Rate Breakdown

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

How Property Tax Works in Jefferson County

Jefferson County calculates property taxes based on two key components: the assessed value of the property and the applicable millage rate. The County Assessor’s Office determines the assessed value each year by estimating the market value of the land and any structures on it, then applying a statutory assessment rate (typically 7.15 % of market value for residential properties). Once the assessed value is established, the County Treasurer multiplies that figure by the total millage rate—expressed in dollars per $1,000 of assessed value—to arrive at the annual tax bill.

Millage rates are set by a variety of taxing entities, including the Jefferson County government, school districts, fire protection districts, and special districts such as water or transportation authorities. Each entity proposes its own rate, which the County Board of Commissioners approves. Because multiple districts can overlap, the combined millage rate for a single parcel often ranges from 80 to 130 mills, depending on location.

• Assessed Value: Market value × 7.15 % (residential)
• Millage Rate: Sum of all district rates (e.g., county, schools, fire)
• Tax Calculation: (Assessed Value ÷ 1,000) × Total Millage Rate

Available Exemptions

Colorado law provides several exemptions that can lower the taxable portion of your assessed value. Jefferson County applies these statewide exemptions, and they appear as reductions on your tax bill.

• Homestead Exemption: Reduces the assessed value of a primary residence by up to $150,000, providing significant tax relief for most homeowners.
• Senior Citizen Exemption: Residents 65 years or older may qualify for an additional reduction of up to $1,500 in assessed value, subject to income limits.
• Disability Exemption: Qualified individuals with a disability can receive a $100,000 reduction in assessed value for their primary residence.
• Veteran Exemptions:
  • Disabled veterans may receive a $250,000 reduction.
  • Surviving spouses of veterans killed in action may qualify for a $250,000 reduction.

To claim any exemption, you must file the appropriate application with the Jefferson County Assessor’s Office by the deadline (usually March 31). Documentation such as proof of age, disability status, or veteran service records is required.

Payment Schedule & Deadlines

Jefferson County property taxes are billed twice a year. The first installment is due on **April 30** and covers the first half of the tax year; the second installment is due on **October 31** for the remaining balance.

• Full Payment: Pay the entire bill by April 30 to avoid any interest.
• Two‑Installment Option: Pay half by April 30 and the remaining half by October 31.
• Late Payment Penalties: Payments made after the due date incur a 5 % penalty plus interest calculated at the state‑mandated rate.

Payments can be made online through the Jefferson County Treasurer’s portal, by mail, or in person at any Treasurer’s office. Setting up automatic withdrawals ensures you never miss a deadline.

Appealing Your Assessment

If you believe your property’s assessed value is inaccurate, you have the right to appeal. The process is administered by the Jefferson County Board of Assessment Appeals.

• File a Notice of Appeal: Submit the form (available on the County Assessor’s website) by **July 31** of the tax year in question.
• Gather Evidence: Include recent sales of comparable properties, a professional appraisal, or proof of errors in the assessor’s records.
• Hearing: An appointed hearing officer will review your case, often within 30 days of filing.
• Decision: The Board issues a written decision. If you disagree, you may appeal to the Colorado Board of Assessment Appeals within 30 days of the county’s ruling.

Timely filing and thorough documentation are critical. Consulting a local real‑estate attorney or tax professional can improve your chances of a favorable outcome.