Aspen, Colorado Property Tax: Rates, Exemptions, and Transfer Tax

Aspen Colorado property tax bills are built from two numbers multiplied together: the assessed value of your home and the total mill levy for the tax district it sits in. For the 2026 tax year, Colorado assesses residential property at two different rates depending on which taxing body is collecting: 6.8% for local government levies (county, city, fire, library) and 7.05% for school district levies.¹² Aspen’s dollar amounts run high not because the rates are unusual but because the market values are.

How the Bill Is Built

A mill is one dollar of tax per $1,000 of assessed value. A property with an assessed value of $200,000 in a district with 30 total mills owes $6,000.³ The wrinkle in Aspen is that your assessed value gets calculated twice, once at each residential rate, because the state now splits the school portion from everything else.

Every Aspen property sits inside overlapping jurisdictions that each set their own mill levy: Pitkin County, the City of Aspen, the Aspen School District, the Aspen Fire Protection District, the Pitkin County Library, and any applicable special districts. Those levies add up to the total mill levy that appears on your annual tax statement from the Pitkin County Treasurer.³ The exact total depends on your address.

2026 Assessment Rates

Colorado’s dual residential assessment rate works like this:

The 6.8% local government rate applies to all non-school levies. Before it’s applied, your home’s actual value is reduced by 10%, capped at a $70,000 reduction. Homes valued at $700,000 or less get the full 10%; homes above that cap out at $70,000 off.¹
The 7.05% school district rate applies to the full actual value. No reduction.²

Commercial rates run far higher: 25% of actual value for improved commercial property, 26% for other commercial property.³⁴⁵

Running the Numbers on a $4 Million Aspen Home

Take a home with an actual market value of $4,000,000.

For the local government portion, subtract the $70,000 reduction: $3,930,000. Multiply by 6.8%: $267,240 in assessed value.¹ For the school portion, multiply the full $4,000,000 by 7.05%: $282,000 in assessed value.²

Then apply the mill levies: multiply the local government assessed value by the combined non-school mill levy for your district, multiply the school assessed value by the school district mill levy, and add them together. The specific mills for your address appear on your tax statement or through the Pitkin County Treasurer.³

Notice how little the $70,000 reduction does at Aspen prices. It shaves about $4,760 off the local government assessed value on a $4 million home, and only the non-school mills apply to that difference. The reduction is designed for homes near or below the $700,000 threshold, where the full 10% actually moves the needle.

Valuation Cycle and How to Protest

Colorado reassesses real property every two years, in odd-numbered years, and residential values are set solely by comparable sales.³⁶ The Pitkin County Assessor mails Notices of Valuation on May 1. In Aspen, where houses on the same block can range from $2 million to $30 million, which comparable sales the assessor picks matters a lot.⁷

If the number on your Notice of Valuation looks wrong, you have about five weeks to protest. For 2026, the window runs May 4 through June 8, with the postmark on the final day being the cutoff. You can only challenge the value itself, not the mill levies or the tax rate.⁷

What the assessor will consider: comparable sales from your neighborhood, a professional appraisal from the relevant period, listing information if the property is on the market, and documentation of errors in the assessor’s records. Deed-restricted or employee housing units need a letter from the governing housing authority stating the correct value. Zillow estimates are not accepted.⁷

Submit protests by email to assessormail@pitkincounty.com, by fax, by mail, or in person at 530 E. Main St., Suite 204, Aspen. The assessor mails a Notice of Determination by June 30. If you disagree, you can petition the Pitkin County Board of Equalization by July 15, but only if you filed a timely protest first. Beyond that, a 30-day window opens to appeal to the State Board of Assessment Appeals, file in district court, or request binding arbitration.⁷

Exemptions That Reduce What You Owe

Senior Homestead Exemption

If you’re 65 or older and have owned and lived in your Aspen home as your primary residence for at least ten consecutive years, you can exempt 50% of the first $200,000 of actual value, a $100,000 reduction in taxable value.⁸ The effect is smaller in Aspen relative to overall value than it is elsewhere in the state, but it still saves real money.

Disabled Veterans and Gold Star Spouses

Veterans rated 100% permanently disabled by the U.S. Department of Veterans Affairs get the same 50% exemption on the first $200,000 of value. Gold Star spouses (surviving partners of service members who died in the line of duty or from a service-connected injury) also qualify. Applications go to the Colorado Division of Veterans Affairs and are due by July 1 of the year you want the exemption.⁹

Tax Deferral for Seniors and Active Military

Homeowners 65 and older, along with active military members, can defer property taxes through a state program that operates as a low-interest loan. The state records a junior lien on the property, and repayment typically comes when the home is sold or the owner dies. Applications run January 1 through April 1 each year through the Pitkin County Treasurer or at colorado.propertytaxdeferral.com. This is a postponement, not an exemption.

Payment Deadlines and Late Consequences

You can pay the full annual bill by April 30, or split it into two equal installments due by the last day of February and June 15. Any bill under $25 must be paid in full.³¹⁰

Pitkin County takes online payments by credit card, debit card, and eCheck, along with mailed checks and in-person cash or check payments at the Treasurer’s office. Wire transfers are handled case-by-case with advance coordination. ACH is not accepted.¹⁰

Miss a deadline and interest starts at 1% per month. If the first installment isn’t paid by the last day of February, interest accrues from March 1. If the second isn’t paid by June 15, interest on that portion begins June 16, and interest on the still-unpaid first installment keeps compounding at the same time. One narrow relief: if the Treasurer mails the tax statement late, you get a 30-day grace period on the first installment.¹¹

Long-unpaid taxes go to the annual tax lien sale, held online. For 2026, the sale is scheduled for November 5, with delinquent properties listed in the Aspen Daily News starting in October. Lien buyers earn simple interest at 9 percentage points above the Federal Discount Rate as of September 1 each year, fixed for the life of the certificate. You can redeem the property by paying off the lien, back taxes, interest, and fees at any time before a Treasurer’s Deed auction, which a lien holder can request 3 to 15 years after buying the certificate.¹² At Aspen values, the downside of letting a bill go delinquent gets very expensive very quickly.

The 1.5% Transfer Tax on Aspen Purchases

One cost that doesn’t show up on an annual bill but hits at closing: Aspen charges a 1.5% Real Estate Transfer Tax on property sold within city limits. One percentage point funds affordable housing programs; the remaining half a point supports the Wheeler Opera House and arts programming at the Red Brick Center for the Arts. On a $5 million purchase, that’s $75,000 due at closing.¹³

The housing portion exempts the first $100,000 of the sale price, and deed-restricted affordable units are fully exempt. Other exemptions cover transfers involving government entities, gifts without financial consideration, inheritance, foreclosures where the holder plans to resell within two years, and transfers that correct or confirm a prior conveyance.¹³ The RETT applies only inside Aspen city limits; unincorporated Pitkin County properties do not carry it.

1
Colorado Department of Local Affairs Division of Property Taxation. Residential Local Government Assessment Rate
2
Colorado Department of Local Affairs Division of Property Taxation. Residential School Assessment Rate
3
Colorado Department of Local Affairs Division of Property Taxation. Understanding Property Taxes in Colorado
4
Colorado General Assembly. SB23-303 Reduce Property Taxes and Voter-Approved Revenue Change
5
Colorado General Assembly. SB24-233 Property Tax
6
Justia. Colorado Code 39-1-103 – Actual Value Determined – When
7
Pitkin County, CO. Appeal Guide
8
Governor’s Office of the State of Colorado. DOLA’s Division of Property Taxation Encourages Eligible Colorado Seniors to Take Advantage of 2026-27 Exemption
9
Colorado Department of Local Affairs Division of Property Taxation. Property Tax Exemption for Veterans with a Disability and Gold Star Spouses in Colorado
10
Pitkin County, CO. Payments
11
Colorado Revised Statutes. Colorado Code 39-10-104.5 – Delinquent Interest
12
Pitkin County, CO. Tax Lien Sale
13
City of Aspen. Real Estate Transfer Taxes