What This Calculator Estimates
US state income tax varies enormously by state — some states (like Texas and Florida) levy no state income tax at all, others use a flat rate, and many use progressive brackets similar to the federal system but with entirely different thresholds and rates. Because there is no single 'state income tax' — each state sets its own rules — this calculator uses an editable rate so you can model the specific rate that applies to your state and income level.
How to Use This Calculator
- Enter taxable income.
- Enter an estimated state tax rate.
- Click Estimate State Tax.
- Review the estimated tax and after-tax income.
- Verify official state rules before relying on the result.
Formula / Method Used
Unlike federal tax, state income tax rules vary enormously: some states (Texas, Florida, Washington, Nevada, and others) charge no state income tax at all, some use a single flat rate, and others use progressive brackets similar to the federal system. There is no single formula that applies nationwide — this calculator uses the rate or bracket structure for the state you select.
Worked Example
A flat-tax state at 4.95% on $60,000 taxable income owes $2,970. A progressive-bracket state might apply 2% on the first $10,000, 4% on the next $30,000, and 6% on the remaining $20,000 — totaling $2,600. The same income can produce meaningfully different results depending on the state, so always confirm your specific state's current brackets.
Official Sources
Check your state department of revenue directly — the Federation of Tax Administrators state tax agency directory links to every state's official tax authority.
Related Calculators
Federal Income Tax Calculator · Sales Tax Calculator · Taxable Income Calculator
Tips for a More Accurate Estimate
- Confirm whether your state levies income tax at all before assuming a rate applies.
- Check whether your state uses a flat rate or progressive brackets.
- Consider reciprocity agreements if you work in a different state than you live in.
- Recheck your state's current rate tables each tax year, since rules can change.
- Pair this with the Federal Income Tax Calculator for your total combined tax estimate.
Frequently Asked Questions
Do all US states have income tax?
No, several states (such as Texas, Florida, Nevada, and others) levy no state income tax at all, while the rest use either a flat rate or a progressive bracket system.
Is state income tax calculated the same way as federal tax?
Not necessarily — some states use flat rates, others use progressive brackets with their own thresholds, and rules on deductions and credits vary significantly by state.
Can I owe state tax in a state I don't live in?
Sometimes, particularly if you earn income in a different state than your residence — many states have reciprocity agreements or specific nonresident tax rules, so check your specific situation.
Does this calculator know my state's specific rules automatically?
No, since state rules vary enormously, you need to enter the rate applicable to your specific state and income level manually.
Where can I confirm my state's current tax rules?
Your state's department of revenue or taxation website publishes current rate tables, brackets, and filing requirements.
Last updated: May 11, 2026