By Prerna Kapoor, CLHMS | REAL Brokerage | April 5, 2026
If you own a home in Colorado, you already know the sting: property taxes went up. Way up. For many homeowners across Parker, Aurora, Castle Pines, and the broader Denver metro, the 2025-2026 reassessment cycle brought jaw-dropping increases.
But here is something most people don’t realize: you can fight back. Colorado law gives every homeowner the right to appeal their property tax assessment, and the process is more straightforward than you might think.
I walk clients through this all the time. Let me break down exactly how it works, what deadlines you need to hit, and how to build a case that actually gets results.
Why Colorado Property Taxes Jumped So Much
Colorado’s property tax system reassesses home values every two years. The most recent cycle looked at sales data from July 2022 through June 2024, a period when home prices were still climbing fast across the Front Range.
The result? Many homeowners in Douglas County, Arapahoe County, and Denver County saw assessed values jump 20-40% in a single cycle. In Parker alone, I’ve seen assessments increase by $80,000 to $150,000 over the previous valuation.
The tricky part is that home prices have actually softened since mid-2024. So your assessment might reflect peak prices that no longer match what your home would actually sell for today.
The Three-Level Appeal Process
Colorado has a structured process for challenging your property tax assessment. Think of it as three chances to make your case.
Level 1: County Assessor Protest (May 1 – June 1)
This is your first and best shot. When your county mails out Notices of Valuation (typically by May 1), you have until June 1 to file a formal protest with the county assessor’s office.
You can file online, by mail, or in person. Douglas County has an easy online portal at douglas.co.us/assessor/appeals. Arapahoe County accepts protests through their online system as well.
The assessor’s office will review your evidence and issue a decision, usually within a few weeks. Many homeowners get a reduction at this stage without ever needing to go further.
Level 2: County Board of Equalization (by July 20)
If the assessor denies your protest or doesn’t lower the value enough, you can appeal to the County Board of Equalization (CBOE). Your appeal must be postmarked or submitted in person by July 20.
The CBOE hearing is more formal. You’ll present your evidence to a panel, and the assessor’s office will present theirs. It sounds intimidating, but it’s designed for regular homeowners, not just attorneys.
Level 3: Board of Assessment Appeals or District Court
If the CBOE doesn’t rule in your favor, you have two more options: appeal to the state Board of Assessment Appeals (BAA) or file in district court. Most homeowners resolve things at Level 1 or 2, but these options exist for significant disputes.
How to Build a Strong Appeal Case
The assessor’s office isn’t going to lower your value just because you ask nicely. You need evidence. Here’s what works best.
Comparable Sales (Most Powerful Evidence)
Pull 3-5 recent sales of homes similar to yours in your neighborhood. Focus on homes that sold between July 2022 and June 2024 (the assessment period) AND homes that have sold more recently if values have dropped.
Match as closely as possible on square footage, lot size, age, condition, and location. If those comparable homes sold for less than your assessed value, that’s your strongest argument.
As a REALTOR with access to the full MLS, I can pull detailed comps for you. The data available on Zillow or Redfin is a starting point, but it often misses condition details and concessions that affect actual sale prices.
Property Condition Issues
Does your home need a new roof? Is the basement unfinished when the assessor thinks it’s finished? Are there structural issues, outdated systems, or deferred maintenance? Document everything with photos and repair estimates.
I’ve seen homeowners get $20,000-$50,000 knocked off their assessed value simply by showing that the assessor’s records contained errors about the property’s condition or features.
Assessment Errors
Check your property record card on the county assessor’s website. Look for mistakes in square footage, number of bedrooms or bathrooms, lot size, or year built. Errors happen more often than you’d think, especially if additions or renovations changed the home’s footprint.
What the Numbers Look Like in Real Dollars
Let’s say your home is assessed at $650,000 and you successfully argue it should be $580,000. That $70,000 reduction might save you roughly $400-$600 per year in property taxes, depending on your mill levy.
Over a two-year assessment cycle, that’s $800-$1,200 back in your pocket. And it takes about 2-3 hours of your time to put together a solid protest.
In Douglas County, the current residential assessment rate is 6.7%. In Arapahoe County, it’s similar. The mill levies vary by school district and special district, but even a modest reduction in assessed value translates to meaningful savings.
Key Deadlines for 2026
Mark these on your calendar right now:
May 1, 2026: Notices of Valuation mailed by county assessors
June 1, 2026: Deadline to file a protest with the county assessor
July 20, 2026: Deadline to appeal to the County Board of Equalization
August-September 2026: CBOE hearings typically held
Don’t wait until the last minute. If you’re planning to file, start gathering your comparable sales now. The June 1 deadline is firm, and you want time to put together a thorough case.
Should You Hire a Professional?
For most residential properties, you can handle the Level 1 protest yourself. The assessor’s office is required to review your evidence and respond, regardless of whether you have professional representation.
For high-value properties (over $1 million) or complex situations, some homeowners choose to hire a property tax attorney or consultant. Many work on contingency, meaning they only get paid if they save you money.
Either way, I always recommend starting with a free consultation with your REALTOR. I can pull the comparable sales data, help you identify errors in the assessment, and give you a realistic sense of whether an appeal is likely to succeed.
A Quick Step-by-Step Checklist
Here’s your action plan for the next few weeks:
Step 1: Look up your current assessed value on your county assessor’s website
Step 2: Review your property record card for errors in square footage, features, or condition
Step 3: Research comparable sales in your area (or ask your REALTOR for help)
Step 4: Document any property condition issues with photos
Step 5: File your protest before June 1, 2026
Step 6: If denied, consider appealing to the CBOE by July 20
The whole process is free. There is no downside to filing a protest if you have legitimate evidence that your assessment is too high.
The Bottom Line
Colorado property taxes have hit a lot of homeowners hard this cycle. But you don’t have to just accept the number on that notice. The appeal process exists for a reason, and plenty of homeowners successfully get their assessments reduced every year.
If you’re not sure whether your assessment is accurate, reach out. I’m happy to pull comparable sales data for your home and help you figure out whether an appeal makes sense. No cost, no pressure.
Thinking about buying or selling a home in Colorado?
Your home journey should feel exciting, not overwhelming. As your trusted advisor, I am here to make sure it does.
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Prerna Kapoor is a REALTOR® and Certified Luxury Home Marketing Specialist (CLHMS) with REAL Brokerage, specializing in residential real estate across Parker, Aurora, Lone Tree, Castle Pines, Highlands Ranch, Cherry Creek, Greenwood Village, and Centennial. She is fluent in English, Hindi, and Japanese (native) and is recognized as an International Sterling Society Award winner (2023, 2024, 2025). Prerna holds the RENE (Real Estate Negotiation Expert), PSA (Pricing Strategy Advisor), and ABR (Accredited Buyer’s Representative) designations.
