Estimate state income tax using each state’s top or flat rate.
Real state taxes use brackets, deductions and credits; this uses one rate for a quick comparison.
Please do not make financial decisions based on these results.
What is the State Tax Calculator?
Estimate state income tax using each state’s top or flat rate. To use the State Tax Calculator, enter taxable income, state; it returns estimated state income tax, after-state-tax income, rate used, and shows them instantly as you type.
How income is taxed
Federal income tax is progressive, so higher slices of income are taxed at higher rates. Your filing status, deductions and pre-tax contributions determine your taxable income. Start with the income tax calculator and then see the effect on your paycheck with the take-home paycheck calculator.
Pay and filing questions
To compare hourly, weekly and yearly pay, use the salary calculator. If you are married, the marriage tax calculator compares filing together with filing as two single people.
How to use the State Tax Calculator
- Enter your numbers. The inputs are Taxable income ($). Use the tax year and filing status that apply to you, and gross figures unless a field says otherwise. Fields marked optional can stay at zero.
- Choose your options. State change how the result is worked out, and the form updates to match your choice.
- Read the result. The highlighted box gives the Estimated state income tax, and the cards below show After-state-tax income, Rate used. Tables and charts break it down further.
- Test other scenarios. Results update as you type. Change one value at a time to see what drives the answer, and press Reset to go back to the defaults.
Formula and how it works
Example with real numbers
Here is the State Tax Calculator using the default values shown in the calculator above:
Inputs
| Taxable income ($) | 80,000 |
|---|---|
| State | Alabama / Massachusetts (5%) |
Results
| Estimated state income tax | $4,000.00 |
|---|---|
| After-state-tax income | $76,000.00 |
| Rate used | 5% |
With these inputs the calculator returns Estimated state income tax: $4,000.00. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Taxable income ($) from 80,000 to 96,000 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| Estimated state income tax | $4,000.00 | $4,800.00 | +20% |
| After-state-tax income | $76,000.00 | $91,200.00 | +20% |
| Rate used | 5% | 5% | 0% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
What the results tell you
The results panel of the State Tax Calculator reports Estimated state income tax, after-state-tax income and rate used. Compare these figures while changing one input at a time, and use the related calculators below to look at the same situation from another angle.
Method and limits. This calculator applies the formula in the section above to your inputs, in your browser; nothing you enter is stored on our servers. Tax rules change every year and depend on your full situation (state, filing status, credits), so treat the result as an estimate and confirm it with the IRS or a tax professional. It is for information, not financial, tax or legal advice.
Frequently asked questions
Do all states tax income?
No. Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington and Wyoming do not tax wages.
Which tax year and rates are used?
US federal brackets and standard deductions for 2026 and 2025, plus FICA. State tax is a rate you enter.
Is this tax advice?
No. Please do not make tax decisions based on these results. Use a tax professional for your actual return.
Are the results guaranteed?
No. Results depend entirely on the numbers you enter and the formulas shown on this page. Please do not make financial decisions based on them alone; confirm important figures with a licensed professional.
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