State Bonus Tax Calculator
How much state income tax comes out of a bonus, and what is left once your state has taken its share.
About State Bonus Tax Calculator
State Bonus Tax Calculator — estimates the state income tax taken out of a bonus and what remains. A bonus is wages, so the state that taxes your salary taxes your bonus. This applies the state income-tax rate to the bonus amount and shows what remains. In a flat-rate state the figure is exact for the state part; in a graduated state a bonus can push income into a higher bracket, which a single rate cannot show, so those states ask for your own rate. Only the state component is calculated here: federal supplemental withholding and FICA come off as well, and employers often withhold federal tax on a bonus at a flat supplemental rate rather than at your bracket, which is why a bonus cheque looks smaller than expected and why some of that withholding comes back at filing time.
Formulas
Bonus state tax
Bonus state tax = bonus amount × state rate
Bonus net
Bonus net = bonus amount - bonus state tax
Worked example
With the default values below, State Bonus Tax Calculator returns State Tax on Bonus of $495.00. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Stateone of Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming
- Illinois
- Your state tax rateaccepts 0–60
- Bonusminimum 0
- 10,000
Results
- State Tax on Bonus
- $495.00
- Amount After State Tax
- $9,505.00
- State
- Illinois
- State rate used
- 4.95% (verified)
- Tax year
- 2026
- Source
- https://tax.illinois.gov/research/taxrates/income.html
Step by step
- 1Values used
- 2Bonus state tax
- 3Bonus net
- 4State Tax on Bonus= 495.00
- 5Amount After State Tax= 9,505.00
- 6State= Illinois
- 7State rate used= 4.95% (verified)
- 8Tax year= 2026
- 9Source= https://tax.illinois.gov/research/taxrates/income.html
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- State component only and an estimate. Federal income tax, FICA and any local tax are not included.
- This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
State component only and an estimate. Federal income tax, FICA and any local tax are not included.
Frequently Asked Questions
Is a bonus taxed at a higher rate than salary?
Not taxed at a higher rate, but often withheld at a different one. A bonus is ordinary income on your return. Employers may withhold federal tax on it at the flat supplemental rate instead of using your W-4, so the withholding can exceed the tax actually owed and the difference is refunded when you file.
Does the state take a separate supplemental rate for bonuses?
Some states publish a supplemental withholding rate distinct from their income-tax rate. In a flat-tax state the two coincide, which is the case for every state verified here. If your state publishes a separate supplemental rate for bonuses, enter it in the rate field.
How does the IRS flat 22% supplemental withholding affect my bonus?
Federal law requires employers to withhold 22% on supplemental wages up to $1 million, and 37% above that. This is a withholding rule, not a tax rate - the bonus is still taxed at your marginal rate when you file, and any over-withholding is refunded. The state tax estimated here is separate from federal withholding.
Can I adjust my W-4 to reduce bonus withholding?
You can submit a new W-4 to increase allowances or specify an extra withholding amount, which affects regular paychecks but may not change the supplemental rate applied to a separate bonus payment. Many employers are required to use the flat supplemental rate regardless of the W-4 for standalone bonus checks.
Why does it say the rate is not verified for my state?
For bonus tax, the old per-state page carried a flat rate that either could not be matched to a current revenue department publication, or the state uses a graduated schedule that a single rate cannot represent. Rather than show a number with no provenance, the calculator asks you for the rate from your own notice or return and then uses exactly that.
How do I use my own rate for bonus tax?
Type your bonus tax rate into the state rate field. Anything you enter wins over the built-in rate, and the result panel then labels the rate as yours rather than verified. Clearing the field goes back to the verified rate. A rate of 0 counts as blank, so to model a state with no income tax select one that has a verified 0%.
Which tax year does the bonus state rate belong to?
The result panel prints the tax year for the bonus rate. Each verified rate is stored with the tax year it was published for and a link to the page it was read from, so you can check it before relying on the figure. Unverified states show neither, because there is nothing to show.