2026 Bonus Withholding
Bonus Tax Calculator
Compare the IRS supplemental percentage method (22%, or 37% above $1M cumulative supplemental wages) with a pay-period aggregate estimate that combines your bonus with regular wages for one paycheck.
Comparing two job offers? Try our Salary Comparison Calculator
Employer covering your tax? Use our Gross-Up Calculator →
Estimating qualified overtime instead? Use the No Tax on Overtime deduction calculator →
Estimating qualified tips instead? Use the No Tax on Tips deduction calculator →
Bonus tax calculator questions
How much of a $10,000 bonus do you keep in California?
On a $10,000 bonus in California, estimated take-home after taxes is about $6,012 under the flat-rate supplemental percentage method (22% federal under $1 million in cumulative supplemental wages; 37% above that threshold). This calculator also shows an aggregate estimate that combines the bonus with regular wages for one pay period (IRS Pub 15 percentage method). Figures assume standard 2026 withholding and single filing status.
What percentage of a bonus is taxed in California?
The estimated effective bonus tax rate on a $10,000 bonus in California is approximately 39.9% under the flat-rate supplemental percentage method shown in the example. Federal withholding is generally 22% (37% on cumulative supplemental wages over $1 million). California state withholding is estimated at $1,023. The aggregate card may show a different effective rate because it withholds on the combined pay-period paycheck using ordinary withholding tables.
How is a bonus taxed differently from regular pay in California?
Bonuses are supplemental wages. Employers may withhold federal income tax using the flat-rate supplemental method (22%, or 37% above $1 million in cumulative supplemental wages) or the aggregate method. This calculator shows both: the flat-rate percentage method and an aggregate estimate that adds the bonus to regular wages for the pay period, calculates withholding on the combined amount, and backs out regular-only withholding (IRS Pub 15). Your employer may use either IRS-allowed approach; withholding is only an upfront estimate — your final tax depends on total annual income when you file.
Does California have a separate bonus tax rate?
California publishes a separate supplemental / bonus withholding rate. Estimated California withholding on a $10,000 bonus is $1,023 using that flat supplemental rate in the percentage-method example.
Bonus tax calculator by state
Pre-filled calculators for all 51 jurisdictions — compare percentage vs aggregate withholding methods.
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