Tools · Seller

Will I owe capital gains on my Colorado home sale?

The Section 121 primary-residence exclusion makes most home sales tax-free. This tool tells you whether yours qualifies, and if not, roughly what federal + Colorado state will take.

Sale pricePurchase price (original)

Capital improvementsRoof, kitchen remodel, addition. Not paint or landscaping.Selling costsCommission, doc fee, title — pull from our net proceeds tool.

Filing status

SingleMarried, jointHead of household

Other taxable income (this year)Drives which federal cap-gains bracket you land in (0/15/20%).Primary residenceLived here at least 2 of the last 5 years. Section 121 lets you exclude up to $250k single / $500k joint.

Estimated tax owed

On a taxable gain of $0.

Total realized gainSale − selling costs − adjusted basis: $356,000
Section 121 exclusionPrimary residence — tax-free: −$356,000
Federal cap gainsMarginal rate ~0%: $0
Colorado state tax4.40% flat: $0
Total tax: $0

Estimate only. State conformity nuances, depreciation recapture (if rented), and 1031 exchanges aren't modeled. Talk to a Colorado CPA before making decisions on real money.

Reading the result

How home-sale capital gains actually work.

Section 121

$250k / $500k of primary-residence gain is tax-free

If you owned and lived in the home as a primary residence for at least 2 of the last 5 years, you can exclude up to $250,000 of gain (single) or $500,000 (married filing jointly) from federal capital gains tax — and Colorado mirrors the federal exclusion. For most Coloradans selling a long-held home, this exclusion wipes the tax bill entirely.

0 / 15 / 20

Federal long-term cap gains is bracketed by your other income

Long-term gains aren't a flat rate. They sit on top of your other taxable income and fall into 0%, 15%, or 20% brackets. A retired couple with $50k of pension income and a $200k taxable gain pays a much lower effective rate than a dual-income tech couple with $400k of W-2 income.

CO 4.40%

Colorado has a flat state tax on the same gain

Colorado conforms to federal rules and applies its 4.40% flat income tax to whatever gain remains taxable after Section 121. There's no separate state-level capital-gains exclusion. High earners may also owe the 3.8% federal Net Investment Income Tax on top — we surface that automatically when income crosses the threshold.

Big gain on the line?

Talk to a Colorado agent before you list.

Timing the sale, separating cost basis records, planning a 1031 exchange — the right agent loops in a CPA before you sign the listing agreement.