Bonus Tax Calculator for California
California withholds 10.23% on supplemental wages — the highest published state supplemental rate, so bonus checks in CA feel the pinch most. This calculator applies the federal 22% supplemental rate, 7.65% FICA and the California rate to any bonus amount so you can see the net before payroll does.
Quick answer: In California, a $10,000 bonus nets roughly $5,900–$6,050: $2,200 federal withholding, $765 FICA, and about $10.23 state supplemental withholding.
$
CA bonus supplemental rate 10.23%
Estimated take-home
$6,012.00
of $10,000.00 gross (60% kept)
| Gross bonus | $10,000.00 |
| Federal supplemental withholding (22%)prepayment — your real tax is set at filing | − $2,200.00 |
| FICA (6.2% SS + 1.45% Medicare) | − $765.00 |
| State supplemental (California 10.2%) | − $1,023.00 |
| Net bonus | $6,012.00 |
Withholding-level estimate. The 22% federal rate is a prepayment, not your final tax — excess withholding is refunded when you file. FICA of 7.65% assumes you are under the Social Security wage base for the year. Not tax advice.
Core facts
| State | California (CA) |
|---|---|
| State rate used | ≈ 10.2% supplemental (estimate) |
| Federal | 22% supplemental withholding |
| FICA | 7.65% |
Common uses
- Preview a year-end bonus in California
- Compare a bonus against the equivalent salary increase
- Check a bonus paycheck that looked small
Frequently asked questions
Frequently Asked Questions
Why is my bonus check smaller in California than my coworker's in another state?
Because California withholds roughly 10.2% on supplemental wages on top of the federal 22% and 7.65% FICA. The state slice is the difference-maker for bonus checks.
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More guides
How Are Bonuses Taxed?
The 22% supplemental rule, the aggregate method, FICA, state tax — and why over-withheld bonus tax comes back as a refund.
Is Overtime Taxed More?
Overtime is withheld at a higher flat rate but taxed as ordinary income — and from 2026 the premium gets a federal deduction.
No Tax on Overtime, Explained
The 2026 OBBBA overtime deduction in plain English: what qualifies, the caps, the phase-out, and the fine print.
What Is Time and a Half?
The FLSA overtime rule, who's exempt, how the rate is computed, and state rules that go beyond 1.5×.