Best Colorado Property Tax Appeal Services in 2026 (Compared)
Last updated: June 26, 2026
Colorado property tax protests are filed with the county Assessor by June 8, 2026 for the 2026 tax year. If the assessor denies your protest, you can appeal to the county Board of Equalization (BOE) by July 15. Colorado has a unique odd-year reassessment cycle, so 2026 is a reappraisal year, making it especially important to review your Notice of Valuation. Denver, Jefferson, Arapahoe, El Paso (Colorado Springs), and Boulder counties have large, active appeal markets. Property values in the Denver metro area have risen sharply since 2020, making appeals particularly valuable.
Rob Hartley·Updated June 26, 2026Check If You're Overpaying
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#1: AppealDesk - Best for Budget-Conscious Colorado Homeowners
AppealDesk provides comparable sales, assessment-ratio context, and county-specific filing instructions for your Colorado county assessor and BOE. All 64 CO counties covered. Colorado uses 100% of actual value as the assessed value for residential properties at a 6.765% assessment rate for 2026.
Pros
- +$49 flat fee, the lowest price
- +All 64 Colorado counties covered
- +Evidence packet delivered in minutes
- +Keep 100% of your savings
Cons
- –You file the protest yourself (10-15 minutes)
- –No BOE hearing representation
#2: O'Connor & Associates - Best for Full-Service Colorado Appeals
O'Connor provides full-service protest and BOE hearing representation across Colorado. Strong for high-value Denver metro properties.
Pros
- +50+ years of experience
- +Full-service including BOE hearings
- +Statewide Colorado coverage
Cons
- –Contingency percentage not prominently published
- –Process can span the full protest cycle
All Services at a Glance
| Service | Price | Model | Coverage | Best For |
|---|---|---|---|---|
| AppealDesk | $49 flat | DIY + evidence | All 64 CO counties | Budget-conscious, any CO county |
| O'Connor | % of savings | Full-service | All CO counties | High-value Denver metro |
How to Choose the Right Service
Colorado protests must be filed by June 8, 2026 with the county assessor. Act early, evidence packets from AppealDesk are delivered in minutes. Denver metro properties have seen significant value increases, making the math strongly favor flat-fee ($49) over contingency on any savings above $200/year.
Free tools to help you decide
Try our free savings calculator to check if you're overassessed before choosing a service.
Once you're ready, our appeal checklist walks you through every step.
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