The gain type depends on how the shares were acquired. Restricted stock with an 83(b) election produces capital gain measured from the election date. ISO shares in a qualifying disposition produce capital gain; in a disqualifying disposition they produce ordinary income on the spread at exercise. NSO shares generate ordinary income at exercise and capital gain thereafter.
The character of gain on a pre-IPO share sale — whether capital gain or ordinary income — depends on the equity instrument through which the shares were acquired and the sequence of events since acquisition. Restricted stock: shareholders who received restricted stock and made a timely 83(b) election have basis equal to the fair market value at the date of the election (typically low at early company stages) and recognize capital gain on sale equal to the difference between the sale price and that basis. The holding period for long-term capital gains starts from the election date. Shareholders who did not make an 83(b) election have basis equal to the FMV at vesting and recognize ordinary income as shares vest; their holding period for capital gains starts from each vesting date. Incentive stock options (ISOs): a sale that constitutes a qualifying disposition — held more than two years from the grant date and more than one year from the exercise date — produces capital gain. A disqualifying disposition — sold before satisfying both holding requirements — produces ordinary income equal to the lesser of (a) the spread at exercise (FMV at exercise minus exercise price) or (b) the actual gain on sale, with any excess classified as capital gain or loss. Non-qualified stock options (NSOs): the spread at exercise is ordinary income taxable in the year of exercise, regardless of when the shares are subsequently sold. The sale of shares acquired by NSO exercise generates capital gain (or loss) equal to the difference between the sale price and the FMV at exercise (the tax basis established at exercise).
Shares held more than one year qualify for long-term capital gains rates (up to 20% federal plus 3.8% NIIT), while shares held one year or less are taxed as ordinary income at rates up to 37%. The holding period start date depends on equity type: for restricted stock with an 83(b) election it starts at grant; for ISOs and NSOs it starts at exercise.
The distinction between long-term capital gain (one year or more) and short-term capital gain (one year or less, taxed as ordinary income) creates a substantial rate differential at the federal level. At the highest federal income bracket, the difference is approximately 13.2 percentage points (37% ordinary income versus 23.8% long-term capital gains including the net investment income tax). On $1 million of gain, that differential represents approximately $132,000 in additional federal tax. For founders and employees evaluating whether to sell pre-IPO shares shortly after exercise, the holding period analysis is central to the tax modeling. For restricted stock with an 83(b) election, the holding period starts at the date of the election and stock receipt — often at company formation or early hiring — which means founders who received stock years ago are almost certainly past the one-year threshold. For ISO and NSO exercises, the holding period starts at the exercise date, not the grant date. An employee who exercised options recently and is considering an immediate secondary sale may be selling at short-term capital gains rates. The comparison between (a) selling now at short-term rates and (b) waiting twelve months for long-term treatment should be quantified as part of any secondary sale tax analysis.
Selling before five years forfeits the Section 1202 QSBS exclusion entirely — there is no prorated benefit for partial holding. For founders holding up to $10 million in qualifying QSBS appreciation, early sale generates approximately $2.38 million or more in federal tax that would have been excluded under Section 1202.
Section 1202 of the Internal Revenue Code provides a capital gains exclusion of up to 100% on the sale of Qualified Small Business Stock, subject to a cap of the greater of $10 million or 10 times the taxpayer's adjusted basis. The exclusion rate is 100% for QSBS acquired after September 27, 2010. The requirements for QSBS status are: (1) common stock issued by a domestic C corporation; (2) acquired at original issuance from the corporation (not purchased on secondary markets); (3) the corporation had gross assets of $50 million or less at the time of issuance and immediately after; (4) the corporation is engaged in a qualified active business (most technology, software, and manufacturing businesses qualify; professional services such as law, finance, and health generally do not); and (5) the stock is held for more than five years. The five-year requirement is a binary gate — there is no prorated exclusion for partial holding periods under current law. A seller who has held for four years and eleven months receives no Section 1202 benefit. For a founder holding $10 million of QSBS appreciation, early sale costs approximately $2.38 million in federal capital gains tax that would have been excluded. For founders with gain above $10 million, the exclusion caps at $10 million per taxpayer per issuer, but the same binary structure applies to the excludable portion — partial holding does not produce partial exclusion. The decision to sell before the five-year QSBS mark is an economically significant one that should not be made without completing the full Section 1202 analysis.
California does not conform to the federal Section 1202 QSBS exclusion. California residents pay state income tax on the full capital gain at rates up to 13.3%, regardless of holding period or QSBS eligibility. California also taxes short-term and long-term capital gains at the same rates, eliminating the state-level benefit of the one-year holding threshold.
California's non-conformity with federal QSBS treatment creates a significant tax asymmetry for California residents compared to founders in states without income tax or in states that conform to Section 1202. For California residents, the federal QSBS exclusion eliminates federal capital gains tax on a qualifying five-year-plus sale, but California imposes its full state income tax — at rates up to 13.3% for the highest earners — on the entire gain. On a $10 million QSBS gain, California's tax on that sale is approximately $1.33 million, payable regardless of how long the stock was held. California also does not distinguish between short-term and long-term capital gains for state tax purposes — both are taxed at ordinary income rates. This means the one-year federal holding period threshold produces a federal tax benefit (long-term vs. short-term rates) but has no parallel California benefit. For founders evaluating a change of state residency before a major liquidity event — whether an IPO or a secondary sale — the California non-conformity issue is a central factor. Establishing bona fide residency in a state that conforms to Section 1202 before the sale, if sustainable and genuine, can achieve the full federal exclusion. However, California's Franchise Tax Board scrutinizes claimed changes of residency closely, particularly where the timing is proximate to a liquidity event, and the residency change must reflect a genuine shift in domicile and significant contacts.
Exercising ISOs and holding — rather than immediately selling — generates an AMT preference item equal to the spread at exercise. Selling in the same year as exercise (a disqualifying disposition) eliminates the AMT item. Selling in a subsequent year generates an AMT credit (minimum tax credit) that offsets regular tax in future years when regular tax exceeds AMT.
The interaction between ISO exercises and alternative minimum tax is one of the most complex areas of startup equity taxation and frequently generates unexpected liabilities for founders and employees. The AMT framework for ISOs operates as follows. When a taxpayer exercises an ISO and holds the resulting shares, the spread — the difference between the FMV of the shares on the exercise date and the exercise price — constitutes an AMT preference item. This amount is added to the taxpayer's alternative minimum taxable income (AMTI) and may result in AMT liability if AMTI exceeds the AMT exemption (approximately $137,000 for single filers and $220,800 for married filing jointly in recent years, subject to phaseout at higher income levels). For founders exercising ISOs in high-value companies, the AMT liability can be substantial — potentially hundreds of thousands of dollars on a single exercise. The secondary transaction interacts with this AMT exposure in two ways. If the ISO shares are sold in the same calendar year as exercise and the sale is a disqualifying disposition (does not meet the qualifying disposition holding requirements), the ISO spread is reclassified as ordinary income for regular tax purposes, and the AMT preference item is eliminated. This can reduce or eliminate AMT liability but substitutes ordinary income tax. If the ISO shares are sold in a subsequent calendar year, the AMT paid on exercise generates an AMT credit — the minimum tax credit (MTC) under Section 53 — which the taxpayer carries forward and uses to offset regular tax in future years when regular tax exceeds AMT. The MTC is refundable in part under rules enacted in the 2017 tax legislation. The optimal timing of an ISO-related secondary sale depends heavily on the interaction of these rules with the taxpayer's overall tax position.
Before committing to a sale, model: holding period and capital gains classification, QSBS eligibility and five-year status, ISO AMT implications, state tax (particularly California non-conformity), and basis (83(b) election impact). Engage a tax advisor with startup equity experience before agreeing to price or closing date.
The analytical framework for pre-IPO secondary sale tax planning covers six distinct variables that interact in ways that are not always intuitive. First, equity type and gain character: identify whether the shares produce ordinary income or capital gain, and in which tax year the income is recognized. Second, holding period: determine the exact holding period start date for capital gains purposes given the equity type, and model the after-tax difference between selling now versus waiting to cross the one-year (or five-year) threshold. Third, QSBS eligibility: confirm whether the shares satisfy all Section 1202 requirements and whether the five-year holding period has been met. Fourth, ISO AMT analysis: if the shares were acquired through ISO exercise, model the AMT implications of selling in the same year as exercise versus a subsequent year, and understand the MTC carryforward mechanics. Fifth, state tax: identify the seller's state of residency and whether that state conforms to the federal QSBS exclusion, and whether there are distinctions between short-term and long-term rates. Sixth, basis: confirm the tax basis of the shares, including the impact of any 83(b) elections, prior AMT adjustments, or basis adjustments from prior disqualifying dispositions. The after-tax proceeds from a secondary sale can vary by millions of dollars depending on how each of these variables resolves. The analysis is best completed before price negotiations begin, because the price needed to achieve a target after-tax result depends on the full tax picture. Engaging a CPA or tax attorney who specializes in startup equity — not merely a generalist accountant — is strongly advisable for any founder or employee with meaningful appreciated equity.
Gurpreet S. Bal is a corporate partner with 16 years advising on private equity, merger transactions, and public offerings for companies and investors at three of the world's top law firms. He has represented clients in hundreds of transactions with aggregate deal value exceeding $60 billion across AI, semiconductors, fintech, and emerging technology. For more information and to get in touch, visit gurpreetbal.com.