California Paycheck Calculator (Tax Year 2025)
California stacks four withholding layers on top of FICA: a federal income tax (IRS Pub 15-T brackets and standard deduction), a California state income tax (FTB nine-bracket schedule from 1% to 12.3% — among the steepest in the U.S.), Social Security and Medicare at federal rates, and the California SDI at 1.2% of every dollar of gross. The calculator runs the layered withholding math from the actual 2025 rule-packs and shows where each dollar goes.
This is an estimate, not tax or payroll advice. Figures are based on the rule-packs cited below; consult a licensed professional before relying on them for filings, withholding, or compliance.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Net pay (annual) | Net pay per paycheck | Federal income tax | FICA (SS + Medicare) | State withholding | Take-home % of gross |
|---|---|---|---|---|---|---|
| Single, $100k, 26 paychecks | $72,328.02 | $2,781.85 | $13,614.00 | $7,650.00 | $6,407.98 | 72.33% |
| Married joint, $200k, 26 paychecks | $146,137.84 | $5,620.69 | $27,228.00 | $13,818.20 | $12,815.96 | 73.07% |
| Single, $250k with $10k pre-tax (SS cap + Additional Medicare) | $164,715.82 | $6,863.16 | $49,063.00 | $14,993.20 | $21,227.98 | 65.89% |
| Head of household, $150k, 26 paychecks | $107,771.39 | $4,145.05 | $21,708.00 | $11,475.00 | $9,045.61 | 71.85% |
How This Calculator Works
Enter gross annual pay, filing status, paycheck frequency, and pre-tax deductions. The engine applies six layers in order: federal income tax (Pub 15-T standard deduction + progressive brackets), Social Security (6.2% capped at $176,100), Medicare (1.45% on all gross), Additional Medicare (0.9% surtax above $200k single / $250k joint), California income tax (FTB standard deduction + nine progressive brackets to 12.3%), and California SDI (1.2% flat on gross — no wage cap since SB 951). Pre-tax 401(k) and HSA reduce federal + state income-tax bases but not the FICA or SDI bases.
The Formula
Stacked Jurisdiction Withholding
Each rule-pack layer applies one primitive (allowance / progressive / flat / flat_capped / surtax / credit) to a defined base. Pre-tax deductions reduce income-tax base; FICA bases stay on gross.
Worked Example
A single Californian earning $100,000 with 26 bi-weekly paychecks and no pre-tax deductions (2025 rules): federal income tax $13,614 (taxable $85k through the brackets); FICA $7,650 (6.2% + 1.45% on $100k); California income tax $5,208 on $94,294 taxable through the FTB schedule, plus $1,200 SDI (1.2% × $100k) = $6,408 California withholding total. Net = $72,328/year, or $2,782 per paycheck — about 72.3% take-home. A married Californian filing jointly at $200,000 over 26 paychecks: federal $27,228, FICA $13,818 (SS capped at $176,100 so $10,918, Medicare $2,900), CA $12,816 (income tax + SDI); net $146,138, or $5,621 per check (73.1% take-home — joint brackets give back some of the gap).
Key Insight
The California layer compounds quickly. At $100,000 single, your effective state hit (income tax + SDI) is ~6.4% of gross — versus 0% in Texas — wiping out about $6,400/year. The 9.3% bracket starts at $72,724 single in 2025 (a $2,118 jump from 2024 thanks to the 3.0% CCPI inflation adjustment), so most middle-class W-2 earners still hit it but a hair later than last year. Pre-tax retirement contributions are unusually valuable here because they avoid both federal AND California income tax — every $1,000 into a traditional 401(k) saves roughly $35-$48 in California tax on top of federal. HSAs (uniquely) avoid all three of federal income tax, California income tax, AND FICA. None of this is advice — California withholding is intricate (the FTB Method B tables differ slightly from the bracket schedule for low incomes) and material decisions belong with a licensed professional.
The six layers stacked on a California paycheck
Each California paycheck has six withholding layers, in this order. Federal income tax (IRS Pub 15-T, computed on gross minus the federal standard deduction, then through the progressive brackets) — this is the biggest single layer for most earners. Social Security (6.2% on every dollar up to the $176,100 cap for 2025). Medicare (1.45% on every dollar, no cap). Additional Medicare (0.9% on every dollar above $200,000 single / $250,000 married joint — this is a surtax, not a bracket). California income tax (FTB nine-bracket schedule applied to gross minus the CA standard deduction, $5,706 single / $11,412 joint or HoH for 2025). California SDI (1.2% flat on every dollar of gross — no wage cap since SB 951).
Pre-tax deductions modify base differently per layer. Traditional 401(k) and HSA contributions reduce the federal and California income-tax bases (the largest two layers) but they do NOT reduce the Social Security, Medicare, Additional Medicare, or California SDI bases — those stay on full gross. This is why the marginal tax saving from a pre-tax dollar is your federal-marginal + California-marginal rates only, not the full effective rate.
The SB 951 SDI shift and what it costs high earners
Before January 1, 2024, California SDI applied a wage cap (~$153,164 in 2023, indexed annually). Under Senate Bill 951 (signed September 2022), the cap was eliminated effective 2024, and the rate is now set annually by EDD with no upper limit on the wage base subject to SDI. The 2025 rate, per EDD, is 1.2% of every dollar of gross wages.
The practical effect at high incomes: a $500,000 California earner now pays 1.2% × $500,000 = $6,000 in SDI in 2025, versus what would have been ~$1,700 under the pre-2024 capped regime. That's a $4,300 increase per year purely from SB 951, on top of California's already-steep top-bracket income tax. For very high earners (above $1M taxable income), the 1% Mental Health Services Tax surtax adds another layer not modeled here.
For most workers earning under $176,100 (the Social Security cap), SB 951 doesn't change anything material — they were already paying SDI on every dollar. The change only matters above the old cap.
Withholding methods vs filing — what this calculator is and is not
This calculator estimates the withholding that ordinarily flows out of a W-2 paycheck under the rule-packs cited above. It does NOT compute your tax return — at filing, you reconcile actual tax owed (which may include itemized deductions, credits, dependents, capital gains, and California-specific items like the renter's credit) against what was withheld, producing a refund or balance due. For middle-income W-2-only earners with a vanilla W-4 and DE 4, the withholding estimate here is usually within a few hundred dollars of actual tax owed.
The calculator also assumes the bracket-schedule method of computing California withholding. The CA EDD DE 44 publishes a 'Method B' formula that is mathematically equivalent at most incomes but rounds in specific ways at very low or very high wages — material decisions should not rely on the calculator's third-decimal estimate. The published DE 44 worksheet is the authority for actual employer withholding compliance.
Frequently Asked Questions
Is California's 12.3% top bracket really the rate I'd pay?
Only on the slice of taxable income above $742,953 (single) / $1,485,906 (married joint) for 2025 — California is progressive, not flat. The 12.3% rate applies only to dollars in that top bracket. The 9.3% bracket (which starts at $72,724 single in 2025) is what most upper-middle-class single earners actually hit at the margin. There is also a separate 1% Mental Health Services Tax surtax on taxable income above $1M, which this calculator does NOT include (it's out of MVP scope; it would be an additional 'surtax' layer).
What is California SDI and why is it 1.2% with no cap?
State Disability Insurance (SDI) is California's mandatory short-term disability and paid family leave program, administered by the EDD. It's an employee-only payroll deduction (no employer match). Senate Bill 951 (signed September 2022, effective January 1, 2024) removed the wage cap on SDI — before SB 951, SDI applied only up to a wage cap (~$153,164 in 2023). Starting 2024 the cap is gone and the rate is set annually by EDD; the 2025 rate per EDD is 1.2% of every dollar of gross wages. This means very high earners now pay materially more into SDI than they did pre-2024.
How does the California paycheck differ from a Texas paycheck on the same gross?
At $100,000 single, 26 paychecks, no pre-tax: California take-home is ~$72,300/year ($2,782/check), Texas take-home is ~$83,800/year ($3,223/check) — a roughly $11,500 annual gap, almost entirely from California state income tax and SDI. The gap narrows as a percentage at higher incomes (because the Social Security wage cap kicks in identically in both states), but the absolute dollar gap grows.
Do pre-tax 401(k) contributions reduce California state tax?
Yes. California conforms to the federal treatment of traditional 401(k) elective deferrals: contributions reduce both the federal income-tax base and the California income-tax base. They do NOT reduce Social Security, Medicare, or California SDI. The calculator's pre-tax-deductions field models this correctly. (Roth 401(k) contributions, by contrast, would not reduce any income-tax base — Roth dollars are post-tax going in; this calculator does not separately model Roth.)
What happens at the Social Security wage cap?
For 2025, you pay 6.2% Social Security on the first $176,100 of gross wages, then 0% above. So crossing the cap creates a 6.2 percentage-point increase in marginal take-home for every dollar earned above $176,100. Medicare's 1.45% and California's 1.2% SDI keep going on every dollar with no cap, and at $200,000 single / $250,000 married joint the 0.9% Additional Medicare surtax kicks in — the 'wage cap bump' is real but smaller than people expect because of these uncapped layers.
Is this calculator tax or payroll advice?
No. This is an estimate based on published 2025 federal and California rules. It does not account for the 1% Mental Health Services Tax surtax on income over $1M, supplemental wages, multi-state work (a notorious California issue for remote workers), itemized deductions, retirement-saver credits, your specific W-4 / DE 4 elections, or local item like the San Francisco employer head tax. Use it to compare scenarios, not to file. For filing decisions or W-4/DE 4 elections, consult a licensed CPA or enrolled agent.
References & Authoritative Sources
- U.S. Internal Revenue Service — Publication 15-T — Federal Income Tax Withholding Methods (2025) · consulted January 1, 2025 · Standard deduction and federal bracket schedule used by the federal_income_tax layer in us-federal-payroll-2025.
- U.S. Internal Revenue Service — Rev. Proc. 2024-40 — 2025 Inflation Adjustments for Tax Brackets · consulted October 22, 2024 · Source of the 2025 federal bracket boundaries and standard deductions.
- Social Security Administration — Contribution and Benefit Base — 2025 ($176,100) · consulted October 10, 2024 · Source of the 2025 Social Security wage base cap used by the social_security flat_capped layer.
- California Employment Development Department — DE 44 — California Employer's Guide (2025), including Method B withholding schedules and SDI rate · consulted January 1, 2025 · Source of California 2025 withholding schedules and the 2025 SDI rate (1.2% of all gross wages per SB 951).
- California Franchise Tax Board — 2025 California Tax Rate Schedules (personal income tax brackets and standard deduction) · consulted January 1, 2025 · Source of the 2025 California progressive brackets used by the ca_income_tax layer.
Related Calculators
Data Sources & Benchmarks
This calculator draws on 2 independent, dated sources.
Methodology & Review
California net-pay estimator for tax year 2025. Federal layer: IRS Rev. Proc. 2024-40 brackets and Pub 15-T standard deduction (Single $15,000 / MFJ $30,000 / HoH $22,500). FICA: Social Security 6.2% capped at $176,100, Medicare 1.45% uncapped, Additional Medicare 0.9% above $200,000 single / $250,000 married joint. California layer: FTB 2025 progressive brackets (1% to 12.3%, nine brackets per filing status, reflecting the 3.0% CCPI inflation adjustment for 2025) over CA standard deduction (Single/MFS $5,706, MFJ/Surviving Spouse/HoH $11,412). CA SDI: 1.2% flat on all gross wages (no wage cap — SB 951 removed the cap effective 1/1/2024; rate per EDD's 2025 announcement). Pre-tax deductions (traditional 401(k), HSA) reduce federal and state income-tax bases but not FICA or SDI. NOT modeled: 1% Mental Health Services Tax surtax on income over $1M (would be an additional CA surtax layer); local taxes (CA has no city income tax in scope of W-2 withholding); supplemental wages, mid-year proration, multi-state allocation, itemized deductions, retirement-saver credits.
Updated