Colorado property tax is one of the line items investors most often get wrong on a proforma. The base assessment math looks simple, but two things make it surprisingly volatile: the metro-district overlay (which can multiply effective tax by 2–3× on the same street), and a string of recent legislative changes that have shifted residential assessment rates in ways general-purpose investing guides haven't kept up with. This guide walks through what actually matters when you're underwriting a Colorado deal.
How Colorado property tax is calculated
The formula is the same for residential and commercial:
Three inputs, three different sources of variation:
- Actual value — set by the county assessor on the reassessment cycle. This is the assessor's opinion of fair-market value as of the appraisal date.
- Assessment rate — the percentage of actual value that's taxable. This rate is set in state statute and has been adjusted multiple times since the Gallagher Amendment was repealed by Amendment B in 2020. Current residential and commercial rates are published by the Colorado Department of Local Affairs (DOLA), Division of Property Taxation — and because they shift, we deliberately don't hardcode them on this page. Always check the DOLA page for the rate that applies to the tax year you're modeling.
- Mill levy — the sum of mill rates from every taxing authority that touches the parcel: school district, county, city, fire, water, library, and (the kicker) any metro district. Published per parcel on the county assessor's website.
Metro districts — the investor pitfall
This is the single most common reason investors miss on Colorado underwriting. Many newer Front Range master-planned developments are inside one or more metropolitan districts — quasi-governmental special districts that issue bonds to fund infrastructure (roads, parks, water taps) and repay those bonds through additional mills layered on top of the base levy.
Effective property tax inside a metro district can run 2 to 3 times the same property type in a non-metro-district neighborhood a few blocks away. Two identical houses across the street from each other can have wildly different tax bills if one is in a metro district and the other isn't.
Metro districts are listed and mapped by the Special District Association of Colorado. The county assessor's parcel page is the authoritative source — pull up the parcel and read the list of "taxing authorities" or "tax districts." If you see anything beyond county / school / municipality, you're probably looking at a metro district.
Underwriting rule of thumb
Always pull the actual mill levy for the specific parcel from the county assessor — never use a city or county average. The proforma EZ Investments shares with disclosed buyers reflects the per-parcel mill levy, not an estimate.
Reassessment cycles
Colorado reassesses every two years, in odd-numbered years (Colorado Revised Statutes § 39-1-104). The 2025 reassessment values are in effect for tax years 2025 and 2026 — meaning bills paid in 2026 and 2027 are based on values the assessor set as of the 2024 appraisal date.
Notices of Valuation are mailed in May of the reassessment year. If you disagree with the assessor's value, you have until June 8 of the reassessment year to file a written protest under CRS § 39-5-122. Some counties extend the deadline; check the notice. If the assessor denies the protest, you can appeal to the County Board of Equalization (typically July), then to the Board of Assessment Appeals or district court.
Investor-specific federal tax considerations
Depreciation
Residential rental property is depreciated over 27.5 years using the straight-line method (IRS Publication 527). Commercial is 39 years. Land is not depreciable — you depreciate the building only, so allocate the purchase price between land and improvements at acquisition. The county assessor's land-vs-improvements split is a defensible starting point.
Depreciation reduces taxable rental income each year. When you sell, the IRS recaptures depreciation at a special 25% federal rate under IRC § 1250, separate from your ordinary capital gains rate. This is one of the biggest reasons the after-tax return on a long-held rental can be lower than the spreadsheet suggests — the recapture is real.
Section 1031 exchanges
A 1031 exchange (under Internal Revenue Code § 1031) lets you defer capital gains and depreciation recapture by reinvesting sale proceeds into a like-kind property within strict timelines (45 days to identify, 180 days to close). 1031s are an investor staple; the rules are technical and the deadlines are unforgiving. You will need a qualified intermediary (QI) — the seller cannot touch the proceeds. A 1031-specialized CPA or QI is worth their fee. We're not 1031 specialists; talk to one before structuring a deal around it.
Property tax is fully deductible against rental income
On a rental property, Colorado property taxes are deductible as a business expense on Schedule E (per IRS Publication 527). The federal SALT cap (which limits the personal property tax deduction to $10,000 on Schedule A) does not apply to rental property — rental expense isn't subject to the cap.
Capital gains on sale
Held less than a year: short-term capital gains, taxed at ordinary income rates. Held more than a year: long-term capital gains (federal 15% or 20% depending on bracket, plus 3.8% NIIT for high earners). Plus depreciation recapture at 25%. Plus Colorado's flat state income tax on the gain. Run the after-tax math before assuming a high-IRR deal nets what the spreadsheet says.
Two relevant Colorado exemptions
Both apply to the property's occupant, not the investor. Worth knowing because they may affect tenant decisions (exemption figures current as of 2026):
- Senior Homestead Exemption — 50% of the first $200,000 of actual value is exempt from property tax for owner-occupants 65+ who have lived there 10+ years. Authorized by CRS § 39-3-203.
- Disabled Veteran Exemption — same structure, for disabled veterans with a 100% service-connected disability rating. Same statute.
If you're buying a property whose previous owner-occupant claimed one of these exemptions, the exemption ends with the sale — the new tax bill will reflect the full assessed value. Don't model the seller's tax bill into your proforma without removing the exemption.
Recent legislative changes — a moving target
Colorado property tax has been one of the most-debated areas of state policy since Gallagher was repealed in 2020. There have been multiple ballot measures (Proposition HH in 2023 failed at the polls), legislative bills (SB22-238, SB23-001, SB23-303, and follow-ups), and special sessions addressing assessment rates and TABOR refund mechanics. Specifics change too fast to summarize reliably; for the current state of the law, the authoritative source is the Colorado General Assembly. For applied guidance on what's in effect this year, check the DOLA Division of Property Taxation.
What this means for cash-buyer investors working with EZ Investments
When EZ Investments presents an off-market deal to disclosed buyers, the proforma uses the actual mill levy from the county assessor for that specific parcel — not a city or county average. That includes any metro district overlay. We surface metro-district status as a line item, not buried in the footnotes. If a parcel is in a high-mill metro district, the deal needs to clear a higher cap-rate bar to make sense; we'd rather you see that up front.
For investors underwriting their own deals: pull the parcel page from the county assessor before you make an offer, every time. Two minutes of work catches a 2× tax surprise.
Frequently asked questions
How do I look up a Colorado property's mill levy?
Every county assessor publishes mill levy data on their website, usually keyed by parcel ID or address. For Front Range investors: Denver County Assessor (denvergov.org/assessor), Adams County (adcogov.org), Arapahoe County (arapahoegov.com/assessor), Douglas County (douglas.co.us/assessor), and Larimer County (larimer.gov/assessor). The county pages will list every taxing authority that applies to the parcel — including any metro district levies, which are the ones that surprise investors.
What's the deadline to protest a Colorado property tax assessment?
Colorado reassesses every two years (odd-numbered years) and mails Notices of Valuation in May. Under Colorado Revised Statutes Section 39-5-122, owners typically have until June 8 of the reassessment year to file a written protest with the county assessor. Some counties extend the deadline; check the notice. After June, you can appeal to the County Board of Equalization through July, and to the Board of Assessment Appeals or district court after that.
Are there tax incentives for Colorado real estate investors?
A few. Federal Opportunity Zone benefits apply to designated Colorado census tracts (defer and reduce capital gains by reinvesting in OZ funds; talk to a CPA). The State Historic Preservation Tax Credit covers qualified rehab on listed historic properties. Some counties offer modest abatements for affordable-housing developments. Most investor-relevant tax benefits, though, are federal — depreciation, 1031s, mortgage interest deduction — not Colorado-specific.
Why is my Colorado property tax bill different from a similar property a few blocks away?
Almost always it's a metro district. Many newer Front Range master-planned developments are inside metro districts that levy their own mills on top of the base school + county + city rates. Effective property tax inside a metro district can run 2 to 3 times the surrounding neighborhood. The county assessor's parcel page lists every taxing authority that applies — verify before underwriting.
Can I deduct Colorado property taxes on a rental property?
Yes — property taxes on rental property are fully deductible against rental income on Schedule E. This is true at the federal level under IRS Publication 527; it doesn't have a SALT cap because it's a business expense, not an itemized personal deduction. Keep payment records and consult a Colorado CPA at tax time.
Related reading
- The BRRRR Strategy in Colorado
- How to Evaluate an Investment Property
- Denver Neighborhoods Guide
- Join the EZ Investments Cash Buyers List