Qualified Small Business Stock (QSBS) Requirements: Pre and Post-Big Beautiful Bill

The QSBS rules changed on July 4, 2025. The One Big Beautiful Bill Act left the original Section 1202 framework in place for stock issued earlier, and created an expanded version for stock issued afterward, with higher caps, higher asset thresholds, and partial exclusions at three and four years, rather than an all-or-nothing five-year cliff.

This guide walks through every QSBS requirement under both regimes.

• Stock issued on or before July 4, 2025, follows the original rules ($50M gross assets, $10M exclusion cap, five-year cliff). Stock issued after that date follows OBBBA rules ($75M gross assets, $15M cap, tiered holding periods).
• You must acquire shares directly from the issuing corporation.
• Professional services, financial services, hospitality, and natural resource businesses are disqualified. Companies selling products to those industries generally still qualify.
• The holding period clock for stock options starts at exercise, not at grant. This catches many tech employees off guard.

Section 1202 of the tax code allows non-corporate taxpayers to exclude up to 100% of federal capital gains on the sale of qualifying C corporation stock. 

Consider Marcus, a founding engineer who exercised early options at a Series A startup. At exit, his shares produce $8M in capital gains; a full QSBS exclusion eliminates federal capital gains tax on the entire amount. Without it, he owes roughly $1.9M (the 20% long-term capital gains rate plus the 3.8% net investment income tax). However, the federal exclusion doesn’t extend to state taxes, so if Marcus is a California resident, he’d still owe state tax on the full $8M gain since California doesn’t conform to Section 1202.

The key is meeting every requirement at three levels: the corporation, the shareholder, and the stock itself.

Four corporate-level tests determine whether a company’s stock can qualify as QSBS. Failing any one of them disqualifies every share in that round.

1. Domestic C Corporation

The issuing company must be organized as a domestic C corporation at the time the stock is issued and for substantially all of the holding period. S corporations, LLCs, and partnerships do not qualify. Conversion timing is critical: if a company starts as an LLC or S-corp and later converts to a C-corp, only stock issued after the conversion can qualify. Pre-conversion equity is permanently disqualified.

2. Aggregate Gross Assets Test

At the time the stock was issued, the corporation’s aggregate gross assets cannot exceed a specific threshold. For stock issued on or before July 4, 2025, the limit is $50M. For post-OBBBA stock, the threshold increases to $75M, with inflation indexing beginning in 2027.

Gross assets are measured as the sum of cash, the adjusted tax basis of other property, and the proceeds from the sale itself. This means a large funding round can push a company over the threshold at the moment shares are issued. However, subsequent growth above the cap does not retroactively disqualify previously issued stock. A startup worth $2B today can still have QSBS-eligible shares from its seed round, provided the company’s gross assets were under the threshold when those shares were issued.

3. Active Business Requirement (80% Test)

At least 80% of the corporation’s assets by value must be used in the active conduct of a qualified trade or business for substantially all of the holding period. The company must maintain this threshold continuously.

A working capital exception allows cash and cash equivalents to count as “active” assets if the company has a plan to deploy them within two years. After the corporation has existed for two years, no more than 50% of its assets can rely on this exception. Startups sitting on large cash reserves from a recent raise should be aware of this ceiling.

4. Qualified Trade or Business

The corporation must operate a qualified trade or business, defined by exclusion in Section 1202(e)(3). If your company falls into one of the excluded categories, no other requirement matters.

Excluded Industries Under Section 1202(e)(3)

The following categories of businesses are specifically excluded from QSBS eligibility:

Professional services encompass health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, and athletics. A law firm organized as a C-corp cannot issue QSBS. Neither can a medical practice or an engineering consultancy.

Financial services cover banking, insurance, financing, leasing, investing, and brokerage operations. Private equity firms, hedge funds, and insurance companies are all excluded.

Natural resources businesses, including farming, mining, oil and gas extraction, and timber operations, fall outside the qualified trade or business definition.

Hospitality operations, specifically hotels, motels, and restaurants, are disqualified regardless of corporate structure.

The broadest exclusion is the reputation or skill provision: any business whose principal asset is the reputation or skill of one or more employees. This catch-all can apply to talent agencies, celebrity-driven brands, and similar ventures.

Companies that sell products or tools to excluded industries generally do qualify. A healthcare SaaS platform that helps hospitals manage billing is not itself in the health services business. A legal tech company building contract automation tools is not practicing law. Most venture-backed technology companies (software, SaaS, hardware, biotech R&D) pass this test without issue.

Only non-corporate taxpayers can claim the QSBS exclusion. This includes individuals, trusts, and estates. C corporations holding QSBS cannot claim the exclusion for themselves.

Pass-through entities add a layer of complexity. Partnerships, LLCs taxed as partnerships, and S corporations can hold QSBS and pass the exclusion benefits through to their eligible owners. The catch: each individual owner must have held their interest in the pass-through entity at the time it acquired the QSBS and must hold that interest continuously through the disposition of the stock. If you buy into a fund after it has already acquired the QSBS, you do not inherit the exclusion.

The exclusion is applied on a per-issuer, per-taxpayer basis. Each qualifying taxpayer gets their own exclusion cap for each issuing company. This creates planning opportunities, particularly around gifting (covered in the next section).

Even when the company and shareholder both qualify, the stock itself must meet specific acquisition and holding requirements.

Original Issuance Requirement

The stock must be acquired directly from the issuing corporation in exchange for money, property (other than stock), or services rendered. Secondary-market purchases never qualify for QSBS treatment for the buyer. Buying shares from another shareholder, through a private transaction, or on a secondary marketplace means you do not get the exclusion on those shares, no matter how perfect the company’s eligibility profile.

This rule matters most for employees with stock options. Shares you receive by exercising options count as the original issue date; they come directly from the company. Shares you buy from a departing coworker do not.

Options vs. Stock

For stock options (both ISOs and NSOs), the QSBS holding period starts at exercise, not at grant. If you received an option grant in 2022 but exercised in 2025, your five-year clock started in 2025. This distinction trips up many employees who assume their grant date matters. It does not.

Holding Period

This is where the OBBBA created the most significant change. The holding period requirements now depend entirely on when your stock was issued.

Pre-July 4, 2025 stock follows an all-or-nothing cliff: you must hold for more than five years to receive any exclusion. Sell at four years and 364 days, and you get nothing.

Post-July 4, 2025 stock follows a new tiered system, giving partial exclusions at shorter holding periods. The non-excluded portion at the three-year and four-year tiers is taxed at 28%, not at preferential long-term capital gains rates.

The QSBS exclusion is not unlimited. Each taxpayer faces a per-issuer cap on the amount of gain they can exclude.

For pre-OBBBA stock, the cap is the greater of $10M or 10x the adjusted basis in the stock. For post-OBBBA stock, the cap increases to the greater of $15M or 10x adjusted basis, with inflation indexing on the $15M figure beginning in 2027. Taxpayers who are married filing separately see their cap halved ($5M for pre-OBBBA, $7.5M for post-OBBBA).

Consider Priya, a VP of Engineering who exercised options with a total adjusted basis of $200,000 in stock issued after July 4, 2025. Her per-issuer cap is the greater of $15M or $2M (10x her basis). She can exclude up to $15M in gains from that single company.

Pre-OBBBA and post-OBBBA blocks must be tracked separately within the same issuer. If you hold both vintages, each block uses its respective cap. You cannot combine them or double-dip.

A powerful planning strategy involves gift stacking: because the exclusion is per-issuer, per-taxpayer, gifting QSBS to eligible family members (children, non-grantor trusts) gives each recipient their own exclusion cap. A founder with $40M in post-OBBBA QSBS gains could gift shares to multiple family members, each of whom receives up to $15M in exclusion capacity. The tacking rules preserve the original holding period for gifted shares.

Several traps can foil your QSBS eligibility even when the fundamentals are in place.

Section 1202(c)(3) contains two anti-churning redemption rules: one that disqualifies a specific shareholder’s stock when the company redeemed shares from them or related parties within four years around the issuance, and a broader one that disqualifies all stock in a two-year window if the company made significant redemptions (more than 5% of value) of anyone’s shares. Routine buybacks require careful timing analysis against any QSBS-eligible stock sales.

The “substantially all” trap catches companies that pivot. The active business requirement must be maintained for “substantially all of” the holding period. If a qualifying SaaS company pivots into consulting (an excluded industry) or begins holding excessive idle cash beyond the working capital exception limits, it can permanently disqualify QSBS status.

Portfolio securities and excess real estate also present risk. If more than 10% of the corporation’s assets are invested in non-subsidiary stocks or securities, or in real estate not used in the active business, the company fails the active business test.

Does California conform to the federal QSBS exclusion?

No. California does not conform to Section 1202 and taxes QSBS gains as ordinary income at the state level. If you are a California resident selling QSBS, you will owe state tax on the full gain even if 100% is excluded federally. Structuring the timing and residency around a QSBS exit requires careful state-level tax planning.

Can I use Section 1045 to roll over QSBS gains into a new qualifying investment?

Yes. Section 1045 allows you to defer gain on the sale of QSBS held for more than six months by reinvesting the proceeds into new QSBS within 60 days. The replacement stock must meet all QSBS requirements independently. This can be useful when you want to exit a position before the five-year holding period but defer the gain into a new qualifying company rather than pay tax. The deferred gain reduces your basis in the replacement stock.

How do I document QSBS eligibility for the IRS?

There is no formal IRS certification process for QSBS. The burden of proof falls on the taxpayer. You should maintain records of the stock purchase agreement showing original issuance, the company’s gross assets at the time of issuance (request this from the CFO or legal team), confirmation of C-corp status, and documentation that the company operated a qualified trade or business throughout your holding period. Many companies will provide a QSBS eligibility letter upon request. Keep all records indefinitely, as the IRS can challenge the exclusion on audit years after the sale.

What happens to QSBS eligibility if my company goes through a merger or acquisition?

It depends on the transaction structure. In a stock-for-stock exchange that qualifies as a tax-free reorganization, your QSBS status can carry over to the acquiring company’s stock, provided the acquirer also meets QSBS requirements. In a cash acquisition, the sale triggers the exclusion (or disqualification) at that point. If the acquiring company does not independently qualify as a QSBS issuer, you lose the exclusion on any replacement shares received. Mixed consideration deals (part cash, part stock) are split accordingly, and each component is analyzed separately.

Can I convert pre-OBBBA stock to post-OBBBA treatment through a reorganization?

Generally no. Stock issued on or before July 4, 2025, remains subject to the pre-OBBBA Section 1202 rules, even after most reorganizations, recapitalizations, or share exchanges. Under standard tacking rules, the original issuance date and stock character generally carry over to the replacement shares rather than resetting under the new regime.

QSBS eligibility comes down to one date and three checks. The corporation, the shareholder, and the stock each have requirements to satisfy. The July 4, 2025, line then determines which cap and holding-period rules apply to your specific shares.

Documenting and preserving QSBS eligibility requires proactive planning, not a last-minute scramble before an exit. Navigating a similar situation? Contact us to discuss your QSBS position.