What is QSBS, and how can founders exclude millions in tax?
Last reviewed: July 2026
QSBS, or qualified small business stock, lets founders and early investors exclude up to $10 million (or 10 times their original basis, whichever is greater) of federal capital gain per company under Section 1202 of the Internal Revenue Code. For QSBS issued after July 4, 2025, the One Big Beautiful Bill Act (OBBBA) raised that cap to $15 million and added partial exclusions for shorter holding periods. Often called the startup founder tax break, this capital gains exclusion only works if the company, the stock, and the founder all clear a long list of conditions before the sale ever happens.
On This Page
- Key Takeaways
- What Is Qualified Small Business Stock (QSBS), and How Does Section 1202 Work?
- Which Companies and Shareholders Qualify for QSBS?
- How Much Can Founders Actually Exclude from Tax Under QSBS?
- What Did the OBBBA Change About QSBS for Stock Issued After July 4, 2025?
- Where Do Founders Most Often Lose QSBS Status, and How Do You Plan Around It?
- Related Topics Worth Reading
- Frequently Asked Questions
- Disclosures
Key Takeaways
- QSBS held for more than 5 years can qualify for a 100% federal capital gain exclusion up to the greater of $10 million or 10x basis per issuer.
- For stock issued after July 4, 2025, OBBBA raises the per-issuer cap to $15 million and adds 50% and 75% partial exclusions at 3 and 4 years.
- The issuing company must be a C-corporation with $50M or less in gross assets ($75M for stock issued after July 4, 2025) and use 80%+ of assets in an active qualified trade.
- Service businesses (financial services, consulting, health, law) are statutorily excluded, so QSBS rarely applies outside of operating companies in tech, manufacturing, or product-based industries.
About the Author: Jeff Judge, CFP®, AEP®, ChFC®, CLU® is Managing Partner of Chesapeake Financial Planners in Forest Hill, Maryland. He has been helping families and business owners in Harford County and the Baltimore metro area navigate equity compensation, business sales, and large liquidity events since earning his CFP® certification in 2013, by using Chesapeake Financial Planners’ signature process, the R.U.D.D.E.R. method™. Jeff sees QSBS most often when founders are blindsided by the holding period three weeks before a sale they didn't see coming.
What Is Qualified Small Business Stock (QSBS), and How Does Section 1202 Work?
Qualified small business stock is C-corporation stock that meets all of the size, business-activity, and issuance requirements set in Section 1202 of the Internal Revenue Code. When a shareholder holds eligible QSBS for more than 5 years and then sells, a portion of the gain is excluded from federal income tax. There is no separate election to file. Just a "Q" code on Form 8949 and a negative gain figure in column (g).
Section 1202 has been in the code since 1993, but most founders never look at it until they're already inside an acquisition. By that point, the holding period either qualifies them or it doesn't. The provision was a niche benefit for years, with a 50% exclusion that triggered alternative minimum tax adjustments that wiped out most of the savings. Two changes flipped it into one of the most generous tax breaks available to private-company shareholders. In 2010, the exclusion percentage rose to 100% for QSBS acquired after September 27, 2010. And in 2025, the OBBBA expanded the size of the company that can issue QSBS, raised the per-investor cap, and let shareholders capture partial exclusions before 5 years.
This post walks through who qualifies, how much can be excluded, what changed under OBBBA, and where founders most often lose QSBS status by accident. The R.U.D.D.E.R. Method™ is Chesapeake Financial Planners' six-step planning process: Review and Recognize, Uncover and Understand, Design and Develop, Discuss and Decide, Execute and Empower, and Reassess and Refine. For a QSBS-eligible founder, every one of those steps matters years before there's a buyer at the table.
Which Companies and Shareholders Qualify for QSBS?
Five tests have to be true at the same time. Miss any one and the stock isn't QSBS, no matter how long it's held.
The company must be a domestic C-corporation. S-corp stock, LLC interests, and partnership units don't qualify. A company that started as an LLC and later converted to a C-corp can still issue QSBS, but only the shares issued after the conversion are eligible. The holding period and qualification clock start over at the conversion date.
The stock must be originally issued to the shareholder. Per IRS Publication 550, the shareholder must have acquired the stock at its original issue, directly or through an underwriter, in exchange for money, property other than stock, or services to the corporation. Stock bought from another shareholder on the secondary market generally doesn't qualify, with limited exceptions for gifts and inheritances that carry the original holder's qualified status forward.
The company must pass the gross-assets test. Under legacy rules, the issuer's total gross assets must have been $50 million or less at all times after August 9, 1993, and immediately after the stock was issued. For QSBS issued after July 4, 2025, the OBBBA raised this ceiling to $75 million. Once the company crosses that ceiling, future stock issuances no longer qualify, but stock that was QSBS at the time of issuance keeps its status.
At least 80% of the company's assets must be used in an active qualified trade or business. This is a use test, not just an asset test. A C-corp sitting on a large pile of investment cash from a recent funding round can fail the 80% rule even if its operations are otherwise eligible.
The trade or business itself must be "qualified." Several major industries are excluded by statute, including any business performing services in health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, or brokerage services; any business whose principal asset is the reputation or skill of one or more employees; banking, insurance, financing, leasing, investing, or similar businesses; farming; businesses claiming percentage depletion; and operating hotels, motels, restaurants, or similar businesses. The result: most professional-services firms, financial firms, and asset-heavy real-estate businesses can't issue QSBS. Tech, life sciences, manufacturing, and most operating product businesses generally can.
How Much Can Founders Actually Exclude from Tax Under QSBS?
The per-issuer cap is the larger of two numbers: a flat dollar cap, or 10 times the shareholder's adjusted basis in the stock. Under legacy rules that still apply to QSBS issued on or before July 4, 2025, the dollar cap is $10 million per investor per company ($5 million for married filing separately). For QSBS issued after July 4, 2025, the OBBBA raises that dollar cap to $15 million.
The 10x basis alternative matters most for founders who invest significant capital. A founder who put $5 million of cash and property into a C-corp at the time of original issuance has a basis of $5 million in that stock. Ten times basis is $50 million. That's the cap, not $10 million. The flat dollar amount is the binding constraint when the founder's basis is small relative to the eventual sale price, which is the more common founder scenario.
The exclusion percentage depends on when the stock was acquired. Per the IRS Schedule D (Form 1040) instructions:
| QSBS acquisition date | Federal exclusion of qualified gain |
|---|---|
| On or before February 17, 2009 | 50% |
| February 18, 2009 through September 27, 2010 | 75% |
| After September 27, 2010 | 100% |
| After July 4, 2025 (held 3 years) | 50% (OBBBA) |
| After July 4, 2025 (held 4 years) | 75% (OBBBA) |
| After July 4, 2025 (held 5+ years) | 100% (OBBBA) |
For QSBS acquired after September 27, 2010 and held more than 5 years, the federal exclusion is 100% up to the cap. The 100% exclusion also avoids the alternative minimum tax adjustment that complicated the 50% and 75% tiers. Practically speaking, the qualified portion of the gain is excluded from federal income tax in full, with no AMT clawback.
State conformity is a separate question. Most states follow federal treatment for QSBS, but a handful (California, Pennsylvania, New Jersey, Alabama, and Mississippi) do not conform or only partially conform. State tax planning has to be layered on top of the federal exclusion, not assumed.
The holding-period clock is the one variable founders almost always misunderstand. The clock starts on the date the stock is issued, not the date the company was formed and not the date the founder began working there. For a founder who incorporated as an LLC and converted to a C-corp before raising priced capital, the QSBS holding period for the converted stock begins at the conversion. As Jeff often puts it: "The QSBS clock starts the day your stock is issued. By the time you're in a data room with a buyer, you can't change the holding period. You can only change the structure of the deal."
What Did the OBBBA Change About QSBS for Stock Issued After July 4, 2025?
The OBBBA, signed into law on July 4, 2025, made three structural changes to Section 1202 that apply to QSBS issued after that date. Stock issued on or before July 4, 2025 stays under the legacy framework.
The per-investor exclusion cap rose from $10 million to $15 million. The 10x basis alternative remains intact, so a founder with a $5 million basis still gets up to $50 million of excluded gain. The increase mostly matters for founders or early employees with small starting basis whose exit value is concentrated in equity appreciation, where the flat dollar cap is the binding constraint.
The gross-assets ceiling rose from $50 million to $75 million. This expands the pool of companies that can issue QSBS in the first place. A startup that raised a Series B round pushing gross assets to $60 million on its balance sheet would have failed the legacy size test the moment that cash hit the books. Under the new $75 million ceiling, that company can still issue QSBS through a larger fundraise.
A tiered holding-period schedule replaces the old 5-year cliff. For QSBS issued after July 4, 2025, the OBBBA introduces partial exclusions at shorter holding periods: 50% at three years, 75% at four years, and 100% at five years or more. Under legacy rules, anything sold before 5 years got zero Section 1202 exclusion. That cliff caused real damage for founders forced into an early acquisition. The tiered structure softens the cliff into a slope, so a founder forced to sell at 3.5 years still keeps half the qualified gain.
What didn't change: the eligible-issuer rules, the qualified-trade restrictions, the original-issuance requirement, and the active-business test all carry forward unchanged. The OBBBA expanded who can use Section 1202 and how much they can exclude, not the structural rules for qualifying in the first place.
For founders who own QSBS issued under both regimes (some legacy stock from a 2022 grant, plus new stock from a 2026 secondary issuance), each tranche is tested separately against the rules that applied when it was issued. Mixing the two takes careful basis tracking.
Where Do Founders Most Often Lose QSBS Status, and How Do You Plan Around It?
Section 1202 is unusually fragile. The status can be intact for years and then disappear because of a routine corporate action nobody flagged. A few of the most common loss points show up repeatedly in client work.
Stock buybacks within the wrong window. If the issuing corporation buys back more than a de minimis amount of its stock from the shareholder (or a related party) in a window starting two years before issuance and ending two years after, that issuance fails to be QSBS. A broader buyback rule applies to stock purchased from anyone in the year before or after issuance, with a 5% safe harbor. Companies that do recurring tender offers or secondary buybacks have to manage these windows carefully across each issuance cohort.
Failing the 80% active business use test. A C-corp that raises a large round and parks the proceeds in marketable securities or money-market instruments can fail the 80% active business use test while the cash sits idle. The cure is to deploy the capital fast enough that working capital and reserve assets stay within the safe-harbor exception. Founders rarely get a heads-up from the company when this risk is rising. It usually surfaces in a due diligence review, by which time the qualification gap may have already opened.
Converting from a C-corp to a partnership. A conversion from C-corp to LLC or partnership terminates QSBS status for any stock held at the time. Tax counsel should flag this in any entity-restructuring conversation before it happens. The holding period and any partial Section 1202 benefit accrued to that point are gone.
Selling to a related buyer or in a Section 368 reorganization. Section 1202 only applies to a "sale or exchange" of QSBS. Certain non-recognition reorganizations preserve qualification, but the technical requirements (continuity of interest, business purpose, and structural mechanics) trip up plenty of deals. A founder selling stock to a family member, a related entity, or back to the issuing corporation may inadvertently disqualify the gain.
Missing the Section 1045 rollover window when QSBS is sold early. If QSBS is sold before 5 years, a shareholder can elect to roll the gain into replacement QSBS purchased within 60 days. The replacement company has to clear the same eligibility requirements, and the 60-day clock is rigid. This is the planning lever for founders who get acquired at year 3 or 4 and want to preserve future Section 1202 status, especially if they're rolling proceeds into a new venture.
Jeff has watched founders miss the 60-day rollover window because the proceeds were tied up in escrow or earnout, and by the time the cash was free, the deadline had already closed. A pre-sale planning conversation about the rollover option (and the trust-stacking strategies founders sometimes use to spread the per-issuer cap across non-grantor trusts) needs to happen well before a letter of intent is signed.
Related Topics Worth Reading
QSBS interacts with several adjacent planning topics. A few that come up in nearly every founder conversation:
- How do I diversify a concentrated company stock position without a huge tax bill?. Even after the Section 1202 exclusion, founders often end up with a large single-stock position in the acquirer's shares. Diversifying out of that position has its own tax dynamics.
- How should I invest the proceeds after selling my business?. Once the exit is complete and the QSBS exclusion is locked in, the next question becomes what to do with the proceeds. Asset allocation, tax-aware investing, and trust planning all reset.
- When does exercising incentive stock options trigger the AMT?. Many founders received both QSBS and incentive stock options. The AMT treatment of ISO exercises is a separate planning problem that often runs in parallel with QSBS planning.
- What does a buy-sell agreement need to cover for a co-owned business?. For co-founders, what happens to QSBS in the event of death or disability is a structural question that should be addressed in the shareholder agreement, not improvised after the fact.
- What is step-up in basis, and how are inherited assets taxed?. QSBS that's held until death may receive a step-up in basis, which interacts with the Section 1202 exclusion in ways that can either compound or duplicate the tax benefit depending on the estate structure.
- How can a CFP financial planner help with business exit planning?. The QSBS calculation is one piece of a larger exit-planning conversation that touches estate planning, charitable giving, and post-sale investment strategy.
Frequently Asked Questions
Can S-corp stock qualify for QSBS?
No, S-corp stock cannot qualify for QSBS because Section 1202 is restricted to domestic C-corporations. S-corp stock, LLC interests, and partnership units don't qualify, regardless of company size or business activity. A company that started as an LLC or S-corp and later converted to a C-corp can issue QSBS after the conversion, but only the shares issued post-conversion are eligible. The 5-year holding period for those shares begins on the conversion date, not on the original LLC or S-corp formation date.
What happens if the company exceeds the $75 million gross asset threshold after my QSBS is issued?
Stock that was QSBS at the time of issuance keeps its qualified status even if the company later grows past the size test. The gross asset test is applied at the time of issuance, not at the time of sale. Per IRS Publication 550, the company must have had $50 million or less ($75 million for stock issued after July 4, 2025) in gross assets at all times before issuance and immediately after. Future issuances cease to qualify, but existing QSBS shares are preserved.
Does the QSBS holding period start over if I convert from an LLC to a C-corp?
Yes, in most cases the QSBS holding period restarts at conversion from an LLC to a C-corp because the original LLC interests aren't QSBS. The holding period for any C-corp stock issued at conversion begins on the conversion date. Founders who anticipate raising priced equity often convert to a C-corp earlier than strictly necessary precisely to get the QSBS clock ticking. Section 351 contributions of property in exchange for stock generally preserve QSBS-eligible basis at fair market value, with technical nuances that benefit from tax-counsel review before the conversion is finalized.
Can I claim QSBS on stock I bought on the secondary market?
Generally no, you cannot claim QSBS on stock purchased on the secondary market because Section 1202 requires the stock to have been acquired at original issuance. The shareholder must have acquired the stock directly or through an underwriter, in exchange for money, property other than stock, or services. Stock bought from another shareholder fails this requirement. Limited exceptions exist for stock received by gift or inheritance, where the recipient steps into the original holder's QSBS status and holding period.
How does the QSBS exclusion interact with the Net Investment Income Tax (NIIT)?
Gain that is excluded from gross income under Section 1202 is also excluded from net investment income, so the 3.8% NIIT does not apply to the excluded portion. Only any non-excluded gain (the portion above the per-issuer cap) can be subject to NIIT. For QSBS acquired after September 27, 2010 and held more than 5 years, the qualifying gain is excluded from federal income tax and NIIT in full, up to the dollar or 10x basis cap.
What is the alternative minimum tax (AMT) impact on QSBS today?
For QSBS acquired after September 27, 2010 and held more than 5 years, the 100% exclusion is not subject to an AMT preference adjustment. The full excluded gain is also excluded for AMT purposes. For older QSBS still falling under the 50% or 75% exclusion tiers, a portion of the excluded gain is added back as an AMT preference item, which can erode the benefit substantially for shareholders in AMT territory. Per the IRS Schedule D instructions, shareholders qualifying for 50%, 60%, or 75% exclusion enter 7% of the allowable exclusion on Form 6251 line 13; the 100% exclusion requires no Form 6251 entry.
The QSBS exclusion is one of the most generous federal capital gains breaks in the code, but it has to be planned for years before a transaction, not after. If you'd like a deeper look at how QSBS fits with the rest of an exit plan, our guide to equity compensation and tax-aware exits covers the related strategies (ISO exercises, NUA, deferred compensation, charitable trusts, and the AMT trap) in depth. Download it at chesapeakefp.com.
Want to go deeper? Our 10 Signs You're Ready for a Certified Financial Planner walks through this step by step.
Disclosures
The information provided is for educational purposes only and should not be construed as investment advice. Investment strategies should be tailored to individual circumstances, risk tolerance, and goals. Past performance doesn't guarantee future results. Consult with qualified financial professionals regarding your specific situation.
This information is not intended to be a substitute for specific individualized tax, investment or legal advice. We suggest that you discuss your specific situation with a qualified tax, legal or financial advisor.
Advisors associated with Chesapeake Financial Planners may be either (1) LPL Financial Registered Representatives offering securities through LPL Financial, Member FINRA and SIPC, and investment advisor representatives offering investment advice through Great Valley Advisor Group; or (2) solely investment advisor representatives offering investment advice through Great Valley Advisor Group and not affiliated with LPL Financial. Great Valley Advisor Group, and Chesapeake Financial Planners are separate entities from LPL Financial.
