QSBS Explained: How Section 1202 Can Make Your Startup More Attractive to Investors

Raising capital is one of the biggest challenges for an early-stage startup.

Investors are being asked to put money into a company that may have:

• limited revenue;
• a short operating history;
• an unfinished product;
• significant competition;
• and a real possibility of failure.

But the U.S. tax code provides a powerful potential incentive for investing in certain small businesses:

Qualified Small Business Stock — QSBS.

Under Section 1202 of the Internal Revenue Code, eligible non-corporate taxpayers may be able to exclude a substantial portion — and in some cases 100% — of the qualifying gain when QSBS is eventually sold.

Changes enacted on July 4, 2025 made QSBS even more relevant to startup founders and investors.

For qualifying stock acquired after July 4, 2025, investors may potentially receive:

• 50% gain exclusion after 3 years;
• 75% after 4 years;
• and 100% after 5 years.

The legislation also increased the per-issuer dollar limitation for newly acquired QSBS to $15 million and increased the gross-assets threshold for newly issued stock to $75 million, subject to the detailed rules.

For a successful startup investment, the potential tax impact can be enormous.

But QSBS is not automatic.

The company, stock, investor, business activities and holding period all matter.

This guide explains how QSBS works, what changed in 2025, what founders should track, and how startups can preserve the documentation investors may need years later.

Key Takeaways

• QSBS is governed primarily by Section 1202 of the Internal Revenue Code.
• The issuer generally must be a U.S. domestic C Corporation when the stock is issued.
• For stock issued after July 4, 2025, the company's aggregate gross assets generally cannot exceed $75 million before and immediately after the issuance.
• For stock issued on or before July 4, 2025, the corresponding gross-assets threshold generally remains $50 million.
• For QSBS acquired after July 4, 2025, the potential gain exclusion is phased in at 50% after 3 years, 75% after 4 years and 100% after 5 years.
• The new per-issuer dollar limitation for qualifying stock acquired after July 4, 2025 is generally $15 million, subject to the statutory rules and future inflation adjustments.
• Section 1202 also contains an alternative limitation based on 10 times the taxpayer's aggregate adjusted basis in qualifying stock of the issuer disposed of during the year.
• Stock generally must be acquired at original issuance rather than purchased from another shareholder.
• During substantially all of the investor's holding period, at least 80% of the company's assets by value generally must be used in the active conduct of one or more qualified trades or businesses.
• Certain service, financial, farming, hospitality and other businesses are excluded.
• QSBS is a shareholder-level tax benefit. The company itself does not receive the Section 1202 exclusion.
• There is no standard IRS equivalent of UK SEIS Advance Assurance.
• Good corporate, tax and accounting records can become critical when an investor claims QSBS treatment years later.

What Is QSBS?

QSBS stands for:

Qualified Small Business Stock

Section 1202 allows eligible taxpayers other than corporations to exclude some or all of the eligible gain from selling qualifying stock.

Conceptually:

Investor acquires qualifying startup stock

↓

Company satisfies the Section 1202 requirements

↓

Investor holds the stock for the required period

↓

Startup grows

↓

Investor sells the stock

↓

Some or all qualifying gain may be excluded from federal gross income

The potential benefit can be substantial.

What Changed in 2025?

On July 4, 2025, new legislation expanded Section 1202.

For QSBS acquired after July 4, 2025, the exclusion now phases in based on the investor's holding period.

This is a major change.

Historically, the principal Section 1202 exclusion generally required the stock to be held for more than five years.

For new QSBS, investors now potentially receive a partial exclusion sooner.

The Acquisition Date Matters

Founders should be careful when discussing the new rules with existing investors.

The 2025 changes did not simply convert every existing startup share into a 3-year QSBS asset.

The new phased holding-period regime applies to qualifying stock acquired:

after July 4, 2025.

For qualifying stock acquired after September 27, 2010 and on or before July 4, 2025, the longstanding 100% exclusion can still apply after satisfying the applicable five-year holding requirement.

Older stock can be subject to still different historical percentages.

The acquisition date therefore matters.

Example: $500,000 Startup Investment

Suppose an individual investor acquires newly issued qualifying shares from a startup after July 4, 2025 for:

$500,000

More than five years later, the investor sells those shares for:

$5,000,000

Gain:

$4,500,000

If:

• the shares qualify as QSBS;
• the investor is an eligible taxpayer;
• the company satisfies the applicable requirements;
• the required holding period is met;
• and the gain remains within the applicable Section 1202 limitation;

then potentially:

100% of the $4.5 million qualifying gain could be excluded from federal gross income under Section 1202.

That is why QSBS can be highly relevant to startup investors.

The New $15 Million Limitation

Section 1202 does not provide an unlimited exclusion.

For qualifying stock acquired after July 4, 2025, the new statutory per-issuer dollar limitation is generally:

$15 million

subject to the detailed statutory rules.

The $15 million amount is also scheduled for inflation adjustment for taxable years beginning after 2026.

For stock acquired on or before July 4, 2025, the corresponding historical dollar amount is generally:

$10 million

subject to the rules governing prior and current dispositions.

The 10× Basis Alternative

The dollar cap is not the only limitation.

Section 1202 also contains an alternative limitation based on:

10 times the aggregate adjusted basis

of the taxpayer's qualifying stock of the issuer disposed of during the taxable year.

This can matter for larger startup investments.

For example, assume an investor acquired qualifying stock for:

$2 million

and later sells it after satisfying the applicable holding requirements.

Ten times the original adjusted basis could potentially produce:

$20 million

as the relevant alternative limitation for the shares disposed of during the year, subject to Section 1202's detailed basis and limitation rules.

The actual exclusion calculation should therefore be performed at the investor level rather than assuming that every investor is simply limited to $15 million.

Which Companies Can Issue QSBS?

Not every startup can issue QSBS.

At the time of the relevant stock issuance, the company generally needs to be a:

domestic C Corporation

that satisfies the Section 1202 qualified-small-business requirements.

This is one reason venture-backed U.S. startups are often structured as C Corporations.

An LLC interest is not itself stock in a C Corporation.

S Corporation stock is also not QSBS.

Entity structure therefore matters before the investment occurs.

The $75 Million Gross-Assets Test

For stock issued after July 4, 2025, a qualified small business generally must have aggregate gross assets of no more than:

$75 million

both:

• before the stock issuance, under the applicable historical test; and
• immediately after the issuance, taking into account the amounts received in the issuance.

For stock issued on or before July 4, 2025, the corresponding threshold generally remains:

$50 million.

The new $75 million amount is also subject to inflation adjustment for taxable years beginning after 2026.

Gross Assets Does Not Simply Mean Company Valuation

This distinction is important.

A founder might say:

“Our Series A valuation is $90 million, so we cannot qualify for QSBS.”

That conclusion does not necessarily follow.

Section 1202's gross-assets test is not simply the company's latest venture valuation.

For this purpose, aggregate gross assets generally means:

• cash;
• plus the aggregate adjusted tax bases of other property.

Special rules apply to property contributed to the corporation.

For contributed property, Section 1202 can require the property to be treated as having a basis equal to its fair market value immediately after contribution.

So:

venture valuation ≠ Section 1202 aggregate gross assets

They measure different things.

The Original-Issuance Requirement

QSBS generally needs to be acquired by the taxpayer at:

original issuance

directly from the corporation or through an underwriter.

The stock can generally be issued in exchange for:

• money;
• qualifying property other than stock;
• or services provided to the corporation, other than underwriting services.

This means a typical primary financing can potentially qualify.

Example:

Investor → $1 million → Startup

Startup → newly issued shares → Investor

But consider a secondary transaction:

Investor → $1 million → Existing Founder

Existing Founder → existing shares → Investor

The buyer generally does not satisfy the ordinary original-issuance requirement merely by purchasing existing shares from another shareholder.

There are special statutory rules for certain transfers such as gifts, transfers at death and certain exchanges.

Can Founder Stock Be QSBS?

Potentially.

Section 1202 is not limited to outside venture investors.

Stock acquired at original issuance in exchange for money, qualifying property or services may potentially qualify if the statutory requirements are satisfied.

That means founder stock and certain employee stock can potentially be QSBS as well.

However, the details matter.

Founders should preserve records showing:

• incorporation date;
• stock issuance date;
• consideration paid or services provided;
• capitalization;
• company assets at issuance;
• and business activities.

Years later, those records may be much harder to reconstruct.

The Active Business Requirement

QSBS is not simply a test applied on the date shares are issued.

During substantially all of the taxpayer's holding period, the corporation must generally satisfy the Section 1202 active-business requirement and remain a C Corporation.

One of the core requirements is that:

at least 80% of the company's assets, by value

must generally be used in the active conduct of one or more qualified trades or businesses.

This means ongoing company activity matters.

What About Pre-Revenue Technology Startups?

A pre-revenue technology company does not automatically fail the active-business test simply because it has not started generating sales.

Section 1202 includes special treatment for certain:

• startup activities;
• research and experimental activities;
• and in-house research activities.

Assets used in qualifying startup or research activities can be treated as used in the active conduct of a qualified trade or business.

This is particularly important for software, AI, biotech and other R&D-heavy startups that may spend years building technology before meaningful revenue arrives.

What About Cash From a Funding Round?

Technology startups often raise more cash than they can immediately deploy.

Section 1202 includes special rules for working capital.

Certain assets held for:

• reasonably required working-capital needs; or
• investment with a reasonable expectation that they will be used within two years to finance qualifying research or increased working-capital needs

can receive special treatment under the active-business rules.

But founders should not assume that unlimited passive cash or investments can remain on the balance sheet indefinitely without affecting QSBS analysis.

The facts and timing matter.

Which Businesses Are Excluded?

Section 1202 specifically excludes certain trades and businesses.

These include businesses involving services in fields such as:

• health;
• law;
• engineering;
• architecture;
• accounting;
• actuarial science;
• performing arts;
• consulting;
• athletics;
• financial services;
• and brokerage services.

It also excludes businesses where the principal asset is the reputation or skill of one or more employees.

Other excluded businesses include:

• banking;
• insurance;
• financing;
• leasing;
• investing;
• certain similar businesses;
• farming;
• certain natural-resource businesses;
• hotels;
• motels;
• restaurants;
• and similar businesses.

A technology company therefore should not conclude:

“We sell software, so we automatically qualify.”

A company's actual activities matter more than the word “technology.”

For example, a SaaS product company and a consulting company using proprietary software may require very different Section 1202 analysis.

Is There a U.S. Equivalent of SEIS Advance Assurance?

Not in the same standardized form.

Under the UK Seed Enterprise Investment Scheme, a startup can apply to HMRC for Advance Assurance before completing the relevant investment.

Section 1202 does not provide a comparable routine IRS certificate that a startup applies for and then gives to every investor.

Instead, QSBS qualification depends on satisfying the statutory requirements.

That makes documentation particularly important.

The startup may need to help investors establish facts years later concerning:

• corporate status;
• original issuance;
• gross assets;
• business activities;
• use of assets;
• and other Section 1202 requirements.

Should a Startup Tell Investors Their Shares “Are QSBS”?

Founders should be careful with definitive language.

QSBS treatment depends on facts relating to both:

• the company;
• and the taxpayer.

Some requirements also need to remain satisfied during the investor's holding period.

A more careful statement might be:

“The company believes the shares are intended to qualify as Qualified Small Business Stock under Section 1202, subject to applicable requirements and each investor's individual tax circumstances.”

Tax counsel may recommend different wording depending on the financing.

The important point is not to present future tax treatment as guaranteed.

SAFE Investments and QSBS

This is particularly important for startup founders.

A SAFE is not itself corporate stock.

The investor generally receives contractual rights that may convert into shares later.

For Section 1202, the acquisition and holding-period analysis therefore requires consideration of when qualifying stock is actually acquired and whether any statutory holding-period rules apply.

Founders should not automatically tell an investor:

“Your QSBS holding period started when you wired the SAFE money.”

The SAFE terms, conversion mechanics and applicable tax rules should be reviewed.

For investors who care about QSBS timing, this can be a material part of the financing structure.

Convertible Notes and QSBS

A convertible note is initially debt, not stock.

When the note later converts into stock, the Section 1202 analysis needs to consider:

• whether the resulting stock satisfies the original-issuance rules;
• the corporation's gross assets at the relevant time;
• the acquisition date and holding-period rules;
• and other applicable requirements.

Again:

Funding date ≠ automatically QSBS acquisition date.

This distinction can become increasingly important when a startup remains on SAFEs or convertible notes for a long period before issuing equity.

What Happens If the Investor Exits Before the Full Holding Period?

For new QSBS acquired after July 4, 2025, Section 1202 now provides partial exclusion after the stock has been held for at least three years.

That means:

3 years → 50%

4 years → 75%

5+ years → 100%

But another provision can become relevant for earlier exits:

Section 1045.

Section 1045: QSBS Rollover

Section 1045 can allow an eligible non-corporate taxpayer to defer gain from selling QSBS held for:

more than 6 months

if qualifying replacement QSBS is purchased within:

60 days beginning on the date of sale.

The gain is generally recognized only to the extent the amount realized exceeds the cost of qualifying replacement stock.

The deferred gain reduces the basis of the replacement stock.

This is not the same as Section 1202 exclusion.

Section 1202 can permanently exclude qualifying gain.

Section 1045 generally defers gain by rolling it into replacement QSBS.

Example: Early Exit

Suppose an investor buys qualifying startup stock for:

$250,000

and sells it 18 months later for:

$1,000,000

The investor has not held new QSBS for the three years required for the new Section 1202 partial exclusion.

But if the applicable requirements are satisfied, the investor may consider Section 1045.

If the investor purchases qualifying replacement QSBS within the required 60-day period, some or all of the gain may potentially be deferred.

This requires fast tax planning.

Waiting until the following year's tax return may be too late to make the replacement investment.

How Is QSBS Claimed?

QSBS is ultimately claimed by the taxpayer.

It is not a deduction claimed on the startup's Form 1120 for the investor.

For an individual reporting a qualifying sale, the federal reporting can involve:

• Form 8949;
• Schedule D;
• and the Section 1202 exclusion.

Current IRS instructions direct taxpayers reporting a Section 1202 exclusion on Form 8949 to use adjustment code:

Q

and report the excluded amount as a negative adjustment.

The exact reporting depends on the transaction and taxpayer.

State Tax Treatment May Be Different

Section 1202 is a federal income tax provision.

Founders and investors should not automatically assume that every state follows the federal QSBS exclusion.

State conformity varies.

An investor can therefore potentially have:

federal Section 1202 exclusion

while still facing:

state income tax

on some or all of the gain.

Investors should review the rules applicable to their state of residence and other relevant jurisdictions.

What Should the Startup Document?

This is one of the most practical QSBS issues.

An investor may buy shares today and sell them:

5, 7, 10 or 15 years later.

At that point, they may need evidence about what the company looked like on the original issuance date.

The startup should therefore consider maintaining a permanent QSBS documentation file.

Useful records can include:

Corporate formation

• Certificate of Incorporation;
• incorporation date;
• C Corporation status;
• relevant reorganizations.

Stock issuance

• stock purchase agreements;
• board approvals;
• stock ledger;
• cap table;
• issuance date;
• consideration paid.

Gross assets

• balance sheet immediately before financing;
• balance sheet immediately after financing;
• bank statements;
• financing closing statement;
• supporting tax-basis calculations where relevant.

Business activities

• business plans;
• pitch decks;
• product descriptions;
• revenue model;
• R&D documentation;
• descriptions of the company's trade or business.

Ongoing compliance

• financial statements;
• tax returns;
• capitalization records;
• significant asset changes;
• acquisitions;
• redemptions;
• and major changes in business activity.

The goal is to avoid reconstructing a 2026 balance sheet in 2033.

Stock Redemptions Can Matter

QSBS contains anti-abuse rules involving corporate stock repurchases.

Certain redemptions from the taxpayer or related persons around the issuance can prevent stock from qualifying.

The rules also address significant company-wide stock purchases around the issuance period.

For example, Section 1202 contains a significant-redemption rule that can apply where, during the period beginning one year before and ending one year after the issuance, the corporation purchases stock with aggregate value exceeding 5% of the value of all its stock, subject to the detailed rules and exceptions.

This is another reason founders should review buybacks and secondary transactions as part of QSBS planning.

Example: Seed-Stage Technology Startup

Imagine a Delaware C Corporation developing an AI infrastructure product.

Before its seed round:

Cash: $1.5 million

Other assets at tax basis: $2 million

The company raises:

$8 million

through newly issued preferred stock after July 4, 2025.

Immediately after the financing, aggregate gross assets remain well below:

$75 million

The company:

• remains a domestic C Corporation;
• issues shares directly to investors;
• uses substantially all of its operating assets for software development and commercialization;
• conducts R&D;
• does not primarily provide excluded consulting or financial services;
• and maintains its corporate and financing records.

An individual investor purchases:

$1 million

of newly issued shares.

More than five years later, the shares are sold for:

$12 million

Potential gain:

$11 million

If all applicable Section 1202 requirements are satisfied, the investor may potentially exclude the entire qualifying $11 million gain from federal gross income because it falls within the applicable limitation.

The tax result is potentially enormous.

But it depends on facts established over several years — not merely on the company having been a “startup” when the investment occurred.

QSBS Due Diligence During Fundraising

Sophisticated investors may ask the startup for information supporting potential QSBS eligibility.

This may include:

• confirmation that the issuer is a domestic C Corporation;
• date of incorporation;
• stock issuance date;
• gross-assets analysis;
• capitalization history;
• description of business activities;
• use of financing proceeds;
• prior equity issuances;
• stock redemptions;
• corporate reorganizations;
• and representations in financing documents.

Founders should expect QSBS questions to become more important as the potential tax benefit increases.

Common Founder Mistakes

Practical Recommendations for Founders

Consider QSBS before the first financing

Entity structure matters.

Understand the issuance date

The applicable rules depend on when the stock was issued and acquired.

Calculate gross assets before and after major issuances

Do not rely on the company's headline valuation.

Keep tax-basis support

Section 1202 gross assets are not simply GAAP book equity or venture valuation.

Review the company's actual business activities

Technology branding alone does not establish a qualified trade or business.

Maintain C Corporation status where QSBS treatment is important

The corporation generally needs to remain a C Corporation during substantially all of the relevant holding period.

Review SAFE and convertible-note conversions

Do not assume the original funding date is automatically the QSBS acquisition date.

Monitor stock redemptions

Buybacks can affect qualification.

Create a permanent QSBS file

Preserve records at each financing.

Avoid guaranteeing investor tax treatment

QSBS is ultimately determined under the tax law based on company and taxpayer facts.

Coordinate accounting, tax and legal records

Your:

cap table → stock ledger → financing documents → financial statements → tax records

should tell the same story.

How Agbis Helps

QSBS Finance & Documentation Review

We help U.S. startups organize the financial records supporting fundraising and investor due diligence.

We can help review:

QSBS gross-assets support

Pre- and post-financing balance sheets

Stock issuance reconciliations

Investor payment reconciliations

Cap table reconciliations

SAFE and convertible-note accounting

Equity financing accounting

Historical financial records

Investor due diligence support

Investor-ready bookkeeping

Fundraising financial statements

Final QSBS eligibility and investor-specific Section 1202 tax treatment should be reviewed with qualified U.S. tax and legal advisers.

Disclaimer: This article is for general information only and is not legal, tax or investment advice. QSBS eligibility depends on the facts of each company, stock issuance and investor. Consult qualified US tax and legal advisers.