Which states have flat income tax rates?

Colorado (4.4%), Illinois (4.95%), Michigan (4.25%), North Carolina (4.99%), Pennsylvania (3.07%), Utah (4.65%).

Which states have no income tax?

Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.

How is flat state tax calculated?

State Tax = Gross Wages × State Tax Rate. Most flat-rate states apply it to all taxable income with minimal deductions.

State Income Tax (Flat Rate) Calculator

Estimate state income tax withholding for flat-rate states based on gross wages and applicable state rate.

Principal ($)

Annual Rate (%)

Years

Compounding / Year

$ Finance Disclaimer: These calculators are for educational and illustrative purposes only. Results do not constitute financial advice. Consult a licensed financial advisor before making investment or borrowing decisions.

How It Works

Estimate state income tax withholding for flat-rate states based on gross wages and applicable state rate

Each component has a specific meaning:

Gross wages — The gross wages recorded for the scenario being assessed.
Applicable state rate — The applicable state rate recorded for the scenario being assessed.

Note: Interpret the state income tax result against the thresholds and context described above.

How to Use

Enter the gross wages, applicable state rate for the scenario you are assessing. Estimate state income tax withholding for flat-rate states based on gross wages and applicable state rate. Use the state income tax result to inform your calculation.

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State Income Tax (Flat Rate) Calculator

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Frequently Asked Questions

Which states have flat income tax rates?

Which states have no income tax?

How is flat state tax calculated?