California Capital Gains Tax in 2026: What Bay Area Investors Need to Know

A Bay Area venture-backed founder who sells company stock and clears $5 million in long-term capital gain is looking at a combined effective rate north of 37 percent on that gain, assuming they have been a California resident for the full holding period. That number surprises people who have heard that long-term gains are taxed at 15 or 20 percent federally. Those federal rates are real. California simply does not care about them. The state taxes capital gains exactly like wages, salary, and consulting income. There is no preferential rate, no holding-period discount, no exclusion for qualified small business stock at the state level. What you earn from selling appreciated assets gets stacked on top of your other California income and taxed at your marginal ordinary income rate.

This guide covers the full capital gains picture for California residents in 2026: how the federal and state layers interact, what planning tools actually reduce the bill (and which ones California has quietly disallowed), the residency planning play that works and the one that does not, and what the One Big Beautiful Bill Act of 2025 changed. If you have a liquidity event on the horizon, a large real estate position, or a meaningful taxable investment portfolio, the rate math alone is worth understanding before you act.

How California Taxes Capital Gains

California Revenue and Taxation Code §17024.5 does not incorporate the federal capital gains preference rates from IRC §1(h). That single non-conformity is the source of most of the pain. Where federal law draws a line between short-term and long-term gains and applies different rate schedules, California treats the distinction as irrelevant for rate purposes. A stock held for 13 months and sold at a gain gets the same California treatment as a stock held for 13 days.

The California ordinary income rate schedule for 2026 runs from 1 percent on the lowest bracket to 12.3 percent on taxable income over roughly $677,000 for married filers (and over roughly $338,000 for single filers). On top of that 12.3 percent bracket sits the Mental Health Services Act surcharge of 1 percent on individual (not household) taxable income over $1 million, enacted by Proposition 63 in 2004. The result: California's top marginal rate on capital gains, as on all other ordinary income, is 13.3 percent. For a Bay Area tech executive or founder with substantial capital gains, this is the rate to plan around. The California FTB publishes the current rate schedules annually.

California also assesses its capital gains on gains from California-source assets even if you have left the state. If you sold California real estate or exercised California-source stock options while living elsewhere, California will assert its right to tax that income. Moving to Nevada after the fact does not eliminate the tax on California-source gains that have already been recognized.

Federal Capital Gains Rates in 2026

The federal treatment is more nuanced. IRS Topic 409 describes the capital gains rate structure. The key distinction is holding period:

Short-term capital gains (STCG) apply to assets held one year or less. The gain is treated as ordinary income at whatever your marginal federal bracket is. For 2026, federal ordinary income rates run from 10 percent to 37 percent. A Bay Area engineer in the top bracket selling RSUs within 12 months of vesting pays federal tax at 37 percent on the gain, before NIIT and before California.

Long-term capital gains (LTCG) apply to assets held more than one year. The federal rate schedule under §1(h) for 2026 has three brackets:

• 0 percent for taxpayers with taxable income under approximately $94,050 (married filing jointly) or $47,025 (single). Most Bay Area investors do not land here.
• 15 percent for the broad middle range. MFJ filers with taxable income between $94,050 and $583,750 pay 15 percent on long-term gains.
• 20 percent for MFJ filers with taxable income above $583,750 (above roughly $518,900 for single filers). This is the rate for most Bay Area investors with significant liquidity events.

Certain classes of gain have different rates. Qualified dividend income follows the same rate schedule as LTCG. Unrecaptured §1250 gain from real estate depreciation is taxed at a maximum 25 percent federal rate. Collectibles gain is capped at 28 percent. Gain on §1202 QSBS is excluded entirely at the federal level (more on that below).

The Net Investment Income Tax: Layer Three

On top of the federal rate sits the Net Investment Income Tax (NIIT) under IRC §1411. This is a 3.8 percent surtax on the lesser of (a) net investment income or (b) the amount by which modified adjusted gross income exceeds the threshold: $200,000 for single filers, $250,000 for married filing jointly.

Net investment income includes capital gains, interest, dividends, passive activity income, and royalties. Wages, active business income, and Social Security do not count. For a high-income Bay Area investor, capital gains sit squarely in the NIIT base. The 3.8 percent hits on top of the 20 percent LTCG rate, for a combined federal rate of 23.8 percent on long-term capital gains. Add California's 13.3 percent and the combined rate reaches 37.1 percent. On a $5 million gain, that is $1.855 million in tax. Getting the planning right on a transaction that size matters.

California has no equivalent of the NIIT. There is no California-level surtax on net investment income beyond the ordinary income tax and the Mental Health Services Act surcharge described above.

California vs. Federal: Comparison Table

§1202 QSBS: The Major Bay Area Gotcha

Section 1202 of the IRC is the most valuable tax provision available to startup founders in the United States, and California's refusal to conform to it is one of the most significant and least-understood state tax surprises in the Bay Area. Get this wrong and you will walk away from a nine-figure acquisition believing you owe nothing on $10 million in gain, then receive a California FTB notice telling you that you owe approximately $1.33 million.

Here is how it works at the federal level: §1202 allows a non-corporate taxpayer to exclude from federal gross income up to 100 percent of gain from the sale of Qualified Small Business Stock (QSBS), subject to a per-issuer limit of the greater of $10 million or 10 times the taxpayer's adjusted basis in the stock. To qualify, the stock must be: original-issue C corporation stock, held for more than five years, acquired when the corporation had aggregate gross assets under $50 million, and the corporation must be engaged in a qualified trade or business (software, technology, and most non-professional-services businesses qualify). The OBBBA 2025 extended several QSBS provisions and raised the per-issuer exclusion cap to $15 million for stock issued after July 4, 2025 in qualified startup industries.

California has not conformed to §1202, and it has not conformed to the OBBBA 2025 QSBS changes either. California Revenue and Taxation Code §18152.5 addresses QSBS and provides a much narrower exclusion than the federal version, limited to stock in California-based corporations acquired in certain years under more restrictive rules. For most founders selling federally-qualifying QSBS in 2026, the California treatment is: the excluded federal gain gets added back, and the full gain is taxed as California ordinary income at up to 13.3 percent.

On a $10 million QSBS gain that is 100 percent excluded federally, a California resident owes zero federal tax and approximately $1.33 million to California. On a $15 million QSBS gain under the OBBBA-expanded cap, the California bill approaches $2 million on gain that is federally untaxed. This is not a planning failure; it is a known and intentional California policy choice. The planning is around it, not around it disappearing. See our full writeup on QSBS tax planning for the federal eligibility mechanics and the California mitigation strategies available before and after the exit.

§1031 Like-Kind Exchanges

Section 1031 allows real property investors to defer capital gains tax by exchanging one investment property for a like-kind replacement property. Pre-2018, §1031 applied to both real and personal property. The Tax Cuts and Jobs Act limited it to real property only. That limitation remains in place under OBBBA 2025.

California generally conforms to §1031. A California resident investor who sells a Los Angeles apartment building and reinvests the proceeds into a Texas industrial facility can defer both federal and California capital gains, provided the exchange meets the standard requirements: a qualified intermediary must hold the proceeds, the replacement property must be identified within 45 days of the relinquished property closing, and the exchange must close within 180 days.

California's unique wrinkle is the clawback rule under California Revenue and Taxation Code §18032. If you complete a §1031 exchange involving California-source property and subsequently sell the replacement property from outside California (having moved to a non-California state), California requires you to file an annual information return and will assert tax on the deferred gain when the replacement property is eventually sold, even if you are no longer a California resident. The original California gain does not escape the state by being rolled into an out-of-state replacement property. This matters for real estate investors who contemplate a §1031 exchange now and a state move later.

§1045 QSBS Rollover

Section 1045 provides a deferral mechanism distinct from the §1202 exclusion. If a non-corporate taxpayer sells QSBS held for more than six months but has not yet met the five-year holding period for the §1202 exclusion, §1045 allows the gain to be deferred by reinvesting the proceeds into replacement QSBS within 60 days. The gain carries over into the replacement stock, and the holding period tacks for the §1202 clock.

California conforms to §1045 (unlike §1202). The deferral works at both the federal and California level. This matters for early employees or founders who receive secondary market liquidity before the five-year mark: they can roll into replacement QSBS at a qualifying company and defer the California gain, then potentially plan around the California tax further down the line. The §1045 rollover is narrower than it sounds (you need to identify and close on replacement QSBS within 60 days, which is operationally difficult), but it is one of the few tools that actually reduces California's take on pre-five-year startup gains. Our equity compensation tax page covers the interaction with RSAs, ISOs, and NSOs in more detail.

Opportunity Zones: Federal Benefit, Partial California Problem

IRC §1400Z-2, enacted under the TCJA and extended under OBBBA 2025, allows taxpayers to defer and partially exclude capital gains by investing in Qualified Opportunity Funds (QOFs) that deploy capital into designated Opportunity Zones. The federal mechanics: reinvest gain into a QOF within 180 days, the original gain is deferred until December 31, 2026 (or earlier sale of the QOF interest), and appreciation on the QOF investment itself is excluded from federal tax if the QOF interest is held for at least ten years. OBBBA 2025 extended the ten-year exclusion benefit and redesignated certain expired Opportunity Zones.

California's conformity is partial and unfavorable. California does not conform to the deferral of the original gain. A California investor who sells Apple stock, realizes $2 million in long-term gain, and rolls into a QOF within 180 days defers the federal tax on that $2 million gain until 2026. California, however, requires recognition of the full $2 million gain in the year of sale, with no deferral. The California tax bill comes due on the original schedule.

California does conform to the exclusion of appreciation on the QOF interest itself for ten-year holders. So QOF investments can still make sense for California residents targeting appreciation within the QOF, but the original gain deferral that makes them particularly attractive at the federal level does not reduce the California current-year tax. Run the math before assuming an OZ investment solves your California problem.

Residency Planning: The Nevada Pre-Liquidity Play and Why It Is Not a Paper Transaction

The most common planning question we hear from Bay Area founders approaching a liquidity event is some version of: "Can I just move to Nevada or Texas first?" The short answer is yes, but "move" means move. It does not mean filing a change of domicile declaration, getting a Nevada driver's license, and continuing to work out of your Palo Alto home office.

California uses a facts-and-circumstances domicile test. The FTB aggressively audits high-income individuals who claim to have changed domicile shortly before a large capital gain event. The California Franchise Tax Board's residency determination guidance looks at a range of factors including where your primary home is located, where your spouse and minor children live, where your business activities are conducted, where your social and civic ties are centered, and where you spend the majority of your time. Having a Nevada mailing address while living and working in California does not change your California domicile.

For the Nevada play to work in a pre-liquidity-event context, you typically need: (1) to have established actual physical presence and domicile in Nevada well before the gain event, generally at least one to two years prior for a clean audit trail; (2) to have severed your California connections (resigned from California-based boards, moved your primary residence, changed your banking relationships, changed where your children attend school, shifted your social and professional activities); and (3) for the gain itself to not be California-source income.

That last point is critical for stock options and RSUs. California-source income from equity compensation is determined based on the ratio of California workdays during the period from grant to vest (for options) or grant to vesting (for RSUs). If you have been a California resident for years while the options were granted and vesting, California will assert a proportionate share of the gain as California-source income regardless of where you live at exercise. Moving to Nevada six months before a liquidity event and exercising five-year-old California-granted options does not escape California tax on the California-source portion. For genuinely California-source compensation-based equity, the time to plan is at grant, not at exit. See our discussion on equity compensation tax planning for the specifics on sourcing.

OBBBA 2025: What Changed for Capital Gains

The One Big Beautiful Bill Act (Public Law 119-21, signed July 4, 2025) made several changes relevant to capital gains planning for Bay Area investors:

• QSBS exclusion cap raised to $15 million for qualified stock issued after July 4, 2025, in designated high-growth industries. The five-year holding period and other §1202 requirements remain unchanged. California does not conform to this increase.
• Opportunity Zone redesignation. OBBBA extended and redesignated Opportunity Zones through 2035, and reset the ten-year clock for existing QOF investors in certain circumstances. The California non-conformity on the deferral of the original invested gain remains unchanged under OBBBA.
• NIIT threshold indexing. OBBBA indexed the NIIT thresholds to inflation for tax years beginning after December 31, 2025. The $200,000 and $250,000 thresholds, which had been frozen since 2013, will now adjust annually for CPI. For 2026, the adjusted thresholds are approximately $218,000 (single) and $272,000 (MFJ). This does not help most Bay Area investors for whom the NIIT applies at every income level they operate at, but it does matter for investors near the threshold.
• Wash sale rules clarified for certain digital assets. OBBBA formalized the application of §1091 wash sale rules to cryptocurrency and digital assets, closing the loss-harvesting window that had existed since crypto was not treated as a "security" under the prior statutory language. Digital asset tax-loss harvesting strategies that worked through 2024 are now subject to the same 30-day repurchase rule as stock.
• §174 domestic R&D immediate expensing restored under amended §174A, which affects startup founders whose business income and capital gains interact in the same year. See our full treatment of the §174 changes in our R&D credit guide.

Schedule D and Form 8949 Basics

At the federal level, capital gains and losses are reported on Schedule D of Form 1040, with the underlying transaction detail on Form 8949. Every sale of a capital asset goes on Form 8949 first, organized by short-term (Part I, Box A/B/C depending on whether a 1099-B was received) and long-term (Part II, Box D/E/F). The totals flow to Schedule D, which nets short-term and long-term activity, applies capital loss carryforwards, and computes the tax using the Qualified Dividends and Capital Gain Tax Worksheet.

Brokerage firms that issue 1099-Bs are required to report your cost basis for covered securities, but the 1099-B cost basis is often wrong. Wash sale adjustments may not be applied correctly across accounts at different brokers. RSU basis may be understated if the broker does not include the income included at vesting. Options exercise basis may exclude broker commissions. Reviewing your Form 8949 line by line against your own records before filing is not optional if you want accurate results.

California uses Schedule D (CA) on Form 540, which follows the same structure but starts from California-adjusted income figures. Differences in basis, exclusions, and deductions between federal and California treatment get reconciled on California Schedule CA (540).

Wash sales under §1091 deserve attention throughout the year, not just at filing. If you sell a stock at a loss and repurchase substantially identical stock within 30 days before or after the sale, the loss is disallowed and added to the basis of the replacement shares. With OBBBA 2025 extending this rule to digital assets, investors managing crypto positions across multiple exchanges need to track wash sale exposure just as they would for stock. See our guidance on retirement account tax planning for how IRAs interact with wash sale rules on taxable account positions.

FAQ

What is the top combined capital gains tax rate for a Bay Area investor in 2026?

For a California resident with income well above $1 million, the combined top rate on long-term capital gains is approximately 37.1 percent: 20 percent federal long-term rate, plus 3.8 percent NIIT, plus 13.3 percent California (12.3 percent top bracket plus the 1 percent Mental Health Services Act surcharge on income over $1 million). Short-term gains are taxed at ordinary income rates federally (up to 37 percent) plus California (up to 13.3 percent), for a combined rate approaching 50 percent for the highest earners.

Does California recognize the §1202 QSBS exclusion?

No. California does not conform to IRC §1202. Gain that is 100 percent excluded from federal gross income under §1202 is fully taxable in California as ordinary income at rates up to 13.3 percent. A California resident who excludes $10 million in QSBS gain federally still owes approximately $1.33 million to California. This is one of the most significant and frequently underestimated California tax exposures for Bay Area founders. The §1045 rollover does conform at the California level and can defer (but not exclude) California gain in certain circumstances.

Does moving to Nevada before a liquidity event actually work?

It can work if the move is genuine, well-documented, and completed well before the gain event. California's domicile test is facts-and-circumstances, not a paper filing. The FTB audits high-income domicile changes aggressively. You need actual physical presence in the new state, severed California connections, and a clean timeline. For equity compensation gains, California sourcing rules allocate a portion of the gain based on days worked in California during the vesting period, regardless of where you live at exercise. Moving six months before an exit on five-year-vesting options does not eliminate the California-source fraction of that gain.

What is the NIIT and does it apply to California residents?

The Net Investment Income Tax is a 3.8 percent federal surtax on investment income (capital gains, dividends, interest, passive income) for individuals with modified AGI above $200,000 (single) or $250,000 (MFJ). Those thresholds are now indexed to inflation for 2026 and beyond under OBBBA 2025, rising to approximately $218,000 and $272,000 for 2026. The NIIT applies to California residents in the same way it applies to residents of any state. California has no equivalent tax, but the NIIT is a federal obligation that California residents pay in full.

Can I use a §1031 exchange to defer capital gains on investment property in California?

Yes. California conforms to federal §1031 for real property exchanges. The exchange defers both federal and California capital gains tax on the relinquished property, provided the exchange meets all standard requirements (qualified intermediary, 45-day identification, 180-day close). However, California's clawback rule under RTC §18032 applies if you later sell the replacement property from outside California. California will require current recognition of the original deferred gain when the replacement property is sold, even if you are no longer a California resident at that time. The deferral is real but the California gain follows the asset.

What did OBBBA 2025 change for California capital gains planning?

OBBBA 2025 raised the federal §1202 QSBS exclusion cap from $10 million to $15 million for stock issued after July 4, 2025, extended and redesignated Opportunity Zones, began indexing NIIT thresholds to inflation, and applied wash sale rules to digital assets. California conforms to none of the QSBS changes and does not conform to the OZ original-gain deferral. The NIIT threshold indexing is a federal-only change with no California parallel. The wash sale extension to digital assets is a federal change that California will need to address in its own conformity legislation; absent explicit California action, the treatment may differ. Coordinate with your advisor before relying on any OBBBA provision for California planning.

Working Through This Before the Event

California capital gains planning is almost entirely front-loaded. Once a sale closes, most of the options close with it. The tax on a $10 million QSBS gain is essentially fixed the moment you sign the acquisition agreement. The residency picture is fixed by years of prior history. The §1031 exchange clock starts at closing. The NIIT calculation follows from the transaction itself.

What can be planned in advance: holding period management (ensuring you cross the one-year LTCG line and the five-year QSBS line before triggering gain), installment sale structures where a buyer will agree, charitable remainder trust strategies for highly appreciated assets, opportunity zone planning for the gain that California taxes currently, and domicile changes executed early enough to be credible. For real estate, the timing of depreciation recapture and the structure of the exchange chain both require advance work.

At Silicon Valley Tax, we work through capital gains scenarios for Bay Area investors, founders, and executives across the full spectrum from pre-IPO equity planning to real estate portfolio optimization. Our equity compensation tax service and our broader individual tax planning work both engage with the California-federal interaction described in this guide. If you have a transaction on the horizon or a portfolio position that has grown large enough to matter, the time to model the tax is now, not at filing in April.

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