Capital Gains Estimator

When you sell an investment for more than you paid, the profit is called a capital gain, and the IRS taxes it. How much tax you owe depends primarily on two factors: how long you held the asset and your ordinary income tax bracket. Understanding the distinction between short-term and long-term capital gains is one of the most important concepts in investment tax planning.

Short-term capital gains apply to assets held for less than one year. These gains are taxed at your ordinary income tax rate, which can range from 10% to 37% depending on your bracket. There is no preferential treatment for short-term gains, so frequent trading can result in a significant tax burden that erodes your investment returns.

Long-term capital gains apply to assets held for one year or longer and receive favorable tax treatment. Most taxpayers pay either 0%, 15%, or 20% on long-term gains. If your ordinary income tax bracket is 12% or below, your long-term capital gains rate is 0%. If your bracket falls between 22% and 35%, you pay 15%. Only taxpayers in the top 37% bracket pay the 20% long-term rate.

This preferential treatment creates a powerful incentive to hold investments for at least one year before selling. The difference between a 22% short-term rate and a 15% long-term rate on a $10,000 gain is $700 in tax savings.

This estimator provides a simplified calculation. It does not account for the Net Investment Income Tax surcharge, state capital gains taxes, or wash sale rules. Consult a tax professional for comprehensive tax planning on investment income.