Free Capital Gains Tax Calculator — 2026

Capital gains tax applies when you sell an asset for more than you paid for it. The tax rate depends on two key factors: how long you held the asset and your total taxable income (see the IRS guide on capital gains and losses). Understanding these rules can save you thousands — or even eliminate your tax liability entirely.

Short-Term vs. Long-Term Rates

Assets held for 12 months or less are taxed at ordinary income rates (10–37%). Use our tax bracket calculator to find your ordinary rate. Assets held for more than 12 months qualify for preferential long-term rates: 0%, 15%, or 20%. For most taxpayers, this means long-term gains are taxed at 15% — a significant savings over the 22% or 24% ordinary rate many people face.

The NIIT Surtax

High earners face an additional 3.8% Net Investment Income Tax on investment income above $200,000 (single) or $250,000 (married filing jointly). This brings the maximum long-term capital gains rate to 23.8%. Our calculator automatically applies this when your income exceeds the threshold.

2026 Long-Term Capital Gains Tax Brackets

The 2026 long-term capital gains brackets are based on your taxable income, not just your gains:

• 0% rate: Single filers up to $49,450, married filing jointly up to $98,900. If your total taxable income (including gains) falls below these thresholds, you pay zero capital gains tax.
• 15% rate: Single filers $49,451–$545,500, MFJ $98,901–$613,700. This is the rate most investors pay.
• 20% rate: Single filers above $545,500, MFJ above $613,700.
• 23.8% effective maximum: The 20% rate plus the 3.8% NIIT surtax for high earners.

Tax-Loss Harvesting: A Worked Example

Tax-loss harvesting is one of the most effective strategies for reducing capital gains taxes. Here's how it works in practice:

Say you sold Stock A for a $15,000 gain and Stock B has an unrealized $10,000 loss. By selling Stock B before year-end:

• Net capital gain: $15,000 − $10,000 = $5,000 taxable
• At 15% rate: Tax drops from $2,250 to $750 — a $1,500 savings
• You can immediately reinvest the proceeds into a similar (but not "substantially identical") investment to maintain your portfolio allocation

Important: The IRS "wash sale rule" prevents you from claiming a loss if you buy back the same or substantially identical security within 30 days before or after the sale. However, you can buy a similar index fund or ETF that tracks a different index.

If your net losses exceed your gains, you can deduct up to $3,000 against ordinary income ($1,500 if married filing separately), with any remaining losses carried forward to future years indefinitely.

Real Estate Capital Gains

Real estate has unique capital gains rules that can significantly reduce or eliminate taxes:

• Primary residence exclusion: Up to $250,000 ($500,000 for couples) of home sale gains are tax-free if you lived in the home for at least 2 of the last 5 years. On a home purchased for $300,000 and sold for $700,000, a married couple pays $0 in capital gains tax.
• 1031 exchange: For investment properties, you can defer all capital gains taxes by reinvesting the proceeds into a like-kind property within 180 days. This lets real estate investors build wealth without triggering taxes at each sale.
• Cost basis additions: Your cost basis includes the purchase price plus closing costs, real estate commissions, and capital improvements (new roof, kitchen renovation, additions) — all of which reduce your taxable gain. Use our rent vs buy calculator to evaluate your home purchase decision.
• Depreciation recapture: If you claimed depreciation on a rental property, that amount is recaptured at a 25% rate when you sell — separate from the long-term gains rate.

Cryptocurrency and Digital Asset Taxes

As of 2026, the IRS treats cryptocurrency as property, meaning every sale, swap, or spending event is a taxable capital gains event. Key rules:

• Selling crypto for USD triggers a capital gain or loss
• Swapping one crypto for another (e.g., Bitcoin → Ethereum) is a taxable event
• The same short-term vs. long-term holding period rules apply (12 months)
• Mining and staking rewards are taxed as ordinary income when received, then as capital gains when sold
• Tax-loss harvesting works with crypto, and unlike stocks, crypto is currently not subject to the wash sale rule

Step-Up in Basis for Inherited Assets

When you inherit an asset, your cost basis "steps up" to the fair market value at the date of the decedent's death. This is one of the most powerful tax provisions in the code. For example, if your parent bought stock for $10,000 that was worth $100,000 when they passed away, your cost basis is $100,000 — and you could sell it immediately for $0 in capital gains tax. This eliminates decades of accumulated gains.

Worked Example: $50,000 Stock Gain — Short-Term vs. Long-Term

A single filer earning $85,000 in salary sells stock for a $50,000 gain. The tax impact depends entirely on holding period:

Savings from holding 1 extra month: ~$3,800. If the stock gain pushed total income above $200,000, the 3.8% NIIT would add another $1,900 in tax. Timing your sales around the 12-month mark is one of the simplest and most effective tax strategies available.

Strategies to Minimize Capital Gains Tax

• Hold for over 12 months to qualify for the lower long-term rate (0%/15%/20% vs. up to 37%).
• Harvest losses throughout the year to offset realized gains — don't wait until December.
• Use tax-advantaged accounts: Investments in 401(k)s, IRAs, and HSAs grow tax-free. No capital gains tax applies inside these accounts.
• Time your income: If you're near a bracket boundary, consider spreading large sales across two tax years. Use our tax bracket calculator to model different scenarios.
• Gift appreciated assets: Gifting stock to a family member in a lower tax bracket can result in a lower capital gains rate on the eventual sale. The $19,000 annual gift exclusion (2026) applies.
• Donate to charity: Donating appreciated assets directly to a qualified charity avoids capital gains tax entirely and provides a deduction at fair market value.

Related Tools

• Tax Bracket Calculator — Determine your ordinary income tax rate for short-term gains.
• Investment Calculator — Project future investment growth and plan when to realize gains.
• ROI Calculator — Calculate your true return on investment after accounting for capital gains tax.
• Retirement Calculator — See how capital gains taxes affect your long-term retirement portfolio.
• Take-Home Pay Calculator — Understand your income level to determine which capital gains bracket you fall in.