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Updated 2025 Tax Year

Jefferson County
Property Tax Guide

Everything you need to know about property taxes in Jefferson County, CO. Rates, due dates, exemptions, and how it affects your monthly payment.

10 Official Sources
8 min read
Quick Facts
Tax Rate
6.68% of assessed value (varies by district due to special taxing districts)
Exemptions
3+ Available
Section 1

How Property Tax Works

Jefferson County, Colorado operates on a property tax system that funds essential local services including schools, fire protection, libraries, parks, and county operations. Property taxes are calculated using assessed values determined during reappraisal cycles that occur every two years, with the most recent assessment rates set at 7.05% for school districts and 6.25% for local government purposes.

The effective property tax rate for Jefferson County is approximately 6.68% of assessed value for tax year 2025. However, actual tax rates vary significantly by location within the county due to special taxing districts such as school districts, fire protection districts, library districts, and metropolitan districts. Property owners may be subject to additional levies depending on their specific location within Jefferson County's boundaries.

Jefferson County's property tax system includes various tax credits available to qualifying property owners, though most require annual application and are not automatically applied. The county assessor determines property values but does not set tax rates - those are established by the various local government entities and special districts that provide services to residents.

Section 2

What Makes Up Your Tax Bill

ComponentRateDescription
School Districts7.05%Assessment rate for educational services and school operations
Local Government6.25%Assessment rate for county services, municipalities, and other local government functions
Fire Protection DistrictsVariesAdditional levies based on specific fire district boundaries
Library DistrictsVariesFunding for Jefferson County Public Library system
Metropolitan DistrictsVariesSpecial districts for infrastructure, parks, and community services
Total Effective Rate6.6824%Combined rate for tax year 2025 (varies by specific location)

Note: These rates apply to tax year 2025, payable in 2026. Actual tax bills will vary based on the specific combination of taxing districts that serve each property location within Jefferson County. Property owners should verify their specific district assignments through the Jefferson County Assessor's office.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Jefferson County, property taxes are due in two installments:

Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes in Jefferson County are additional property tax assessments that occur when there are changes to a property's assessed value during the tax year. Common triggers include new construction, major renovations, changes in property ownership, or corrections to previous assessments that result in increased taxable value.

When supplemental taxes are levied, they are calculated based on the difference between the new assessed value and the original assessed value, multiplied by the applicable tax rate for the remaining portion of the tax year. For example, if a home addition increases a property's assessed value by $50,000 in July, the supplemental tax would be calculated on that $50,000 increase for the remaining months of the tax year.

Property owners typically receive supplemental tax bills separately from their regular annual property tax statements. These supplemental assessments become due according to the same payment schedule as regular property taxes and may be paid in installments or in full, depending on the timing of the assessment.

Example Calculation

Example 1: $300,000 Home Value

  • Market Value: $300,000
  • Assessed Value (6.25% residential rate): $18,750
  • Less: Senior Property Tax Exemption (if applicable): -$200,000 assessed value reduction
  • Net Taxable Assessed Value: $18,750
  • Annual Tax (6.6824% rate): $1,253
  • Monthly Escrow: $104

Example 2: $600,000 Home Value

  • Market Value: $600,000
  • Assessed Value (6.25% residential rate): $37,500
  • Less: Disabled Veteran Exemption (if applicable): Varies based on disability rating
  • Net Taxable Assessed Value: $37,500
  • Annual Tax (6.6824% rate): $2,506
  • Monthly Escrow: $209

Example 3: $1,000,000 Home Value

  • Market Value: $1,000,000
  • Assessed Value (6.25% residential rate): $62,500
  • Net Taxable Assessed Value: $62,500
  • Annual Tax (6.6824% rate): $4,177
  • Monthly Escrow: $348

Note: Tax credits and exemptions shown require annual application and qualification verification. Actual rates may vary based on specific taxing district combinations in your area.

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Section 5

Escrow & Property Taxes

Most Jefferson County homeowners with mortgages have their property taxes collected through escrow accounts managed by their mortgage lender. Lenders typically collect 1/12 of the estimated annual property tax bill with each monthly mortgage payment, plus a cushion amount as required by federal regulations.

Property tax payments from escrow accounts are typically made by lenders in two installments following Jefferson County's payment schedule. The first half payment is due by February 28th (February 29th in leap years), and if the first half was paid, the second half is due by June 15th. Alternatively, the full annual amount can be paid by April 30th to avoid installment payments.

Property owners should verify that their lender has current and accurate tax information, especially after reappraisals or when tax rates change. If there's a shortage in the escrow account due to increased taxes, lenders will typically offer options to pay the shortage over 12 months or in a lump sum, while adjusting future monthly payments accordingly.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are Jefferson County property taxes due for tax year 2025? A: First half payment is due February 28, 2026 (February 29 in leap years). Full payment is due April 30, 2026. If paying in installments, the second half is due June 15, 2026.

Q: What tax credits are available and do they require application? A: Jefferson County offers several tax credits including the Disabled Veterans Property Tax Exemption, Senior Property Tax Exemption, and various agricultural exemptions. All tax credits require annual application and are NOT automatically applied. Application deadlines vary, with most due by July 1st.

Q: How does the Homestead Exemption work in Colorado? A: Colorado's homestead exemption limits assessment increases to protect long-term residents, but requires filing with the county assessor. It caps the growth in assessed value, not the market value, and must be applied for annually.

Q: How often are properties reassessed in Jefferson County? A: Jefferson County conducts full reappraisals every two years. Property owners receive notices of new assessed values and have the right to appeal if they believe the assessment is incorrect.

Q: What are the penalties for late property tax payments? A: Late payments incur interest charges and penalties. After June 15th, unpaid taxes become delinquent and additional fees apply. Properties with delinquent taxes may eventually face tax lien sales.

Q: Can I pay my property taxes online? A: Yes, Jefferson County offers online property tax payments through their Treasurer's office website. You can search property records and pay taxes electronically using the Property Records Search system.

Q: Why do tax rates vary within Jefferson County? A: Tax rates vary because different areas are served by different combinations of special districts (fire, library, school, metropolitan districts). Each district sets its own mill levy, creating different total tax rates across the county.

Q: How do I appeal my property assessment? A: Property assessment appeals must be filed with the Jefferson County Board of Equalization during the specified appeal period, typically between May 1st and June 8th following the assessment notice.

Q: What's the difference between assessed value and market value? A: Market value is the estimated fair market value of your property. Assessed value is calculated by applying the state-mandated assessment rate (6.25% for residential properties) to a portion of the market value.

Q: Are there property tax benefits for seniors or disabled veterans? A: Yes, but both require annual application. The Senior Property Tax Exemption is available for qualifying seniors, and the Disabled Veterans exemption is available for qualifying disabled veterans. Both have specific eligibility requirements and application deadlines of July 1st.

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