The pitch for Qualified Small Business Stock is simple: sell your startup shares after five years and exclude up to $15 million of federal capital gain per company, per taxpayer, with a 0% federal tax rate on what qualifies. At a 23.8% combined long-term capital gains and net investment income tax rate, that is a federal saving of up to $3.57 million on a single exit, on top of whatever you made from building the company. Nothing else in the tax code comes close for early-stage founders and employees.
The trap is equally simple: the choices that determine whether your shares qualify were made at company formation and at the moment of issuance. If the company was not a C-corporation when your stock was issued, if its gross assets exceeded $50 million, if you bought the shares on the secondary market rather than directly from the company, or if you held for fewer than five years before selling, none of the exclusion applies. These gates are binary. Partial qualification does not exist. And most of them cannot be fixed retroactively.
This page lays out how Silicon Valley Tax thinks about Section 1202 planning for founders, early employees, and VC-backed companies across the Bay Area. We cover the qualification mechanics, the five-year holding period and its tacking rules, the events that blow up a qualifying position, the Section 1045 rollover for early exits, the 2025 OBBBA changes, California's refusal to conform to the federal exclusion, and the stacking strategies that multiply the exclusion across family members and trusts. If you have founders stock, early ISO exercises, or a cap table of QSBS-eligible shares heading toward an exit, this is the framework you need to understand before you act.
Section 1202 of the Internal Revenue Code allows a non-corporate taxpayer to exclude 100% of the gain from the sale of Qualified Small Business Stock held for more than five years. The exclusion applies to the greater of $10 million per taxpayer per issuing corporation, or ten times the taxpayer's adjusted basis in the stock of that corporation. The 2025 One Big Beautiful Budget Act confirmed these limits and made technical clarifications affecting AI and technology companies (discussed below). For a complete breakdown of what the OBBBA changed across QSBS, §199A, §174, SALT, and estate planning, see our OBBBA 2025 overview.
The 100% exclusion applies to stock issued after September 27, 2010. Stock issued between February 18, 2009 and September 27, 2010 is 75% excludable; stock issued between August 11, 1993 and February 17, 2009 is 50% excludable. Almost all venture-backed stock currently in circulation falls under the 100% exclusion.
The excluded gain is also exempt from the net investment income tax under Section 1411, meaning the effective federal rate on excluded QSBS gain is genuinely zero, not a reduced rate. The gain is, however, still includable in California adjusted gross income, because California does not conform to Section 1202 at all. For a Bay Area founder, the state tax reality is a separate and substantial issue discussed in the multi-state section below.
For stock to be QSBS, it must pass four tests evaluated primarily at the time of issuance. Get through all four gates and the five-year clock starts. Miss any one and the stock is ordinary capital stock with no Section 1202 benefit, no matter how long you hold it.
The issuing entity must be a domestic C-corporation at the time of issuance. S-corporations, LLCs, partnerships, and foreign entities do not qualify. This requirement has a sharp implication for the Bay Area startup formation pattern: many early-stage companies form as LLCs for simplicity and later convert to C-corporations to accept venture financing.
When an LLC converts to a C-corporation, the conversion is treated as a deemed exchange under Section 351. Shares received in that exchange can start a new QSBS holding period from the conversion date, provided the resulting C-corporation meets all other qualification tests at that moment. Stock held in the LLC before conversion does not count toward the QSBS five-year clock. Founders who converted a mature LLC to a C-corp may find their clock is much shorter than they assumed. If you are contemplating an LLC-to-C conversion for a company approaching a financing round, the timing of that conversion relative to stock issuances matters directly to Section 1202 eligibility.
The corporation's aggregate gross assets must not have exceeded $50 million immediately before and immediately after the issuance. Gross assets for this purpose means the tax basis of all assets, not fair market value, plus cash. For seed and Series A companies this threshold is rarely a concern. For late-stage Series C or D companies that have raised substantial capital, it can be. The test is applied at every individual issuance, not to the company as a whole at a point in time. A founder who received shares at a $3 million seed round easily passes; an employee who received shares in a $150 million Series C option grant may not, depending on the company's asset base.
One nuance: the $50 million ceiling is not a lifetime cap. A company can have exceeded $50 million in gross assets at some points without disqualifying all of its shares. It disqualifies only the shares issued while gross assets exceeded the threshold. Cap table management and the timing of equity grants matter more than most founders realize for this reason.
During substantially all of the taxpayer's holding period, the corporation must use at least 80% of its assets in the active conduct of a qualified trade or business. Disqualified industries under Section 1202(e)(3) include professional services (health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting), financial services, banking, insurance, leasing, investing, farming, natural resources, and hospitality (hotels and restaurants).
The 2025 OBBBA added clarifying language relevant to artificial intelligence and pure-technology companies. Companies whose principal asset is software, proprietary technology, or data models now have clearer safe-harbor treatment under the active business test, resolving an ambiguity that had put some AI startups at risk of being characterized as a "consulting" or "service" business if their revenue came from professional implementation services rather than licensed software. If your company operates in a gray area between software product and consulting services, the post-OBBBA analysis matters for your Section 1202 position.
QSBS must be acquired at original issuance directly from the corporation, in exchange for money, property, or services. Secondary-market purchases do not qualify. This rule is absolute: a share acquired from a departing co-founder, purchased in a secondary tender, or bought on a trading platform is never QSBS regardless of how long it is held. Founders who receive stock directly from the company, employees who receive ISO or NSO grants exercised into shares from the company, and early investors who write checks directly into a priced round are all original issuance acquirers. An angel who purchases shares from another angel is not.
Assuming the stock passes all four issuance gates, the holder must own it for more than five years before sale. The start date of that five-year clock depends on how the shares were acquired.
For founders with restricted stock and a timely Section 83(b) election filed within 30 days of issuance, the clock starts at the issuance date. For founders who failed to file an 83(b) election on unvested shares, the clock starts at each vesting tranche (when the property rights transferred under Section 83(a)), which can push the five-year window substantially later.
For ISO holders, the QSBS clock starts at exercise, not at grant. This is the single most consequential timing fact for pre-IPO employees: if you wait until the company files its S-1 or announces an acquisition to exercise your ISOs, your QSBS clock restarts at that point. You may hold the resulting shares through the IPO lockup, through two or three years of post-IPO selling windows, and still be short of the five-year mark when you sell. The staggered early exercise strategy described in our pre-IPO tax planning guide exists in large part because of this mechanics point.
For NSO holders, the clock also starts at exercise. NSO exercise generates W-2 ordinary income on the spread at exercise, and that same exercise date becomes day one of the QSBS five-year period. The NSO spread cost and the QSBS clock consideration should be modeled together when planning exercise timing.
Section 1045 allows a taxpayer who sells QSBS before the five-year period has run to defer the gain by rolling the proceeds into replacement QSBS within 60 days. Critically, the holding period of the original QSBS is tacked to the replacement shares. If you held QSBS for three years and rolled the proceeds into new QSBS, the replacement shares are treated as held for three years from day one. This means a founder who participates in an early liquidity round before the five-year mark can preserve most of the QSBS benefit by rolling the proceeds rather than recognizing taxable gain.
The 60-day window is firm. The replacement must itself qualify as QSBS at issuance. The rollover is elective and must be reported on your tax return for the year of the sale. Basis tracking across a rollover chain can become complex quickly, particularly if multiple rollovers have occurred. We document each rollover position with a QSBS basis log that ties to cap table snapshots and investment records, so the tacking chain is auditable from inception.
In a Section 351 exchange or a Section 368 reorganization (merger, acquisition, or restructuring), a taxpayer may exchange QSBS for stock in the acquiring corporation. Whether the holding period tacks to the new shares depends on the type of reorganization and whether the new shares themselves meet QSBS qualification requirements as of the exchange. In a qualifying reorganization where the new shares satisfy the QSBS tests, tacking is permitted and the combined holding period carries forward. In an acquisition where the acquirer is a large public company that fails the $50 million gross assets test, the new shares do not qualify and no tacking is possible. The sale of the old QSBS in the reorganization may itself trigger gain recognition that should be analyzed for Section 1202 exclusion eligibility at that point.
Many late-stage private companies conduct tender offers in which investors or the company itself buys shares from employees at a set price. Participating in a tender offer is a sale. If your QSBS shares have not yet crossed the five-year mark at the tender date, you have triggered a taxable gain without the Section 1202 exclusion. Worse, if you sell most of your QSBS position in a tender before year five and roll only the remainder, you must trace each share lot independently. We have seen founders lose hundreds of thousands of dollars by selling in a year-four tender one month before their five-year anniversary. The tender offer evaluation and the QSBS five-year check belong in the same analysis.
Qualification does not end with issuance. Certain corporate actions taken after issuance can retroactively strip QSBS status from shares that otherwise would have qualified.
Significant redemptions within two years before or four years after issuance. If the corporation purchases more than 5% of its outstanding stock by value from any shareholder within the two-year window before your stock was issued, or within four years afterward, your shares may be disqualified. The redemption exclusion is designed to prevent companies from using QSBS as a disguised return of capital. It trips founders when a co-founder buyout or an early investor redemption happens to fall within the four-year post-issuance window. It also catches companies that repurchase shares as part of tender offers or structured liquidity programs within the restricted period.
Distributions to shareholders exceeding the company's earnings and profits during the restricted period. Large preferred dividends, return-of-capital distributions, or other shareholder payments that are not ordinary compensation can implicate this rule.
Entity type changes. If the C-corporation converts to an LLC, S-corporation, or other pass-through entity during your holding period, your shares lose QSBS status as of the conversion date. A partial conversion or a check-the-box election that changes entity classification mid-hold has the same effect. This catches founders who restructure the company for operational reasons without understanding the tax consequence.
Failure to maintain the active business test during the holding period. If the company shifts its asset base into passive investments, financial instruments, or disqualified industries at any point during the holding period, QSBS status may be lost prospectively from that date. This matters for companies that pivot their business model, acquire financial assets after a large funding round, or transition from product to consulting-heavy revenue during the five-year window.
Not every founder can hold QSBS for a full five years before an exit materializes. An acquisition offer in year three or a company-sponsored liquidity event in year four puts the founder in a position of either paying full capital gains tax on the sale or finding qualifying replacement QSBS to roll into within 60 days.
The mechanics: the founder sells the QSBS shares before the five-year mark, recognizing a gain. Within 60 days, the proceeds (at least an amount equal to the amount realized) must be invested in stock that qualifies as QSBS at the time of the replacement investment. The realized gain is then deferred until the replacement QSBS is eventually sold, at which point the tacked holding period may make the combined position eligible for the Section 1202 exclusion.
Practical constraints are significant. The replacement QSBS must be in a different company (you cannot roll proceeds back into the same issuer). The replacement company must independently satisfy all four QSBS qualification gates at the time of the replacement issuance. And the 60-day window runs from the sale date, not from when proceeds clear or when you receive wires. In practice, founders executing a Section 1045 rollover often coordinate directly with a portfolio company in their network that is raising a priced round within the 60-day window.
Basis in the replacement shares equals the proceeds invested minus the deferred gain. This can create counterintuitive basis positions where high-value shares carry a very low tax basis, generating large eventual gain on sale. The rollover chain must be documented clearly on Form 8949 in every year it is in effect, and the basis ledger must be maintained through any subsequent rollovers or holding-period events.
The One Big Beautiful Budget Act of 2025 made several changes affecting Section 1202. The headline is that the statute was preserved, and the 100% exclusion for stock issued after September 27, 2010 was confirmed without a sunset. Several technical provisions were clarified or modified.
The active business test received the most substantive update. The OBBBA added explicit language confirming that companies whose primary product is software, a proprietary AI model, or a technology platform are conducting a qualified trade or business under Section 1202(e), provided that the company's assets are principally the technology itself rather than professional services delivered by employees. This addressed a growing concern in the Bay Area AI startup community that companies generating revenue from implementation consulting or model fine-tuning services for enterprise clients might be categorized as performing arts or consulting under the disqualified-industries list. Post-OBBBA, a company selling licenses to its AI software clearly qualifies; a company selling professional services delivered by its engineers to implement that software faces more analysis.
The OBBBA did not increase the $10 million per-taxpayer-per-issuer exclusion cap, which had already been set at the greater of $10 million or 10 times basis. However, the stacking strategies described in the next section were not disturbed by the legislation, and the practical effective exclusion available to a founding family can far exceed the nominal $10 million cap.
California is one of a small number of states that explicitly decoupled from the federal Section 1202 exclusion. California Revenue and Taxation Code Section 18152.5 conforms to Section 1202 only for the 50% exclusion available for stock issued between 1993 and 2009. For stock issued after February 17, 2009 (which includes virtually all current venture-backed QSBS), California provides zero exclusion. The full gain is taxable at California's top capital gains rate, which is 13.3% for income over $1 million (combined regular and mental health services tax).
On a $10 million QSBS gain excluded federally, the California tax bill is approximately $1.33 million. This is real, it is unavoidable if you are a California resident at the time of sale, and it should be modeled into every QSBS exit analysis. The federal exclusion is still enormously valuable even net of California state tax, but the California reality must be part of the exit planning conversation from the beginning.
For founders approaching a liquidity event where the federal QSBS exclusion is in place and the California tax on the remaining gain is substantial, residency planning is worth analysis. Texas, Nevada, Florida, Washington, and Wyoming have no state income tax. A taxpayer who establishes domicile in one of those states prior to the sale date will pay no state income tax on the QSBS gain regardless of the California exclusion gap.
California takes residency analysis seriously and aggressively audits high-income departures. The standard for domicile change is not simply purchasing property in another state or spending 183 days outside California. The Franchise Tax Board examines the totality of ties: where your closest personal and business relationships are, where your primary home is, where you spend your time, the location of your social and professional networks, voter registration, driver's license, and the nature of your connections to California versus the destination state. For a founder with a Bay Area company, Bay Area family, Bay Area social network, and a California office, a paper residency change to Nevada six months before a sale is unlikely to withstand FTB scrutiny.
Effective residency planning for a material QSBS exit typically requires a genuine move of at least 12 to 18 months before the anticipated sale, severing substantive California ties, and maintaining contemporaneous documentation of the new domicile. Founders who are willing and able to make a genuine lifestyle change to a no-income-tax state as part of their pre-exit planning can save millions in California tax on top of the federal exclusion. Founders who cannot genuinely relocate should model the California tax as a cost of the exit and not attempt a paper move.
For exits where the gain is very large and the California tax is correspondingly large, trust-based strategies may be available. A Nevada incomplete-gift non-grantor trust, sometimes called a NING trust, allows a California grantor to transfer appreciated assets (including QSBS) to a properly structured Nevada trust that is treated as a separate taxpayer for California income tax purposes but not for federal tax purposes. If properly structured and funded before the sale, the California gain may be taxable to the trust rather than to the individual grantor, and California may not be able to tax the trust's income if the trust has no California-source income, no California trustees, and no California beneficiaries.
These strategies are complex, fact-specific, and the California Franchise Tax Board has challenged and continues to challenge certain trust structures aggressively. They are worth analysis for exits in the tens of millions of dollars range; they are not appropriate for most founders. We discuss this category of planning in the context of a specific engagement, not as a general recommendation.
The $10 million exclusion cap (or ten times basis) under Section 1202 applies per taxpayer per issuing corporation. The statute does not prevent multiple taxpayers from each holding their own QSBS positions in the same company, with each position qualifying independently for up to $10 million of exclusion. This creates the primary stacking strategy used in QSBS planning for material exits.
A founder who holds $40 million of QSBS gain can gift shares to a spouse (no gift tax on spousal transfers), adult children, and irrevocable non-grantor trusts. Each transferee holds their own independent QSBS position. When the exit occurs, each taxpayer excludes up to $10 million of gain independently. A founding couple with two adult children and two grantor-excluded trusts could potentially shelter $60 million or more in federal gain across six taxpayers, each using their own $10 million cap.
The mechanics require attention to the original issuance requirement and the gift basis rules. QSBS received by gift retains its QSBS character in the hands of the donee; this is confirmed by the statute. The donee's holding period includes the donor's holding period (tacking applies to gifts). For irrevocable trusts, the trust must be a non-grantor trust for the separate taxpayer analysis to hold; a grantor trust is transparent and counted as the grantor's position for this purpose.
Gift timing matters. Gifts made close to a sale event raise scrutiny under step-transaction doctrine if the donee immediately sells the QSBS. The donee should be a genuine holder of the shares with meaningful autonomy over the sale decision. For planning purposes, gifts should occur well before any definitive sale agreement is signed.
A charitable remainder trust is a split-interest trust where the donor transfers appreciated assets to the trust, which sells the assets and reinvests the proceeds without recognizing capital gain at the trust level. The donor (and potentially a non-spouse beneficiary) receives an income stream from the trust for a term of years or life, and the remainder passes to a designated charity at the end of the trust term. Because the CRT is a tax-exempt entity, it does not pay capital gains tax on the sale of the QSBS.
The use of QSBS inside a CRT involves careful analysis: the CRT must be properly structured to avoid classification as a grantor trust, the Section 1202 exclusion does not apply inside a CRT (because the trust, not the donor, is the seller), but the CRT's tax-exempt status achieves similar economic deferral for the portion contributed. For very large QSBS exits where the founder wants both federal exclusion on one portion of the shares and charitable legacy planning on another portion, a combined strategy of direct sale under Section 1202 plus CRT contribution of a separate tranche is sometimes worth modeling.
Section 1202 exclusions are claimed on Form 8949 (Sales and Other Dispositions of Capital Assets) and Schedule D, with the excluded gain reported on line 2 of the Schedule D with code "Q" in the description field. The IRS has issued guidance indicating it will scrutinize large Section 1202 exclusion claims, and the documentation burden sits entirely on the taxpayer.
The records you need to maintain to support a QSBS claim include:
Silicon Valley Tax maintains a QSBS documentation file for each client with a material QSBS position, updated annually and coordinated with the company's stock plan administrator. If an IRS examination arises, a well-maintained file reduces the examination to a document production exercise rather than a reconstructed fact-finding exercise under adversarial conditions.
A QSBS engagement with Cooper Hathaway and Alfonso Nuñez, Managing Partners at Silicon Valley Tax, typically follows this structure:
Our broader equity compensation tax practice handles RSU, ISO, NSO, and ESPP planning in parallel with QSBS work, and our business tax consulting practice can coordinate entity-level and shareholder-level planning for founding teams that include both individual holders and trust or entity holders of QSBS. Additional context on pre-IPO mechanics is at our pre-IPO tax planning page; the deeper QSBS mechanics are in our QSBS blog post.
Four tests apply. First, the company must have been a domestic C-corporation when your stock was issued. LLCs and S-corporations do not qualify. Second, the company's aggregate gross assets (tax basis, not fair market value) must not have exceeded $50 million at the time of your issuance. Third, the company must have been actively conducting a qualified trade or business and must continue to do so during your holding period. Professional services firms in law, medicine, financial services, consulting, and hospitality are disqualified; software and technology companies generally qualify. Fourth, you must have acquired the stock at original issuance directly from the company, not in a secondary transaction. We verify all four gates at the beginning of every QSBS engagement before advising on any downstream strategy.
Yes, through two mechanisms. The first is the basis multiple: the exclusion cap is the greater of $10 million or ten times your adjusted basis in the stock. If you put $2 million into a company and that investment grew to $50 million, ten times your $2 million basis equals $20 million, which exceeds $10 million and becomes your exclusion cap. The second is stacking: the $10 million cap applies per taxpayer per issuing corporation. A spouse, adult children, and non-grantor trusts each have their own $10 million cap on QSBS from the same issuer. A founding family using both mechanisms can shelter substantially more than $10 million of gain on a single exit.
No. California conforms to the 50% exclusion available for stock issued before February 18, 2009, but provides zero exclusion for stock issued after that date, which covers all modern venture-backed QSBS. If you are a California resident at the time of sale, the full gain is taxable at California rates (top rate 13.3%) regardless of the federal exclusion. A $10 million federal exclusion still saves roughly $2.38 million in federal tax even with California's full tax on the gain. That savings is real and worth protecting. The California tax does not erase the value of QSBS planning; it reduces it, and the reduction should be modeled accurately rather than ignored.
You lose the Section 1202 exclusion on that sale. The gain is taxable as long-term capital gain if you have held for more than one year. Your options are to recognize the gain and pay capital gains tax, or to use Section 1045 to roll the proceeds into replacement QSBS within 60 days. The Section 1045 rollover defers the gain and tacks the original holding period to the replacement shares, preserving the path to eventual Section 1202 exclusion. The 60-day window is strict and the replacement must independently qualify as QSBS at the time you invest. Planning for this possibility before a sale occurs is much easier than scrambling to find qualifying QSBS after a sale closes.
Generally no. RSUs are grants of company stock that vest over time and are taxed as ordinary income at vesting. The shares received at RSU vesting are issued by the company and might technically satisfy the original-issuance requirement, but the RSU structure means the shares are not acquired in exchange for money or property in the traditional sense, and the holding period for QSBS purposes starts at vesting, not at grant. More importantly, by the time RSUs are granted at large, late-stage companies, the company's gross assets almost certainly exceed the $50 million threshold, which eliminates QSBS eligibility entirely. RSU planning focuses on ordinary income management, not Section 1202 exclusion. QSBS analysis is most relevant for founders with restricted stock, employees with early ISO exercises at seed or early-stage companies, and early investors.
The holding period tacks when QSBS is received as a gift. The donee includes the donor's holding period in their own holding period calculation. If the donor had held QSBS for three years before gifting, the donee starts with three years of credited holding period. The QSBS character also transfers; stock that qualified as QSBS in the donor's hands continues to qualify in the donee's hands. The donee's exclusion cap is the donee's own $10 million limit, independent of the donor's. Basis in gifted shares carries over at the donor's basis for purposes of the gain exclusion, which matters for the ten-times-basis alternative cap calculation.
Three categories of corporate events can eliminate QSBS status retroactively or prospectively after issuance. First, significant share redemptions by the company within two years before or four years after the date your shares were issued can disqualify your shares under the Section 1202(c)(3) redemption rules. Second, entity type changes that convert the C-corporation to an LLC, S-corporation, or other pass-through during your holding period destroy QSBS status from the conversion date forward. Third, failure of the active business test at any point during the holding period if the company shifts its asset base into passive investments or enters a disqualified industry affects QSBS status for shares held during that period. Monitoring corporate-level events throughout the holding period is part of ongoing QSBS maintenance, not a one-time check.
At company formation, and again at every new equity issuance. The qualification gates are evaluated at issuance, and many of the most consequential choices (C-corporation status, LLC-to-C conversion timing, option grant sizes relative to the $50 million gross assets threshold) are made before you know whether the company will become valuable enough to make QSBS matter. The cost of QSBS-aware formation and equity plan design is minimal. The cost of discovering at exit that your stock does not qualify because of a fixable structural issue made five years earlier is measured in millions of dollars of avoidable tax. The right time to do the QSBS analysis is now, not when a term sheet arrives.
The federal tax benefit available under Section 1202 is one of the most valuable in the code, and it is entirely dependent on choices made at company formation and equity issuance. A tax and accounting firm with CPAs on staff that understands QSBS from the inside out can mean the difference between a tax-free exit and a $2 million federal tax bill that did not have to happen. Cooper Hathaway and Alfonso Nuñez work with Bay Area founders and early-stage teams across the full equity lifecycle, from seed-stage QSBS eligibility reviews through multi-round exit modeling and stacking strategy. Book a complimentary consultation or call us at (408) 383-9870 to review your QSBS position before the next round closes or the next liquidity event arrives.
A complimentary consultation with Cooper Hathaway or Alfonso Nuñez takes an hour. Discovering your stock did not qualify at exit costs far more. Start the QSBS eligibility review now, before the next round closes or the next liquidity event arrives.