Capital Gains Tax Estimator
Estimate capital gains tax on investments (short vs long-term rates).
📈 US capital gains: held 1+ year = long-term (0/15/20%). Held <1 year = short-term (ordinary income rate). Simplified — excludes NIIT and state tax.
What Is This Tool?
When you sell an investment for more than you paid, the profit is a capital gain and is taxed. How long you held the asset dramatically changes the rate. This estimator applies US federal rules.
Short vs. Long Term
- Short-term (<1 year): Taxed as ordinary income (your marginal rate, 10-37%)
- Long-term (1+ years): Preferential rates of 0%, 15%, or 20% depending on income
Why Holding Period Matters
The difference is huge. A $10,000 gain in the 24% bracket: short-term costs $2,400 in tax; long-term costs $1,500 (a 37% tax saving). For high earners near the top bracket, holding 1+ years can save thousands.
What's Not Included
- NIIT: 3.8% surtax on investment income for high earners
- State tax: Varies 0-13% depending on state
- Capital losses: Can offset gains dollar-for-dollar
- Tax-loss harvesting: Strategic loss-taking to reduce taxes
Frequently Asked Questions
How do I calculate my capital gains tax?
Track purchase and sale prices per lot. Gains = sale − purchase − fees. Long-term gains are taxed at 0/15/20% based on your total taxable income (including the gain itself).
About the Capital Gains Tax Estimator
The Capital Gains Tax Estimator lets you figure out capital gains taxinstantly, without reaching for a spreadsheet or doing the math by hand. Whether you're planning a budget, checking a loan, or working through homework, the tool applies the correct formula behind the scenes and shows the result the moment you enter your numbers.
Unlike a static chart or table, this calculator adapts to your exact inputs. You can adjust any value and see the outcome update in real time, which makes it easy to compare scenarios — for example, "what if the rate were 1% lower?" or "what if I paid an extra $50 a month?"
How to Use This Tool
- Enter the main values the calculator asks for (for example, amount, rate, and time).
- Pick the right unit or option where the tool offers a choice.
- Read the result, which appears instantly below the inputs.
- Adjust any field to test a different scenario — the answer updates without a reload.
- Copy or note the result. Nothing is stored, so close the tab when you're done.
Why Use an Online Calculator?
Browser-based tools like this one have a few real advantages over installed software or manual methods:
- No installation. It opens instantly in any browser, on any operating system.
- Private by default. Everything runs locally, so your data stays on your device.
- Always up to date.There's nothing to update — you always get the latest version when you load the page.
- Free and unlimited. Use it as often as you like, with no account and no caps.
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