Colorado Property Tax 2026: Post-Gallagher Split Assessment Rates, Senior Exemption & County Rate Comparison

How Colorado Property Tax Works in 2026

Colorado levies no state-level property tax — counties, cities, school districts, and special taxing districts each set and collect their own mill levies locally, and the resulting bills are among the lowest effective property tax rates in the country: roughly 0.39% to 0.50% of home value statewide depending on the source (Tax Foundation cites approximately 0.50%; county-level aggregators put the state average closer to 0.39%), well below the national average of roughly 0.9%–1.0%. But the mechanics behind that low rate have been in genuine flux since 2020, and anyone researching Colorado property tax needs to understand why.

For nearly 40 years, the Gallagher Amendment (1982) locked residential property into paying a fixed 45% share of the statewide property tax base relative to commercial property's 55% share, automatically recalculating the residential assessment rate every two years to maintain that ratio as home values rose faster than commercial values. Colorado voters repealed Gallagher in November 2020 via Amendment B, freezing the rates at their then-current levels (7.15% residential, 29% non-residential) and handing the legislature direct control going forward. What followed was a wave of legislative intervention — SB22-238, a November 2023 special session bill (SB23B-001), and then SB24-233 combined with the August 2024 special session bill HB24B-1001 — responding to sharp home-value increases across the state. The result, current for the 2026 tax year, is a genuinely unusual split assessment system: residential property is assessed at one rate for local governments and a different, higher rate for school districts, plus a new statutory cap limiting how fast most local governments' total property tax revenue can grow year to year. This guide explains the current 2026 assessment mechanics, the senior and disabled veteran exemption programs, how real county rates compare, and a worked example for a home in Denver County. Because this area has changed multiple times in just the last few years, always confirm your specific county's current mill levies directly with your county assessor before relying on any rate here for a financial decision.

The Gallagher Amendment Repeal: Why Colorado's System Changed

Understanding Colorado property tax in 2026 requires understanding what came before it. From 1982 until 2020, the Gallagher Amendment to the Colorado Constitution required that residential property statewide contribute roughly 45% of total property tax revenue while non-residential (commercial, industrial) property contributed the remaining 55% — a fixed ratio. Because residential values across Colorado rose faster than commercial values for decades, the state's Legislative Council was required to recalculate and lower the residential assessment rate every two years to hold that 45/55 split, pushing the residential rate down from an original 21% in 1982 to just 7.15% by 2020.

Why Voters Repealed It

By the late 2010s, Gallagher's mechanical recalculation was creating real problems, particularly for rural counties and special districts (fire, ambulance, hospital) where non-residential value was scarce — the automatically falling residential rate was starving these districts of revenue even as home values (and therefore actual home values) climbed. Colorado voters repealed Gallagher via Amendment B in the November 2020 election by a 58%–42% margin. The companion statute, SB20-223, froze the assessment rates at their then-current levels — 7.15% residential and 29% non-residential — removing the automatic ratio mechanism and leaving future rate-setting entirely to the legislature.

What Happened Next

Freed from Gallagher's automatic downward pressure on the residential rate, but facing a historic run-up in home values from 2020–2023, the legislature intervened repeatedly: SB22-238 provided temporary relief, a rare November 2023 special session produced SB23B-001 after a statewide ballot measure to cap value growth failed, and then SB24-233 in the 2024 regular session — followed by yet another special session in August 2024 (HB24B-1001) — set the current multi-year framework, including the split local-government/school-district rate structure and the 5.5% local revenue growth cap described in the next section. In short: Colorado's residential assessment rate has been legislatively adjusted at least five separate times since Gallagher's repeal, and further adjustment before 2027 is plausible — always verify the current-year rate rather than relying on a prior year's figure.

2026 Assessment Rates: The Split Local Government / School District System

Since the 2025 tax year, Colorado applies two different assessment rates to the same residential property depending on which taxing entity is levying the tax — a structure that doesn't exist in most other states and can be genuinely confusing on a first read of your tax bill.

Local Government Rate: 6.8%, After a Value Reduction

For property tax year 2026, taxes levied by local governments other than school districts (counties, cities, fire districts, water districts, and most special districts) use a residential assessment rate of 6.8% — but only after first reducing the property's actual value by 10%, capped at a maximum reduction of $70,000. In practice: take your home's actual (market) value, subtract 10% of that value up to a $70,000 cap, then multiply the result by 6.8% to get the assessed value used for local government mill levies.

School District Rate: 7.05%, on Full Value

Taxes levied by school districts use a separate, slightly higher rate of 7.05%, applied directly to the property's full actual value with no $70,000 reduction. Since school district mill levies typically make up the largest single component of a Colorado property tax bill, this distinction meaningfully affects the total.

Why Two Rates Exist

The split system was designed to direct more relief toward non-school local governments (which don't have the same state backfill mechanisms schools do) while limiting the revenue impact on school funding, which the state partially backstops through its School Finance Act formula. Both 2026 rates are subject to a small downward adjustment (–0.1%) if statewide actual value growth exceeded 5% between the relevant assessment periods, with the final determination made by the State Board of Equalization.

Non-Residential Property: 25–26%

Commercial, industrial, and most other non-residential property is assessed at 26.0% of actual value for most classes, with commercial-improved property and agricultural property assessed at 25.0% — both well below Gallagher's old frozen 29% rate, reflecting a series of post-2021 legislative reductions aimed at commercial relief alongside the residential changes.

The 5.5% Local Government Revenue Growth Cap

Beyond adjusting assessment rates, SB24-233 introduced a second, structurally different form of relief starting with the 2025 tax year: a statutory cap on how fast most local governments' total property tax revenue can grow, independent of what happens to individual assessed values.

How the Cap Works

For most non-home-rule local governmental entities other than school districts, total property tax revenue collected in a given year is capped at the prior base year's qualified property tax revenue increased by no more than 5.5% per year, compounding for each year since the base year. If total assessed value across a jurisdiction grows faster than 5.5% in a given year — which has been common given recent home-value appreciation — the affected taxing entities are required to lower their mill levy so that total collected revenue doesn't exceed the capped amount, rather than collecting a windfall simply because property values rose.

What This Means for Your Bill

The revenue cap works in the opposite direction from the assessment-rate reduction: it protects taxpayers collectively within a jurisdiction from a local government's total tax take growing faster than 5.5% a year, but it does not guarantee any individual homeowner's bill grows by no more than 5.5% — if your specific property's value rose faster than the jurisdiction's average, your bill can still rise faster than 5.5%, and a neighbor whose value rose slower can see their bill grow less or even fall, as the mill levy is adjusted downward for everyone within the district.

Exceptions

The cap doesn't apply to school districts (which have a separate state funding mechanism) or to certain home-rule municipalities and special districts with voter-approved revenue changes (a "de-Bruced" or de-TABOR'd exemption, referencing Colorado's separate Taxpayer's Bill of Rights). Because both the cap's mechanics and which specific districts are exempt can be technical, confirm how it applies to your specific taxing jurisdictions with your county assessor or treasurer.

Senior and Disabled Veteran Property Tax Exemptions

Colorado offers two parallel exemption programs, both structured identically — 50% of the first $200,000 of a home's actual value is exempted from tax — but with different eligibility paths.

Senior Property Tax Exemption

To qualify for the 2026 tax year, at least one owner must have been born on or before January 1, 1961 (i.e., turning 65 or older), and must have both owned and continuously occupied the home as their primary residence since before January 1, 2016 (a 10-year residency requirement). Qualifying homeowners have 50% of the first $200,000 of their home's actual value exempted from tax — a maximum exemption value of $100,000 — and the State of Colorado directly reimburses the affected taxing entities for the exempted amount, rather than shifting the cost onto other local taxpayers.

Disabled Veteran Exemption

Veterans with a 100% permanent, service-connected disability rating from the VA (or an individually-unemployable rating) qualify for the identical 50%-of-first-$200,000 exemption on their primary residence, without the senior program's 10-year ownership requirement — only that the veteran owned and occupied the home as of January 1 of the application year. Both an eligible senior and an eligible disabled veteran in the same household cannot double the benefit; only one exemption applies per property.

How to Apply

Unlike some states' automatic homestead relief, Colorado's senior and veteran exemptions require an affirmative application filed with your county assessor. The senior exemption deadline is July 15 (late applications accepted through August 15 in most counties), while the disabled veteran exemption application window runs January 1 through July 1 of the qualifying year, filed through the county assessor in coordination with the Colorado Department of Military and Veterans Affairs, which certifies the disability rating. Once approved, homeowners generally don't need to reapply annually unless their qualifying status changes.

Funding Is Not Constitutionally Guaranteed

Because the senior exemption is funded through annual state budget appropriations rather than a permanent constitutional mandate, the Colorado General Assembly has, in past budget-tight years, discussed reducing or suspending funding for the program — it has continued to be funded and applied for the 2026 tax year, but this is a program to double-check each year rather than assume is permanently locked in.

County Property Tax Rates Compared

Because Colorado's 64 counties, along with overlapping cities, school districts, and special districts, each set their own mill levies independently — and because 2026's revenue cap and split assessment rates apply uniformly on top of that local variation — effective rates still differ meaningfully across the state. The figures below are approximate effective rates compiled from property-data aggregators rather than a single official statewide per-county ranking, since Colorado's Division of Property Taxation does not publish a single ranked table of county effective rates.

Approximate Effective Property Tax Rates — Major Colorado Counties (2026)

Why Douglas and Boulder Run Higher Than Denver

Douglas County's higher effective rate largely reflects its heavy reliance on special districts (metro districts funding new suburban infrastructure) layered on top of standard county, city, and school levies, while Boulder's reflects strong school and open-space bond levies. Denver, by contrast, benefits from a large, dense commercial and high-value residential tax base relative to its service area, which — combined with the residential assessment reductions — helps hold its effective rate below several of its suburban neighbors despite Denver's high median home values.

Mill Levies Add On Top of Assessed Value

Remember that your assessed value (actual value run through the 6.8%/7.05% split rates) is only half the calculation — your specific parcel's combined mill levy from its county, city or town, school district, and any special districts (fire, water, metro, RTD, library, etc.) determines the rate applied to that assessed value. Two homes of identical value a few blocks apart, but in different special-district boundaries, can have noticeably different bills — always check your specific parcel's certified mill levy with your county assessor or treasurer, not just a county-wide average.

Worked Example: $550,000 Home in Denver County

This example walks through Colorado's full 2026 calculation chain — actual value, the split local government/school assessment rates, and an illustrative combined rate — for a home near Denver's 2026 median value range.

Step 1: Start With Actual (Market) Value

Assume this home's county-assessed actual value is $550,000.

Step 2: Calculate the Local Government Assessed Value

Reduce actual value by 10%, capped at $70,000: 10% of $550,000 = $55,000 (under the $70,000 cap, so the full $55,000 reduction applies).

$550,000 − $55,000 = $495,000 reduced value

$495,000 × 6.8% = $33,660 local-government assessed value

Step 3: Calculate the School District Assessed Value

No reduction applies for schools — the full actual value is used:

$550,000 × 7.05% = $38,775 school-district assessed value

Step 4: Apply an Approximate Combined Effective Rate

Rather than summing dozens of individual mill levies (which vary by specific parcel within Denver's city, school, and special-district boundaries), applying Denver County's approximate effective rate of ~0.44%–0.45% directly to the $550,000 actual value gives a reasonable cross-check:

$550,000 × 0.445% ≈ $2,448 per year

Reading This Together

This estimate reflects Denver's typical combined city, school, and special-district mill levies applied against the split assessed values calculated in Steps 2–3 above. Your actual bill depends on your specific parcel's certified actual value (available from the Denver Assessor's online property search), the exact combined mill levy for your specific school district attendance zone and any special districts covering your property (metro districts in particular can add substantially to a bill in newer developments), and whether you qualify for the senior or disabled veteran exemption, which would reduce the taxable actual value by up to $100,000 before either assessment rate is applied.