A few years ago, a founder I worked with sold his stake in a software company he’d helped build from four employees to nearly 60. The sale itself was the easy part. What kept him up at night afterward was the tax bill; he already had his eye on backing a friend’s new company and did not want to hand a large chunk of his gain to the IRS before he ever got the chance to reinvest it.
That conversation is what first got me deep into the mechanics of the Section 1045 rollover, and I have leaned on it with clients many times since.
I spend a lot of my time with entrepreneurs in the window right around a liquidity event, when decisions made in a matter of weeks can shape a family’s wealth for decades. For holders of Qualified Small Business Stock (QSBS), Section 1045 is one of the more useful and least understood tools available. It allows an investor to defer capital gains tax on the sale of QSBS by reinvesting the proceeds into new QSBS within 60 days of the sale.
I grew up on a farm in southeastern Minnesota, and if there’s one thing that upbringing taught me, it’s that you don’t let something you worked hard for slip away out of carelessness. I think about client gains the same way. A founder spends years building enterprise value, and the tax code offers a real, if narrow, opportunity to protect some of that value at the exact moment it converts to cash.
The Mechanics, Briefly
To qualify, the original stock must already meet Section 1202 requirements: issued by an eligible domestic C corporation with gross assets under $50 million at issuance, held more than six months before the sale. From there, an investor can elect to defer the gain by purchasing new QSBS with the sale proceeds within 60 days. The deferral only covers the portion reinvested: Sell for $2 million and reinvest $1 million, and half the gain is deferred while half is taxed normally.
The detail clients are most often surprised by is the holding period. When proceeds roll into new QSBS, the time already spent holding the original stock tacks onto the new shares. That matters because the full Section 1202 exclusion requires five years of ownership. One founder I worked with had held his original stock for three years before selling. Because his reinvestment qualified for the rollover, he only had two more years to go, not five.
A taxpayer must file a formal election with a timely return for the year of the sale. Miss that filing, and the benefit can be lost even when every other requirement was met.
Where This Trips People Up
The 60-day window is tighter than it feels. Clients deep in diligence on a new investment can watch a closing date slide past the deadline through no fault of their own. I encourage identifying a shortlist of qualifying reinvestment targets before the original sale even closes.
Not every early-stage company stays QSBS-eligible. An investor who assumes eligibility without written confirmation from the issuing company can end up with a rollover that later unravels.
The paperwork is easy to lose in the shuffle, especially during a hectic tax season when a founder is juggling multiple K-1s alongside their first major liquidity event.
Part Of A Bigger Plan
Founders and investors should not treat a 1045 rollover as a standalone tax move. It works best as one piece of a broader exit and reinvestment plan, built alongside a client’s CPA and estate attorney well before the original sale closes. That coordination gives everyone time to confirm eligibility on the new stock, model the holding-period math and put the election deadline on the calendar rather than discovering it after the fact.
For founders and investors sitting on QSBS ahead of a sale, the message is simple: The tax code gives you a real opportunity here, but only if you plan for it in advance.
Sharon Olson, CFP, CEPA is Managing Principal of Olson Wealth Group and Inspired Life Family Office.
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