Section 1045 Rollovers: Preserving QSBS Benefits When You Sell Early

An acquisition, a tender offer, or a personal need for cash can force a sale of qualified small business stock before the holding period is met. Section 1045 offers a way to keep the clock running.

The qualified small business stock exclusion is one of the most valuable provisions in the tax code for Bay Area founders and early employees, but it comes with a waiting period. Stock acquired before July 5, 2025 must be held more than five years for any exclusion, and stock acquired after that date earns a 50%, 75%, or 100% exclusion at three, four, and five years under the 2025 legislation. When a sale arrives too early, Section 1045 may allow a taxpayer to defer the gain by rolling the proceeds into new qualified small business stock.

How the rollover works

The statute, available in full from Cornell's Legal Information Institute, applies to qualified small business stock held by a taxpayer other than a corporation for more than six months. If the taxpayer purchases replacement QSBS during the 60-day period beginning on the date of the sale, gain is recognized only to the extent the amount realized exceeds the cost of the replacement stock. The deferred gain reduces the basis of the replacement shares, and the holding period of the original stock is added to the holding period of the new stock for purposes of the Section 1202 exclusion.

Consider a hypothetical. An engineer purchased founder shares for $50,000 in 2022 and sells them in an acquisition in 2026 for $2,050,000, four years later and before the five-year mark that applies to pre-2025 stock. If she invests the full $2,050,000 in new QSBS within 60 days, she recognizes no federal gain in 2026. Her basis in the new stock is $50,000, and her holding period for exclusion purposes now dates from 2022. If instead she reinvests only $1,000,000, she recognizes $1,050,000 of gain currently and defers the rest.

Practical hurdles

The 60-day window is short, and it is measured from the sale date, not from when cash arrives. Escrowed or deferred acquisition proceeds complicate the calculation, and the replacement stock must itself satisfy the QSBS definition at the time of purchase: an original issuance from a domestic C corporation whose gross assets do not exceed the applicable threshold, which is $75 million for stock issued after July 4, 2025, and that uses at least 80% of its assets in an active qualified business. Buying shares from an existing holder on a secondary market does not count. In practice this means investing in a new startup, a friend's company, or a vehicle designed to source qualifying issuances, all of which carry the risk of early-stage investing.

That risk is the central trade-off. Rolling $2 million of gain into a single early-stage company to avoid tax converts a realized, diversifiable outcome into a concentrated, illiquid, and speculative one. Many taxpayers reasonably conclude that paying the tax and diversifying is preferable, particularly if the exclusion at stake is partial. Spreading the rollover across several companies reduces that risk but multiplies the diligence burden.

The California layer

Federal deferral does not travel to Sacramento. The Franchise Tax Board's Schedule D instructions state plainly that California does not conform to the deferral under Section 1045 or the exclusion under Section 1202. A California resident who completes a valid federal rollover still reports the entire gain on the state return and pays tax at ordinary rates, which reach 13.3% at the top. Cash to pay that state bill has to come from somewhere.

Reporting and coordination

A Section 1045 election is made on the return for the year of sale, and the taxpayer must track the reduced basis and tacked holding period on the replacement stock for years afterward, often across multiple investments. Stock held through a partnership or other pass-through entity raises additional questions about who makes the election and how the deferral is allocated. Because a mistake can forfeit both the deferral and the eventual exclusion, the election is typically handled by a tax professional experienced with Section 1202.

When it may fit

A rollover tends to make the most sense when the holding period shortfall is small, the gain is large relative to the taxpayer's net worth, the taxpayer intends to make early-stage investments anyway, and the taxpayer can absorb the California tax from other funds. When those conditions are absent, the simpler path of recognizing the gain is often the more prudent one.

This article is educational only and does not constitute tax, legal, or investment advice; consult a qualified professional before making a Section 1045 election.

Important Disclosures

Important Disclosures: Propulsion Capital Management is an investment adviser registered with the State of California Department of Financial Protection and Innovation. Registration does not imply a certain level of skill or training. This article is provided for general informational and educational purposes only and does not constitute investment, tax, legal, or accounting advice, nor an offer or solicitation to buy or sell any security or to adopt any particular investment strategy. The information is believed to be accurate as of the date of publication but is subject to change without notice; tax laws and regulations change frequently and their application depends on individual facts and circumstances. Nothing herein should be relied upon as a substitute for personalized advice from a qualified professional. Investing involves risk, including the possible loss of principal, and past performance is no guarantee of future results. Diversification does not ensure a profit or protect against loss. Any examples are hypothetical, are for illustrative purposes only, and do not reflect the experience of any client. Links to third-party websites are provided for convenience; Propulsion Capital Management does not endorse, and is not responsible for, the content of third-party sites. Propulsion Capital Management does not provide tax or legal advice; please consult your tax adviser or attorney regarding your specific situation.