What is the difference between short-term and long-term capital gains in the US?

Assets held for one year or less before selling generate short-term capital gains, taxed at ordinary federal income tax rates (up to 37%). Assets held for more than one year qualify for preferential long-term capital gains rates (0%, 15%, or 20%).

What are the 2026 long-term capital gains tax brackets for single filers?

For single taxpayers in 2026: 0% rate applies to taxable income up to $48,350; 15% rate applies from $48,351 to $533,400; 20% rate applies to income exceeding $533,400.

When does the 3.8% Net Investment Income Tax (NIIT) apply?

The 3.8% NIIT applies to net investment income (including capital gains, dividends, and rental income) for taxpayers whose Modified Adjusted Gross Income (MAGI) exceeds $200,000 for single filers or $250,000 for married couples filing jointly.

US Capital Gains Tax Rates 2026: Brackets & NIIT

Navigating US Capital Gains Tax in 2026

When you sell stock shares, index mutual funds, cryptocurrency, or real estate for a profit, the IRS classifies your return as a capital gain. Understanding the holding period threshold and income brackets is essential to avoid surrendering up to 40% of your profits to federal and state taxation.

1. 2026 Long-Term Capital Gains Tax Brackets

For assets held longer than 365 days, preferential federal rates apply:

| Long-Term CGT Rate | Single Filers | Married Filing Jointly | Head of Household | |---|---|---|---| | 0% | Up to $48,350 | Up to $96,700 | Up to $64,750 | | 15% | $48,351 to $533,400 | $96,701 to $600,050 | $64,751 to $566,700 | | 20% | Over $533,400 | Over $600,050 | Over $566,700 |

(Short-term capital gains for assets held 1 year or less are treated as ordinary income and taxed at standard rates from 10% to 37%).

2. Verified Numerical Scenario: $35,000 Stock Gain Realized

Consider a single investor with $115,000 in ordinary taxable salary income, who sells shares in an S&P 500 index fund purchased three years prior, realizing a $35,000 net capital gain:

| Tax Element | Amount ($) | Calculation Details | |---|---|---| | Ordinary Taxable Salary | $115,000.00 | Base salary income | | Net Long-Term Capital Gain | $35,000.00 | Assets held 3 years | | Combined Income Baseline | $150,000.00 | Pushes gains into 15% bracket | | Applicable Capital Gains Rate | 15.0% | Between $48,351 and $533,400 threshold | | Federal Long-Term Capital Gains Tax | $5,250.00 | $35,000 × 15% | | Net Investment Income Tax (3.8% NIIT) | $0.00 | MAGI ($150,000) is below $200,000 threshold | | Total Federal Tax on $35,000 Gain | $5,250.00 | Effective federal tax rate: 15.0% |

Comparison vs Short-Term Gain:

Had this investor sold these shares after 11 months instead of 3 years:

The $35,000 gain would sit in the 24% ordinary income bracket.
Federal tax would equal $8,400.00.
Holding for just one extra month saved this investor $3,150.00 in cash!

3. The 3.8% Net Investment Income Tax (NIIT) Surcharge

High earners face an additional layer of taxation under Internal Revenue Code Section 1411:

If your Modified Adjusted Gross Income exceeds $200,000 (Single) or $250,000 (Married Jointly), net investment income is subjected to an extra 3.8% NIIT.
For a high earner in the 20% bracket, the combined top federal capital gains rate becomes 23.8%.

4. Regulatory Sources & Verification

Statutory Authority: Internal Revenue Code Section 1(h) (Capital Gains) & Section 1411 (Net Investment Income Tax). Verified on 21/09/2026.
Cost-Basis Reporting: Form 1099-B & Form 8949 reporting rules. Verified on 21/09/2026.

5. Scope & Limitations

State income taxes apply on top of federal capital gains (e.g., California taxes capital gains as regular income up to 13.3%).
Wash-sale rules disallow tax deductions if you buy substantially identical securities within 30 days before or after realizing a loss.

Calculate your investment taxes and portfolio growth:

US Capital Gains Tax 2026: Brackets, 3.8% NIIT & Long-Term vs Short-Term

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