If you’re wondering why your Denver property taxes increased in 2026, the answer likely goes back to the 2025 reassessment cycle.
Colorado operates on a biennial property tax system, meaning property values are reassessed every two years — and those values directly impact your tax bill.
Here’s exactly how it works.
When Are Property Taxes Reassessed in Denver?
Property in the City and County of Denver is reassessed every two years in odd-numbered years.
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The most recent reassessment occurred in 2025
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Values were determined based on market data as of June 30, 2024
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Those values determine property taxes for 2025 and 2026
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The next reassessment will occur in 2027
If you’re paying taxes in 2026, they are based on your home’s estimated value from mid-2024 — not today’s market.
How Denver Property Taxes Are Calculated
Understanding the structure helps clarify why tax bills fluctuate.
1. Market Value Determined
The Denver Assessor analyzes comparable sales in your neighborhood during the statutory data period.
2. Assessment Rate Applied
Colorado applies a residential assessment rate set at the state level to determine assessed value.
3. Mill Levy Multiplied
Local entities (schools, city services, fire districts, etc.) apply a mill levy that determines the final tax amount owed.
Formula (simplified):
Market Value × Assessment Rate × Mill Levy = Property Tax Bill
Can You Appeal Your Denver Property Tax Assessment?
Yes — but only during the official appeal window.
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Notices of Valuation are mailed around May 1 in reassessment years.
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Homeowners typically have until early June to file an appeal.
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If you did not appeal in 2025, that valuation stands through 2026.
Your next opportunity to appeal will be Spring 2027.
Assessed Value vs. Market Value: Important Distinction
One of the most common misconceptions:
Your assessed value for tax purposes is not necessarily your current market value.
Because 2026 taxes are based on mid-2024 data, your home’s true market value in 2026 could be:
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Higher
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Lower
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Stabilized compared to 2024
This is particularly important if you’re considering selling this year.
What This Means for Denver Homeowners in 2026
If you are:
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Thinking about selling
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Planning renovations
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Evaluating equity
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Or simply budgeting for next year
It’s wise to understand both:
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Your assessed tax value
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Your current market value
They are often not the same.
Frequently Asked Questions
When are property taxes reassessed in Denver?
Every two years in odd-numbered years.
What year affects 2026 property taxes?
The 2025 reassessment, based on market data as of June 30, 2024.
When is the next Denver reassessment?
Can I appeal my 2026 tax bill?
You can only appeal during the reassessment year (next opportunity: 2027).
Final Takeaway
Denver property taxes in 2026 are based on 2025 reassessments using mid-2024 market data.
If you’re unsure whether your home’s assessed value aligns with today’s market, a current valuation can provide clarity.
At LUX, we’re always happy to provide a market analysis tailored to your neighborhood.
Find more information on the Denver Assessors Office website.
