🏠Colorado Property Tax Appeals: What Homeowners Should Know
Colorado property owners who believe their property has been valued incorrectly have a process for challenging the assessment. Because property-tax appeal deadlines can depend on the assessment year and the type of property, homeowners should review their assessment notice and confirm the applicable deadline with their county assessor.
Why Review Your Property Assessment?
Your property’s actual value is one of the factors used to determine property taxes. If you believe the assessor’s value does not accurately reflect the property’s value, you may be able to provide evidence and request a review.
This can be particularly important for homeowners who believe their property’s characteristics, condition, or market value have not been accurately reflected in the assessment.
What Property Owners Can Do
If you’re considering an appeal:
- Review your Notice of Valuation and the property information listed by the assessor.
- Check the property’s characteristics for accuracy, including size, use, and other relevant details.
- Gather supporting evidence, such as recent comparable sales, an appraisal, or documentation showing the property’s condition.
- Contact your county assessor’s office to confirm the applicable protest procedure and deadline.
- Submit your protest within the required timeframe and keep copies of your documentation.
The specific process and deadlines are administered at the county level, so property owners should not assume that a deadline applying in one Colorado county applies statewide.
What About 2026 Property Taxes?
Colorado’s property-tax system uses different assessment and collection timelines. The amount appearing on a future tax bill can be affected by the property’s assessed value and the applicable mill levies.
Because of this, homeowners should review their assessment information as soon as it becomes available rather than waiting until they receive the final tax bill.
What Evidence Can Help?
When challenging a valuation, useful information may include:
- Recent sales of comparable properties
- A professional appraisal
- Documentation of significant property damage or unusual conditions
- Evidence that the assessor’s property description is inaccurate
- Other information showing why the property’s value should be different
The strongest evidence is generally information that relates directly to the property being appealed and its market value.
A Practical Reminder
If you believe your property has been overvalued, contact your county assessor as early as possible and confirm the deadline that applies to your assessment.
Don’t rely on a statewide date such as October 15 unless your county has specifically provided that deadline for your property and assessment year.
Reliable Resources
- Colorado Department of Revenue — Division of Property Taxation — statewide property-tax guidance
- Your County Assessor’s Office — assessment records, protest forms, and applicable deadlines
- Colorado Property Tax Administrator — information about Colorado’s property-tax system
Property-tax procedures and deadlines can vary by assessment year and county. Property owners should confirm the current requirements and applicable deadline with their county assessor before filing an appeal.