QSBS Explained: How Founders Can Exclude Millions in Gains

QSBS stands for Qualified Small Business Stock. It refers to stock that meets specific requirements under Section 1202 of the Internal Revenue Code and may qualify the shareholder for a significant federal tax exclusion when the stock is sold.

In simple terms, QSBS can allow an eligible founder or investor to exclude some or potentially all of the gain from the sale of qualifying stock—potentially saving millions of dollars in federal income tax.

For example, a founder may invest $100,000 in a qualifying C-corporation and eventually sell the stock for $10 million. If the stock satisfies all applicable QSBS requirements, a substantial portion of the resulting gain may potentially be excluded from federal income tax.

For stock issued after July 4, 2025, the rules became more favorable in several respects, including a phased exclusion for qualifying stock held for three, four, or five years. The applicable exclusion and limitations depend on when the stock was issued and the taxpayer’s specific circumstances.

But QSBS is not automatic. The corporation, the stock issuance, the shareholder, the business activities, the holding period, and other factors must satisfy specific requirements.

For founders building a company with the potential for a significant future exit, this makes QSBS more than a tax provision to consider at the time of sale. It is a planning opportunity that may need to be addressed years before an acquisition takes place.

What Is QSBS?

QSBS stands for Qualified Small Business Stock. The tax benefit is found in Internal Revenue Code Section 1202.

In general, Section 1202 can allow eligible non-corporate taxpayers to exclude some or all of the gain from the sale of qualifying stock.

The potential benefit is substantial. For qualifying stock issued after July 4, 2025, the exclusion can potentially cover:

• 50% of eligible gain after a three-year holding period
• 75% after a four-year holding period
• 100% after a five-year holding period

subject to the applicable limitations.

For qualifying stock acquired under the older rules, the traditional five-year holding requirement generally remains relevant, and the older $10 million limitation applies.

This distinction is extremely important for founders who acquired stock before and after the July 4, 2025 changes.

Why QSBS Can Be So Valuable

Consider a simplified example.

A founder acquires qualifying stock for $100,000 Several years later, the founder sells the shares for $10,000,000 The approximate gain is $9,900,000

If all Section 1202 requirements are satisfied and the stock qualifies for a 100% exclusion, the founder may potentially exclude the entire $9.9 million gain from federal gross income.

That is dramatically different from simply selling ordinary investment stock and paying tax on the entire gain.

The potential federal tax savings can be substantial. But this is exactly why QSBS qualification needs to be established before the exit, rather than assumed after the sale.

The 2025 QSBS Changes Matter for Founders

The rules changed under legislation enacted July 4, 2025.

For stock issued after that date, three major changes are particularly important.

1. The gross-asset threshold increased

The qualified small business generally must have aggregate gross assets of no more than $75 million at the relevant issuance points.

For stock issued on or before July 4, 2025, the threshold was generally $50 million.

2. The potential dollar exclusion increased

For qualifying stock issued after July 4, 2025, the dollar limitation increased to $15 million, subject to the alternative 10-times-basis limitation.

For older qualifying stock, the dollar limitation generally remains $10 million.

3. The holding-period benefit was expanded

For qualifying stock issued after July 4, 2025:

• Three years → potentially 50% exclusion
• Four years → potentially 75% exclusion
• Five years → potentially 100% exclusion

This makes early-stage tax planning even more important.

The Company Generally Needs to Be a C-Corporation

One of the most important QSBS requirements is the type of corporation issuing the stock. The stock generally must be issued by a domestic C-corporation. This means founders should not assume that simply forming an LLC or S-corporation preserves QSBS eligibility. The entity’s tax classification matters.

For example, suppose a founder starts a business as an LLC and later decides to seek venture capital. The founder may eventually convert or reorganize the business into a C corporation. The timing and structure of that conversion can become important for Section 1202 purposes.

This is why QSBS should be considered during entity planning—not only when a buyer appears.

The Company Must Meet the Gross-Asset Test

The company must satisfy the applicable gross-asset requirement when the stock is issued.

For stock issued after July 4, 2025, the threshold is generally $75 million. For stock issued on or before July 4, 2025, the threshold was generally $50 million. Importantly, this does not mean the company must remain below the threshold forever. A startup can grow substantially after issuing qualifying stock.

The critical issue is whether the requirements were satisfied at the relevant times.

Example: A Startup Grows After Issuing Stock

Imagine a founder forms a C-corporation in 2026. At the time qualifying shares are issued, the company’s gross assets are $5 million. The company subsequently raises capital and grows rapidly. Five years later, the business has $150 million of assets. The fact that the company later became much larger does not automatically mean the founder’s stock ceased to qualify.

The Section 1202 rules focus on specific requirements at specific points in time, along with continuing active-business requirements. This is one reason founders should preserve historical financial and corporate records.

The Stock Generally Must Be Acquired at Original Issuance

QSBS is not simply a tax break for buying shares of a small company.

Generally, the shareholder must acquire the stock at original issuance from the corporation, either directly or through an underwriter, in exchange for:

• Money
• Property other than stock
• Services

Certain transfers can receive special treatment, but purchasing shares from another shareholder generally does not automatically create new QSBS for the purchaser

Why Founders Should Document Their Stock Issuance

Imagine a founder says: “I started the company, so obviously my shares are QSBS.”

That may be true—or it may not be.

A proper QSBS analysis can require documentation showing:

• When the corporation was formed
• When the shares were issued
• Number of shares issued
• Purchase price
• Consideration paid
• Stock purchase agreements
• Capitalization records
• Corporate resolutions
• Historical financial statements
• Gross assets at issuance
• Business activities
• Subsequent stock issuances

The tax benefit can be worth millions.

That makes documentation extremely valuable.

The Active Business Requirement

QSBS is designed to encourage investment in operating businesses.

The corporation generally must use at least 80% of its assets by value in the active conduct of one or more qualified trades or businesses during substantially all of the shareholder’s holding period.

Certain assets, including reasonable amounts of working capital and assets used in startup activities and research and development, can receive favorable treatment under the rules.

This means a company cannot necessarily qualify simply because it is technically a C corporation with a small balance sheet.

Its actual activities matter.

Not Every Business Qualifies

This is an area founders frequently overlook.

Certain businesses are excluded from the definition of a qualified trade or business.

The excluded categories generally include businesses involving:

• Health
• Law
• Accounting
• Consulting
• Financial services
• Banking
• Insurance
• Financing
• Farming
• Certain natural-resource activities
• Hotels
• Motels
• Restaurants
• Businesses where the principal asset is the reputation or skill of one or more employees

This can be particularly important for professional service businesses.

A founder may build a highly profitable company and assume that “small business stock” means the shares automatically qualify. They do not. The nature of the business must be analyzed.

Example: A Technology Company vs. a Professional Service Firm

Imagine two companies.

Company A: Develops proprietary software and sells subscriptions to customers.

Company B: Provides consulting services based primarily on the expertise and reputation of its professionals.

Both companies may be profitable. Both may be C-corporations. But their eligibility for Section 1202 can be very different.

The specific business activities need to be analyzed rather than relying on the company’s industry label.

Holding Period: Planning Starts Early

For stock issued after July 4, 2025, the new rules provide a phased benefit.

After 3 years

Potentially 50% exclusion

After 4 years

Potentially 75% exclusion

After 5 years

Potentially 100% exclusion

This changes the way founders may think about exit planning.

Previously, selling before five years could mean losing the Section 1202 exclusion altogether.

Under the newer rules, qualifying stock issued after July 4, 2025 can potentially receive a partial benefit before the five-year mark.

But that does not mean selling early is automatically better.

A founder should consider the tax cost alongside the business and transaction economics.

Example: Selling After Four Years

Suppose a founder owns qualifying stock issued in 2026. Four years later, the founder sells the stock and realizes $8 million of eligible gain.

Assuming all other requirements are satisfied, the applicable exclusion percentage could be 75%. That would mean $6 million of gain potentially excluded. The remaining $2 million would remain subject to the applicable tax rules. A sale after five years could potentially qualify for a 100% exclusion instead. This makes the timing of a transaction an important tax-planning consideration.

The $15 Million Limit Is Not Always the Real Limit

The new rules provide a dollar limitation of generally $15 million for qualifying stock issued after July 4, 2025.

But Section 1202 also contains an alternative limitation based on 10 times the taxpayer’s adjusted basis in the qualifying stock.

The taxpayer generally can exclude the greater of the applicable dollar limitation or the 10-times-basis limitation, subject to the detailed statutory rules.

This can be especially important for founders who invested substantial capital into their businesses.

Example: The 10-Times-Basis Rule

Suppose a founder acquires qualifying stock for $2 million. The founder later sells the stock after satisfying the applicable requirements. Ten times the original adjusted basis could be $20 million. That may exceed the $15 million dollar limitation.

The alternative limitation therefore becomes important. This is one reason founders should not assume that “QSBS means $15 million maximum.” The calculation can be more nuanced.

Stock Basis Matters

The 10-times-basis limitation makes the founder’s investment history important.

Consider:

• Initial investment
• Additional stock issuances
• Additional capital contributions
• Recapitalizations
• Stock exchanges
• Transfers
• Redemptions

The basis calculation can become complicated.

A founder who expects a significant exit should maintain detailed records rather than trying to reconstruct basis immediately before the sale.

Don’t Assume Every Share Is Automatically QSBS

A founder may receive shares at different times and under different circumstances.

For example:

• Founder shares
• Shares issued during a seed round
• Shares issued during a Series A
• Stock options
• Restricted stock
• Shares received upon exercise
• Shares acquired through a secondary purchase

Each category can require separate analysis. The relevant acquisition date and manner of acquisition can affect the Section 1202 analysis.

Stock Options and Equity Compensation Require Planning

Founders and employees often receive equity through options or other compensation arrangements.

The date an option is granted is not necessarily the same thing as the date the underlying stock is acquired.

The tax treatment can depend on the type of equity compensation, when the stock is actually acquired, the exercise price, and other facts. This means a company should not simply tell employees: “Your options are QSBS.”

Instead, employees should receive appropriate tax advice concerning when and how their shares are acquired and whether the requirements are satisfied.

Secondary Sales Can Create Complications

Founders sometimes sell a portion of their shares before the company is acquired.

For example, a founder might sell $2 million of shares in a secondary transaction to obtain liquidity. That can be attractive from a personal financial-planning perspective. But the QSBS analysis should be performed before the transaction.

Selling shares early can:

• Trigger taxable gain
• Affect available exclusions
• Create holding-period considerations
• Require analysis of whether the shares qualify
• Change the amount of stock remaining for a future exit

Liquidity planning and QSBS planning should therefore be coordinated.

Section 1045 Can Also Matter

Founders and investors who sell qualifying small business stock before satisfying the full five-year holding period may want to consider whether Section 1045 provides a potential rollover opportunity.

Under certain circumstances, a taxpayer who has held QSBS for more than six months can reinvest proceeds into replacement QSBS within the required period and potentially defer some of the gain.

The rules are technical and the replacement stock must satisfy the applicable requirements. This is not simply an automatic “rollover” provision.

It is another reason to analyze a proposed stock sale before closing rather than after the transaction is completed. The IRS recognizes Section 1045 treatment for qualifying replacement-stock transactions under the applicable rules.

California Residents Need an Additional Layer of Planning

For founders in Los Angeles and throughout California, there is another important issue:

Federal QSBS treatment and California treatment are not necessarily the same.

A founder may qualify for a federal Section 1202 exclusion while still facing California income-tax consequences. This can materially affect the expected tax savings from an exit.

Therefore, a California founder should not calculate the potential benefit simply as: “My federal capital-gain tax will be zero.”

The state tax analysis needs to be performed separately. This is particularly important for founders planning to sell a highly appreciated business while remaining California residents.

Example: Why State Planning Matters

Suppose a California founder sells qualifying stock and expects a $10 million gain. The federal Section 1202 rules may potentially exclude all or a substantial portion of the qualifying gain. But California may not provide the same exclusion. The founder could therefore have:

Federal tax treatment ≠ California tax treatment

This difference can be worth millions of dollars.

For a major liquidity event, state residency and timing can become important planning considerations—but these decisions should be evaluated well in advance and based on the applicable law.

QSBS Planning Should Begin Before the Company Becomes Valuable

One of the biggest QSBS mistakes is waiting until the acquisition agreement is being negotiated.

At that point, many important decisions have already been made.

Ideally, founders should consider QSBS when:

• Choosing the initial entity
• Converting to a C corporation
• Issuing founder shares
• Raising outside capital
• Issuing employee equity
• Structuring financing
• Adding investors
• Planning secondary sales
• Preparing for a potential acquisition

The earlier the analysis begins, the more planning opportunities may be available.

Example: Two Founders, Two Outcomes

Imagine two founders start similar businesses.

Founder A

Forms a C corporation, carefully documents the original stock issuance, maintains historical records, monitors the gross-asset test, and periodically reviews the company’s business activities for Section 1202 purposes.

Five years later, the company is sold.

Founder B

Uses several different entity structures, transfers shares between entities, fails to maintain clear stock records, and only asks about QSBS after receiving an acquisition offer.

The businesses may be economically similar. But the quality of the tax records and planning can be dramatically different. That difference can become extremely valuable at exit.

QSBS Due-Diligence Checklist for Founders

Before assuming that stock qualifies, consider reviewing:

Company

• ☐ Is the issuer a domestic C corporation?
• ☐ Did the company satisfy the applicable gross-asset threshold when the stock was issued?
• ☐ Were the required active-business tests satisfied?
• ☐ Does the business fall within a prohibited category?
• ☐ Are historical financial records available?

Stock

• ☐ When was each block of stock issued?
• ☐ Was it acquired at original issuance?
• ☐ What was paid for the shares?
• ☐ What is the adjusted basis?
• ☐ Are there stock purchase agreements?
• ☐ Are capitalization records complete?
• ☐ Have there been redemptions or reorganizations?

Shareholder

• ☐ Is the shareholder an eligible non-corporate taxpayer?
• ☐ How long has the stock been held?
• ☐ Has any portion already been sold?
• ☐ Have there been transfers or gifts?
• ☐ Is the shareholder considering a secondary transaction?

Exit

• ☐ What type of transaction is contemplated?
• ☐ Stock sale or asset sale?
• ☐ When is the anticipated closing?
• ☐ Will the holding period requirement be satisfied?
• ☐ Does Section 1045 need to be considered?
• ☐ What are the federal and state consequences?

Stock Sale vs. Asset Sale Can Change the Analysis

QSBS is fundamentally a stock-based tax benefit.

That means the structure of the transaction matters.

Suppose a buyer offers:

Option A

Buy the shareholders’ stock for $20 million

Option B

Buy the company’s assets for $20 million

These transactions can have very different tax consequences. A stock sale may potentially allow an eligible shareholder to use Section 1202. An asset sale generally does not produce the same shareholder-level QSBS exclusion simply because the company itself was a qualified small business. Therefore, founders should consider the tax consequences of the transaction structure during negotiations.

Don’t Let the Buyer Decide the Tax Strategy After the Deal Is Signed

A buyer may prefer an asset acquisition. A seller may prefer a stock sale. The difference can be significant. If the company has potentially qualifying QSBS, the tax consequences should be modeled before the transaction structure is finalized.

For a large transaction, the tax difference can affect the founder’s net proceeds, not merely the amount reported on the tax return.

QSBS Is a Planning Opportunity—Not a Guaranteed Exclusion

It is tempting to describe Section 1202 as a way to “sell your company tax-free.” That is too simplistic. QSBS has numerous requirements.

The analysis can involve:

• Entity classification
• Stock issuance
• Gross assets
• Active business requirements
• Holding periods
• Shareholder eligibility
• Stock basis
• Redemption rules
• Transaction structure
• Prior sales
• State taxation

A company can appear to qualify and still fail one of the requirements.

That is why QSBS should be treated as a tax-planning project, not a box to check at the end of an acquisition.

Final Takeaway: The Biggest QSBS Opportunity May Be the Planning You Do Years Before the Sale

For founders building valuable companies, Section 1202 can be one of the most powerful federal tax provisions available.

For qualifying stock issued after July 4, 2025, the rules now provide:

• A potential 50% exclusion after three years
• A potential 75% exclusion after four years
• A potential 100% exclusion after five years
• A potential exclusion of up to $15 million per taxpayer per issuer, subject to the alternative 10-times-basis limitation
• A higher $75 million gross-asset threshold for qualifying stock issued after July 4, 2025

But these benefits are only available when the statutory requirements are satisfied.

For founders, the most important lesson is simple:

Do not wait until your company is being sold to ask whether your stock qualifies for QSBS.

The best time to evaluate Section 1202 may be when the company is formed, when shares are issued, when investors come in, and whenever the ownership structure changes.

By the time a buyer submits an acquisition offer, many of the most important QSBS decisions may already be behind you.

Need Help Evaluating QSBS Before a Business Sale?

QSBS planning can involve entity structure, stock issuance, capitalization, holding periods, business activities, transaction structure, and federal and state tax considerations. A potential exclusion worth millions deserves more than a last-minute review.

Velin & Associates, Inc. is a tax strategy firm helping founders and business owners evaluate tax opportunities, entity structures, business transactions, and tax compliance requirements.

If you are building a company that could eventually be sold, QSBS eligibility should be evaluated well before the exit.

For more information about our tax planning and tax compliance services, contact Velin & Associates, Inc. today.

Velin & Associates, Inc.

8159 Santa Monica Blvd STE 198/200
West Hollywood, CA 90046
📞 323-902-1000
📧 dmitriy@losangelescpa.org

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This article is for general informational purposes only and does not constitute individualized tax, accounting, legal, or financial advice. Section 1202 contains numerous technical requirements, and eligibility depends on the Specific Corporation, stock issuance, shareholder, business activities, holding period, transaction structure, and applicable federal and state law.