A successful business exit can create a significant federal tax bill. Section 1202 qualified small business stock, or QSBS, can allow eligible founders and investors to exclude up to 100% of qualifying capital gains from federal income tax. But the benefit depends on the company, the stock, the shareholder and the timeline—not simply whether the business is called a startup. At SWITCH, we evaluate those requirements early, model the potential savings and help build the documentation needed to support the position.

How Section 1202 QSBS works

Internal Revenue Code Section 1202 provides a gain exclusion for eligible noncorporate taxpayers selling qualifying stock in a domestic C corporation. Individuals, certain trusts and estates, and owners investing through qualifying pass-through entities may benefit. Corporate shareholders do not qualify.

The exclusion applies to qualifying stock gains, not ordinary operating income or the corporation’s gain from selling its assets. That distinction matters when negotiating an exit: a buyer’s preferred asset acquisition can produce a very different tax result from a qualifying stock sale.

Holding periods and the 2025 changes

Public Law 119-21, enacted July 4, 2025, expanded Section 1202. Acquisition and issuance dates now determine which rules apply:

  • Stock acquired after July 4, 2025: A 50% exclusion may apply after at least three years, 75% after at least four years and 100% after at least five years.
  • Stock acquired on or before July 4, 2025: The prior more-than-five-year holding requirement generally applies. Stock acquired after September 27, 2010, can qualify for a 100% exclusion; older shares may fall under the historical 50% or 75% rules.
  • Per-issuer gain limit: The eligible gain ceiling generally uses the greater of a dollar limit or 10 times the adjusted basis of qualifying stock sold during the year. The dollar limit is generally $10 million for older acquisitions and $15 million for acquisitions after July 4, 2025, subject to statutory coordination and prior exclusions.

The $15 million amount is indexed for inflation for taxable years beginning after 2026. Married-filing-separately rules and sales involving multiple acquisition dates require additional calculations. A partial exclusion does not mean the remaining gain automatically receives the usual 20% maximum capital gains rate; special 28% rate rules can apply to taxable Section 1202 gain.

Who qualifies for QSBS treatment?

Original issuance and shareholder requirements

Generally, the shareholder must acquire stock at original issuance directly from the corporation in exchange for money, eligible property other than stock, or services. Purchasing shares from another shareholder generally does not qualify. Certain gifts, transfers at death and partnership distributions can preserve eligibility under Section 1202(h).

Options, SAFEs and convertible notes require instrument-specific analysis; the investment date is not automatically the start of the QSBS holding period. For pass-through investments, Section 1202(g) imposes ownership-continuity and allocation requirements. We trace the actual issuance and ownership history rather than relying on a cap-table label.

Company size and business activity

Under Section 1202(d), the issuing corporation must satisfy a gross-assets test before and immediately after issuance, including the proceeds raised. For stock issued after July 4, 2025, the threshold is generally $75 million, indexed for inflation after 2026. Earlier issuances generally face a $50 million threshold.

This is a statutory gross-assets calculation, not a company valuation or revenue test. Cash generally counts at face value and other assets at adjusted tax basis, but contributed property is generally measured at fair market value. Predecessor and controlled-group rules can affect the calculation.

During substantially all of the shareholder’s holding period, the corporation must remain a C corporation and generally use at least 80% of its asset value in one or more qualified active businesses under Section 1202(e). Specific startup, research and working-capital rules may help, but excess investment assets can create problems.

  • Excluded activities include many professional services, such as health, law, accounting and consulting.
  • Banking, insurance, financing, leasing, investing and similar businesses generally do not qualify.
  • Farming, certain extraction businesses, and operating hotels, motels or restaurants are also excluded.
  • Real estate ownership or rental activity is not an automatic fit; nonbusiness real estate holdings face a separate statutory limitation.

The numbers: an illustrative founder exit

Assume a founder acquires original-issue shares in August 2025 for $100,000 and sells them in September 2030 for $12.1 million. Assume the corporation and shareholder meet every applicable requirement, there were no prior exclusions from that issuer, and the transaction is a qualifying stock sale.

The gain is $12 million. Because the shares were held for at least five years and the gain falls below the applicable dollar ceiling, the full gain could qualify for federal exclusion. At an illustrative combined 23.8% federal rate—20% capital gains tax plus 3.8% net investment income tax—the potential federal savings would be $2.856 million. Actual savings depend on the taxpayer’s circumstances; excluded Section 1202 gain generally is not subject to net investment income tax.

California does not conform to the federal Section 1202 exclusion. A California resident can owe California income tax on gain that is fully excluded federally. We model federal and state treatment separately.

Common mistakes and IRS scrutiny

QSBS is a fact-intensive tax position, not a designation a company can conclusively grant. A company’s QSBS representation is useful evidence, but it does not bind the IRS. Common issues include:

  • Starting too late: Converting an LLC or S corporation to a C corporation shortly before an exit generally does not turn prior ownership years into a QSBS holding period.
  • Ignoring redemptions: Certain stock repurchases around issuance can disqualify shares under Section 1202(c)(3) and Treasury Regulation Section 1.1202-2.
  • Losing operational eligibility: Changes in business activity or asset composition can undermine the active-business requirement.
  • Overlooking transaction structure: Asset sales, reorganizations, rollover equity and earnouts can change the analysis.
  • Assuming trusts multiply exclusions: Transfers require substantive tax and legal review, including grantor-trust, assignment-of-income and anti-abuse rules.

We seek subscription agreements, stock ledgers, capitalization records, tax returns, financial statements, gross-assets calculations and evidence of qualifying operations throughout the holding period. A supportable position connects those records to each statutory requirement.

How SWITCH implements the strategy

We start with an eligibility review, then build an acquisition-date and holding-period schedule, test the applicable gain limits and model federal and state outcomes. We identify documentation gaps before a financing round or sale makes them difficult to resolve.

If an exit comes too early, we may evaluate Section 1045, which can permit gain deferral when qualifying stock held for more than six months is sold and replacement QSBS is purchased within 60 days. This is a separate strategy with its own requirements, not an automatic exclusion.

Our team coordinates tax analysis with licensed attorneys on entity conversions, equity documents, trusts and transaction terms. SWITCH is not a law firm and does not provide legal advice. We assess options without promising that an exclusion will survive every factual or legal challenge.

Planning a financing round or business exit? Request a free consult with our team to evaluate whether Section 1202 QSBS belongs in your tax strategy.