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

Short-term gains apply to assets held one year or less and are taxed at ordinary income rates. Long-term gains apply to assets held more than one year and usually qualify for lower federal rates of 0%, 15%, or 20% for most investments.

How do I estimate capital gains tax on a single sale?

Enter purchase price, sale price, holding period, and approximate annual income into a capital gains calculator. It computes your gain and applies simplified federal brackets. State taxes, NIIT, and other income are not included in basic estimates.

Do I owe tax if I only hold investments?

Holding an investment is generally not taxable. Tax typically applies when you sell, exchange, or otherwise dispose of the asset. Some assets also generate taxable income (dividends, interest) while you hold them.

Capital Gains Tax Guide: Short-Term vs Long-Term Rates

Q: What is capital gains tax?

Capital gains tax is federal tax on profit when you sell an asset for more than your cost basis. The gain is generally sale proceeds minus what you paid (plus adjustments). In the US, rates depend on how long you held the asset and your taxable income.

What Is Capital Gains Tax?

When you sell stocks, crypto, real estate, or other property for more than you paid, the profit is a capital gain. The IRS generally taxes that gain when you realize it—at sale—not while you hold the asset. Your cost basis is usually what you paid plus certain fees; proceeds are what you receive when you sell.

Capital Gain = Sale Proceeds − Cost Basis (simplified)

This guide covers federal rules for individual investors. State taxes, the 3.8% Net Investment Income Tax (NIIT), and complex situations like wash sales or multiple tax lots need professional review.

Short-Term vs Long-Term Capital Gains

Holding period is the main fork in US federal treatment:

Short-term (≤ 1 year): Taxed as ordinary income at your marginal bracket (10%–37% for 2024 federal rates, depending on income).
Long-term (> 1 year): Qualifies for preferential rates—typically 0%, 15%, or 20% for most securities (collectibles and some real estate have special rules).

Selling one day before versus one day after the one-year mark can change which rate schedule applies. Track purchase dates carefully, especially for volatile assets like crypto.

How to Calculate Your Gain

Record your purchase price and any buying fees.
Record your sale price and selling fees.
Subtract cost basis from proceeds to get the capital gain (or loss).
Determine whether the holding period is short-term or long-term.
Apply the appropriate federal rate based on income and holding period.

Use our free capital gains tax calculator to run a single-sale federal estimate with 2024 bracket assumptions. For many crypto transactions, see our crypto tax calculator for FIFO/LIFO lot matching.

2024 Federal Rate Overview

Long-term capital gains rates for 2024 depend on taxable income thresholds (single filer examples from IRS guidance):

Rate	Typical income range (single)
0%	Up to ~$47,025 taxable income
15%	~$47,026 – $518,900
20%	Above ~$518,900

Thresholds change annually and vary by filing status. Verify current IRS Publication 550 or speak with a CPA before filing.

What Basic Estimates Miss

State and local capital gains taxes
3.8% Net Investment Income Tax (NIIT) for higher earners
Capital loss offsets and $3,000 ordinary income offset rules
Wash sale adjustments for securities
Alternative Minimum Tax (AMT)
Multiple tax lots and partial sales

Next Steps

Use a calculator for planning, then confirm with a qualified tax professional before selling large positions or filing. Keep brokerage 1099-B statements, purchase confirmations, and wallet export history for audit-ready records.