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Colorado’s 2027 Reappraisal for Commercial Property

Every Colorado county revalues property for 2027. The new values reflect the market on June 30, 2026, using sales and income from January 2025 through June 2026, and they hold for both 2027 and 2028. Notices of value mail by May 1, 2027, protests are due June 1, 2027, and all nonresidential property, including industrial buildings, vacant land and business personal property, is assessed at 25% under current law.

By Charlie Young, Principal & Founder · IPT, ULI & CREDA member · LinkedIn · Last reviewed October 2026

Values Set As Of
June 30, 2026
Protest Deadline
June 1, 2027
Nonresidential Rate
25%
The 2027 Reappraisal

What changes for commercial property in 2027?

Two things change at once. Every property gets a new value, set from the market as of June 30, 2026 rather than June 30, 2024. And the assessment rate, the share of that value that is taxed, settles at 25% for all nonresidential property under the law enacted in the 2024 special session (C.R.S. § 39-1-104(1.9)(c), House Bill 24B-1001).

Colorado assessment rates by class, 2025 to 2027
Class202520262027
Commercial-classed buildings (offices, retail, lodging, warehouse)27%25%25%
Industrial-classed buildings (manufacturing, processing)27%26%25%
Vacant land27%26%25%
Business personal property (equipment, furniture)27%26%25%

From 2027, the commercial and industrial classes carry the same rate, so the class line between them no longer changes the bill. The line that still matters is residential against nonresidential: residential property, including apartments, carries its own lower rates (7.05% for school levies and 6.8% for other levies in 2026). The legislature has changed these rates repeatedly since 2022, so confirm the rate on your notice. Every ratio since 2024 is on the numbers page.

The Valuation Date

What market do the 2027 values reflect?

Colorado values property as of June 30 of the year before the reappraisal, so 2027 values reflect June 30, 2026 (C.R.S. § 39-1-104(10.2)). Assessors use sales and income from the 18 months ending that date, reaching back as far as five years when sales are too few, and every sale they rely on must be adjusted to June 30, 2026 and reflect the price of the real property only.

Condition is a separate date. What is built, demolished or in use on January 1, 2027 is what gets valued, at June 30, 2026 prices, and the use on January 1 sets the class. That is why construction and conversion timing matter as much as the market: a residential foundation completed by January 1 can move a site to the residential rate, and an office converted to apartments changes class only on the January 1 after the use changes (office to residential).

The rate change, in dollars

An industrial building valued at $10 million, at 100 mills, pays $260,000 for 2026. With no change in value, its 2027 bill at 25% is $250,000. A commercial building with the same value pays $250,000 in both years, so its 2027 bill moves only with its value and its levy. Districts set mill levies each December, after the values are known.

Industrial, $10M, 2026 at 26%$260,000
Industrial, $10M, 2027 at 25%$250,000
Commercial, $10M, 2026 and 2027 at 25%$250,000
Each $1M of 2027 value at 100 mills$25,000 a year
Business Personal Property

How is equipment taxed in 2027?

Equipment and furniture drop from 26% to 25% in 2027, and the exemption becomes a flat $58,000 of actual value per county (Senate Bill 26-116). Declarations are due April 15, 2027, and the declaration is where most personal property value is decided: equipment already gone, software reported as hardware, and items the county already taxes with the building all stay on the schedule until someone takes them off. How a declaration review works.

Earlier Years

Can you still appeal 2024, 2025 or 2026?

The 2027 notice is not the only opening. Colorado’s abatement petition, its refund claim for overvalued years, reaches back to the two most recent levied years (C.R.S. § 39-10-114).

Abatement windows for Colorado tax years 2024 to 2026
Tax yearStatus as of October 2026
2024Closes January 1, 2027
2025Open until January 1, 2028, unless the year was protested and decided, which bars an overvaluation claim for that year
2026Opens once the 2026 taxes are levied and runs two years from January 1, 2027

A 2025 value settled at the state Board of Assessment Appeals must carry into 2026 unless the property changed; if the county has not made the change, abatement is the remedy. Each year is its own claim, and the evidence must match that year’s June 30, 2024 valuation date.

Key Dates

When are 2027 Colorado property tax protests due?

  1. January 1, 2027
    Abatement for tax year 2024 closes
    The last day to petition for abatement of tax year 2024.
  2. April 15, 2027
    Personal property declarations
    Filed with each county assessor; extensions are available by written request.
  3. By May 1, 2027
    Notices of value mail
    The 2027 values, which hold for 2027 and 2028.
  4. June 1, 2027
    Protest deadline
    One week earlier than the June 8 deadline of past years (Senate Bill 26-046).
  5. June 30, 2027
    Personal property protests
    July 31 in counties using the alternate procedure.
  6. July 15, 2027
    Income and expense disclosure
    In counties using the alternate procedure, an appeal to the county board brings mandatory income and expense disclosure, due by July 15.
  7. By August 15, 2027
    Assessor determinations
    In counties using the alternate procedure; the end of June elsewhere.
  8. September 15, 2027
    County board petitions
    In counties using the alternate procedure; July 15 elsewhere.
  9. September 1 or December 1
    State board, district court or arbitration
    The later of September 1 (December 1 in alternate-procedure counties) or 30 days after a decision mailed off the regular schedule (Senate Bill 26-046).

The nine counties over 300,000 people (Denver, Adams, Arapahoe, Jefferson, Douglas, Boulder, El Paso, Larimer and Weld) use the alternate protest and appeal procedure in reappraisal years. Every state’s dates are in the deadline table.

Before May 1

What should owners do before the notices arrive?

  • Pull the 2025 record. Whether the last appeal was argued, waived, settled or withdrawn, and whether a settled value carried into 2026. In 2025, owners who argued at the county board won far more often than those who did not (the 2025 results, county by county).
  • Gather income through June 30, 2026. Rent rolls, operating statements and concessions up to the valuation date are the 2027 case.
  • Check the class on January 1, 2027. Apartments, extended-stay hotel rooms and finished conversions are residential use, assessed at about 7% instead of 25% (hotels, how each class is valued).
  • Review the April 15 declaration before it is filed. Personal property values are mostly decided by what the owner reports.
  • Benchmark the value. Compare it with county peers in the assessment check.
  • Decide on representation before May. The protest window is about four weeks long.
2027 FAQ

Common questions

What is the assessment rate for commercial property in Colorado in 2027?
25% of actual value under current law, the same rate as 2026 for commercial-classed buildings. Industrial buildings, vacant land and business personal property drop from 26% in 2026 to 25% in 2027 (C.R.S. 39-1-104(1.9)(c)).
When is the 2027 property tax protest deadline in Colorado?
Notices of value mail by May 1, 2027, and protests must be postmarked or delivered by June 1, 2027, one week earlier than the June 8 deadline of past years (Senate Bill 26-046).
What date are Colorado’s 2027 property values based on?
June 30, 2026. Assessors use sales and income from the 18 months ending that date, reaching back as far as five years when sales are too few, and adjust each sale to June 30, 2026.
How long do 2027 values last?
Two years. The 2027 value is normally carried into 2028 unless the property changes, so a reduction for 2027 usually saves tax in both years.
Can I still appeal my 2025 or 2026 Colorado property taxes?
Often, by abatement petition. Tax year 2025 is open until January 1, 2028 unless it was protested and decided; tax year 2026 opens once its taxes are levied and runs two years from January 1, 2027. Tax year 2024 closes on January 1, 2027.
Does the 2027 rate apply to business personal property?
Yes. Business personal property is assessed at 25% from 2027, down from 26% in 2026, and accounts at or below $58,000 of actual value per county owe nothing (Senate Bill 26-116).

Find out what 2027 means for your property

Send the notice of value, or the address and county. The request is acknowledged within one business day, and the Initial Consultation ends in a written memo: whether the value holds up against the June 30, 2026 evidence, the dollars at stake over 2027 and 2028, and the exact fee. If there is no case, the memo says so.

Initial Consultation See the Fee Matrix

Related: Colorado appeal guide · appeal deadlines · Colorado numbers · should you appeal · hotel appeals