Interactive Tools
Capital Gains Tax Calculator
Free capital gains tax calculator: estimate federal and state capital gains tax, including NIIT, for Texas and all 50 states in a few seconds.
Capital gains tax is calculated on your profit — sale price minus cost basis. If you held the asset more than one year the gain is long-term, taxed federally at 0%, 15% or 20% depending on taxable income and filing status. Held one year or less, it is short-term and taxed as ordinary income. Modified adjusted gross income above $200,000 single or $250,000 married filing jointly adds the 3.8% Net Investment Income Tax. State tax is applied last; Texas has none.
Gain = Sale price − Cost basis Total tax = (Gain × federal rate) + (Gain × 3.8% NIIT, if applicable) + (Gain × state rate)The figures below are an estimate for educational purposes. Confirm your own numbers with your CPA or tax advisor before acting.
Frequently Asked Questions
Common Questions
How is capital gains tax calculated?
Long-term capital gains (assets held more than one year) are taxed at federal rates of 0%, 15%, or 20% depending on your taxable income and filing status. Short-term gains are taxed as ordinary income. High earners may also owe the 3.8% Net Investment Income Tax (NIIT), plus any applicable state tax. This calculator estimates all of these based on the figures you enter.
Does Texas have a state capital gains tax?
No. Texas has no state income tax, which means no state tax on capital gains. An investor with the same gain in a high-tax state like California could owe over 13% in additional state tax. This is a meaningful advantage for Texas residents.
What is the Net Investment Income Tax (NIIT)?
The NIIT is a 3.8% federal surtax on net investment income for individuals with modified adjusted gross income above $200,000 (single) or $250,000 (married filing jointly). It applies on top of ordinary capital gains rates and is a common surprise for higher-income investors.