The Colorado capital gains tax is not a separate tax at all. The state folds capital gains into ordinary income and taxes them at its flat rate of 4.4%, which sits on top of whatever you owe the federal government. For a long-term gain, that usually means 15% or 20% federally, plus the 4.4% to Colorado, and possibly another 3.8% in Net Investment Income Tax if your income is high enough. A top-bracket Colorado resident can end up at a combined rate of 28.2% on a long-term gain.
Colorado’s Flat Rate on Capital Gains
Colorado has no preferential rate for long-term gains, no separate schedule for investment income, and no distinction between wages and gains at the state level. Everything flows into state taxable income and is taxed at 4.4%, the flat rate voters set under Proposition 121 in November 2022.1Colorado General Assembly. Proposition 121 State Income Tax Rate Reduction
The rate can dip below 4.4% in years when state revenue exceeds constitutional spending limits under TABOR. That happened in tax year 2024, when the effective rate dropped to 4.25%. For 2025 the rate returned to 4.4%, and unless a temporary adjustment is announced, 4.4% is the base for 2026 as well.2Colorado Department of Revenue. Individual Income Tax Guide These adjustments are tied to revenue figures that aren’t finalized until the year is underway, so confirm the current rate with the Department of Revenue before you file.
How Federal Rates Stack on Top
Your federal tax depends on how long you held the asset. Sell after a year or less, and the gain is taxed as ordinary income at your regular federal bracket. Hold longer than a year, and the gain qualifies for long-term rates of 0%, 15%, or 20% depending on your taxable income.3Internal Revenue Service. Topic No. 409, Capital Gains and Losses
A married couple selling a rental with $200,000 of long-term gain in the 15% federal bracket would pay 15% to the IRS and 4.4% to Colorado, a combined 19.4% before any other surcharges.
High earners then face the Net Investment Income Tax, an extra 3.8% federal surtax on capital gains. The NIIT applies to whichever is smaller: your net investment income, or the amount by which your modified adjusted gross income exceeds $200,000 for single filers or $250,000 for joint filers.4Internal Revenue Service. Topic No. 559, Net Investment Income Tax Those thresholds have not been adjusted for inflation since the tax took effect in 2013, so they pull in more taxpayers every year. When the NIIT applies at the top federal bracket, a Colorado resident’s combined rate on a long-term gain reaches 28.2%.
The Colorado Capital Gains Subtraction: Farmers Only
Colorado does have a capital gains subtraction that reduces state taxable income, but for tax years 2022 and later it is available only to farmers selling agricultural real property. Tangible personal property, ordinary residential or commercial real estate, and stock in Colorado companies no longer qualify.5Colorado Department of Revenue. Income Tax Topics – Colorado Capital Gain Subtraction If you’re a typical investor or homeowner, this subtraction won’t help you, and Colorado offers no other state-level exclusion in its place.
To claim the subtraction, all of the following must be true:
- You file federal Schedule F.
- The real property is classified as agricultural land for Colorado property tax purposes. If the sale is part of a larger package, at least 75% of the real property must be agricultural land.
- You acquired the property on or after May 9, 1994.
- You owned it for at least five uninterrupted years.
- The property is located in Colorado.
Even when everything lines up, the subtraction is capped at $100,000 of qualifying gain per tax year, worth up to $4,400 in state tax at the 4.4% rate.6Justia. Colorado Revised Statutes Title 39, Section 39-22-518 – Tax Modification for Net Capital Gains The provision is scheduled to be repealed on December 31, 2030.
Selling a Home in Colorado
The biggest tax break for someone selling a Colorado primary residence comes from federal law, not state law. Under Section 121 of the Internal Revenue Code, if you owned and lived in your home for at least two of the five years before the sale, you can exclude up to $250,000 of gain, or up to $500,000 if you’re married filing jointly and both spouses meet the use requirement.7Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence Colorado has no separate state exclusion, but because state taxable income starts from federal taxable income, any gain excluded under Section 121 is also excluded from Colorado tax.
In hotter Colorado markets, appreciation on a long-held home can outrun the exclusion. Anything above $250,000 (or $500,000 for a couple) is taxable at both the federal and state level.
Nonresident Sellers
If you live outside Colorado and sell Colorado real property valued at $100,000 or more, the buyer or closing agent is required to withhold a portion of the sale price against your anticipated state tax.8Colorado Department of Revenue. DR 1083 – Information With Respect to a Conveyance of a Colorado Real Property Interest You reconcile the withholding by filing a Colorado nonresident return after year-end. Sellers who aren’t expecting this often see a chunk of their proceeds held back at closing.
Investment Property and 1031 Exchanges
Rental and commercial property sales get no automatic exclusion, and the full gain is taxable federally and in Colorado. A 1031 like-kind exchange lets you defer the gain by rolling the proceeds into another investment property.9Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment You must identify replacement property within 45 days of the sale and close within 180 days, with no extensions even if a deadline falls on a weekend or holiday. Both properties must be real property held for business or investment; a rental for a personal vacation home doesn’t qualify. Because Colorado piggybacks on federal taxable income, a valid 1031 exchange defers the state tax along with the federal.
Inherited Assets Versus Lifetime Gifts
Assets inherited at death generally receive a stepped-up basis equal to fair market value on the date of death. If a parent bought stock for $50,000 that was worth $300,000 when they passed, the heir’s basis becomes $300,000 and the accumulated $250,000 of gain disappears for tax purposes.10Internal Revenue Service. Gifts and Inheritances Colorado follows the federal step-up, and Colorado imposes no state estate or inheritance tax of its own.
Lifetime gifts work differently. The recipient takes your original cost basis, not the current market value. Gift shares you bought for $10,000 that are now worth $80,000, and the recipient owes tax on the full $70,000 of appreciation when they sell. For highly appreciated assets, holding until death usually produces the better tax result, though income shifting to heirs in lower brackets can flip that calculus in specific cases.
Qualified Small Business Stock
Colorado conforms to the federal Section 1202 exclusion for qualified small business stock. QSBS issued by a qualifying C corporation with gross assets under $50 million can produce a full exclusion of the gain from both federal and Colorado tax. For stock acquired before July 4, 2025, the exclusion is 100% after a five-year hold. For stock acquired on or after that date, the exclusion phases in:
- Three-year hold: 50% exclusion
- Four-year hold: 75% exclusion
- Five-year hold: 100% exclusion
Small structural missteps at the entity level can disqualify the exclusion, so founders and early employees of Colorado startups should verify QSBS status well before an exit.
Ways to Reduce Your Capital Gains Tax
Several strategies work reliably for Colorado taxpayers.
Hold past the one-year mark. An investor in the 32% federal bracket who sells one day too early pays 32% federally instead of 15%, turning a $100,000 gain from a $19,400 combined bill into a $36,400 one.
Harvest losses. Realizing losses to offset gains works dollar for dollar at both the federal and Colorado level. Losses beyond gains can offset up to $3,000 of ordinary income per year, with the rest carried forward indefinitely.3Internal Revenue Service. Topic No. 409, Capital Gains and Losses Watch the wash sale rule: buying a substantially identical security within 30 days before or after the sale disallows the loss.
Use tax-advantaged accounts. Gains inside traditional IRAs and 401(k)s aren’t taxed until withdrawal, and gains inside Roth accounts avoid tax entirely when distributions are qualified.
Split large sales across tax years. If you control the timing, closing part of a sale in December and part in January (or using an installment sale) can keep you in lower federal brackets in both years and may keep you under the NIIT threshold.
Convert a rental to a primary residence. Living in a former rental for two of the five years before sale can unlock the Section 121 exclusion, though depreciation recapture still applies to any depreciation claimed during the rental period.7Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence
Estimated Payments and Filing Deadlines
A large sale mid-year can create a nasty bill in April if you haven’t paid estimated taxes along the way. Colorado’s safe harbor is 70% of the current year’s actual liability, or 100% of the prior year’s liability if your federal AGI was $150,000 or less. Above that AGI, the prior-year figure rises to 110%.11Cornell Law School. Colorado Regulation 39-22-605 – Estimated Individual Income Tax
Federal safe harbors work similarly: 90% of the current year’s tax or 100% of the prior year’s tax, rising to 110% if your prior-year AGI exceeded $150,000.12Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty The federal underpayment interest rate for the first quarter of 2026 is 7% per year, compounded daily.13Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
Colorado returns are due April 15, aligned with the federal deadline. The state grants an automatic six-month extension to October 15 without any paperwork, but the extension only covers filing. You still need to pay at least 90% of your liability by April 15 to avoid penalties and interest.14Colorado Department of Revenue. Individual Income Tax Due Dates and Filing Extension If you sold a large asset late in the year, a fourth-quarter estimated payment by January 15 reduces the penalty for that quarter, though it doesn’t undo missed payments from earlier in the year.