Colorado property tax estimator

Estimate the tax bill before the district stack surprises you.

Short answer: the address controls the bill. Colorado property tax uses actual value, an assessment rate, and the combined mills from overlapping taxing districts.

Estimator

Colorado property tax estimate

Assessed value is roughly actual value times the assessment rate. The tax bill is assessed value times the total mills, divided by 1,000.

Actual value$Find this on the county assessor record or your notice of valuation. For planning, use a realistic purchase price.Residential assessment rate%This starter value is only a planning placeholder. Check the current Colorado assessment-rate table or your notice.Total millsFind the full mill levy on the county tax record or Colorado property tax map. Include every district.Current annual tax$Optional. Use the latest county treasurer bill if you want to compare against the current tax.

Apply qualified senior, disabled veteran, or Gold Star exemptionColorado's common exemption removes 50% of the first $200,000 of actual value for qualifying owners.

Assessed value

$40,625

Estimated annual tax

$3,331

Monthly escrow planning

$278

This is an estimate. It assumes the value, assessment rate, and total mills you entered are correct. It does not include every parcel-specific adjustment, fee, exemption, or future voter-approved change.

Confirm the official numbers with your county assessor or treasurer, the Colorado assessment-rate table, and the Colorado property tax map.

Step 1

Find actual value.

Use the county assessor value or a realistic planning value. Actual value is the assessor's estimate of market value. The county assessor is the official source for this number.

Step 2

Use the right assessment rate.

Assessment rates vary by property type and tax year. Check the Colorado assessment-rate table or your notice before you rely on the number.

Step 3

Add every mill.

The total mill levy is the full stack. This is where metro districts, fire districts, and school bonds can change the answer.

Plain English

A few words before you run the numbers

These are the official terms you will see on notices, county websites, and tax bills.

TABOR

Colorado's Taxpayer's Bill of Rights. It is why voter approval, refunds, and local revenue limits show up in tax conversations.

TABOR does not make every bill low. It changes how governments ask for and keep revenue.

Mill levy

The property-tax rate. One mill is $1 per $1,000 of assessed value.

A 75-mill total levy means about $75 for each $1,000 of assessed value.

Special district

A local government layer for services such as fire, library, sanitation, parks, or infrastructure.

A subdivision can be inside several districts at once.

Metro district

A type of special district often used to finance infrastructure in newer development.

It can add a large mill levy even when the home is outside the city center.

The Colorado formula in plain English

Start with actual value. That is the assessor's estimate of market value. Multiply it by the residential assessment rate to get assessed value. Then multiply assessed value by the total mill levy and divide by 1,000.

The hard part is not the math. The hard part is getting the right address-specific mill stack. County, school, city, fire, library, sanitation, and metro district mills can all overlap.

Why new subdivisions can feel expensive

Many newer Colorado neighborhoods use metro districts to pay for roads, utilities, landscaping, parks, or other infrastructure. That can mean a higher mill levy than an older nearby neighborhood, even when both homes use the same city name.

Why the bill can change even if you do nothing

Colorado assessment rates, actual values, voter-approved mills, bonds, and temporary tax-law changes can move over time. The safest planning habit is to read the latest notice, check the county assessor, and compare the full tax-authority list for the parcel.

FAQ

Quick answers

Is the calculator a filed tax estimate from the county?

No. It is a planning tool. The county assessor and treasurer control actual value, assessed value, mill levies, exemptions, and the final bill.

What if I do not know the total mills?

Look up the parcel on the county assessor or treasurer site, or use Colorado's property tax entities and mill levies map as a starting point.

Do Colorado property taxes reset after a sale?

A sale can matter because the county assessor reviews market value, but Colorado uses actual value, assessment rates, mills, and local district layers.

Sources and review

Where this information comes from

Colorado Porch gives the plain-English version, then points back to official sources for the rule that matters.

Data used: Colorado statewide property-tax guidance and 2025-2026 assessment-rate references
Last reviewed: June 2026

Colorado Division of Property Taxation for statewide overview of assessment, mill levies, tax bills, and protests.
Colorado Division of Property Taxation assessment rates for current assessment-rate tables.
Colorado Property Tax Entities and Mill Levies map for taxing districts, entities, and mill levies by location.

Use this carefully: Colorado property tax depends on the assessor's actual value, the current assessment rate, every overlapping taxing district, and any parcel-specific adjustments. Use this as a planning estimate, then confirm with the county assessor or treasurer.

Next steps

Keep going before you buy

Property tax is only one Colorado-specific check. These three usually belong next to it.

Districts

Metro district guide

Understand the extra district line that can reshape a new-build tax bill.

Read district guide ->

Risk

Wildfire and insurance

Get insurance quotes and mitigation details before deadlines close.

Check wildfire issues ->

Water

Water and wells

Find out what water rights, well permits, or ditch shares actually transfer.

Review water ->