.
Data Collection
This is the first step in the assessment process. Any information on ownership, location, use, sales, building measurements, construction type and costs, land characteristics and rental income are obtained from real property deeds and declarations, subdivision maps, building permits, and local building contractors. Other primary sources are declarations filed by owners of taxable personal property and appraisers who conduct on-site inspections to gather land and building characteristics.
The Assessor’s office values your property for ad valorem property taxation purposes. Mass appraisal is a process that allows for valuation of a universe of properties on June 30th of every even year in order to produce uniform, fair, and equitable values.
The sales are grouped by property types (single family, condos, townhomes) and regional location (economic/neighborhood areas). Value models are developed for each property type and their respective economic/neighborhood area. Economic/neighborhood areas have direct and immediate effects on value.
Neighborhood is defined by natural, man-made, or political boundaries and is established by commonalty, based on land use, types and age of buildings or population, the desire for homogeneity, or similar factors.
Economic area is a grouping of neighborhoods that have similar economic forces or geographic location.
In mass appraisal statistical and regression analyses of sales data, trends and patterns are used in creating base rates and adjustment factors which are applied to the universe of properties to estimate each property’s value.
Notice of Valuation
The Assessor is required to send a Notice of Valuation to property owners by May 1 of each reappraisal year (odd numbered years) for real property. During intervening (even numbered years), only those real properties with a change in characteristics from the previous year receive a Notice of Valuation. If you feel the value the Assessor has placed on your property is incorrect, you may wish to file an appeal.
You have the right to appeal your property value or its classification each year. Procedures for appealing your assessment are provided on this website, including deadlines for filing your appeal.
Certification to Taxing Authorities and Tax Warrant
In August of each year, the Assessor certifies the Preliminary total assessed value of all properties located within the boundaries of each taxing authority. Final Certifications are provided to each Taxing Authority in December. Assessed values are calculated by multiplying the actual value by the appropriate assessment rate. The residential assessment percentage is subject to change by the Colorado Legislature. The assessment rate is currently 6.25% for Local Government and 7.05% for Schools on residential property and on multi-family. These figures are used by the taxing authorities to determine their mill levies.
A mill levy is a tax rate that is applied to the assessed value of a property. The mill levy - which is sometimes referred to simply as a levy - is multiplied times the assessed value of a property to determine the amount of taxes due. 1 mill = .001 as a multiplier.
For example, on Residential and Multi-Family:
Actual Value multiplied by the appropriate assessment rate:
$545,000 actual value x 0.0625 (6.25% Local Government assessment rate) = $34,063 assessed value
$545,000 actual value x 0.0705 (7.05% School assessment rate) = $38,423 assessed value
Calculation of Property Tax
Local Government Assessed Value multiplied by mill levy
County 26.944
City 6.650
Water & Sanitation 9.12
Library 3.670
Metro District 9.50
TOTAL Local Government Rate 55.884 (.055884)
$34,063 Local Government assessed value x .055884 (55.884 mill levy) = $1,904
School Assessed Value multiplied by mill levy
School 69.071
TOTAL School Rate 69.071(.069071)
$38,423 School assessed value x .069071 (69.071 mill levy) = $2,654
Total $4,558 property tax
Each year county commissioners, city councils, school boards, and special districts (known as “taxing authorities”) determine the revenue needed and allowed under the law to provide services for the following year. They calculate a tax rate based on the revenue needed from property tax and the total assessed value of real and personal property located within the entity’s boundaries. The authorities determine their individual mill levies, which are then submitted to the Board of County Commissioners for review by December 15th. The mill levies are approved by the Board of County Commissioners and certified to the Assessor by December 22nd. Upon the receipt of the certified mill levies from the commissioners, the Assessor enters the mill levies, extends the calculations against the individual assessed values and forwards the resulting tax warrant to the Treasurer by January 10th for collection.
