QSBS

Qualified Small Business Stock (QSBS) has become an increasingly central focus for founders and investors, as awareness of its potential tax benefits continues to grow. If stock qualifies as QSBS, a holder may be eligible to exclude up to 100% of federal capital gains on disposition subject to a cap equal to the greater of (a) $10 million, or $15 million for post-2025 issuances, and (b) 10 times the taxpayer’s initial basis in the shares. Further, with careful structuring and planning, founders and investors can maximize the QSBS exclusion.

In practice, founders, investors, and senior executives often seek confirmation, typically in the form of a company-level analysis or determination letter, that the corporation’s stock satisfies the applicable requirements at issuance. As QSBS planning has become more sophisticated, both the importance of this analysis and the consequences of getting it wrong have increased materially.

Background

Before 2010, the Internal Revenue Code Section 1202 generally provided individual taxpayers with what was, in most cases, a very small tax rate reduction for gains recognized from sales of QSBS that had been held for more than five years.

That all changed significantly following the 2008 financial crisis. In the wake of the crisis, Congress passed the Small Business Jobs Act of 2010 to encourage individual taxpayers to make additional equity investments in startup corporations during the remainder of calendar year 2010. The Small Business Jobs Act of 2010 included an amendment to Section 1202 that, for the first time, provided for a complete U.S. federal income tax exemption (with no application of the alternative minimum tax) for specific gains recognized by non-corporate investors on the sale of QSBS held for more than five years but only if the stock was purchased at original issue in the limited window after September 27, 2010 and before January 1, 2011.

Although initially intended as a tax incentive for stock issued during a limited period, the 0% rate for gains on QSBS became so popular that Congress began expanding it. Congress repeatedly extended the applicable window for issuance of the 0%-eligible QSBS in successive one-to-two-year tranches. In 2015, the Protecting Americans from Tax Hikes Act of 2015 made the 0% rate for specific gains from sales of QSBS a permanent tax benefit. The tax benefits of QSBS have significantly increased in both value and accessibility. In 2025, the One Big Beautiful Bill Act (“OBBBA”), which applies to issuances after July 4, 2025, raised the “cap” on tax-free gains and introduced more flexible holding periods for new investments. The following table highlights key differences between the pre-OBBBA rules and the new rules:

Several requirements must be satisfied before those benefits can be realized and, even if those requirements are met, there are important limitations on the amount of gain that can qualify for the 0% rate. These requirements and limitations are further discussed below.

General Requirements

The general requirements for qualifying for the 0% federal tax rate on gains from the sale of QSBS include the following:

1. Original Issue. The taxpayer must still be a non-corporate entity (individual, trust, or estate) and acquire the stock directly from a U.S. domestic C corporation.
2. Tiered Holding Periods. For stock issued after July 4, 2025, a taxpayer can now receive a partial exclusion earlier: 50% after three years, 75% after four years, and the full 100% after five years. Pre-OBBBA stock still requires a strict five-year hold to receive any benefit.
3. Gross Assets Test. For stock issued after July 4, 2025, the corporation’s aggregate gross assets cannot exceed $75 million (up from $50 million) at the time of issuance. Importantly, the amount of a corporation’s assets at any given time is generally measured by the corporation’s adjusted tax basis in those assets, except when any property is “contributed” to the corporation. In that case, for this purpose the property must be taken into account based on its fair market value at the time of the contribution.
4. Active Business Test. During substantially all of the taxpayer’s holding period of the stock, at least 80% of the issuing corporation’s assets must be used by the corporation in the active conduct of one or more qualified trades or businesses. This includes assets used in furtherance of a prospective active business, i.e., startup activities, research and experimentation, and in-house research. It also includes working capital, investments expected to finance research and experimentation or increased working capital within two years, and computer software rights that produce active business royalties. However, after the corporation has existed for two years, no more than half of its assets can be working capital or investments held for future research or working capital. Although many types of trade or business should qualify for this purpose, the following are specifically excluded: any trade or business involving the performance of services in the fields of health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage services. Also specifically excluded is any trade or business for which the principal asset is the reputation or skill of any of its employees.
5. No Significant Redemptions. The issuer of the stock must not have engaged in specific levels of buybacks (redemptions) of its own stock during specified periods before or after the date of issuance of the stock to the taxpayer.

Exclusion, Limitations, and the Rise of Structured Planning

A non-corporate taxpayer who recognizes gain from the sale of stock meeting the above requirements can thus generally qualify for a 0% federal income tax rate. However, the amount of gain eligible for this 0% rate is subject to a cap. Section 1202(b)(1) states that the aggregate amount of gain for any taxpayer regarding an investment in any single issuer that may qualify for these benefits is generally limited to the greater of (a) $15 million (Post-OBBBA), or (b) 10 times the taxpayer’s adjusted tax basis in the stock. For a taxpayer who invests cash in the QSBS, the basis would generally be equal to the cash purchase price. However, there is a special rule for when a taxpayer instead purchases the QSBS for in‑kind property (that is, other than cash). In those cases, the taxpayer’s basis in the QSBS, solely for purposes of these Section 1202 rules, is deemed to be an amount not less than the fair market value of the property transferred for that QSBS as of the date of such transfer (often referred to as the basis-is-not-less-than-value rule). The general purpose of the basis-is-not-less-than-value rule is to ensure that inherent built-in gain for any property contributed to a corporation in exchange for QSBS does not qualify for the Section 1202 benefits. Only the gains from the sale of QSBS that are attributable to appreciation in value of the QSBS occurring after the date of issuance are potentially eligible for the Section 1202 benefits.

These new rules now theoretically allow for exclusions of up to $750 million for certain large-scale investments and certain other circumstances. As a result, taxpayers increasingly employ planning strategies, such as “stacking” QSBS across multiple taxpayers (e.g., trusts), and “packing” assets into QSBS-eligible entities. These strategies can be effective but require careful implementation and are subject to scrutiny. In May 2026, the Treasury Department signaled that it will be issuing guidance addressing what it sees as abuse of the QSBS “stacking” strategy.

The IRS has shown growing interest in QSBS claims, particularly in large exit transactions. Areas of focus include active business qualification, asset valuation (especially for contributed property), and related-party and restructuring transactions. QSBS remains one of the most compelling tax incentives available to founders and investors, but its benefits are not automatic. As the regime has matured, so have the expectations around compliance, documentation, and planning. For those who get it right, the rewards can be substantial. For those who do not, the cost of missed qualification can be equally significant.

State Conformity

While federal benefits are permanent, state treatment varies wildly. As of 2026, many states, including New Jersey and New York, now align with federal Section 1202 rules, while Alabama, California, Mississippi, and Pennsylvania continue to tax QSBS gains at full state rates. Residents in certain states, including Texas, can achieve a true 0% effective tax rate on QSBS gains by combining the federal exclusion with a lack of state income tax.

Rollover of Gain

A taxpayer other than a corporation (i.e., individuals, partnerships, S corporations, estates, and trusts) may elect to roll over capital gain from the sale of QSBS held for more than six months if QSBS is purchased by the taxpayer during the 60-day period beginning on the date of sale. Accordingly, gain is recognized only to the extent that the amount realized on the sale exceeds the cost of the replacement QSBS purchased during the 60-day period, as reduced by the portion of such cost, if any, previously taken into account. To the extent that capital gain is not recognized, that amount will be applied to reduce the basis of the replacement QSBS. The basis adjustment is applied to the replacement stock in the order in which the replacement stock is acquired.

Treatment for Pass-Through Entities

Gain on qualified stock held by a partnership, S corporation, regulated investment company, or common trust fund is excludable if the entity held it for the required holding period and if the partner, stockholder, or participant to whom the gain passes through held an interest in the entity when the entity acquired the stock and at all times thereafter. However, the partner, stockholder, or participant cannot exclude the gain to the extent that his or her share in the entity’s gain is greater than what it was when the entity acquired the qualified stock.

The Bottom Line

QSBS has evolved from a niche tax benefit into a central component of early-stage investment planning, particularly in light of recent expansions under the OBBBA regime. The increased exclusion caps, more flexible holding periods, and expanded asset thresholds have made QSBS more valuable, and more widely accessible, than ever before. At the same time, these enhancements have accelerated the use of structured planning strategies and heightened IRS scrutiny, raising the stakes for both companies and investors. In this environment, QSBS should be viewed not as a passive benefit but as a strategic framework that requires thoughtful implementation from formation through exit. With proper planning, documentation, and coordination, taxpayers can unlock substantial tax efficiencies; without such planning, the opportunity may be irretrievably lost.