Enter your state’s flat rate or effective rate — states range from 0% (TX, FL, WA…) to ~13% (CA top bracket).
Example: Taxable income: $80,000 · State tax rate (flat or effective): 5% → State income tax: $4,000.
After state tax: $76,000
Frequently asked questions
How do I calculate state income tax? Enter your state’s flat rate or effective rate — states range from 0% (TX, FL, WA…) to ~13% (CA top bracket). Enter your numbers above and the result updates instantly. For example: Taxable income: $80,000 · State tax rate (flat or effective): 5% → State income tax: $4,000.
Is this State Income Tax Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for state income tax. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.