QSBS §1202 for the American founder: why timing decides everything

Lawyer, Family Office

The concept

§1202 of the Internal Revenue Code is one of the most generous breaks in the U.S. tax code. On a sale of qualified small business stock (QSBS), a founder or early investor can exclude a large part — and in the best case, all — of the capital gain from federal tax. Enacted in 1993 and strengthened several times since, it was expanded more in July 2025, through the One Big Beautiful Bill Act (OBBBA), than in its entire prior history.

The logic is simple. If, at the time the stock was issued, the company was a U.S. C-corporation with gross assets below a threshold, carrying on an active business in a non-excluded field, and the investor received the shares at original issuance and held them long enough, then the gain on sale falls outside federal tax — in whole or in part. Sitting alongside it is §1045, which lets you roll the gain into new QSBS without breaking the benefit.

For an American living in the United States, this is a founder's dream in its purest form. But the moment that same person becomes a tax resident of another country, the picture inverts: §1202 is an exclusion from U.S. tax, and it says nothing to the country of the new residence. So the whole §1202 story for private capital is a story about timing.

How the exclusion works

The baseline rule for stock issued on or before 4 July 2025: held for at least five years, the gain is fully excluded — 100% for stock acquired after 27 September 2010. Earlier issuances carried 50% and 75% tiers, but those too were tied to the acquisition date rather than the length of holding. The excluded amount is capped per issuer at the greater of $10 million or 10 times the tax basis of the investment.

Who and what must qualify

The issuer must be a domestic U.S. C-corporation (not an S-corp, LLC or partnership), with gross assets of no more than $50 million at and immediately after issuance. At least 80% of assets must be used in an active qualified business. Service fields are excluded — health, law, accounting, consulting, financial and brokerage services, the performing arts — as are banking, insurance, mining, farming and the hospitality business. The investor must receive the shares at original issuance in exchange for money, property or services, not buy them on the secondary market.

What OBBBA 2025 changed

The One Big Beautiful Bill Act, signed on 4 July 2025, rewrote §1202 for stock issued after that date. A tiered schedule keyed to the holding period appeared: 50% exclusion at three years, 75% at four, and the full 100% from five years. That is a fundamental departure from the old 50/75/100, which depended on when the stock was acquired rather than how long it was held. For new issuances, partial relief became available well before the five-year mark.

The new thresholds

The per-issuer cap rose from $10 million to $15 million and is now indexed for inflation. The company's gross-assets threshold was lifted from $50 million to $75 million — more companies now fit within the small business definition. Both parameters apply only to stock issued after 4 July 2025.

Old stock stays on the old rules

Issuances on or before 4 July 2025 live under the prior rules: 100% at five years, a $10 million cap with no indexing, a $50 million asset threshold. You cannot restart the holding period to reach the new three- and four-year tiers; swapping old shares for new ones to capture better terms generally just destroys QSBS status. Keep 4 July 2025 in mind as the watershed between the two regimes.

Stacking: multiplying the benefit through trusts

The §1202 cap is computed per taxpayer — and that is what stacking exploits. A founder gifts part of the QSBS to several non-grantor trusts; each such trust is a separate taxpayer with its own cap ($10 million or $15 million depending on the issuance date). At exit the deal closes through several holders, and the aggregate excluded gain is a multiple of a single cap. The key condition is that the structure must be built in advance: the gift has to occur before the sale becomes legally binding, or the IRS will see an assignment of income and the technique fails.

§1045: the roll-over when five years are not up yet

If you have to exit QSBS before five years, the gain need not be recognized immediately — it can be rolled under §1045 into new QSBS: with the original shares held for more than six months, the investor has 60 days to reinvest the proceeds into other qualified small business stock. The holding period, in effect, continues, and you can reach the five-year mark on the new shares. A working tool for the serial founder who exits one project and enters the next.

Application

For an American founder or early investor who remains a U.S. tax resident, §1202 is pure savings: with a correct C-corp issuer structure and a sufficient holding period, a large part — often all — of the exit gain falls outside federal tax, and stacking through trusts scales the effect far beyond a single cap. For private capital with an international footprint, the value of §1202 lies in a window: realizing the built-in gain is sensible while the person is still a U.S. resident and has not come under another country's capital gains tax. After a move to a high-tax jurisdiction, the same sale produces local tax on the entire gain — with no credit to offset it.

Risks

There are purely American risks too. QSBS status is easy to lose: the wrong legal form, breaching the asset threshold at issuance, an excluded line of business, redemptions by the issuer in forbidden windows. Stacking holds up only with impeccable gift timing and genuinely independent trusts — hasty or sham arrangements get recharacterized by the tax authority. The cost of a mistake here is measured in millions of excluded gain, which is why the structure is checked before the deal, not after.