Estimated Tax on Capital Gains Calculator
Turn a stock, property or other capital gain into a current-year federal tax estimate and a remaining safe-harbor payment plan.
What this estimate covers
- Applies preferential long-term capital-gain brackets and NIIT through the existing tax engine.
- Compares current- and prior-year safe-harbor paths.
- Shows the incremental tax caused by the gains separately from total projected tax.
Frequently asked questions
Do I need an estimated payment after a capital gain?
Possibly. A payment may be needed when withholding and credits will not cover the smaller of 90% of current-year tax or the applicable prior-year safe harbor.
What is the 110% safe harbor?
The prior-year target is generally 110% instead of 100% when prior-year AGI exceeded $150,000, or $75,000 for married filing separately.
What if the gain occurred late in the year?
Form 2210 Schedule AI may allow the annualized-income installment method so the payment pattern follows when income was actually earned.
Is there a minimum before estimated payments are required?
Yes. Estimated payments are generally not required if you expect to owe less than $1,000 after subtracting withholding and refundable credits.
Are there conditions on using the prior-year safe harbor?
Yes. The prior-year safe harbor is available only if the prior-year return covered a full 12 months and was actually filed.
Sources
Related Calculators
Capital Gains Tax Calculator
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Estimated Tax Penalty
Form 2210 safe harbor, 90%/100% prior-year test, 7% rate
Installment Sale Tax Calculator
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