For employees who have spent a career at a public company and watched their 401(k) accumulate employer stock, the default rollover at retirement can be one of the most expensive financial mistakes available. Sweeping appreciated company shares into a traditional IRA along with everything else converts decades of capital gains into ordinary income — taxed at rates that can reach 37% federally. The Net Unrealized Appreciation, or NUA, election exists to prevent exactly that outcome, and it remains one of the most underused provisions in the retirement code.
The mechanics are straightforward in principle. When an employee takes a qualifying lump-sum distribution from a 401(k) that holds employer stock, the cost basis of those shares — what the plan paid for them over the years — is taxed immediately as ordinary income. The appreciation above basis, the NUA portion, is not taxed at distribution. Instead, it is treated as long-term capital gain property the moment it leaves the plan, regardless of how long the shares were actually held inside the account.
Why the Tax Difference Is So Large
Long-term capital gains in 2026 are taxed at 0%, 15%, or 20% depending on income. The 15% bracket runs roughly from $98,900 to $613,700 for married couples filing jointly. Ordinary income at the same income level can reach 24% to 32% federally, with state tax stacked on top.
Consider an employee retiring with $300,000 of company stock in the 401(k), built from a $40,000 cost basis. A standard IRA rollover preserves tax deferral but locks the entire $300,000 into ordinary-income treatment whenever it comes out — and required minimum distributions force that exit eventually. Under an NUA election, the same retiree pays ordinary tax on $40,000 in the year of distribution, then owes long-term capital gains rates on the $260,000 of appreciation only when the shares are sold. For a household in the 15% capital gains bracket, that's the difference between roughly $39,000 and $72,000 or more in lifetime tax on the appreciation alone.
The Rules That Trip People Up
NUA treatment is not automatic, and the IRS rules are unforgiving. Four conditions have to line up:
- A triggering event must occur. Acceptable events are reaching age 59½, separation from service, death, or disability. In-service distributions before a triggering event do not qualify.
- The distribution must be a true lump sum. The entire balance of the employer's qualified plan must come out within a single tax year. Partial distributions after a triggering event can disqualify the strategy entirely until another triggering event resets the clock.
- The company stock must be distributed in-kind. The shares move directly to a taxable brokerage account; they cannot be sold inside the plan first. Cash and other assets in the 401(k) can still be rolled to an IRA in the same transaction.
- Cost basis is taxed in the year of distribution. This creates a current-year tax bill that has to be funded from outside sources — often the most painful part of the planning.
A common misstep is rolling the entire 401(k) — including the company stock — to an IRA before talking to a tax professional. Once the shares are inside an IRA, the NUA election is permanently lost.
When NUA Makes Sense, and When It Doesn't
The strategy favors situations where the cost basis is small relative to the market value, the retiree expects to be in a 15% or higher long-term capital gains bracket later, and the retiree has cash available to pay the immediate ordinary-income tax on basis. It works particularly well for long-tenured employees of companies whose stock multiplied many times over their careers.
NUA is a poor fit when the basis is high relative to current value, when the retiree's ordinary-income bracket in retirement will be very low, or when the company stock should be diversified away aggressively for risk reasons — although NUA shares can still be sold quickly after distribution; the long-term capital gains treatment on the NUA portion is preserved.
Practical Steps Before Pulling the Trigger
- Pull a cost-basis report from your plan administrator. This is the single most important number; the strategy turns on the basis-to-value ratio.
- Model the lump-sum tax hit. A large distribution can push other ordinary income through higher brackets and trigger IRMAA Medicare surcharges.
- Coordinate with diversification. Concentrated employer stock is a real risk; an NUA election does not require holding the shares — it just preserves the favorable treatment on what's already accrued.
- Get the order of operations right. The shares and the rest of the plan typically move on the same day; sequencing errors are difficult to undo.
The NUA election is not exotic, but it is easy to forfeit by accident. For retirees with appreciated employer stock, the rollover paperwork that arrives in the mail is the moment to slow down — not speed up.
Sources: Fidelity Learning Center, Kitces.com, TurboTax, Ameriprise Financial, Wealth Enhancement Group, Calamos Wealth Management