Qualified small business stock offers one of the most powerful tax benefits available to investors in the U.S. tax code. Under Section 1202, investors who purchase qualified small business stock in eligible companies and hold it long enough can exclude up to 100% of their capital gains from federal income tax. For founders, early employees, and angel investors, this provision can mean the difference between a seven-figure tax bill and paying nothing at all on a successful exit.
The benefit became permanent under the PATH Act of 2015, and it expanded substantially in 2025. The One Big Beautiful Bill Act, signed into law on July 4, 2025, raised the dollar caps, increased the company size limit, and introduced a tiered holding period that lets some investors claim a partial exclusion in as little as three years. Qualified small business stock has become a cornerstone of long-term tax planning for anyone investing in early-stage C corporations.
This article answers a single practical question: how can an investor or founder qualify for and maximize the Section 1202 capital gains exclusion under current law? The guidance below pairs well with the kind of forward-looking tax advisory services that should accompany any significant equity position.
What is qualified small business stock under Section 1202?
Qualified small business stock is stock issued by a domestic C corporation that meets specific size and activity requirements set out in Internal Revenue Code Section 1202. For stock issued after July 4, 2025, the corporation must have aggregate gross assets of no more than $75 million at any time through the moment immediately after the stock is issued. Stock issued on or before that date remains subject to the prior $50 million limit. In both cases, the company must use at least 80% of its assets in an active trade or business.
The stock must be acquired at original issuance, meaning the investor purchases shares directly from the company rather than on a secondary market. This requirement ensures the tax benefit flows to investors who are actually providing capital to small businesses, not to traders buying and selling existing shares.
Section 1202 was originally enacted in 1993 to encourage investment in small enterprises. Congress later raised the exclusion percentage from 50% to 75% and eventually to 100%, then expanded the provision again in 2025. These steps reflect a long-running, bipartisan view that directing capital toward small businesses strengthens the broader economy.
How the capital gains exclusion works
The Section 1202 capital gains exclusion lets an investor exclude from federal income tax the greater of a fixed per-issuer cap or 10 times the adjusted basis of the stock. The fixed cap depends on when the stock was acquired. For qualified small business stock acquired after July 4, 2025, the per-issuer cap is $15 million, and it will be adjusted for inflation for tax years beginning after 2026. For stock acquired on or before that date, the cap is $10 million.
A simple example shows how the alternative limits interact. If you acquired $500,000 of post-2025 qualified small business stock, the 10-times-basis figure would be $5 million. Because the law lets you use the greater of the two amounts, you could exclude up to $15 million rather than the smaller basis-driven figure. Investors with very large basis use the 10-times-basis test instead, which can exceed the fixed cap.
The 2025 law also changed the holding period. For stock acquired after July 4, 2025, Section 1202 now uses a tiered structure: stock held at least three years qualifies for a 50% exclusion, stock held at least four years qualifies for a 75% exclusion, and stock held at least five years qualifies for the full 100% exclusion. Stock acquired on or before July 4, 2025 follows the prior rule, under which the investor must hold for more than five years to claim any exclusion, with no partial credit for shorter periods.
One often-missed advantage is that gain excluded under Section 1202 is also excluded from the 3.8% net investment income tax, because that surtax does not reach gain left out of gross income. For a fully excluded gain, the combined effect can be zero federal tax, a result few other investment structures match at this scale. The IRS addresses how capital gains are reported on Schedule D and Form 8949 in its Topic 409 capital gains guidance, which investors should review before filing.
QSBS eligibility requirements every investor should know
Meeting the QSBS eligibility requirements demands attention to several overlapping conditions. The issuing corporation must be a C corporation organized under the laws of any U.S. state. S corporations, partnerships, and LLCs taxed as partnerships do not qualify, even if they otherwise meet the size and activity tests.
The gross asset test applies on a cumulative basis. The corporation’s aggregate gross assets, meaning cash plus the adjusted basis of other property, must not exceed the applicable cap at any point before or immediately after the stock issuance. That cap is $75 million for stock issued after July 4, 2025 and $50 million for earlier issuances. Rapidly growing startups that raise large funding rounds can cross this threshold, so tracking asset levels at each round is essential.
The active business requirement excludes certain industries. Companies whose principal activity falls in the following sectors generally cannot issue qualified small business stock:
- Professional services that depend on the reputation or skill of employees (health, law, engineering, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage services)
- Banking, insurance, financing, leasing, and investing
- Farming
- Mining and natural resource extraction eligible for percentage depletion
- Operating a hotel, motel, or restaurant
At least 80% of the corporation’s assets, measured by value, must be used in a qualifying active trade or business during substantially all of the investor’s holding period. Passive investment portfolios, most rental real estate, and pure holding companies generally fail this test.
Why the PATH Act and the 2025 law made QSBS more attractive
Before the Protecting Americans from Tax Hikes (PATH) Act was signed into law in December 2015, the 100% exclusion had been a temporary provision that Congress renewed in short increments. This created uncertainty for investors and founders who needed to plan five or more years ahead but could not be sure the full exclusion would still be in effect at exit.
The PATH Act resolved that problem by making the 100% exclusion permanent for qualified small business stock acquired after September 27, 2010. It also made permanent the rule that keeps excluded QSBS gain from being treated as a preference item for alternative minimum tax purposes. That change protected the full value of the benefit for high-income taxpayers, who might otherwise have seen part of it recaptured under the AMT.
The One Big Beautiful Bill Act went further in 2025. It raised the company size limit to $75 million, increased the per-issuer cap to $15 million, and added the three-tier holding period that allows partial exclusions before the five-year mark. With these expanded terms, tax advisors now routinely structure early-stage investments to satisfy Section 1202 from day one rather than treating the exclusion as a possible bonus.
Tax planning strategies to maximize your QSBS benefit
Strategic planning can significantly expand the total exclusion available to a family or investor group. Because the per-issuer exclusion limit applies separately to each taxpayer, married couples who each hold qualifying stock can each claim a separate cap if the stock is properly allocated, effectively doubling the available exclusion.
Gifting QSBS to family members before a sale is another common technique. Each recipient generally inherits the donor’s holding period and basis, and each has access to a separate per-issuer cap. A founder who gifts shares to children or to non-grantor trusts can multiply the available exclusion across several taxpayers, a strategy often called stacking.
Investors should also consider the Section 1045 rollover provision. If an investor sells QSBS held for more than six months but not yet long enough to claim an exclusion, they can defer the gain by reinvesting the proceeds into new qualified small business stock within 60 days. The rollover tacks the prior holding period onto the replacement stock, helping the investor reach the holding period needed for the exclusion.
Careful entity structuring matters as well. Because only C corporation stock qualifies, founders who initially form LLCs or S corporations may want to convert to C corporation status before issuing stock to investors. The conversion timing affects whether the stock meets the original issuance requirement, and coordinating that decision with experienced accounting services helps confirm the basis and asset records support a future exclusion claim.
Risks and limitations investors should weigh
The QSBS tax exemption is not without constraints. The holding period still matters a great deal. Startups are inherently risky, and locking up capital for several years without liquidity introduces real risk that the investment could lose value before the holding period needed for the full exclusion is complete.
State tax treatment varies widely. While federal law provides up to a 100% exclusion, not all states conform. California, for example, does not recognize the Section 1202 exclusion and taxes QSBS gains the same as other capital gains. Investors in high-tax states should model the combined federal and state impact before relying solely on the federal benefit.
The gross asset cap can also create complications for fast-growing companies. A startup that raises a large later-stage round may breach the applicable threshold, disqualifying future stock issuances. Existing shares issued before the breach remain eligible, but new investors in those later rounds may not benefit.
Tax consequences should never be the sole factor in an investment decision. Qualified small business stock offers meaningful advantages, but the underlying business must still represent a sound investment. Due diligence on the company’s fundamentals, including market opportunity, team, revenue trajectory, and competitive position, remains essential.
Frequently Asked Questions
What is qualified small business stock (QSBS)?
Qualified small business stock is stock issued by a domestic C corporation that uses at least 80% of its assets in an active trade or business and stays under the gross asset limit ($75 million for stock issued after July 4, 2025, or $50 million for earlier stock). Under Section 1202 of the Internal Revenue Code, investors who hold QSBS long enough can exclude up to 100% of their capital gains from federal income tax.
How much capital gains tax can you exclude with Section 1202?
Section 1202 allows an investor to exclude the greater of a per-issuer cap or 10 times their adjusted basis in the stock. The per-issuer cap is $15 million for stock acquired after July 4, 2025 and $10 million for stock acquired earlier. For stock acquired after September 27, 2010 and held long enough, the exclusion can reach 100%, leaving the qualifying gain free from federal income tax and the 3.8% net investment income tax.
What are the QSBS eligibility requirements?
The issuing company must be a domestic C corporation that stays under the applicable gross asset cap and uses at least 80% of its assets in a qualifying active trade or business. The investor must acquire the stock at original issuance and meet the holding period. Certain industries, including most professional services, banking, and farming, are excluded.
How long must you hold QSBS to claim the exclusion?
It depends on when you acquired the stock. For QSBS acquired after July 4, 2025, a three-year hold gives a 50% exclusion, a four-year hold gives 75%, and a five-year hold gives the full 100%. For QSBS acquired on or before July 4, 2025, you must hold for more than five years to claim any exclusion.
Does every state recognize the QSBS tax exemption?
No. While the federal exclusion can reach 100% for qualifying stock, state conformity varies. Some states, including California, do not recognize Section 1202 and tax QSBS gains as ordinary capital gains. Other states fully or partially conform. Investors should consult a tax advisor about their specific state’s treatment.
What happens if a company exceeds the gross asset limit?
Stock issued before the company’s assets exceeded the applicable limit remains eligible for Section 1202 treatment, assuming all other requirements are met. Stock issued after the threshold is crossed does not qualify. Tracking gross assets at each issuance date is critical for preserving QSBS eligibility.
