THE SHORT ANSWER
For qualifying stock acquired after July 4, 2025, the amended QSBS rules provide 50%, 75% and 100% exclusion tiers at the relevant three-, four- and five-year holding periods. Those percentages concern eligible gain, subject to limits and other conditions; they are not tax rates or percentages of the sale price. Confirm the applicable lot and holding period before choosing a closing date.
Apply the right regime to the right stock lot
Record the original acquisition date, issuance date, transfers, basis and any replacement-stock history. The newer holding-period tiers apply to qualifying acquisitions after July 4, 2025. Older shares need their applicable older rules; a 2026 sale date does not automatically move them into the new regime.
(Public Law 119-21, section 70431)For an ordinary acquisition in August 2025, a sale in August 2026 has not reached three years. If a transfer or special holding-period rule is relevant, obtain a written lot-specific analysis rather than treating the age of the company as the shareholder’s holding period.
Interpret an exclusion percentage correctly
| Hypothetical eligible gain before tier and limits | Tier assumption | Amount excluded under that assumption |
|---|---|---|
| $6,000,000 | 50% | $3,000,000 |
| $6,000,000 | 75% | $4,500,000 |
| $6,000,000 | 100% | $6,000,000 |
The remaining taxable amount and resulting tax require separate analysis. Do not translate a 50% exclusion into a promise that every applicable tax rate is cut in half. Basis, prior issuer-related exclusions, dollar or basis-based limitations and other rules can affect the result.
Review the conditions that time alone does not solve
IRS guidance includes domestic C corporation status, original issuance or qualifying exceptions, gross assets and qualified-business conditions. The active-business test’s 80% asset-value measure is not an 80%-of-time shortcut for the separate substantially-all holding-period requirement.
(IRS: Schedule D instructions, QSB stock)Have advisors examine issuer history, operations and redemptions. Waiting until an anniversary does not repair every eligibility problem. Retain the evidence and calculations that support the conclusion, including any unresolved assumptions.
Compare waiting, selling and reinvesting
For each feasible sale date, ask your advisor for a tax reserve and compare personal liquidity, operating risk and actual buyer terms. A hoped-for lower reserve several years from now is not assured if business performance or offers change.
Section 1045 is a separate potential election: IRS instructions describe stock held for more than six months and replacement QSB stock purchased within the 60-day period beginning on the sale date. Do not assume that any reinvestment automatically tacks periods to reach a 100% exclusion; the specific basis and holding-period rules need analysis.
(IRS: Schedule D instructions, QSB stock)Use the proceeds planner for advisor-supported scenarios and the advanced planning agenda when a rollover or transfer is under consideration.
Owner questions
Is a 50% exclusion the same as a 50% tax saving?
No. It is an exclusion percentage of eligible gain under the applicable rules, not a guarantee about the resulting tax liability.
Does the 80% active-business test mean 80% of the holding time?
No. The asset-value measure and the separate substantially-all period requirement should not be conflated.
Does replacement stock automatically qualify after adding two and three years?
No automatic result should be assumed. Advisors must apply the specific acquisition, holding-period, basis and eligibility rules.
Sources and review scope
Source review completed . The sources below support the identified concepts or rules; they do not validate hypothetical amounts or a valuation of your business.
- Public Law 119-21, section 70431
July 4, 2025 amendments to QSBS holding periods, limits and gross assets. Read with section 1202.
- IRS: Schedule D instructions, QSB stock
Original issuance, domestic C corporation, gross assets and qualified-business conditions.
Confirm tax, legal, accounting and lending applications with the relevant professionals. Historical market observations describe the stated period and reported sample.
This is educational material. Industry figures and program rules can change; check the original sources and your advisors before applying them to a transaction. Calculator scenarios are not appraisals, lending decisions, or offers.
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