Colorado Property Tax Calculator - From actual value, assessment rate, and mill levy

The Colorado Property Tax Calculator turns three numbers you already have into a clear annual tax estimate: your property's actual value, the statutory assessment rate, and your county mill levy. Colorado does not tax a home at its full market price, so the result looks very different from what you would see in a state that assesses value closer to 100%.

• • Home buyers: Estimate the yearly tax before closing so the payment fits the budget.
• • Current owners: Check whether a reassessment or a new mill levy moved the bill as expected.
• • Landlords: Model the holding cost on a Colorado rental before buying.
• • Relocating households: Compare Colorado's low effective rate against a state with higher property taxes.

The tool is built around the way Colorado actually levies the tax rather than a generic percentage guess. You enter the actual value from your assessment notice, choose residential, non-residential, or a custom class, and add the mill levy printed on the same notice.

Because the residential assessment rate is set by the legislature and the mill levy is set locally, the calculator keeps both as inputs you control. That lets you test next year's rates without waiting for a new assessment.

Most homeowners meet the tax only once a year, on the notice, and never see the line-by-line path from market value to dollars. This tool lays that path out so the number stops feeling arbitrary.

If you are moving from another state, the gap is the surprise. A $500,000 home in Colorado carries far less property tax than the same home assessed at full value elsewhere, even before local rates are considered.

Pair the tax estimate with your take-home pay using the Colorado paycheck calculator to see the full monthly housing burden.

The math follows Colorado statute. Every step maps to a line on your county tax notice, which makes it easy to check the result against the official figure.

• Actual value: The county assessor's market-value estimate for the assessment year, shown on your notice.
• Assessment rate: 6.765% for homes and 27.9% for non-residential property in the 2023-2024 cycle; a custom rate covers special classes.
• Mill levy: Total local rate in mills; divide by 1,000 to turn it into a decimal multiplier on assessed value.
• Senior exemption: Exempt actual value for qualifying seniors and disabled veterans, removed before the assessment-rate step.

The assessed value is the number Colorado actually taxes. Multiplying it by the mill levy in decimal form gives the dollar tax before any credits.

The effective rate divides the final tax by the home's actual value, which is the figure most buyers care about when comparing states.

Counties reassess on a fixed schedule, and the assessment notice shows both the actual value and the prior year's figure, so you can watch the change feed straight into the math here.

School districts, fire districts, and the county itself each set a slice of the mill levy. The total printed on your notice is the sum, and that sum is what this tool multiplies by.

According to the Colorado Division of Property Taxation, which publishes the assessment rates, mill-levy process, and the senior and disabled veteran exemption this calculation follows. After the Gallagher Amendment was repealed, the Colorado General Assembly set the residential assessment rate at 6.765% and the non-residential rate at 27.9% for the 2023 and 2024 tax years.

See how different the model is by running the California property tax calculator, which caps assessed value under Proposition 13.

Four ideas explain almost every line of a Colorado tax notice. Understanding them removes the guesswork from the result.

Assessment rate and mill levy do different jobs in the Colorado Property Tax Calculator. The rate is statewide and statutory; the levy is local and annual. A change in either one moves your bill.

The senior and disabled veteran exemption works on actual value, not assessed value, so it is applied first in the sequence.

Residential and non-residential property sit on different assessment rates by design. A mixed-use building may even split into two classes, each taxed on its own slice of value.

Because the effective rate compares tax to full market value, it falls every time the market value rises faster than the levy. That is why the rate can drift down even when the dollar bill rises.

For a neighboring-state contrast on assessment and levies, the Arizona property tax calculator shows a different rate structure.

Gather your assessment notice and tax notice, then work top to bottom.

1. 1 Enter actual value: Type the market value from your county assessment notice.
2. 2 Pick the class: Choose residential or non-residential, or custom if your district uses a special rate.
3. 3 Add the mill levy: Copy the total mills from your tax notice; use the custom-rate field only for unusual classifications.
4. 4 Apply any exemption: Enter the exempt actual-value amount if you qualify as a senior or disabled veteran.
5. 5 Read the results: Note assessed value, annual tax, and effective rate, then compare to the official bill.

A $400,000 non-residential building at 27.9% with a 90-mill levy returns a $111,600 assessed value and about $10,044 in tax, an effective rate near 2.5%.

If the property is a rental, carry the estimate into the rental property tax calculator to fold it into cash flow.

The calculator is most useful as a check against the official notice rather than a substitute for it.

• • Sanity check: Confirm the county math after a reassessment or a levy change.
• • Scenario planning: Test next year's mill levy before the budget is final.
• • Buying decisions: Compare the all-in tax cost across Colorado counties before making an offer.
• • Exemption clarity: See exactly how the senior or disabled veteran exemption lowers the bill.

Because the inputs mirror the notice, a mismatch points you straight to the line that changed.

The effective-rate output is the number to quote when comparing Colorado with another state.

Buyers often underestimate Colorado taxes because the headline mill levy looks high; running the number on actual value shows the real burden before an offer is signed.

To weigh relocation, the Alabama property tax calculator shows how another low-rate state stacks up.

Three inputs drive the number, and small changes in any one of them move the bill more than people expect.

• • The estimate excludes local credits, senior homestead deferrals, and special-district fees that may appear on the final notice.
• • Rates change by legislation and by annual levy setting, so confirm the current year's figures with your county assessor.

Because the mill levy, assessment class, and senior exemption each feed straight into the formula, the most reliable estimate comes from this year's notice rather than last year's numbers.

Treat the output as a planning estimate. The official notice remains the amount due.

Special districts such as metro districts can add mills that do not appear in a neighboring property's levy, so two homes a mile apart can differ by hundreds of dollars.

Some seniors qualify for a homestead exemption in addition to the assessment exemption; the calculator models the assessment exemption, and you should add any homestead credit from your county separately.

According to Tax Foundation, frames Colorado’s overall tax burden and helps explain why its effective property rate sits near 0.5%, among the lowest in the country.

For another assessment-rate comparison, the Arkansas property tax calculator illustrates a state with its own classification rules.