Moving From Colorado Tax Guide 2026: 4.4% Flat Rate, TABOR Rebates & Residency Rules

Colorado's flat 4.4% income tax rate positions it as a mid-range state for income tax burden — higher than no-income-tax states like Nevada and Wyoming, but significantly lower than California, New York, or Oregon. Colorado is most commonly discussed as a departure destination (people moving to Colorado) rather than a departure origin — but high earners in Denver's tech and energy sector, and retirees on fixed incomes, do leave for lower-tax states.

Colorado's TABOR (Taxpayer's Bill of Rights) is a unique constitutional mechanism that limits state revenue growth and requires rebates to taxpayers when revenues exceed the cap — a feature no other state has. This guide covers Colorado's tax structure, residency rules, and the departure year picture.

Colorado Residency: Domicile Test and Departure

Colorado uses a domicile-based residency test. Like Maryland and Minnesota, there is no Colorado equivalent of New York's statutory 183-day + maintained dwelling rule. Changing Colorado domicile terminates Colorado income tax residency.

Colorado Domicile Test

Colorado is your domicile if it is your fixed, permanent home with intent to return after any absence. To change Colorado domicile: (1) Establish a genuine primary home in the destination state — purchase or establish a long-term residence; (2) Get a new driver's licence and vehicle registration in the new state; (3) Register to vote in the new state; (4) Update professional licences, banking, and insurance to the new address; (5) File Form DR 0104 as a part-year resident in the departure year. Colorado Department of Revenue focuses on where you sleep most nights and where your primary economic and social connections are.

No Colorado Statutory Residency Trap

Colorado does not have a 183-day + maintained dwelling statutory residency rule. If you change your domicile to Nevada or Texas, you are not a Colorado resident even if you keep your Vail ski condo or Boulder investment property. However, spending significant time in Colorado may give Colorado grounds to argue domicile never changed. The safe approach: spend fewer than 183 days in Colorado in the departure year.

Colorado Part-Year Return (Form DR 0104)

File Colorado Form DR 0104 as a part-year resident in the departure year. Colorado taxes worldwide income through your departure date. After departure, Colorado-source income: wages earned for work in Colorado, Colorado rental income, Colorado business income, Colorado real estate gains.

TABOR and Departure Year

Colorado's TABOR rebate is distributed to Colorado residents who file a Colorado return. In the departure year, part-year residents may receive a partial TABOR rebate proportional to their residency period, depending on the mechanism used for distribution. If you depart early in the year, you may miss the annual TABOR rebate for that year — typically a few hundred dollars per filer.

Colorado's Flat Tax, Property Tax, and Retirement Income

Colorado's 4.4% flat rate applies to Colorado taxable income — which starts with federal taxable income and makes Colorado-specific modifications.

Colorado Income Tax: How It Works

Colorado income tax = 4.4% × (federal taxable income + Colorado additions − Colorado subtractions). Key Colorado subtractions: Social Security deduction for age 65+ (full deduction of federally taxable SS), Colorado capital gain subtraction (limited to certain Colorado-source long-term gains), pension/annuity subtraction ($20,000/year for taxpayers age 55–64, $24,000/year for age 65+). The pension subtraction is a meaningful benefit for retirees — at 4.4%, the $24,000 subtraction saves approximately $1,056/year.

Colorado Property Tax: Proposition HH Impact

Colorado's property tax effective rate averaged 0.55% — well below national average. Colorado voters approved Proposition HH (2023), which modified how residential property is assessed to limit rapid increases in assessed values driven by Colorado's surging home prices. The change limits annual assessment increases and provides additional relief for primary residences. On a $600,000 Colorado home at 0.55% effective rate: approximately $3,300/year — compared to $6,000+ in Illinois or $12,000+ in New Jersey for similar-value homes.

Colorado vs Wyoming and Nevada: The Border Move

Colorado residents seeking lower taxes often look at Wyoming and Nevada:

Wyoming and Nevada offer no income tax with comparable property taxes. For a Colorado resident earning $300,000, Wyoming or Nevada saves approximately $13,200/year in state income tax. The trade-off: distance from Colorado's amenities, though Wyoming's proximity to Cheyenne/Denver and Nevada's Las Vegas metro make these practical alternatives for some.