Finance calculators

Capital Gains Tax Calculator

Updated Sep 11, 2026 By Infinity Calculator
Rate Formulas Sources
Capital Gains Details
$75,000
$50,000
$120,000
State rate: 13.30%

Tax Estimate Summary

Total Capital Gain
$70,000
Total Tax Owed
$18,417
Effective Tax Rate
26.31%
Net Proceeds
$101,583
Federal Tax
$10,500
State Tax
$9,310
NIIT (3.8%)
$0
Depreciation Recapture Tax
$0
Detailed Tax Breakdown
Gross Gain/Loss$70,000
Adjustments (Improvements)−$0
Selling Costs−$0
Capital Losses Offset−$0
Net Taxable Gain$70,000
Federal Capital Gains Tax$10,500
Net Investment Income Tax (NIIT)$0
Depreciation Recapture Tax (max 25%)$0
State Capital Gains Tax$9,310
Total Tax$19,810
Short-Term vs. Long-Term Comparison
Short-Term (< 1 Year)
Federal Tax$16,408
State Tax$9,310
NIIT$0
Total Tax$25,718
Effective Rate36.74%
Net Proceeds$94,282
LT Savings
$5,908
8.44% less tax
Long-Term (> 1 Year)
Federal Tax$10,500
State Tax$9,310
NIIT$0
Total Tax$19,810
Effective Rate28.30%
Net Proceeds$100,190
Tax Composition
Proceeds Breakdown
Federal Tax Bracket Application
Bracket Rate Taxable in Bracket Tax from Bracket
State Capital Gains Tax Rates Reference
StateRateNotes

Introduction

When you sell an asset like stocks, real estate, or other investments for more than you paid, the profit you make is called a capital gain. The government taxes this profit, and the amount you owe is known as capital gains tax. How much tax you pay depends on a few key things: how long you held the asset, your income level, and your tax filing status. Assets held for more than one year are taxed at lower long-term rates, while assets held for one year or less are taxed at higher short-term rates, which match your regular income tax bracket.1

This Capital Gains Tax Calculator helps you quickly estimate how much tax you may owe on the sale of an asset. Enter your purchase price, sale price, holding period, and income details, and the calculator gives you your capital gains tax. Knowing your potential tax bill ahead of time can help you make smarter decisions about when to sell and how to plan your finances.

How to Use Our Capital Gains Tax Calculator

Enter details about your investment sale below to find out how much you owe in capital gains tax.

Purchase Price: Type in the total amount you paid when you first bought the asset. This is also called your cost basis.

Sale Price: Enter the total amount you received when you sold the asset. This is the final selling price before any taxes.

Holding Period: Choose whether you held the asset for more than one year (long-term) or one year or less (short-term). Long-term gains are usually taxed at a lower rate than short-term gains.

Filing Status: Select your tax filing status, such as single, married filing jointly, married filing separately, or head of household. Your filing status affects which tax bracket you fall into.

Annual Income: Enter your total taxable income for the year, not counting the capital gain. This helps the calculator figure out the correct tax rate for your gain.

State: Select the state where you live. Some states charge their own capital gains tax on top of the federal tax, while others do not.

What Is Capital Gains Tax?

Capital gains tax is a tax you pay on the profit you make when you sell an asset for more than you paid for it. Assets can include stocks, bonds, real estate, or other investments. The "gain" is simply the difference between your sale price and your purchase price (also called your cost basis). If you sell something for less than you paid, that's called a capital loss, and you generally don't owe tax on it. In fact, you can use losses to offset other gains.

Short-Term vs. Long-Term Capital Gains

How long you hold an asset before selling it makes a big difference in how much tax you owe. If you own an asset for one year or less before selling, your profit is a short-term capital gain. Short-term gains are taxed at the same rates as your regular income.1 For 2026 the top federal rate is 37%.2 If you hold the asset for more than one year, your profit is a long-term capital gain. Long-term gains get special, lower tax rates of 0%, 15%, or 20%, depending on your total taxable income and filing status. This is why holding an investment for more than one year before selling can save a significant amount in taxes: the IRS counts a gain as long-term only when you hold the asset for more than one year.1

How Federal Capital Gains Tax Rates Work

Long-term capital gains tax rates are based on your taxable income. For the 2025 tax year, a single filer pays 0% on long-term gains if their taxable income (including the gain) is $48,350 or less.1 The 15% rate applies to income between $48,350 and $533,400, and the 20% rate kicks in above $533,400.1 For 2026 those limits are $49,450 and $545,500.3 These thresholds change based on your filing status. Married couples filing jointly get wider brackets, while married individuals filing separately get narrower ones. The brackets also adjust slightly each year for inflation.

Net Investment Income Tax (NIIT)

On top of regular capital gains tax, high-income earners may owe an additional 3.8% Net Investment Income Tax.4 This tax applies when your modified adjusted gross income exceeds $200,000 for single filers, $250,000 for married couples filing jointly or $125,000 for married people filing separately.4 The NIIT is charged on the lesser of your net investment income or the amount by which your income exceeds the threshold.4 It applies to both short-term and long-term gains.

State Capital Gains Taxes

Most states tax capital gains as regular income. State rates vary widely, from 0% in states like Florida, Texas, Nevada, and Wyoming (which have no state income tax) to as high as 13.3% in California. A few states have unique rules. For example, Washington charges a 7% tax on long-term gains above a standard deduction of $278,000 for 2025, and real estate is exempt.5 Massachusetts taxes short-term gains at 8.5% and long-term gains at 5%.6 Your state of residence can have a major impact on your total tax bill, so it's important to factor in state taxes when planning a sale.

Adjustments That Reduce Your Taxable Gain

Several adjustments can lower the amount of capital gains you actually owe tax on:

  • Improvements: Money you spent on capital improvements (like home renovations) gets added to your cost basis, which reduces your gain.7
  • Selling costs: Broker commissions, closing costs, and other fees related to the sale are subtracted from your proceeds.
  • Capital losses: Losses from other investment sales in the same year can offset your gains dollar-for-dollar. If your losses exceed your gains, you can deduct up to $3,000 of the excess against ordinary income and carry the rest forward to future years.1

Depreciation Recapture

If you claimed depreciation deductions on an asset (most commonly rental property), you may owe depreciation recapture tax when you sell. The portion of your gain that equals the depreciation you previously claimed is taxed at a maximum federal rate of 25%.1 The calculator taxes that portion at your ordinary income rates, capped at 25%. This recapture amount is calculated before the remaining gain is taxed at the normal long-term rates.

Tips for Reducing Capital Gains Tax

  • Hold assets longer than one year to qualify for lower long-term rates.
  • Harvest losses by selling underperforming investments to offset gains.
  • Use tax-advantaged accounts like IRAs or 401(k)s where gains grow tax-deferred or tax-free.
  • Time your sales in years when your income is lower to stay in a lower tax bracket.
  • Keep records of all improvements and selling costs to maximize your cost basis adjustments.
  • Reinvest strategically using approaches like dollar-cost averaging to build positions over time.

Formulas used

Gross Capital Gain
G_{gross} = P_{sale} - P_{purchase}
Net Taxable Gain
G_{net} = \max\!\left(0,\; P_{sale} - (P_{purchase} + C_{improvements}) - C_{selling} - L_{offsets}\right)
Federal Long-Term Capital Gains Tax (Stacked Bracket Method)
T_{fed}^{LT} = \sum_{i} \left[\left(\min(I + D' + G,\, B_i^{max}) - \max(I + D',\, B_i^{min})\right)^{+} \times r_i\right], \quad G = G_{net} - D'
Federal Short-Term Capital Gains Tax
T_{fed}^{ST} = T_{ordinary}(I + G_{net}) - T_{ordinary}(I)
Net Investment Income Tax (NIIT) 4
T_{NIIT} = 3.8\% \times \min\!\left(G_{net},\; \left(AGI - \theta_{NIIT}\right)^{+}\right)
Depreciation Recapture Tax 1
T_{dep} = T_{ord}^{\le 25\%}\!\left(I + D'\right) - T_{ord}^{\le 25\%}(I), \quad D' = \min(D,\; G_{net})
Total Tax Owed
T_{total} = T_{fed} + T_{state} + T_{NIIT} + T_{dep}, \quad T_{state} = G_{net} \times r_{state}
Effective Tax Rate & Net Proceeds
R_{eff} = \frac{T_{total}}{G_{net}} \times 100\%, \quad \text{Net Proceeds} = P_{sale} - C_{selling} - T_{total}

Frequently asked questions

How is capital gain calculated?

Capital gain is your sale price minus your purchase price (cost basis). If you sold an asset for $120,000 and originally paid $50,000, your capital gain is $70,000. The calculator also subtracts improvements, selling costs, and capital losses to find your net taxable gain.

What is the difference between short-term and long-term capital gains tax rates?

Short-term capital gains apply to assets held for one year or less and are taxed at your regular income tax rate.1 For 2026 that rate can be as high as 37%.2 Long-term capital gains apply to assets held for more than one year and are taxed at special lower rates of 0%, 15%, or 20% depending on your income.1

What does cost basis mean?

Cost basis is the total amount you originally paid for an asset. It includes the purchase price plus any capital improvements you made.7 A higher cost basis means a smaller taxable gain when you sell.

What is the Net Investment Income Tax (NIIT)?

The NIIT is an extra 3.8% tax on investment income.4 It applies if your modified adjusted gross income is above $200,000 for single filers, $250,000 for married filing jointly or $125,000 for married filing separately.4 The calculator automatically checks if you owe this tax based on your income and gains.

Do all states tax capital gains?

No. States like Florida, Texas, Nevada, Wyoming, South Dakota, Alaska, and Tennessee have no state income tax, so they charge 0% on capital gains. Other states tax capital gains as regular income, with rates ranging up to 13.3% in California.

What is depreciation recapture?

If you claimed depreciation deductions on an asset like rental property, the IRS requires you to pay back some of that tax benefit when you sell. The depreciation amount is taxed at a maximum 25% federal rate, which is separate from the normal capital gains rate.1

Can capital losses reduce my tax bill?

Yes. Capital losses offset capital gains dollar-for-dollar. If you lost $10,000 on one investment and gained $70,000 on another, you only pay tax on $60,000. Enter your losses in the Advanced Options section of the calculator.

What filing status should I choose?

Choose the status you use on your federal tax return. Single is for unmarried individuals. Married Filing Jointly is for married couples filing one return together. Married Filing Separately is for married couples filing their own returns. Head of Household is for unmarried people who pay more than half the cost of keeping up a home for a qualifying person.8

Why does my income matter for capital gains tax?

Your regular taxable income determines which capital gains tax bracket your profit falls into. Long-term gains are stacked on top of your ordinary income. If your income is low enough, some or all of your long-term gains could be taxed at 0%.

What counts as selling costs?

Selling costs include broker commissions, real estate agent fees, closing costs, transfer taxes, and other expenses directly tied to the sale. These costs reduce your net proceeds and lower your taxable gain.

What tax year should I select?

Select the tax year in which you sold or plan to sell the asset. The calculator uses the correct federal tax brackets and thresholds for each year. If you are planning a future sale, choose the upcoming tax year to estimate your bill.

What is the effective tax rate shown in the results?

The effective tax rate is your total tax divided by your net taxable gain, shown as a percentage. It tells you the overall rate you actually pay on your capital gain after all brackets, state taxes, and additional taxes like NIIT are factored in.

Do I owe capital gains tax if I sold at a loss?

No. If your sale price is lower than your purchase price, you have a capital loss, not a gain. You owe no capital gains tax. You can actually use that loss to offset other gains or deduct up to $3,000 per year against your ordinary income.1

What are improvements and how do they affect my tax?

Improvements are money you spent to add value to an asset, like a kitchen renovation on a house. They increase your cost basis, which lowers your taxable gain.7 Enter improvement costs under Advanced Options in the calculator.

Sources

  1. Topic No. 409, Capital Gains and Losses. Internal Revenue Service. Accessed September 1, 2026.
  2. IRS releases tax inflation adjustments for tax year 2026, including amendments from the One, Big, Beautiful Bill. Internal Revenue Service. 2025;IR-2025-103. Accessed September 11, 2026.
  3. Revenue Procedure 2025-32. Internal Revenue Service. 2025;section 4.03. Accessed September 11, 2026.
  4. Topic no. 559, Net investment income tax. Internal Revenue Service. Accessed September 11, 2026.
  5. Capital gains tax. Washington State Department of Revenue. Accessed September 11, 2026.
  6. Massachusetts tax rates. Massachusetts Department of Revenue. Accessed September 11, 2026.
  7. Topic no. 703, Basis of assets. Internal Revenue Service. Accessed September 11, 2026.
  8. Publication 501, Dependents, Standard Deduction, and Filing Information. Internal Revenue Service. Head of Household. Accessed September 11, 2026.

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