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California Bonus Tax Calculator

Estimate take-home pay on a bonus, using the federal flat-rate supplemental withholding method

Estimate only — not tax advice. Federal tax on the bonus uses the flat 22% supplemental withholding rate (37% on cumulative supplemental wages over $1,000,000/year) — the alternative "aggregate method" some employers use instead is not modeled. FICA and any state SDI/PFL are computed as the difference between your regular income with and without the bonus added, so the Social Security wage cap applies correctly. State tax on the bonus is a marginal-bracket estimate, not necessarily any special state supplemental rate. See methodology below for source and last-verified date.

How California Paycheck Tax Is Calculated (2026)

Source: California Franchise Tax Board
Taxable income bracketRate
$0 – $10,7561%
$10,756 – $25,4992%
$25,499 – $40,2454%
$40,245 – $55,8666%
$55,866 – $70,6128%
$70,612 – $360,6599.30%
$360,659 – $432,78710.30%
$432,787 – $721,31411.30%
$721,314 – $1,000,00012.30%
$1,000,000 – +13.30%

Standard deduction (single): $5,706, subtracted from gross income before applying brackets.

state_tax = marginal_bracket_tax(gross_income - 5706, brackets)

California SDI: 1.3% of wages, no wage cap. Mandatory State Disability Insurance payroll deduction, 1.3% of all wages with no cap in 2026. Funds short-term disability and Paid Family Leave — separate from income tax.

Federal Tax & FICA (shared across all states)

Filing statusStandard deduction
Single$16,100
Married Filing Jointly$32,200
Head of Household$24,150
Federal brackets (all filing statuses)10% / 12% / 22% / 24% / 32% / 35% / 37%
Social Security6.2% up to $184,500 wage base
Medicare1.45% on all wages, +0.9% above $200,000 single/HoH, $250,000 MFJ

⚠️ California's married-filing-jointly and head-of-household state brackets have not yet been independently verified against the primary source above — this calculator uses California's single-filer brackets as an estimate when those statuses are selected.

Guideline version 2026-CA-v1 · Last verified 2026-07-26

California Paycheck Calculator FAQ

What are California's income tax brackets for 2026?

California uses 9 marginal brackets from 1% (income up to $10,756) to 12.3% (over $721,314 for single filers), plus a 1% Mental Health Services Tax on taxable income over $1,000,000, for a 13.3% top effective rate.

What is California SDI and is it a tax?

State Disability Insurance (SDI) is a mandatory payroll deduction, not a state income tax — 1.3% of all wages in 2026 with no wage cap. It funds short-term disability and Paid Family Leave benefits and is withheld separately from income tax.

How much is take-home pay on $65,000 in California?

On a $65,000 gross salary, a single filer in California takes home roughly $50,942/year (about $4,245/month) after federal tax, FICA, state income tax, and SDI.

Methodology & Source

California state tax figures sourced from California Franchise Tax Board (https://www.ftb.ca.gov/), citing Cal. Rev. & Tax. Code § 17041 — 9-bracket schedule (1%-12.3%) plus 1% Mental Health Services Tax on taxable income over $1,000,000 (top effective rate 13.3%). Federal brackets, standard deductions (single/MFJ/HoH), and FICA constants sourced from the IRS (Revenue Procedure 2025-32; married-filing-jointly Additional Medicare threshold of $250,000 is a separate, unindexed statutory figure). California's married-filing-jointly and head-of-household figures are not yet independently verified and currently fall back to single-filer brackets — see the caveat in the formula section above.

Bonus federal withholding uses the flat supplemental-wage rate (22%, 37% above $1,000,000 cumulative supplemental wages/year), per IRS Publication 15 (Circular E), Employer's Tax Guide, 2026 edition — the alternative "aggregate method" is not modeled.

This is an estimate based on standard single-filer federal, FICA, CA state tax, and CA SDI calculations. Actual withholding may differ based on your W-4/DE 4 elections, pre-tax deductions (401k, health insurance), and other factors. CA's exact 2026 bracket thresholds are inflation-indexed and finalized by the FTB in late 2026 — this page uses the most recently projected figures and will be updated once finalized.

Pre-tax deductions assumption: HSA and health insurance premium contributions are assumed to also reduce the California SDI wage base, consistent with their FICA wage treatment. This is a reasonable default, not independently verified against California's specific California SDI statute.

Guideline version: 2026-CA-v1 · Effective: 2026-01-01 · Last verified: 2026-07-26