What is qualified small business stock (QSBS)? Rules, eligibility & tax benefits

What is qualified small business stock (QSBS)?

corporation that you acquire directly from the company, and that meets the requirements of IRC Section 1202. If both the company and the shareholder qualify, you can exclude some or all of the federal capital gains tax on your profit when you sell. Done right, that can mean $0 in federal tax on millions of dollars of gain.

Founders receive it as founder stock. Employees get it when they exercise their options. Early investors pick it up in a funding round. Congress created the benefit to encourage long-term investment in active U.S. businesses, and for those who qualify, the savings are significant.

The benefit does not apply automatically, and it does not manage itself. Your acquisition date, the company's structure, and how long you hold the stock all determine what you actually keep. This guide explains how.

What is IRC section 1202 and the QSBS exclusion?

IRC Section 1202 is the federal statute behind the QSBS tax exemption. The exclusion percentage available to shareholders has changed over time based on when the stock was acquired.

The exclusion percentage Congress has offered has increased over time:

The most significant recent change came with the one big beautiful bill act (OBBBA), enacted July 4, 2025. For stock issued after that date, OBBBA raised the per-issuer cap from $10 million to $15 million, lifted the gross-asset ceiling from $50 million to $75 million, and replaced the single five-year threshold with a tiered holding-period schedule. Stock issued on or before July 4, 2025 is unaffected, those shares stay under the prior rules.

The four QSBS eligibility requirements

QSBS qualification comes down to four things. And all four have to be true at the same time. Miss one and the exclusion can disappear.

1. The company must be a U.S. C-corporation

The issuing company must be a U.S. C-corporation, not an LLC, S-corp, or REIT, and must stay one for most of the time you hold the stock. The company's total assets also have to come in under a size ceiling at the time your shares are issued: $50 million for stock issued on or before July 4, 2025, and $75 million for stock issued after that date.

2. At least 80% of company assets must be used in an active business

The company has to be running a real, active business, not sitting on passive cash or investments. This has to hold true for most of the time you own the stock, not just at issuance. Certain industries are excluded entirely: professional services, financial services, farming, and hospitality do not qualify regardless of size.

3. You must acquire the stock directly from the company

The stock has to come directly from the company, not purchased from another shareholder. It must be received in exchange for cash, property, or services. Shares bought on the secondary market never qualify, no matter how long you hold them.

One thing to watch: company stock buybacks within four years of your issuance date, or significant buybacks from any shareholder within one year before or after, can quietly disqualify your shares . This is worth reviewing with a tax advisor before any liquidity event.

4. You must hold the stock long enough

How long you hold determines how much gain you can exclude:

QSBS eligibility checklist

Run through these six questions before relying on the exclusion:

• Is the issuer a domestic C-corporation, and has it stayed one during your hold?

• Were the company's aggregate gross assets under the applicable ceiling ($50 million or $75 million) through and immediately after issuance?

• Is at least 80% of the company's assets used in an active, qualified trade or business?

• Is the company outside the excluded industries above?

• Did you acquire the stock directly from the company at original issuance?

• Have you held, or will you hold, the stock long enough for your target exclusion tier?

QSBS rules: old vs. new at a glance

The single most important QSBS question in 2026 is when the stock was acquired. Here is how the two regimes compare:

Which businesses do not qualify for QSBS?

Section 1202(e)(3) excludes several trades and businesses from QSBS eligibility. When your company's principal asset is the reputation or skill of its employees or owners, it is likely on the excluded list.

Excluded categories include:

• Health, law, accounting, consulting, and other professional services where skill or reputation is the main asset

• Financial services, banking, insurance, investment management, and brokerage services

• Farming, mining and natural resources extraction, and hospitality such as hotels and restaurants

Many technology, industrial, and product companies qualify, while service-heavy professional firms typically do not.

Should you wait to sell to reach a higher exclusion tier?

Under the new tiered rules, the timing decision is real. Selling post-2025 stock at three years locks in a 50% exclusion, while waiting to four or five years moves you to 75% or 100%. Across the tiers, your effective federal rate on the gain can move from roughly 15.9% at three years to 0% at five, so the difference on a large gain is substantial.

The trade-off is straightforward to frame, even if the decision is not. Holding longer raises your exclusion percentage but exposes you to more market and company risk. Whether the extra exclusion is worth the wait depends on your gain size, the applicable cap, and your view on the company. That is a conversation for your tax advisor with numbers on the table.

QSBS tax treatment and capital gains exclusion

When gain qualifies under QSBS, it is excluded from your federal gross income entirely, no federal income tax and no net investment income tax (NIIT) on that portion. Any gain above the cap remains taxable at normal rates.

1. How much can you exclude?

The exclusion is capped per company at the greater of:

• $10 million (pre-July 4, 2025 stock) or $15 million (post-July 4, 2025 stock)
• 10x your adjusted basis in that company's stock

The 10x rule matters most for investors who put significant capital in. A $5 million investment gives a $50 million exclusion cap, far above either flat dollar limit. For founders with near-zero basis, the flat cap almost always applies.

2. When do you pay 0% federal tax?

Three things need to line up:

1. Your stock qualifies as QSBS
2. You have held it long enough for a 100% exclusion
3. Your gain falls within the per-issuer cap

For stock acquired after September 27, 2010, the excluded gain is also not subject to the Alternative Minimum Tax (AMT), meaning no income tax, no NIIT, and no AMT on the excluded portion.

3. Two examples in dollars

• Old rules: founder, 100% exclusion: Stock acquired in 2016 with $100K basis, sold in 2022 for $10.1 million. Full $10 million gain excluded. Federal tax avoided: roughly $2.38 million.
• New rules: angel investor, 3-year hold, 50% exclusion: Stock acquired August 2025 with $2 million basis, sold September 2028 for $12 million. Half the gain excluded. Federal tax owed: roughly $1.59 million, an effective rate of about 15.9%.

4. How to estimate your savings

Four inputs you need:

1. When you acquired the stock, set your rule regime
2. How long you have held it, set your exclusion tier
3. Your sale proceeds
4. Your basis

5. How QSBS is calculated?

Common QSBS pitfalls to avoid

Common triggers are:

• Company conversion: If the company converts out of C-corp status during your holding period, QSBS eligibility is at risk

• Asset ceiling breach: If gross assets exceed the ceiling before or at issuance, the stock is not QSBS at inception. This cannot be corrected after the fact

• Industry drift: A company that starts in a qualified industry and later pivots heavily into an excluded one can fail the active-business test. Under Section 1202, the active-business requirement applies for substantially all of your holding period, not just at issuance. A pivot years later can retroactively put the exclusion at risk

• Redemptions: Two separate tests apply. Personal buybacks within a four-year window around your issuance, and significant company-wide buybacks within a two-year window, can each disqualify your shares independently
• Secondary market purchases: Shares acquired from another shareholder never qualify as QSBS regardless of how long they are held

• Broken paper trail: Even when a company technically complied with Section 1202 at every step, incomplete cap table and asset records make QSBS difficult to prove on audit. This is the most common real-world problem

Does the QSBS exclusion apply to state taxes?

QSBS is a federal benefit. State treatment varies significantly and does not follow automatically.

As of 2026, states that do not conform include California, Alabama, Mississippi, Pennsylvania, and Washington D.C. New Jersey was non-conforming but began conforming from January 1, 2026. Hawaii and Massachusetts partially conform.

For California founders specifically, a $10 million federally excluded gain still carries a state tax bill of over $1.3 million at the 13.3% rate. Residency and timing are worth planning well before a liquidity event.

What is a section 1045 rollover?

If you sell QSBS before hitting your exclusion threshold, a Section 1045 rollover lets you defer the capital gains tax by reinvesting the proceeds into new QSBS within 60 days. Your holding period carries over, so you do not start from zero.

• You must have held the original stock for more than six months

• Proceeds must go into a different qualifying company, not the same one

• The 60-day window is hard, no extensions

What QSBS documents do you need before a liquidity event?

Before you sign an acquisition or close an IPO, assemble a QSBS evidence package. Have your counsel and tax advisor confirm each item well ahead of the closing.

• Articles of incorporation and amendments showing C-corp status across the holding period
• Cap table history with issuance dates and evidence of original issuance for each lot
• Financial statements and 409A valuations showing gross assets under the applicable ceiling at issuance, plus documentation supporting active-business use

Conclusion

QSBS is one of the most valuable tax benefits available to founders, early employees, and investors, but it does not manage itself. The exclusion is earned at issuance, maintained over years, and proved at exit. Each of those three moments requires something from you: the right company structure, continuous eligibility, and documentation that holds up under scrutiny.

The rules are not complicated once you know them. Your acquisition date, your holding period, your issuance records, these are not exit tasks. They are day-one tasks that compound quietly in your favour, or against you, depending on whether anyone was paying attention.

Get the structure right, keep the records current, and confirm everything with a tax advisor before you sell. That is the full playbook.

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FAQs

1. What does QSBS mean?

QSBS stands for qualified small business stock. It refers to stock in a U.S. C-corporation that meets the requirements of IRC Section 1202, allowing eligible shareholders to exclude some or all of their federal capital gains tax when they sell.

2. What is 1202 stock?

1202 stock is another name for QSBS. It refers to stock that qualifies for the capital gains exclusion under Section 1202 of the Internal Revenue Code. The terms QSBS, 1202 stock, and qualified small business stock are used interchangeably.

3. How does QSBS fit into tax planning for small business owners?

QSBS is one of the most powerful tax planning tools available to founders and early investors. Structuring as a C-corporation from the start, issuing stock at original issuance, and tracking holding periods from day one are all decisions that compound over time. For business owners planning an eventual exit, QSBS can be the difference between paying 20%+ in federal capital gains tax and paying nothing at all.

4. What is the connection between QSBS and IRC 1202?

IRC Section 1202 is the federal statute that creates the QSBS tax exemption. QSBS is simply the stock that meets Section 1202's requirements. Without Section 1202, there is no exclusion, the two are inseparable.

5. Can employees qualify for QSBS?

Yes. Employees who exercise options into shares of a qualifying C-corp can hold QSBS, and the holding period starts at exercise. The shares must meet the same company, issuance, and holding-period tests as any other QSBS.

6. What is the 5-year rule for QSBS?

You must generally hold QSBS for more than five years to claim the full exclusion. This still applies to stock acquired on or before July 4, 2025. Later stock uses a tiered schedule that gives partial benefits at three years.

7. What happens to QSBS if my company is acquired before five years?

In some cases eligibility can be preserved through a tax-free share exchange, for example if the acquiring company's stock qualifies as QSBS and the transaction is structured as a tax-free reorganisation. Outcomes vary significantly depending on deal structure. A tax advisor needs to review the specific transaction before closing.