If you own startup stock, “QSBS” can sound like a box you either check or do not check. In reality, Section 1202 eligibility depends on a series of rules that apply to the company, the shares, the way you acquired them, and what the business does over time. The rules also changed on July 4, 2025 with the One Big Beautiful Bill Act (OBBBA), so keeping the pace with these updates is crucial to your company’s success investing in QSBS.

If you’ve already qualified and don’t need to review the requirements for QSBS, then check out what accounting strategies can maintain and maximize your investments.

This guide specifically walks through the QSBS requirements that determine whether stock can qualify. Many existing guides give outdated advice based on the old rules. Ours focuses on the current eligibility questions you need to answer before you start calculating the potential tax benefit. We’ll answer:

  • What is Qualified Small Business Stock (QSBS)?
  • What are the 5 Gating Tests
  • How OBBBA changed the QSBS Requirements
  • What is the Active Business Requirement?
  • What is the Holding Period Requirement (now tiered)?
  • What is the Per-Issuer Gain Exclusion Cap?
  • How to plan ahead to meet QSBS requirements
  • What are common QSBS mistakes?
  • Where to go next

What Is Qualified Small Business Stock (QSBS)?

Qualified Small Business Stock is stock in a qualifying domestic C corporation that can receive special federal tax treatment under Section 1202 (or “the gain exclusion”). Section 1202 can let shareholders exclude a large share of capital gains from federal tax when sold. Meeting the QSBS requirements can mean excluding 50% to 100% of the gain on a future exit.

When you hear a founder say, “Our company is a QSBS company,” that isn’t the whole picture. A company's status alone does not answer whether your particular shares qualify. Instead, the tax code looks at the corporation, the issuance of the shares, the shareholder, and the company's activities over time. This combination creates a practical challenge if you’re a founder: some of the relevant decisions for qualification happen years before anyone thinks about an exit. Proper, informed planning is absolutely necessary

So instead of asking only, “Is this company QSBS eligible?” ask:

Do these shares satisfy the Section 1202 requirements based on when and how I acquired them, the company's size at issuance, and what the company has done since then?

That is the question the rest of this guide addresses.

The Qualified Small Business Stock Requirements: The Five Gating Tests

Section 1202 eligibility rests on several core requirements. In broad terms, the stock must come from a domestic C corporation, qualify under the original-issuance and gross-assets rules, remain connected to a qualifying active business, and satisfy the applicable holding-period rules. The taxpayer also generally must fall outside the corporate taxpayer category.

Let’s take a closer look at each requirement according to the rules laid out by the IRS:

1. Domestic C corporation: “What kind of company issued the stock?”

QSBS must be stock in a domestic C corporation. An LLC interest or partnership interest itself does not qualify as QSBS. That said, it does not mean a company has to remain a C corporation forever simply because it once issued shares. It does mean that maintaining C corporation status plays a role in the QSBS requirements during the shareholder's relevant holding period.

2. Original issuance: “How did you acquire it?

Section 1202 applies to stock originally issued after August 10, 1993. For most founders, employees, and startup investors today, this requirement will not require much investigation, but it remains one of the five tests the IRS lists for determining whether stock qualifies.

The issuance date can become much more important for other parts of the QSBS analysis, particularly because the rules changed for stock issued or acquired around July 4, 2025.

3. Gross-assets test: “How big is the company at issuance?”

The gross-assets test requires the issuing C corporation to stay at or below the applicable aggregate gross-assets limit, both before and immediately after it issues the stock.

The details regarding thresholds can be found in our deep-dive on The QSBS Gross Assets Test.

4. Qualified active business: “What does the company do with assets over time?

You need to acquire your shares when the company originally issues them. In practical terms, buying existing shares from another shareholder usually does not satisfy the original-issuance requirement. There are exceptions, however. For example, the IRS recognizes certain situations involving gifts, inheritances, conversions, or exchanges of qualifying stock.

For founders and early employees, this requirement makes good stock records especially useful. You want documentation that establishes when the company issued the shares, how you acquired them, and what you provided in exchange.

5. Holding period: “How long have you held the shares?”

QSBS qualification does not depend only on what the company looked like on the day it issued your shares. The IRS looks at what happens during substantially all of the time you hold the stock. There are two distinct requirements that are easy to mix up:

80% rule

vs

“Substantially all”

During the holding period, the company must remain a C corporation and must use at least 80% of the value of its assets in the active conduct of one or more qualified businesses.

An ongoing requirement that applies through a majority of the time you own the shares, not a test the company only needs to pass once.

 

And then there’s the post-OBBBA change that has introduced a graduated holding-period structure. We will cover what those three tiers are in our more detailed review: The QSBS Holding Period: New 3-, 4-, and 5-Year Rules After OBBBA.

Eligible Taxpayers (Sec. 1202(a)(1))

Please note that Section 1202's exclusion applies to taxpayers other than corporations, subject to special rules for certain pass-through structures.

How OBBBA Changed the QSBS Requirements in 2025

The OBBBA changed Section 1202 for stock acquired after July 4, 2025. The new rules raised the gross-assets threshold from $50 million to $75 million, increased the applicable dollar cap from $10 million to $15 million, and introduced partial exclusions after three and four years. Stock acquired on or before July 4, 2025 generally remains subject to the prior framework.

Put simply, the new rules do not just replace the old rules for every share you own. Section 1202 now has different treatment depending on when the stock was acquired. For the following requirements, here is a visual breakdown:

Requirement

Pre-OBBBA

(Stock ≤ 7/4/2025)

Post-OBBBA

(Stock > 7/4/2025)

Holding period for exclusion

5 yrs → up to 100%; nothing sooner

3 yrs → 50%

4 yrs → 75%

5 yrs → 100%

Per-issuer gain cap

Greater of $10M or 10× basis

Greater of $15M or 10× basis

(indexed starting in 2027; no adjustment for inflation in 2026)

Aggregate gross-assets threshold

$50M

$75M (indexed)

 

The new three- and four-year tiers still come with a tax cost

If you qualify for a 50% or 75% exclusion, the portion of the QSBS gain that the exclusion does not shelter remains taxable under the special 28% capital-gain rules. Depending on your income, the taxable portion may also be subject to the 3.8% Net Investment Income Tax (NIIT). So, although the new tiers can provide a meaningful benefit before year five, they do not necessarily make an early sale tax-free.

The Active Business Requirement: Which Companies Don't Qualify?

A qualifying corporation must use at least 80% of its assets in the active conduct of one or more qualified businesses during substantially all of the relevant holding period. Section 1202(e)(3) also excludes several types of businesses, including many professional-service, financial, farming, and hospitality businesses, meaning they fail this test even if they meet all other requirements.

The basic rule has two parts: first, at least 80% of the value of the corporation's assets must support the active conduct of one or more qualified businesses. Second, the business itself cannot fall into one of Section 1202's excluded categories.

Which businesses does Section 1202 exclude?

The IRS identifies several categories that do not count as qualified businesses:

  • Services in fields such as health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage services
  • A business where the principal asset consists of the reputation or skill of one or more employees
  • Banking, insurance, financing, leasing, investing, or similar businesses
  • Farming, including raising or harvesting trees
  • Businesses involving products for which percentage depletion can apply
  • Hotels, motels, restaurants, and similar businesses

The reputation-or-skill rule

The company's actual business model is really important. A founder should not assume that adding “technology” to a company's description makes it a qualified business.

Suppose a company sells software and employs consultants who help customers implement it. That fact alone does not make the company an excluded consulting business. The analysis looks at the nature of the business and the role of the employees, not merely whether employees ever provide advice.

The 80% test also looks at the company's assets

The active-business requirement is not simply an industry-label test. The corporation must use at least 80% of its assets in the active conduct of qualified businesses during substantially all of the relevant period.

Section 1202 contains rules and exceptions that affect how certain working capital and other assets get treated. This is one area where a founder should not try to answer the question by looking only at the company's bank balance. An experienced tax expert can also review your case and check for any blind spots.

The Holding Period Requirement

For QSBS acquired after July 4, 2025, the holding period is tiered: hold three years for a 50% exclusion, four years for 75%, and five years for 100%. The clock starts at the original issuance. If you must sell before five years, a Section 1045 rollover can defer gain by reinvesting in replacement QSBS within 60 days.

View the full tier list and original issuance rules in this thorough overview of the QSBS holding period.

What if you need to sell before five years?

Section 1045 can provide a separate path for some shareholders who sell qualifying small business stock after holding it for more than six months but before reaching the Section 1202 holding period.

You can potentially defer some or all of the gain if you purchase replacement QSBS within 60 days after the sale and meet the other requirements. The IRS describes this as postponing the gain rather than simply eliminating it.

The Per-Issuer Gain Exclusion Cap

Section 1202 limits the amount of gain you can exclude for stock from a particular company. For stock acquired after July 4, 2025, the limit increased $10 million to $15 million. The statute also provides a 10-times-basis alternative for shareholders with a large initial investment. You use the larger applicable amount, subject to rules for prior exclusions and multiple issuances.

The basic calculation looks like this:

Per-issuer limit = greater of the applicable dollar amount or 10 × adjusted basis

Here is a simple example in steps:

  1. Suppose you invest $2 million in qualifying stock after July 4, 2025.
  2. Your 10-times-basis calculation is: $2 million × 10 = $20 million
  3. You compare that with the $15 million dollar limit.
  4. Because $20 million is larger than $15 million, the 10-times-basis calculation gives you the larger potential limit.

Contrast that example with this: suppose instead that your basis was $500,000. $500,000 × 10 = $5 million. In that case, the $15 million dollar limit would be larger.

The calculation can become more complicated if you have multiple purchases from the same issuer, sell shares in different years, or already used some of the exclusion. The statute has specific rules for those situations.

This is also why “QSBS gives you a $15 million tax break” is an oversimplification. The $15 million figure represents a limit on eligible gain, not a $15 million tax credit.

How to Plan Ahead to Meet QSBS Requirements

QSBS eligibility starts with decisions made long before an exit. Entity structure, financing timing, stock issuance, company assets, business activities, and recordkeeping can all affect the analysis. Planning early gives founders more options because some Section 1202 problems become difficult or impossible to fix after the relevant stock has already been issued.

Consider QSBS during major company events, not just during tax-return preparation. That can look like the following:

1. At incorporation

If a founder wants potential Section 1202 treatment, the company structure needs attention from the beginning. Section 1202 applies to stock in a C corporation, not stock issued by an LLC or S corporation.

2. Before a financing

Track gross assets before and immediately after each relevant issuance. The new $75 million threshold gives qualifying companies more room, but the threshold still creates a hard planning point. Act before the asset test closes the window.

3. During the company's growth

Review the active-business requirement as the company expands into new products, acquisitions, investments, or business lines.

A startup can change substantially between its seed round and exit. Its QSBS analysis should keep pace.

4. Before an exit

Review the entire stock history before signing the final transaction documents. That review can uncover questions about acquisition dates, basis, redemptions, conversions, previous transfers, and holding periods while there is still time to address them.

Common QSBS Mistakes That Can Put the Exclusion at Risk

QSBS problems often start with assumptions: assuming an LLC can issue QSBS, assuming the company's valuation determines the asset test, assuming a technology company automatically qualifies, or waiting until an exit to review the stock history. Section 1202 requires attention to the actual facts and documentation behind each issuance and holding period.

Here are some common reporting mistakes and suggestions for handling them:

Common QSBS mistake

Better approach

Assuming an LLC or S corporation can issue QSBS

Start with the corporation's actual federal tax status. QSBS refers to stock in a C corporation

Using company valuation for the gross-assets test

Review the Section 1202 gross-assets rules, which focus on aggregate gross assets and include specific aggregation rule

Checking the asset test only at the exit

Review the company's gross assets at the relevant stock issuance

Assuming every technology company qualifies

Evaluate the actual business activities and the 80% asset-use test

Ignoring excluded-service rules

Review whether the business falls into one of Section 1202's excluded categories

Ignoring redemptions

Review company repurchases around an issuance. Section 1202 contains rules that can affect qualification when the corporation redeems stock

Waiting until the exit to ask about QSBS

Review the position during major financing and corporate events, when planning options still exist

Conclusion: Qualify on Purpose, Not by Accident

For founders, the practical takeaway is simple: do not wait for an exit to investigate QSBS.

If you are building a company and want to understand how Section 1202 fits into your broader tax strategy, Arvo can help you evaluate the planning questions early, while there is still time to make informed decisions.

Where to go next: