How California Stacks Up to 13.3% on Top of Federal
California runs nine progressive brackets from 1% to 12.3%, and a 1% Mental Health Services Tax on taxable income above $1 million pushes the true top rate to 13.3%, the highest state income tax in the country. Just as important for most workers: California's standard deduction is only $5,706 for a single filer and $11,412 for a married couple (2025), roughly a third of the federal $16,100/$32,200. That gap means your California taxable income is meaningfully higher than your federal taxable income. A single filer earning $120,000 has about $114,294 of California taxable income and owes roughly $7,068 in state income tax, an effective state rate near 5.9%, well below the 9.3% marginal bracket that income lands in.
CASDI: The Uncapped 1.3% Line Most Calculators Skip
California State Disability Insurance is withheld at 1.3% of wages for 2026, and since SB 951 took effect in 2024 there is no wage ceiling. On a $120,000 salary that is a flat $1,560; on $300,000 it is $3,900. Before 2024 this deduction stopped at a wage cap, so high earners now pay noticeably more than they used to. It shows up as "CASDI" on your pay stub, funds both disability and Paid Family Leave benefits, and is separate from your income tax withholding.
No City Income Tax, So the State Rate Is the Whole Story
Unlike New York or Pennsylvania, no California city or county levies its own income tax. Your state withholding plus CASDI is the entire sub-federal bite on your wages, which makes California payroll math simpler than its high-tax reputation suggests. The flip side is that the headline state rate is doing all the work, so there is no local add-on to plan around, just the progressive state schedule and the flat 1.3% CASDI.
How California Taxes Retirement Income
California is gentler on retirees than its top rate suggests, but only on one front. Social Security benefits are fully exempt from California income tax (the Franchise Tax Board excludes them, along with Tier 1 railroad retirement), so someone living on Social Security owes the state nothing on those benefits. Everything else is taxed as ordinary income on the same 1% to 13.3% schedule: private and public pensions, plus withdrawals from 401(k)s and traditional IRAs. There is no general senior exclusion of the kind Georgia or Illinois offer, so a California retiree drawing a $60,000 pension alongside Social Security pays state tax on the pension but not the benefits. One extra trap: California adds a 2.5% state tax on early retirement-account withdrawals, on top of the federal 10% penalty.
California's Cash-Back Credits: CalEITC and the Young Child Tax Credit
Lower- and moderate-income California workers can claim two refundable credits that pay out even when no tax is owed. The California Earned Income Tax Credit (CalEITC) is worth up to $3,756 for the 2025 tax year for workers with earned income under roughly $32,000, and it stacks on top of the federal EITC. Households that qualify for CalEITC and have a child under age 6 can add the Young Child Tax Credit, worth up to $1,189. Both are administered by the Franchise Tax Board and claimed on the Form 540 return rather than through payroll, so they arrive as a refund instead of smaller withholding. If your income qualifies, these credits can swing your annual cash flow by thousands, which is worth modeling before you set your withholding.
Beyond the Paycheck: Prop 13 and California Sales Tax
Income tax is only one line of a California household's burden. Property tax is governed by Proposition 13: the base rate is 1% of assessed value, and assessed value can rise no more than 2% a year until the property changes hands and is reassessed to market. The practical result is an effective property tax rate near 0.7% of current market value (Tax Foundation), low by national standards, though high home prices keep the dollar bills large and long-time owners pay far less than the neighbor who just bought in. Sales tax starts at a 7.25% statewide minimum, the highest base rate in the country, and local add-ons push it past 10% in some cities (California Department of Tax and Fee Administration). For a high earner the income tax dominates; for a modest earner in a long-held home, Prop 13 can pull the total burden below what the 13.3% headline implies.
Adjusting Your Withholding: the DE-4 and Form 540
California stopped following the federal W-4 in 2020, so your state withholding is set separately on Form DE-4, the Employee's Withholding Allowance Certificate. File only a federal W-4 and your employer defaults California to single with zero allowances, which over-withholds for many people. The DE-4 (from the EDD) lets you set California allowances, add a flat extra dollar amount per check, or claim exemption. At filing time, residents reconcile on Form 540 (part-year and nonresident filers use Form 540NR), due April 15. If you changed jobs, married, or had a child mid-year, filing a fresh DE-4 is the quickest way to stop a large refund or balance due from building up.
Where Pre-Tax Dollars Work Hardest in California
Because California layers a 9.3% (or higher) marginal rate on most professional salaries on top of the federal 22-24%, a dollar moved into a traditional 401(k) can save 31-37 cents in combined federal-plus-state tax. CASDI still applies because it is assessed on gross wages, but income tax savings stack federal and state together. For earners approaching the $1 million line, the 13.3% top marginal rate makes deferral and timing especially valuable. Adjust the 401(k) field in the calculator above to see the combined effect on your California take-home pay.
What California Actually Costs Versus a No-Tax State
Put numbers on the trade-off. Our $120,000 single filer pays roughly $7,068 in California income tax plus $1,560 in CASDI, about $8,628 a year that a worker in Texas, Florida, or Washington would keep entirely. That is the price of the move, before considering California's higher housing and sales taxes. Whether it is worth it depends on the salary premium California employers tend to pay and what you value in return. Run your own figure in the calculator above, then compare states side by side with our State Tax and Housing Comparison tool to see the full picture, not just the income tax line.
Social Security and Medicare (FICA) are federal, so they come out the same in California as in every other state. The main Paycheck Calculator walks through the full federal side, including the Social Security wage base and the Additional Medicare surtax.