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US capital gains calculator
Short vs long-term gains at your bracket.
About this calculator
What it estimates
US federal tax on a capital gain, distinguishing short-term (ordinary rates) from long-term (0% / 15% / 20%) treatment.
Assumptions (US 2025 tax year rates)
- •Long-term 0% band up to $48,350 (single) / $96,700 (MFJ) of taxable income; 15% up to $533,400 / $600,050; 20% above
- •Net Investment Income Tax of 3.8% is flagged but not added
- •No state tax
Estimates only, for orientation. Rates and thresholds change each tax year and your actual liability depends on facts this tool does not ask for. This is not tax advice.
For US–UK filers
Why your real number differs
Gains on UK assets — including your UK home above the $250,000 / $500,000 exclusion — are US-taxable for citizens and Green Card holders, and currency movements on a sterling mortgage can create a separate US gain. UK CGT paid may be creditable against the US liability.