California Income Tax Calculator
Figures reflect 2026 tax-year limits (IRS Notice 2025-67 & SSA 2026).
California has the highest top state income tax rate in the country, and the math is uglier than most people realize. The state runs nine brackets from 1% to 12.3%, then layers a 1% Mental Health Services Tax on every dollar of taxable income above $1 million, which pushes the true top rate to 13.3%. That is before federal tax, before the 3.8% NIIT, and before payroll taxes. A California income tax calculator built for 2026 should show you all of it at once so you can plan around it.
This tool runs your federal return and your California Franchise Tax Board (FTB) return side by side. Plug in wages, self-employment income, capital gains, and pre-tax retirement contributions and you will see federal, state, and the SDI deduction in one view. California taxes long-term capital gains as ordinary income, so a stock sale that is taxed at 15% federal can still face the full 9.3% or 13.3% on the state side. Equity-comp recipients in San Francisco and our actor and entertainer clients in Los Angeles run this calculation constantly.
Our New York City CPA firm works with a lot of Los Angeles and Bay Area clients, and the questions are almost always the same: how much of the bonus disappears, whether the move to Texas is worth it, and what the FTB will do to a vesting RSU tranche. The calculator below answers the easy part. For the planning part, see our tax strategy guides or send us a new client inquiry.
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What CA does differently
California treats long-term capital gains as ordinary income for state purposes. A federal LTCG taxed at 20 percent becomes 13.3 percent state on top of that for a top-bracket Californian — a combined 33.3 percent before the federal NIIT 3.8 percent. Selling a $5M company in Los Angeles costs about $1.5 million more in state tax than selling the same company in Texas or Florida.
California also does not conform to the federal QBI deduction (Section 199A). And the 1 percent Mental Health Services surtax above $1M of taxable income is in addition to the 12.3 percent top bracket, producing the 13.3 percent effective top rate. CA Franchise Tax Board publishes annual brackets.
Why people leave (and why some come back)
The 13.3 percent top rate plus 37 percent federal plus 3.8 percent NIIT puts a top California earner at roughly 54 percent marginal on the next dollar of ordinary income — before any local taxes or AMT. Florida and Texas have no state income tax. For founders mid-career, the difference compounds fast.
That said: leaving California is not as simple as flying somewhere else. The state’s residency rules are aggressive, and audits of “I moved” claims have intensified. We work with clients who have actually moved (intent to remain plus a real life there) versus those who keep significant ties. The FTB residency guide is the starting point.
If you sold equity, RSUs, or ISOs while a CA resident, CA claims tax on the gain even if you move before the proceeds hit. Sourcing rules for stock comp depend on when it was granted, when it vested, and where you worked over the vesting period — not just where you lived on the sale date.
Coordinating CA + NY + federal
For clients with bi-coastal lives — actors, executives, founders — we coordinate the federal, CA, and NY filings, including the credits for taxes paid to other states. Most years one state is the resident state and the others are nonresident. Getting the apportionment right takes the most time on the return.
How does a California income tax calculator factor in the 1% mental health services tax on income above $1 million?
Does a California income tax calculator use the right top FTB bracket of 13.3%?
Why does a California income tax calculator show such different results from a Texas or Florida one?
How do I use a California income tax calculator to plan a move from San Francisco to Austin?
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Frequently Asked Questions
Can a California income tax calculator account for the SDI (State Disability Insurance) wage cap?
This is a question that has changed in the last two years and a lot of california income tax calculator tools online are still showing the old answer. So pay attention to the year stamp on whatever tool you are using.
Historically, California State Disability Insurance (SDI) had a wage cap. As recently as 2023, SDI was withheld on wages only up to about $153,000 per year per employee, at a rate of around 0.9%. So the maximum SDI deduction per year was roughly $1,378. After your YTD wages crossed the cap, your paychecks stopped showing SDI withholding for the rest of the calendar year. Old california income tax calculator tools still have this cap hardcoded.
That changed in 2024. Senate Bill 951, signed in 2022, eliminated the SDI wage cap effective January 1, 2024. SDI now applies to all wages with no upper limit. So a wage earner making $5M of W-2 income now has SDI withheld on every dollar of those wages, not just the first $150K or so. The rate is set annually by EDD; for 2024 it landed at 1.1%, and recent years have hovered around 1.1% to 1.2%. Your california income tax calculator should reflect this if it claims to be current.
So what does this mean in dollars? On $500,000 of W-2 wages at a 1.2% SDI rate with no cap, the SDI deduction is $6,000 per year. On $5,000,000 of wages, it is $60,000 — up from the old $1,378 maximum. That is a roughly 43-fold increase for top earners. A california income tax calculator built before 2024 will dramatically understate the bite on high incomes.
Here is the part that catches people off guard: SDI is a state-mandated payroll tax, but it is technically not part of your FTB income tax. It shows up on your pay stub as a separate line item, similar to FICA at the federal level. On your federal return, SDI used to be deductible as a state and local tax (subject to the SALT cap). The SALT cap means most high earners get no real deduction value out of it. So the 1.2% feels like 1.2%, not the after-tax-deduction version of 1.2%.
Self-employed individuals are not subject to SDI by default. The program is funded by employee wage withholding. If you are 1099 or run an S-corp where you take W-2 wages from your own company, the W-2 portion is subject to SDI like any other employee. Pure self-employed people on Schedule C are not. A california income tax calculator should ask whether you are a W-2 employee or self-employed, and then handle SDI accordingly. Our services for S-corp owners frequently include planning around the reasonable-wage discussion partly because of the SDI exposure on the wage piece.
This S-corp angle creates an interesting planning move that is worth running through the calculator. If you operate an S-corp in California and pay yourself $250K in W-2 wages plus $250K in K-1 distributions, the SDI bite is roughly $3,000 (1.2% of $250K). If, instead, you push the W-2 portion down to $150K (still meeting the reasonable-comp test for a midsize service business) and take $350K in K-1, the SDI piece drops to $1,800 — a $1,200 annual saving. That is on top of the FICA savings the reasonable-comp structure already produces. Multiply by 20 years and you have $24K just from the SDI piece. Not the biggest line in the planning conversation, but a real number.
One curveball: SDI also covers the California Paid Family Leave program. So even though you may never have collected disability benefits, you have effectively been pre-paying for paid family leave benefits if you ever need them. The benefits are calculated as a percentage of your past wages, but capped at a weekly maximum. So a CEO contributing $60K a year in SDI does not get a benefit that scales with their contribution. The benefit cap is the same as for a $50K worker. The surprising line: California’s SDI elimination of the wage cap is, functionally, a six-figure annual tax on top earners with effectively zero corresponding benefit increase — it just funds the system on the back of the same people who paid for the smaller previous version.
Worth knowing: SDI benefits, when paid, are not subject to federal income tax (they are not “wages” in the IRS sense) and are not subject to California income tax either. So in the rare year when you actually collect from the system, the benefits are received tax-free. That is the only reason the program does not feel like pure cost to top earners — it is a coverage product they almost never use, and when they do, the benefit cap is low enough that it does not meaningfully replace lost income. The california income tax calculator conversation focuses on the cost side because that is the part that shows up every paycheck.
For a california income tax calculator to show SDI honestly, it needs three things visible: the rate for the current year (set by EDD, not a fixed number), the wages base (now all wages, no cap, post-2024), and the employee-only nature (employers do not match SDI like they do FICA). Get any one of those wrong and the take-home line will be off. A surprising number of online calculators still treat SDI as capped at $153K or quote a 0.9% rate from 2023. If the tool you are using does not say what year it was last updated, treat the SDI line skeptically.
So when you run a california income tax calculator, confirm it shows SDI on a separate line, confirm the year, and confirm the cap is set to “none” or “unlimited” if you are using 2024 numbers or later. If the tool still has a $153,000 cap in place, you are getting last year’s answer. The dollar miss on a $500K-plus earner is significant enough to skew the whole take-home picture by $5,000 to $6,000 per year. For the official rate and benefit schedule each year, see the FTB and EDD websites — the FTB does not administer SDI, but it interacts with the deduction question on Schedule CA. Cross-checking the calculator against EDD’s posted current-year rate is a 30-second sanity check that catches the worst errors.