Rate Breakdown

Property taxes in Summit County are calculated by multiplying the assessed value (minus exemptions) by the total local millage rate.

How Property Tax Works in Summit County

In Summit County, property taxes are calculated by applying the county’s millage rates to the assessed value of each parcel. The assessment is performed by the Colorado State Assessor, who determines the market value of a property as of January 1 each year. This value is then “normalized” (typically reduced by a standard factor of 2.0 for residential properties) to establish the assessed value that will be taxed.

The millage rate is expressed in dollars per $1,000 of assessed value. For the 2025‑2026 fiscal year, Summit County’s combined millage—comprising county, school, fire protection, and special district levies—averages around 130 mills (or $130 per $1,000 of assessed value). Individual properties may see a slightly higher or lower rate depending on which fire, water, or improvement districts apply.

To estimate your tax bill, multiply your assessed value by the applicable millage rate and divide by 1,000. For example, a home with an assessed value of $250,000 and a total millage of 130 mills would owe $250,000 × 130 ÷ 1,000 = $32,500 before any exemptions or abatements.

Available Exemptions

Colorado offers several exemptions that reduce the taxable portion of your assessed value. Summit County applies the statewide exemptions, which are:

• Homestead Exemption: Reduces the assessed value of a primary residence by $200,000. This is automatically applied for qualifying owners.
• Senior Citizen Exemption: Residents age 65 or older may receive an additional exemption of up to $150,000, provided they meet income and residency requirements.
• Disability Exemption: Individuals with a qualifying disability can claim an exemption of up to $150,000, similar to the senior exemption.
• Veteran Exemptions:
  • Disabled veterans receive an exemption ranging from $100,000 to $200,000, depending on the degree of disability.
  • Spouses of veterans who died as a result of service may claim a $100,000 exemption.

All exemptions must be applied for through the Colorado State Assessor's Office, and supporting documentation (proof of age, disability, or veteran status) must be submitted by the filing deadline, typically March 1.

Payment Schedule & Deadlines

Summit County property taxes are billed in two installments. Understanding the timeline helps avoid penalties:

• First Installment: Due October 1. This covers the period from July 1 to December 31.
• Second Installment: Due March 1. This covers the period from January 1 to June 30.
• Late Payment: A 5% penalty, plus interest, is assessed on any amount not paid by the due date. Interest accrues at the county’s statutory rate until the tax is paid in full.
• Payment Options: Taxes can be paid online via the Summit County Treasurer’s portal, by mailed check, or in person at the Treasurer’s office. Many residents also set up automatic bank drafts to ensure timely payment.

Property owners who qualify for a payment plan (often seniors or low‑income households) can request a quarterly schedule through the Treasurer’s Office, though interest may still apply.

Appealing Your Assessment

If you believe your property’s assessed value is inaccurate, you have the right to appeal. The process in Summit County follows these steps:

• Review your assessment notice: Received typically in early May. Verify the market value, property description, and any exemptions applied.
• File a Notice of Appeal: Submit the form to the Colorado State Board of Equalization (CBOE) by the deadline—usually July 31 of the assessment year.
• Gather evidence: Compile recent comparable sales, a professional appraisal, or documentation of property defects.
• Attend a hearing: The CBOE will schedule a hearing (often via video conference). Present your evidence and answer any questions.
• Receive the decision: The board issues a written determination. If the decision is unfavorable, you may appeal further to the district court within 30 days.

While the appeals process can be technical, many homeowners find success by focusing on clear, recent comparable sales and ensuring all exemption paperwork is up to date. For complex cases, consider consulting a property tax professional familiar with Summit County regulations.