How Does the Qualified Small Business Stock Exclusion Work?
Last reviewed: July 2026
The QSBS exclusion lets you exclude up to 100% of the capital gains from selling qualified small business stock from federal income tax, under Section 1202 of the tax code. To qualify, you generally need to hold original-issuance C-corporation stock for a set holding period, and the company must meet a gross-asset and active-business test when the stock is issued. For founders and early startup employees, that can mean millions in gains that never get taxed at the federal level.
Key Takeaways
- The QSBS exclusion can wipe out 100% of federal capital gains tax on qualifying stock held long enough under Section 1202.
- Stock acquired on or before July 4, 2025 caps the exclusion at the greater of $10 million or 10x your basis.
- Stock acquired after July 4, 2025 raises the cap to $15 million and the asset limit to $75 million.
- QSBS only applies to original-issuance C-corporation stock, never shares bought from another shareholder.
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 and exit taxation since earning his CFP® certification in 2013, by using Chesapeake Financial Planners’ signature process, the R.U.D.D.E.R. method™. Jeff has watched startup employees lose six-figure tax savings simply because nobody told them the holding-period clock started at exercise, not at the sale.
What Is the QSBS Exclusion Under Section 1202?
The QSBS exclusion is a federal tax break that allows shareholders to exclude capital gains from the sale of qualified small business stock. It lives in Section 1202 of the Internal Revenue Code. If your stock qualifies and you hold it long enough, your federal capital gains tax on the sale can drop to zero.
The dollar cap depends on when you acquired the stock. For stock acquired on or before July 4, 2025, you can exclude the greater of $10 million in gain or 10 times your adjusted basis in the stock. The One Big Beautiful Bill Act, signed in July 2025, rewrote the rules for stock acquired after July 4, 2025: the per-issuer cap rose to $15 million (indexed for inflation starting in 2027), and partial exclusions kick in earlier.
Here's a quick comparison of the two regimes.
| Feature | Acquired on/before July 4, 2025 | Acquired after July 4, 2025 |
|---|---|---|
| Holding period for 100% | 5 years | 5 years |
| Partial exclusion before 5 years | None | 50% at 3 years, 75% at 4 years |
| Per-issuer gain cap | Greater of $10M or 10x basis | Greater of $15M or 10x basis |
| Company gross-asset limit | $50 million | $75 million |
So if you invested $100,000 in qualifying startup stock and it grew to $3 million, your gain is $2.9 million. Under the QSBS exclusion, that entire gain can be federally tax-free, compared with roughly $689,000 in tax at a 20% capital gains rate plus the 3.8% net investment income tax. That is one of the most powerful capital gains exclusion provisions in the entire code.
What Are the QSBS Requirements You Have to Meet?
Section 1202 is unforgiving. Miss a single requirement and the whole exclusion disappears. These are the core tests for qualified small business stock.
The company must be a C-corporation. Only C-corp stock qualifies. LLCs, S-corps, and partnerships do not. Many startups begin life as an LLC or S-corp for simplicity, and if the company never converts to C-corp status before issuing your shares, QSBS never applies, no matter how long you hold.
The stock must be original issuance. You have to acquire the shares directly from the company, at grant, at exercise, or as compensation. Buying shares from another employee or investor in a secondary sale disqualifies them. So do shares received in a merger or acquisition. This is where stock option taxes get complicated, because exercising options from the company counts, but a secondary purchase of the same company's shares does not.
The company must be a qualified small business at issuance. When you received the stock, the company's gross assets had to be under the asset cap (under $50 million for pre-July 5, 2025 stock; under $75 million after). Employees who join after a large Series C or D round often blow past this limit without knowing it. If the company already held $100 million in assets when your shares were issued, they do not qualify.
The active business test. At least 80% of the company's assets must be used in an active qualified trade or business. Most tech, biotech, manufacturing, and software companies pass. Several industries are excluded: banking and finance, insurance, farming, hospitality, professional services like law and accounting, real estate, and oil and gas extraction.
The holding period. For the full 100% exclusion, you must hold qualifying stock for at least five years from the acquisition date, not the grant date. Jeff Judge often reminds clients that the clock starts when you actually own the shares, which is usually the exercise date for options. For stock acquired after July 4, 2025, you can claim a 50% exclusion at three years and 75% at four years, but the full benefit still waits at year five.
How Do Stock Options and the QSBS Holding Period Interact?
The interaction between your stock options and the QSBS holding period is where most startup employees lose money. The five-year clock starts when you exercise and own the shares, so the longer you wait to exercise, the longer you wait to start qualifying.
Early exercise can start the QSBS clock sooner, but it also triggers a tax event. Exercising incentive stock options can create alternative minimum tax (AMT) exposure on the spread between your strike price and the fair market value, even though you have not sold anything. That AMT bill is a real cost that has to be weighed against the future QSBS benefit. According to the IRS, the AMT adjustment from ISO exercise is one of the most common AMT triggers for employees at growing companies. Jeff Judge notes: "Paying AMT today on an early ISO exercise can absolutely be the right call if it starts your five-year QSBS clock running, but you have to model both sides of that trade before you write the check, not after."
This is exactly the kind of decision the R.U.D.D.E.R. Method™ is built for. 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. Modeling an early exercise against a QSBS payoff five years out is precisely the Design and Develop work that keeps a six-figure tax break from slipping away.
How Should Business Owners Pay Themselves Salary vs Distributions?
How Much Can You Actually Save With QSBS?
The savings depend on your gain, your basis, and which regime applies to your stock. The exclusion caps at the greater of $10 million (or $15 million for post-July 4, 2025 stock) or 10 times your adjusted basis in the shares.
That 10x-basis rule is the underappreciated lever. If you invested $2 million in founder stock, your cap is $20 million, well above the flat dollar limit. Most early employees with small bases rely on the flat cap, while founders and angel investors with larger bases often get more room through the 10x calculation. Either way, the federal long-term capital gains rate of 20% plus the 3.8% net investment income tax is what you are avoiding on excluded gains.
How do I invest the proceeds from selling my business?
How Can Business Owners Use Profit-Sharing Plans for Tax Benefits?
Frequently Asked Questions
Does QSBS eliminate state taxes too?
No, the QSBS exclusion applies to federal capital gains tax only. State treatment varies widely. Some states follow the federal exclusion, others partially conform, and a few, including California, do not recognize QSBS at all. Where you live when you sell can significantly change your actual tax bill, so confirm your state's rules before counting on full savings.
When does the five-year QSBS holding period start?
The five-year holding period starts on the date you actually acquire the qualifying stock, not the date your options were granted. For most employees that is the exercise date, when you pay the strike price and own real shares. Founders typically start the clock at incorporation. Getting this date right is critical, because selling even one day early can disqualify the entire exclusion.
Can I qualify for QSBS if my company started as an LLC?
You can qualify only if the company converted to a C-corporation before issuing your stock, and the conversion itself does not reset most other requirements favorably. Stock issued while the business was an LLC, S-corp, or partnership never qualifies as QSBS. Your holding period and gross-asset test are measured from the C-corp issuance, so the conversion timing matters a great deal.
What happens if I sell before holding for five years?
If you sell qualifying stock before five years, you generally lose the full exclusion, though stock acquired after July 4, 2025 allows a 50% exclusion at three years and 75% at four years. For older stock, there is no partial credit. One option is a Section 1045 rollover, which lets you defer gain by reinvesting proceeds into new QSBS within 60 days while preserving your original holding period.
Do RSUs qualify for the QSBS exclusion?
Restricted stock units can qualify, but only once they vest and convert into actual shares issued directly by a C-corporation that meets the gross-asset and active-business tests at issuance. The holding period starts at vesting, when you receive the shares. RSUs at a large, late-stage company often fail the gross-asset test because the business already exceeded the asset cap.
Putting QSBS to Work Before It's Too Late
The biggest QSBS mistakes happen years before the sale, usually when nobody runs the numbers on exercising early or confirms the company actually met the gross-asset test at issuance. If you hold startup equity and want to understand whether your shares qualify for the QSBS exclusion, our guide to equity compensation and exit planning walks through the decisions in plain English. Download it at chesapeakefp.com and start mapping your strategy while the holding-period clock still works in your favor.
Want to go deeper? Our Tech Equity Tax Traps Guide 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.
