Income Tax Calculator
Estimate federal income tax with progressive brackets, the standard or itemized deduction, plus a flat state estimate and your effective and marginal rates.
How to use the Income Tax Calculator
- Fill in each field with your own figures — the defaults are only there as an example.
- The result updates as you type, so there is no button to press.
- Check the breakdown under the main result for the supporting numbers.
- Use the copy button to take the result with you, or share the link to reload the same inputs.
Income Tax Calculator — frequently asked questions
What is the difference between marginal and effective tax rate?
Your marginal rate is the rate charged on your last dollar of income. Your effective rate is total tax divided by total income, and it is always lower because the earlier brackets are taxed less.
Is this an official tax filing tool?
No. It is an estimate for planning that uses federal brackets and a flat state assumption. Credits, phase-outs, self-employment tax and local levies can change the result, so confirm with a tax professional or IRS guidance before filing.
Is this income tax calculator free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
How accurate is the result?
The maths is exact for the formula shown on the page. Accuracy in the real world depends on your inputs and on assumptions the formula cannot see, so treat the output as a well-grounded estimate rather than a quote.
Can I use it on my phone?
Yes. The page is responsive, weighs a few kilobytes and works offline once loaded, so it behaves the same on a phone as on a desktop.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 13, 2026 · Calculation runs client-side · No data collected · Report an error