Capital Gains Tax Calculator 2026

About

Instantly calculate capital gains tax on stock sales. Know exactly what you owe before you sell.

FREE TIER:
• Federal capital gains tax (short-term vs long-term)
• NIIT (3.8% Medicare surtax) calculation
• Holding period detection (< 1 year vs ≥ 1 year)
• Income-based long-term rates (0%, 15%, 20%)
• Complete breakdown: federal tax, NIIT, effective rate, net proceeds

PRO UPGRADE ($4.99 one-time):
• All 50 state capital gains tax rates
• Tax-loss harvesting calculator
• Cost basis methods (FIFO, LIFO, Specific ID, Average Cost)
• Advanced scenario testing

HOW IT WORKS:
1. Enter purchase price and sale price
2. Select holding period (short or long-term)
3. Enter other taxable income and filing status
4. Get instant tax calculation

LONG-TERM GAINS (held ≥ 1 year):
• 0% rate up to $48,350 (single) / $96,700 (married)
• 15% rate up to $533,400 (single) / $600,050 (married)
• 20% rate above those thresholds

SHORT-TERM GAINS (held < 1 year):
Taxed as ordinary income at standard federal rates (10% - 37%)

NIIT (Net Investment Income Tax):
Additional 3.8% Medicare surtax when MAGI exceeds $200K (single) or $250K (married)