Under Public Law 119-21, enacted on July 4, 2025 and also known as the One Big Beautiful Bill Act, the federal tax rules governing Qualified Small Business Stock (QSBS) under Section 1202 of the Internal Revenue Code (IRC) received their most significant expansion in decades, as documented by Davis Wright Tremaine. For eligible startup stock issued after July 4, 2025, founders no longer face an all-or-nothing five-year cliff to realize tax benefits, because the updated statute introduces graduated gain exclusions starting after three years, according to Cornell Legal Information Institute.
Specifically, the statute establishes a 50 percent gain exclusion for stock held for at least 3 years, a 75 percent exclusion for stock held for at least 4 years, and a 100 percent exclusion for stock held for 5 years or more, as outlined in the text of Section 1202 analyzed by Cornell Legal Information Institute. In addition to shorter holding horizons, the legislation raised the lifetime per-issuer gain exclusion limit from $10 million to $15 million, with annual inflation adjustments scheduled for taxable years beginning after 2026, as noted by Carta. The maximum corporate asset threshold at issuance was simultaneously increased from $50 million to $75 million, which allows companies undergoing substantial early venture rounds to preserve qualification across later capital events, as confirmed by Davis Wright Tremaine.
Navigating these updates requires early-stage founders to understand holding milestones and cap table asset thresholds to avoid unexpected tax friction at liquidity.
The Tiered Holding Period and the 28 Percent Tax Friction
Under previous law established for shares acquired after September 27, 2010, non-corporate shareholders had to wait a full five years to receive any federal capital gains relief under Section 1202, as detailed by Davis Wright Tremaine. Any sale prior to the 5-year mark triggered regular capital gains taxation without any exclusion, according to legal analysis from Davis Wright Tremaine.
With Public Law 119-21, equity issued after July 4, 2025 qualifies for partial tax relief on faster liquidity paths: 50 percent of eligible gain is excluded after 3 years, and 75 percent is excluded after 4 years, as codified in Cornell Legal Information Institute.
However, this early liquidity contains a significant tax consideration that founders frequently overlook. According to Davis Wright Tremaine, any remaining gain that is not excluded in connection with a sale at the 3-year or 4-year mark is taxed at a 28 percent capital gains rate rather than the standard 20 percent federal long-term capital gains rate. Section 1(h) of the Internal Revenue Code labels this non-excluded portion "section 1202 gain" and applies the 28-percent rate to it, according to the text published by the Cornell Legal Information Institute.
Because the non-excluded portion faces this 28 percent rate, an early exit after 3 years shields half the gain from federal tax, while the remaining taxable half is assessed at 28 percent instead of the preferential 20 percent baseline, as explained by Davis Wright Tremaine. Founders evaluating secondary tender offers, strategic buyouts, or early liquidity events between year 3 and year 5 must model this differential carefully against waiting for the full 100 percent exclusion at 5 years, as highlighted by Carta.
Crucially, these tiered provisions do not apply retroactively; stock acquired on or before July 4, 2025 remains bound to the preexisting framework, requiring a holding period of more than 5 years to achieve the 100 percent exclusion, as set forth in Section 1202 documentation from Cornell Legal Information Institute.
The $15M Per-Issuer Cap and the $75M Gross Asset Ceiling
Before the enactment of Public Law 119-21, Section 1202 capped the federal gain exclusion at the greater of $10 million or 10 times the taxpayer adjusted basis in the stock, as outlined by Davis Wright Tremaine. For shares issued after July 4, 2025, that static dollar ceiling rises to $15 million per taxpayer per issuer, with the alternative 10-times-basis provision remaining fully in place, according to Cornell Legal Information Institute. Starting in taxable years that begin after 2026, the $15 million threshold will adjust upward for inflation, giving long-term operators growing headroom against rising equity values, as confirmed by Cornell Legal Information Institute.
A parallel improvement occurred within the corporate qualification criteria. Historically, a company could only issue Qualified Small Business Stock if its aggregate gross assets never exceeded $50 million immediately before and immediately after issuance, as documented by Davis Wright Tremaine. The new statute lifts that limit to $75 million for stock issued after July 4, 2025, accompanied by post-2026 inflation adjustments, as reported by Carta and verified in Cornell Legal Information Institute.
This increase from $50 million to $75 million broadens the runway for fast-growing ventures, allowing them to complete larger early funding rounds while continuing to issue qualifying equity to incoming executives and strategic angel backers, as observed by Davis Wright Tremaine. Even so, once balance sheet assets including cash received in a funding round cross the $75 million threshold, any equity issued thereafter permanently loses QSBS eligibility for incoming recipients, as detailed by Cornell Legal Information Institute.
Cap Table Mechanics: Preserving Eligibility from Inception
To maintain QSBS protection under Section 1202, a startup must satisfy specific corporate entity and issuance requirements from its very first share distribution, as explained in the Knowledge guides for founders and corporate tax analyses by Carta.
The issuing entity must be organized as a domestic C corporation, meaning that partnerships and Limited Liability Companies (LLCs) cannot directly issue QSBS shares, as outlined by Carta. When an LLC converts to a C corporation, the stock is treated as acquired on the date of the exchange and its basis is not less than the fair market value of the property exchanged, under Section 1202(i)(1) as published by the Cornell Legal Information Institute. In practice, only gain above the fair market value at conversion can qualify for the exclusion.
Key Takeaways for a US Startup
For stock issued after July 4, 2025, the gain exclusion is 50 percent after 3 years of holding, 75 percent after 4 years and 100 percent from 5 years. The per-issuer exclusion cap reaches $15 million, with indexation after 2026, and the gross assets threshold at issuance rises to $75 million. An exit between the third and fourth year is therefore still partly taxed: the portion that is not excluded is taxed at 28 percent, against 20 percent for the standard federal long-term gains rate.
On structure, eligibility is decided at formation: the issuer must be a C corporation, and a company created by converting from an LLC has its stock treated as acquired on the date of the exchange, with a basis at least equal to fair market value. Only gain after the conversion can therefore be excluded. Modeling the exit date, the asset threshold and the legal form before each round remains the safest way not to lose the benefit.