Denver Buyers Still Have Until September 15 to Fight Their Property Tax Bill
- Jerad Larkin
- 1 day ago
- 6 min read
A buyer I worked with this summer ran his numbers on a Wheat Ridge house three times before he wrote the offer. Purchase price, rate, insurance, HOA dues where they applied. He felt good about the payment. Then the escrow analysis landed two months after closing and his mortgage payment jumped $180 a month. The reassessed property tax bill was the reason, and nobody had walked him through it before he signed.
That surprise is hitting Denver Metro buyers across the price spectrum right now, and most agents I talk with have not connected it back to Colorado's 2025 reassessment, or to the appeal window that is still partly open through September 15.
Why are property tax bills catching Denver Metro home buyers off guard in 2026?
Colorado's 2025 property reassessment sharply raised many Denver Metro home values, and the resulting 2026 tax bills are pushing buyers' escrowed mortgage payments above what they budgeted for at closing.
As a Sales Executive with Chicago Title Colorado, I sit inside the closing process for hundreds of Denver Metro transactions a year, and property taxes are the line item buyers understand the least. Not because the math is complicated. Because almost nobody explains it to them before they sign a purchase contract.
Here is what actually changed in 2026, why it is inflating monthly payments across Denver, Aurora, Lakewood, and the rest of the metro, and the two-step appeal process that is still partly open right now for homeowners who already pushed back on their assessed value.
What Actually Changed With Colorado Property Taxes in 2026?
Colorado reassesses property values every two years, always in odd years. The 2025 reassessment set the values that apply to both the 2025 and 2026 tax years, based on sales activity from July 1, 2022 through June 30, 2024. Because that window captured some of the hottest years the Denver Metro market has seen, a lot of Front Range homeowners opened their Notice of Valuation last spring to actual values that jumped 30 percent or more from the prior cycle.
The bill you actually pay is not based on that full actual value. Under SB24-233, the state now reduces a home's actual value by 10 percent, capped at $700,000, before applying the assessment ratio. For 2026, that residential assessment ratio sits at 6.7 percent. The county then applies its mill levy to whatever is left. Two homes with the same sale price can carry very different tax bills depending on the county, the school district, and the special taxing districts layered on top.
For a full county-by-county breakdown of how the reduction and ratio interact, this Colorado property tax guide walks through the math in more detail than most agents will ever need, but it is worth bookmarking for client questions.
Why This Hits Buyers Harder Than Sellers
A seller who has owned a home for years is often still working off an older assessed value and an escrow account that has had time to adjust. A buyer steps into the current reassessed number on day one, and most loan estimates are built off the prior owner's tax bill rather than what the county will actually charge once the sale records. That gap is where the surprise lives.
Why Are Denver Metro Buyers Getting Blindsided at Closing and Beyond?
Lenders typically estimate a buyer's escrow account using the seller's most recent tax bill, not the reassessed value tied to the new purchase price and new ownership. On homes that changed hands after a big reassessment jump, or new construction that was taxed on raw land the year before, the real bill often lands well above the estimate. Buyers do not usually see the gap at closing. They see it 12 to 14 months later, when the lender runs an escrow analysis, finds a shortage, and spreads the makeup payment across the next year.
That shortage lands directly on debt-to-income ratios agents already treated as tight. A buyer who qualified at a certain PITI in July can find their real payment several hundred dollars higher by the following year, which matters even more for anyone who stacked in CHFA or NeighborhoodLIFT down payment assistance to get into the home in the first place.
The Conversation to Have Before Writing an Offer
Pull the actual current tax bill from the county treasurer's site, not the estimate a portal shows. Ask the lender to confirm the escrow will be built on the reassessed number, not the seller's old bill. And if the buyer is already stretching to qualify, walk through how seller concessions and rate buydowns interact with a tax bill that could move again at the next reassessment in 2027.
You Still Have Until September 15 to Push Back on an Assessment
Colorado runs the appeal process in two steps. The first step, appealing directly to the county assessor, ran from May 1 through June 8, 2026, and that window has closed for this cycle. If a homeowner protested their value and received a Notice of Determination they disagree with, they get a second shot: an appeal to the county Board of Equalization, and in most Denver Metro counties that window stays open through September 15, 2026.
This matters for any client who protested earlier this year and is sitting on a partial win or an outright denial. It is worth a phone call before that date passes. For buyers or agents who missed the June deadline entirely, the move now is to build the file for next cycle: pull comparable sales, document any condition issues that would argue for a lower value, and calendar the May 2027 window before it opens.
What Actually Moves an Assessor or the Board of Equalization
Comparable sales from the same reassessment window carry the most weight, not current asking prices. Documented deferred maintenance or major repairs help. A formal appraisal tends to carry more weight than a CMA in front of the Board of Equalization. None of this is legal advice, and every county runs its own hearing process, so anyone appealing should confirm current deadlines and procedure directly with their county assessor.
How Should Denver Metro Agents Talk to Buyers About Property Taxes Right Now?
Set the expectation early, not at the closing table. When you build a buyer's target payment, use the reassessed tax figure, not the seller's current bill, and tell them plainly that the next reassessment in 2027 could move that number again. Part of what I do as a Sales Executive at Chicago Title Colorado is calculate the exact tax prorations between buyer and seller at closing, so both sides know precisely what they owe on day one instead of guessing. That number is a good anchor for the conversation, but it is a snapshot, not a guarantee of what the bill looks like a year later.
Loop your lender partner in early, especially with mortgage credit scoring changes already shifting how buyers qualify this year. A buyer's true payment picture depends on getting the tax estimate right the first time, not fixing it after an escrow shortage notice arrives.
It also helps to frame this against the broader affordability picture right now. Between reassessed taxes and rising homeowners insurance costs across Colorado, carrying costs are eating a bigger share of a Denver Metro budget than they were three years ago.
DMAR's own market trend reports show a market leaning on what one recent industry analysis called shadow concessions to keep deals together, even as Front Range inventory tightens back up after a rare multi-year run of buyer's market conditions.
Frequently Asked Questions
Why did my Denver house payment go up so much after closing?
Your lender likely built your original escrow estimate off the seller's old tax bill instead of the reassessed value tied to your purchase. Once the county issues the real bill, your escrow account often runs short, and the lender spreads that shortage across the following year's payments.
How is the Colorado property tax assessment ratio calculated in 2026?
For 2026, Colorado applies a 10 percent actual value reduction, capped at $700,000, then taxes the remainder at a 6.7 percent residential assessment ratio under SB24-233. The county's mill levy is applied to that assessed value to produce the final bill.
Can I still appeal my Colorado property tax value in 2026?
The direct appeal to your county assessor closed June 8, 2026. If you already filed and disagree with the outcome, most Denver Metro counties allow an appeal to the county Board of Equalization through September 15, 2026. If you missed the window entirely, the next assessor-level appeal opens in May 2027.
How often does Colorado reassess property values?
Colorado reassesses on a two-year cycle, always in odd-numbered years. The 2025 reassessment set the values used for both the 2025 and 2026 tax years, and the next reassessment will set values for 2027 and 2028.
Is it worth appealing a property tax assessment for a Denver home?
It depends on how far your assessed value sits above recent comparable sales. If comps from the reassessment window support a lower value, an appeal can meaningfully reduce your tax bill for two years. It is generally not worth pursuing without solid comparable sales or an appraisal to back it up.
If you work with Denver Metro buyers and want the deeper breakdown, including scripts for the tax conversation and how it fits into your listing presentations, I cover it in my classes and resources at milehightitleguy.com. Reach out any time. I am glad to walk through a specific file with you.
Jerad Larkin
Sales Executive | Chicago Title Colorado
milehightitleguy.com
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