Managing a Concentrated Stock Position Without a Huge Tax Bill
A single stock that grew into most of your net worth is both a blessing and a risk. Learn how staged selling, charitable gifting, and other tools reduce risk without a giant tax bill.
A retired engineer in Chandler sat across from me with a wonderful problem and a real one. After decades at a single company, a big chunk of his net worth, call it $1.8 million of a $2.6 million portfolio, was sitting in that one company's stock. The shares had grown beautifully, and he was rightly proud of them. But he barely slept. One bad earnings report or industry shift could erase a huge slice of his retirement overnight. The catch: nearly all of that value was unrealized gain, so selling meant a capital gains tax bill that made him wince. He felt trapped between two fears, the risk of holding and the cost of selling.
If you've built up a large position in a single stock, whether from an employer, an inheritance, or one early bet that paid off, this is one of the most important and delicate problems in retirement planning. Across Phoenix, Scottsdale, Gilbert, and the rest of Arizona, I see versions of it constantly, and the good news is there are sensible ways through it that don't involve handing half the gain to the IRS in one swing.
First, Why Concentration Is So Dangerous in Retirement
A single stock carries two kinds of risk: the market's risk, which everyone bears, and company-specific risk, the chance that this one business stumbles for reasons that have nothing to do with the broader market. A diversified portfolio washes away that second risk almost entirely. A concentrated position leaves you fully exposed to it.
When you were working, a hit to the stock was painful but survivable, you had income and time. In retirement, you're drawing on the portfolio and you don't have decades to recover. A single company can cut its dividend, miss badly, get disrupted, or simply fall out of favor. The history of "can't-lose" stocks that later collapsed is long, and retirees who had too much riding on one of them rarely got a second chance. The emotional attachment, "this stock made us rich, how could I sell it?", is exactly what makes the risk so easy to ignore until it's too late.
The Tax Problem That Makes People Freeze
The reason people sit on dangerous concentration is almost always taxes. Sell a low-basis stock and you owe capital gains tax on the appreciation. Sell it all in one year and you can stack up a large gain, possibly pushing you into a higher bracket, raising the tax rate on those gains, and even triggering Medicare premium surcharges. So the instinct is to do nothing, which just lets the risk grow. The answer isn't to ignore the tax, it's to manage the sale so the tax is spread out and minimized.
Staged Selling: Diversify on a Schedule
The workhorse strategy is simply to sell the position down over several years rather than all at once. By spreading sales across multiple tax years, you can keep each year's gain within a target bracket, smoothing the tax hit instead of taking it in one brutal lump.
This is where multi-year planning earns its keep. Maybe you realize a set amount of gain each year, filling up the room available in your current bracket without spilling into the next one. In lower-income years, perhaps early retirement before Social Security or required distributions begin, there may even be room to realize some long-term gains at a very favorable rate. Our capital harvesting tool is built to help you see how realizing gains deliberately across several years compares to taking the whole bill at once, and how it interacts with your brackets.
A disciplined, written schedule also takes the emotion out of it. You're not trying to time the stock's peak, you're methodically reducing risk and managing taxes on a plan you can stick to regardless of the headlines.
Charitable Gifting: Diversify and Erase the Tax
If you're charitably inclined, your concentrated, low-basis stock is one of the most tax-efficient gifts you can make. Donating appreciated shares directly, rather than selling them and giving cash, generally lets you sidestep the capital gains tax entirely and take a charitable deduction for the full market value, subject to the usual limits.
For retirees who give regularly, a donor-advised fund can supercharge this. You contribute a slug of appreciated stock in one year, get the deduction up front, remove that risk from your portfolio without triggering gains, and then grant the money out to charities over time on your own schedule. You've diversified, helped causes you care about, and avoided the capital gains tax, all at once.
Exchange Funds: A Look at a More Specialized Tool
For very large positions, an exchange fund (sometimes called a swap fund) is worth understanding at a high level. The idea: you contribute your concentrated stock into a pooled fund alongside other investors who are doing the same with their concentrated positions. In return, you receive an interest in the diversified pool. Done within the rules, this can defer the capital gains tax while giving you broad diversification instead of one risky stock.
The tradeoffs are real, though. Exchange funds typically require a substantial minimum, lock your money up for a long holding period (often around seven years), charge meaningful fees, and have specific eligibility and accreditation rules. They're a niche solution for sizable positions, not a default, and they deserve careful, conflict-free analysis before you commit.
Other Tools Worth Knowing
- Loss harvesting elsewhere. Realized losses in other holdings can offset gains from trimming the concentrated position, reducing the net tax in a given year.
- Step-up at death. Heirs generally receive a stepped-up cost basis on inherited assets, so for someone late in life with a strong estate plan, holding part of a position may make sense, this is a planning question, not a reason to ignore the risk while you're living on the money.
- Protective strategies. Various hedging approaches can limit downside on a position you're unwinding slowly, though they add cost and complexity and aren't right for everyone.
Notice a theme: most of these strategies pay no commission to anyone. That's exactly why they're often overlooked by advisors compensated through product sales. A fee-only fiduciary has no product to push here, just the incentive to find the lowest-tax path to a safer portfolio for you.
The Bottom Line
A concentrated stock position is a hidden risk that can undo a good retirement, and the fear of a tax bill is what keeps so many people frozen. You don't have to choose between the risk of holding and a giant one-time tax hit. Staged selling spreads the gain across years and brackets, charitable gifting can diversify and erase the tax at once, and for large positions, exchange funds offer a more specialized route, with real tradeoffs. The right mix depends on your brackets, your goals, and your timeline.
To see how unwinding a position gradually could play out across several tax years, start with our capital harvesting tool, then connect with a fee-only fiduciary advisor in Arizona who can map out a tax-smart plan to reduce your concentration risk.
Important Disclosures
This material is intended for informational and educational purposes only and should not be construed as individualized investment, tax, or legal advice. Consult your own qualified advisor before acting on anything discussed here.
Investing involves risk, including possible loss of principal. Tax rules change and outcomes vary by individual circumstances. Arizona Fee Only is a directory and does not provide investment, tax, or legal advice.