Your client filed a clean federal return. Section 199A deduction claimed, bonus depreciation taken, maybe even a tidy QSBS exclusion on that startup sale. Then they ask what they owe California.
The answer is almost always more than they expect, because California state tax runs on a different rulebook than federal. The state updated its conformity date in October 2025, but that update stopped six months short of the biggest federal tax overhaul in years. Everything in the One Big Beautiful Bill Act (OBBBA) sits outside California's window by design.
This guide covers the verified 2025 California state tax brackets, the full rate picture above $1 million, and the adjustments that create the gap between what your clients think they owe and what the Franchise Tax Board will say.
California income tax brackets are adjusted annually to the California Consumer Price Index, so the 2025 California state income tax brackets below differ from the 2024 California tax brackets. The figures come directly from the 2025 FTB Tax Rate Schedules, not third-party summaries. Several widely-cited reference sites still show last year's thresholds, so confirm you are using the current figures before filing.
The top California income tax rate is 13.3%, not 12.3%. The extra 1% is the Behavioral Health Services Tax (BHST), which applies to all California taxable income above $1 million for every filing status. Originally enacted as the Mental Health Services Tax under Proposition 63 (2004), it was renamed under Proposition 1 (2024), though the Form 540 mechanics are unchanged.
Two things catch planners off guard here. First, the $1 million threshold is not indexed for inflation, so a one-time RSU vest or business sale can push a client over it without warning. Second, the MFJ threshold is not doubled for married filers, unlike most California income tax brackets.
The 2025 California standard deduction is $5,706 for single filers and married/RDP filing separately, and $11,412 for married/RDP filing jointly, head of household, and qualifying surviving spouse.
These figures reflect 2025 CCPI indexing and replace the 2024 California standard deduction amounts of $5,540 and $11,080. For a fuller comparison of how the California standard deduction stacks up against itemizing for your clients, Bizora's breakdown covers the 2025 and 2026 thresholds side by side.
The personal exemption credit is $153 for single, MFS, and HOH filers, and $306 for MFJ and qualifying surviving spouse. It phases out above $252,203 of AGI for single filers and $504,411 for MFJ filers per the 2025 Form 540 Phase-Out Worksheet. The dependent exemption credit is $475 per dependent.
California SDI (State Disability Insurance) runs at 1.2% on all wages in 2025 with no wage ceiling. The California EDD has confirmed the rate rises to 1.3% starting January 1, 2026, adding another year-over-year cost for wage earners and payroll planners.
Add the 12.3% top bracket, the 1% BHST, and the 1.2% SDI together and the true incremental cost on top-bracket California wage income reaches 14.5%. That is the actual California state income tax rate for a W-2 employee at the high end.
California also maintains its own Alternative Minimum Tax at a flat 7% rate under R&TC §17062, computed on FTB Schedule P (540). Federal OBBBA made no changes to California's AMT exposure.
California does not automatically adopt federal tax law. The state uses a fixed-date conformity system, where only federal changes enacted before a specific cutoff date apply to California returns. Every change after that date requires separate California legislation before it affects in-state tax.
For ten years before October 2025, California's conformity date was frozen at January 1, 2015. SB 711 moved it forward by a decade, and CalCPA supported the bill because that gap had produced more than 1,000 federal tax law changes without corresponding California action. That divergence created compounding reconciliation work for practitioners running two increasingly different sets of rules on the same return.
The date chosen was not accidental. OBBBA was signed July 4, 2025, six months after California's new conformity start point.
As Grant Thornton noted in its October 2025 alert, California's updated conformity date "means that the legislation does not address the OBBBA... California appears poised to completely decouple from the tax measures in the OBBBA until a future legislative vehicle." No conformity legislation covering OBBBA provisions is currently pending as of this writing.
What SB 711 did adopt matters too. The Alternative Simplified Credit for California's R&D tax credit now applies at modified state rates of 3% and 1.3%, replacing the prior Alternative Incremental Credit. Real-property-only Section 1031 treatment applies for exchanges beginning January 1, 2025.
The provisions practitioners most needed (bonus depreciation, Section 199A, and QSBS) remain outside California law.
This is the reference table for the 2025 filing season. Every provision below applies regardless of how aggressively clients planned on the federal side.
For a client-specific conformity question that requires primary FTB citations, Bizora's AI tax research assistant handles California conformity queries with direct statutory sourcing rather than synthesized summaries.
Federal law now excludes up to $15 million of QSBS gain from income for stock issued after July 4, 2025. California does not recognize any part of the Section 1202 exclusion, as Frost Brown Todd Gibbons documented in their QSBS state survey: California "explicitly provides that it does not recognize any QSBS exclusion under Section 1202, even in partial conformity." Every dollar excluded on the federal return flows back onto the California return as gain taxed at ordinary rates up to 13.3%.
For a founder selling $10 million of federally excluded QSBS, the California-only tax bill runs roughly $1.33 million. Residency planning is the primary lever, but it must begin 12 to 24 months before the exit.
The FTB's EDR2 data-matching program reconstructs residency using DMV records, employer filings, IRS data, property records, airline manifests, and banking activity, so a move to Nevada in the months before closing will not hold up to scrutiny.
California is one of two states that does not conform to the federal HSA treatment, and the Schedule CA mechanics generate recurring errors across returns. Employee HSA contributions are not deductible on Form 540, so any federal Schedule 1 Line 13 deduction must be reversed on Schedule CA Part I, Line 23b (Column C). Employer contributions in Box 12 Code W must be added back to California wages on Schedule CA Line 1f (Column C).
HSA interest, dividends, and capital gains are also taxable to California in the year earned, even though no 1099 is issued. Those amounts must be reconstructed from year-end account statements and entered as California income. Tax software handles these three adjustments inconsistently, so confirm the Schedule CA output manually before filing.
SB 167 (signed June 27, 2024) suspended California NOL deductions for tax years 2024 through 2026 for any taxpayer with net business income or modified AGI of $1 million or more. Business tax credit utilization is also capped at $5 million per taxpayer per year during the same period, with carve-outs for the PTET credit and low-income housing credits.
Suspended losses are not lost. The carryforward period extends by one, two, or three years depending on the year of suspension. SB 175 included a conditional early-sunset provision allowing the Director of Finance to lift the suspension if revenue projections support it, but as of this writing that trigger has not been pulled.
SB 711 brought California into real-property-only Section 1031 conformity for exchanges beginning on or after January 1, 2025. For exchanges where the replacement property sits outside California, however, the deferred California-source gain does not simply track federal treatment. FTB Form 3840 must be filed every year reporting the deferred gain and tracking the replacement property, continuing until that gain is finally recognized.
Many practitioners file Form 3840 once and stop. The filing obligation runs even after a taxpayer leaves California, as long as the original deferred gain had California source. For multi-state real estate investors, this is a recurring compliance item that keeps the FTB statute of limitations open on the deferred amount.
California's pass-through entity tax was extended through tax year 2030 in the 2025-26 budget trailer signed June 27, 2025. The election is available to partnerships and S-corporations and produces a dollar-for-dollar credit against the owners' California individual income tax.
For most of its history, the PTET was close to an automatic election because the federal SALT cap sat at $10,000. OBBBA changed that math. The new $40,000 federal cap applies fully below $500,000 of AGI, then phases down at 30% of the excess toward a $10,000 floor.
Pass-through owners with AGI well above $500,000 still benefit more from the PTET, but owners below that threshold may find the new cap narrows the advantage significantly. California business owners dealing with the Section 199A deduction gap will also find the QBI planning implications differ significantly on the state side, since California offers no equivalent deduction.
The June 15 prepayment requirement is client-critical for 2025 returns. Under the rules in place for tax year 2025, a missed or underpaid prepayment voided the PTET election entirely. Starting with 2026 returns, a missed prepayment reduces the credit by 12.5% of the shortfall rather than invalidating the election, but that change is prospective.
Any 2025 situation where the prepayment was missed needs a specific review of whether the election was preserved. For a detailed look at how the SALT phase-down interacts with California PTET planning, Bizora's SALT torpedo analysis covers the federal-state interaction in detail.
Most California non-conformity items flow through Schedule CA (540). These are the eight entries that produce the most errors and FTB correspondence:
A California-resident software engineer receives $1.4 million in RSU income in 2025 and has $200,000 in pass-through income from a side business. Assuming the business is not a specified service trade or business and has sufficient W-2 wages to support the calculation, the federal Section 199A deduction could reach roughly $40,000 (20% of QBI). The engineer also contributed $4,150 to an HSA during the year.
On the federal return, the Section 199A deduction reduces taxable income (it is a below-the-line deduction, not an AGI adjustment), and the HSA contribution reduces AGI as an above-the-line deduction. On the California return, neither benefit applies.
California does not conform to Section 199A, so California taxable income is computed without that deduction. The HSA contribution is also not deductible for California purposes, and any employer HSA contributions in Box 12 Code W on the W-2 require a California wage adjustment.
That means California taxable income is higher than federal taxable income by roughly $44,150, the combined amount of the Section 199A deduction and the HSA contribution. At a $1.4 million income level, the marginal California income tax bracket on those additional dollars is likely 10.3% to 12.3% depending on filing status and total deductions, so the incremental California tax on the gap is $4,500 to $5,400. This figure is illustrative; the actual number depends on the taxpayer's full California taxable income picture.
Add SDI at 1.2% on all wages for 2025 (California removed the SDI wage cap effective January 1, 2024), plus the 1% Mental Health Services Tax on taxable income above $1 million. The 13.3% headline California state tax rate understates what this taxpayer actually pays once conformity gaps, SDI, and the millionaire's surtax are all counted.
California's 2025 return now requires two genuinely different analyses: one federal, one state. For clients with significant pass-through income, startup equity, depreciation-heavy assets, or HSA contributions, the gap between federal adjusted gross income and California taxable income is real and often larger than clients expect.
CalCPA's Gina DeRosa, CPA, CFP, captured the practitioner burden precisely: since 2015, more than 1,000 federal tax law changes have been made without corresponding California action. SB 711 closed part of that gap. OBBBA opened it back up for 2025 and beyond.
The other variable to watch is the SB 175 NOL suspension trigger. If the California Director of Finance certifies adequate revenue projections, the suspension on NOL deductions and the $5 million business credit cap could lift before the scheduled 2026 sunset.
Verify the current FTB guidance before advising clients on any 2026 year-end positions that rely on those deductions. If you want a research tool that handles California R&TC citations, PTET mechanics, and Section 1202 questions with direct statutory sourcing, try Bizora free for 7 days.
Yes. California imposes a state income tax on all income earned or sourced in the state, with residents taxed on worldwide income and non-residents taxed only on California-source income. California income tax rates for 2025 range from 1.00% to 13.3%, making it one of the highest state income tax rates in the country.
The California state tax rate ranges from 1.00% to 12.30% across nine brackets, depending on filing status and taxable income. An additional 1% Behavioral Health Services Tax applies to income above $1 million, bringing the top California state income tax rate to 13.3%. California SDI of 1.2% applies separately on wage income with no wage cap.
The 2025 California income tax brackets start at 1% on income up to $11,079 for single filers and climb through nine rates to 12.3% on income above $742,953. Married filers use Schedule Y with roughly doubled bracket thresholds. The 1% BHST applies on all income above $1 million for every filing status, producing the effective 13.3% top rate.
Yes, significantly. California taxes income at up to 13.3%, while the top federal rate is 37%. More importantly, California income tax rates apply to some income that is federally excluded, including QSBS gains under Section 1202, because California does not conform to that exclusion. Capital gains are also taxed at ordinary income rates in California, unlike the federal preferential rates.
California income tax rates range from 1% to 13.3% depending on how much you earn and your filing status. For a single filer with $200,000 of taxable income in 2025, the total California income tax comes to approximately $15,965 using Schedule X, before the $153 personal exemption credit. SDI at 1.2% applies additionally to any wages within that income.
The 2025 California standard deduction is $5,706 for single filers and $11,412 for married filing jointly or head of household. These are the current 2025-indexed figures. Multiple reference sites still show the 2024 California standard deduction amounts of $5,540 and $11,080.
No. California has never conformed to Section 168(k) bonus depreciation and does not conform to OBBBA's permanent 100% bonus depreciation. Separate California depreciation calculations are required for every asset where federal bonus depreciation was claimed. This remains one of the most common sources of Schedule CA errors on returns with significant business fixed assets.
Yes, in full. California explicitly does not conform to Section 1202 and does not recognize any QSBS exclusion. Every dollar of gain excluded on the federal return is fully taxable in California at ordinary income tax rates up to 13.3%. For a $10 million federal QSBS exclusion, the California-only tax bill can exceed $1.3 million.