US Capital Gains Tax Calculator 2026
Estimate federal tax on stock and investment gains — short-term vs long-term rates and NIIT.
Last updated: 2026-06-01
Capital Gains Tax
$
10.00 Thousand
$
15.00 Thousand
Four Hundred
$
75.00 Thousand
Capital gain
$5,000
Long-term capital gains
Federal tax
$750
NIIT (3.8%)
$0
Total estimated tax
$750
15% effective on gain
Data sources
Rates and thresholds on this page are based on official publications. Verify against the source for your specific circumstances.
- IRS Publication 550 — Investment Income and Expenses — verified 2026-06-01 · Capital gains and investment income rules
- Internal Revenue Service (IRS) — verified 2026-06-01 · Federal income tax brackets and withholding
Federal estimates only. State taxes, wash sales, and loss harvesting not fully modeled. Not tax advice.
Related guides
- Capital Gains Tax on Stocks in 2026
US short-term vs long-term capital gains rates, holding periods, and how to estimate tax on stock sales.