How are capital gains taxed in Colorado in 2025?

Colorado has a flat 4.4% income tax that applies to capital gains. On top of that, the federal government taxes long-term gains at 0%, 15%, or 20% (and short-term gains at ordinary rates), and high earners may owe the 3.8% Net Investment Income Tax.

Does the 3.8% Net Investment Income Tax apply?

It can. The NIIT adds 3.8% on the lesser of your net investment income and the amount your modified AGI exceeds $200,000 (single or head of household), $250,000 (married filing jointly), or $125,000 (married filing separately). These thresholds are set by statute and are not adjusted for inflation. This calculator includes it automatically.

Is my data sent anywhere when I use this calculator?

No. All calculations run entirely in your browser using JavaScript. No amounts, inputs, or personal data are ever transmitted to any server.

What is the Colorado Capital Gains Tax 2025 — Federal 0/15/20% + NIIT + State?

Free Colorado capital gains tax calculator for 2025. Applies the federal 0%/15%/20% long-term rates, the 3.8% Net Investment Income Tax, and Colorado's state treatment of capital gains — with your total tax and after-tax gain. Runs entirely in your browser. It runs free in your browser on Gera Tools, with nothing uploaded.

Colorado Capital Gains Tax 2025 — Federal 0/15/20% + NIIT + State

Name: Colorado Capital Gains Tax 2025 — Federal 0/15/20% + NIIT + State
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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Colorado Capital Gains Tax 2025

This calculator works out the total tax on a capital gain in Colorado for the 2025 tax year — the federal 0% / 15% / 20% long-term rate, the 3.8% Net Investment Income Tax for high earners, and the Colorado state portion. Colorado taxes capital gains as ordinary income.

Federal long-term gains (assets held over one year) are taxed at 0%, 15%, or 20% by total taxable income. For 2025 the 0% band runs to $48,350 (single) or $96,700 (married filing jointly), 15% up to $533,400 (single) or $600,050 (joint), and 20% above. Short-term gains are taxed at ordinary federal rates. High earners also owe the 3.8% Net Investment Income Tax (NIIT) on the lesser of the gain and modified AGI over $200,000 (single) / $250,000 (joint) / $125,000 (married filing separately).

Enter your gain, your other taxable income, your filing status and holding period below. Colorado has a flat 4.4% income tax that applies to capital gains. Everything runs in your browser — no amounts or personal data are transmitted.

Estimate, not tax advice. The Colorado portion is modelled at the state’s top marginal rate, so your actual state tax may be lower; local/city taxes and special-rate assets (collectibles, qualified small-business stock, depreciation recapture) are not included. Verify with the IRS and the Colorado tax authority.