December 5 2025

The One Big Beautiful Bill Act (OBBB) has overhauled the rules governing qualified small business stock (QSBS), offering entrepreneurs and investors richer tax incentives. The new law introduces partial gain exclusions for shares held three and four years, increases the lifetime exclusion from $10 million to $15 million, and raises the gross‑assets eligibility threshold from $50 million to $75 million. These changes could spur more C‑corporation conversions and make equity stakes in small businesses more valuable.

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The U.S. tax code isn’t usually exciting reading material, but recent changes to the qualified small business stock (QSBS) provisions should be on every entrepreneur’s radar. The One Big Beautiful Bill Act, enacted late this year, contains provisions intended to stimulate investment in high‑growth startups by expanding the appeal of QSBS. Section 1202 of the Internal Revenue Code has long allowed investors who hold stock in qualified C‑corporations for at least five years to exclude 100 percent of capital gains up to a $10 million limit. The OBBB enhances that framework in three important ways.

First, it creates a tiered system of gain exclusions. Investors can now exclude 50 percent of capital gains after holding qualified stock for three years and 75 percent after four years. The full 100 percent exclusion still kicks in after five years. This change provides more flexibility for investors who may need liquidity before hitting the five‑year mark. For founders, it could make it easier to attract angel and VC investment because early exits will no longer trigger a total tax hit.

Second, the act increases the per‑issuer limit for excluded gain from $10 million to $15 million. This higher cap significantly raises the potential tax savings for investors who stake large sums in promising startups. Combined with the tiered timeline, it signals lawmakers’ intent to channel more capital into the innovation economy. Investors who previously hesitated at the $10 million cap may now see greater upside in backing growth companies.

Third, the OBBB raises the eligibility threshold: a company’s gross assets can now be as high as $75 million (up from $50 million) at the time of and immediately after the stock issuance. This opens the door for slightly larger businesses, those that have matured beyond seed stage but still operate at a scale where growth capital makes a difference, to qualify. It also broadens the playing field for potential investors, including family offices and venture firms that specialize in later‑stage rounds.

However, the benefits aren’t automatic. To qualify, a corporation must be a C‑corp engaged in an active trade or business with at least 80 percent of assets used for that purpose. Service firms such as law and accounting practices are excluded. Entrepreneurs currently operating as LLCs or S‑corps may consider converting to a C‑corp to take advantage of the new rules, but doing so requires careful planning. The double taxation of C‑corporations, profits taxed at the corporate level and again when distributed as dividends, remains a drawback. Founders must weigh whether the potential capital gains exclusion outweighs the ongoing corporate tax burden.

Another factor is the interplay with §174A, which governs research and development expenses. Under §174A, R&D expenditures must be capitalized and amortized over five years rather than deducted immediately. Businesses considering conversion should evaluate how the amortization requirement affects cash flow and whether the QSBS benefits offset that impact. Furthermore, companies should review their shareholder agreements, as conversions can trigger buy‑sell rights, voting changes and governance implications.

From a strategic perspective, the enhanced QSBS regime encourages long‑term investment in innovation while giving investors more optionality. Founders raising capital should highlight the tax advantages to potential backers. Investors may negotiate terms that align with the new holding‑period milestones, such as milestone‑based exits at years three or four. Advisors predict the changes could trigger a wave of C‑corp conversions among high‑growth startups seeking capital and provide a boost to secondary markets in private shares. For entrepreneurs, understanding these nuances is crucial to capitalizing on the tax windfall without stepping into regulatory pitfalls.

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