The first step in the new QSBS schedule is worth less than its percentage. For stock acquired after July 4, 2025, section 1202 excludes 50 percent of qualifying gain after three years, 75 percent after four and 100 percent after five. Eligible gain per issuer is capped at the greater of $15 million, reduced by prior eligible gain from that issuer already counted toward the limit and indexed for taxable years beginning after 2026, or ten times basis. Section 1(h) treats the part that the 50 or 75 percent leaves taxable as section 1202 gain and taxes it at up to 28 percent, against a 20 percent top rate on other long-term gain.
Take an illustrative founder with $10 million of gain on stock with negligible basis and an unused cap, and count only those two top federal rates, leaving out other federal and state taxes. With no exclusion the tax would be $2 million. At three years it is $1.4 million, 28 percent of the taxable $5 million. At four years it is $700,000, and at five it is zero. The three-year step removes 30 percent of the tax, and each of the next two years removes another $700,000.
That gap makes the form of payment worth negotiating when an acquisition arrives between the third and fifth anniversaries. In a reorganization under section 368, section 1202(h)(4) treats acquirer stock received for QSBS as QSBS acquired on the date the old stock was acquired, so the clock keeps running inside the acquirer’s shares. If the acquirer is not itself a qualified small business at the exchange, the exclusion reaches only the gain that would have been recognized at that point, and appreciation after closing gets none.
Suppose the offer comes at month 40 and is $10 million either in cash or in acquirer stock. Cash leaves $8.6 million after the $1.4 million tax. Acquirer stock held past month 60 and sold for any amount up to $10 million is excluded in full, so the founder keeps the sale price. On those numbers the stock can fall about 14 percent before the cash comes out ahead, before counting what the cash could earn in the meantime. If a lockup or the founder’s own needs force a sale after the fourth anniversary but before the fifth, the exclusion is 75 percent and the cushion shrinks to about 7.5 percent. A sale before the fourth anniversary gets the same 50 percent as the cash would have.
The obvious objection is that a founder selling a small company should take the certainty. Twenty months is a long time to hold one company’s stock, and if the merger does not qualify as a reorganization, the holding-period rule does not apply at all. The risk is real, which is why the comparison needs the number. A 14 percent cushion is thin against a volatile acquirer over 20 months and may be ample against a large, stable one. Whether the deal qualifies is a question for tax counsel to settle before signing.
Cash does not have to end the clock either. Section 1045 lets a holder who sells QSBS held more than six months elect to defer the gain to the extent the proceeds buy other QSBS within 60 days, and section 1223 adds the sold stock’s holding period to the replacement stock’s for most section 1202 purposes. That trades a concentrated position in the acquirer for new private positions picked within two months, a risk of its own.
The value of waiting is capped. With negligible basis and an unused $15 million limit, before indexing, going from year three to year five saves at most 28 percent of half the cap, about $2.1 million. On $100 million of gain that is roughly 2 percent, which an ordinary move in the acquirer’s stock could erase. On a $10 million gain the saving is $1.4 million, or 14 percent, and on $20 million it is the full $2.1 million, about 10 percent. The negotiation matters most to founders whose gain sits near or under the cap.
The board, meanwhile, negotiates one form of payment for holders on different clocks, because each holder’s holding period runs from when that holder acquired the stock. In a company that issued founder stock in August 2025 and sold Series A shares in late 2026, a cash sale in late 2028 gives the founders the 50 percent step and gives any QSBS held by the Series A investors no exclusion under the schedule. The two groups can rationally want different forms of payment from the same offer.
For a founder whose gain sits under the cap and whose offer arrives in year three or four, the comparison that decides it is the breakeven decline against how far the acquirer’s shares have moved over comparable stretches, and it has to be made before the letter of intent fixes a cash price.