Net Unrealized Appreciation (NUA): When Company Stock in Your 401(k) Deserves a Second Look

Net unrealized appreciation (NUA) is a tax strategy for company stock in your 401k, letting gains be taxed at capital gains rates instead of ordinary income.

EQUITY COMPENSATION

Jaime L. Quiñones, CFP®, EA

8/20/2026

A blank 2026 IRS Form 1099-R for reporting distributions from retirement plans, IRAs, and annuities.

Executive Summary

What Net Unrealized Appreciation Actually Is

If you hold shares of your employer's stock inside a qualified retirement plan—typically a 401(k) or an employee stock ownership plan (ESOP) — you generally have two paths when you eventually leave the plan.

The conventional path is to roll everything, including the company stock, into an IRA. That preserves tax deferral, but it also converts every future dollar that comes out of that IRA into ordinary income, taxed at your regular income tax rates. For a large, highly appreciated stock position, that can mean surrendering favorable capital gains treatment on decades of growth.

The NUA path works differently. Instead of rolling the shares into an IRA, you distribute the actual company shares in kind into a regular taxable brokerage account. Here is the mechanic that makes the strategy worth understanding:

You pay ordinary income tax now only on your cost basis—what you originally paid for those shares.
The net unrealized appreciation — the difference between the fair market value at distribution and that cost basis — is not taxed at distribution.
That appreciation is instead taxed at long-term capital gains rates whenever you eventually sell the shares, automatically, regardless of how long you actually held them.

In plain terms: NUA = fair market value at distribution − your cost basis. You prepay ordinary income tax on the smaller number (basis) to unlock capital gains treatment on the larger number (the appreciation).

A hypothetical to illustrate the mechanics

Suppose an employee's 401(k) holds company stock with a cost basis of $100,000 and a current market value of $500,000. The NUA is $400,000.

Under the NUA approach, the employee reports $100,000 of ordinary income in the year of the in-kind distribution. The $400,000 of appreciation is taxed at long-term capital gains rates only when the shares are sold. Had those same shares been rolled into an IRA and later withdrawn, the entire value — and all subsequent growth — would have come out as ordinary income.

The NUA portion itself is always taxed at long-term capital gains tax rates; however, there are two important things to note:

1) NUA does not receive a step-up in cost basis at death.

2) Any appreciation that occurs after the distribution date is treated separately: it starts a new holding period, so gains realized within a year of distribution are short-term, and gains after a year are long-term

Capital Gains After the Stock Distribution

The NUA amount is only one layer of the tax picture. Once the shares actually land in your taxable account, everything that happens to them afterward is governed by an entirely separate set of rules.

A new cost basis is set on the distribution date

For purposes of any future sale, your cost basis in the shares is no longer the original basis you paid ordinary income tax on. It resets to the fair market value on the date of distribution — the same number used to calculate the NUA amount itself. That reset basis is what you compare against your eventual sale price to measure additional gain or loss.

A new holding period starts too

This is where people conflate two different rules. The NUA portion is always taxed as long-term capital gains, regardless of your actual holding period. But any additional appreciation after the distribution date follows the ordinary capital gains rules: sell within one year of distribution, and that additional gain is short-term, taxed at your ordinary income rate. Hold more than a year, and it qualifies for long-term capital gains treatment. The NUA clock and the post-distribution clock are simply not the same thing.

Two layers on a single sale

When the shares are eventually sold, the reported gain typically has two components: the NUA (fixed at distribution, always long-term) and the post-distribution gain or loss (short- or long-term, depending on how long you held the shares after the in-kind distribution). Brokerage cost-basis reporting is generally structured to reflect this split, but it is worth confirming the 1099-B detail lines up correctly with what your plan reported at distribution.

The reverse is also true: if the stock declines after distribution, that decline is a capital loss on the post-distribution portion, separate from the NUA amount, and it can generally be used like any other capital loss to offset gains elsewhere in your portfolio.

Why this matters for timing

This is the direct link back to concentration risk. Selling immediately after distribution locks in the NUA's long-term treatment but exposes any post-distribution gain to short-term rates. Waiting more than a year before selling lets that additional appreciation also qualify for long-term treatment — but it also means holding a concentrated single-stock position for longer. Neither choice is automatically correct; it is a trade-off between tax treatment and diversification that deserves a deliberate decision rather than a default.

The Rules That Make or Break the Strategy

NUA is one of those provisions where qualifying is a pass/fail test. Miss a requirement, and the entire election can be lost. Four conditions matter most.

A qualifying triggering event

You can only pursue NUA in connection with one of four events: separation from service (leaving the employer), reaching age 59½, death, or disability. Absent one of these, the door is not open.

The lump-sum distribution requirement

The distribution must qualify as a lump-sum distribution, meaning the entire vested balance of the plan is distributed within a single tax year. This is strict. You cannot spread it across two calendar years, and related plans of the same type from the same employer generally must be emptied as well. Non-stock assets in the plan (cash, mutual funds) can be rolled into an IRA as part of the same lump-sum event — you do not have to liquidate everything—but the timing rule still governs the whole account.

In-kind distribution of the shares

The employer securities must move as actual shares into a taxable, non-retirement account. If the plan sells the stock and distributes cash, or if the shares land in an IRA, the NUA opportunity is gone.

Beware of disqualifying "intervening" distributions

This is where well-intentioned people get tripped up. Once a triggering event occurs, if you take a partial distribution from the plan in one year and then attempt the balance in a later year, you can forfeit lump-sum treatment — unless a new triggering event resets the clock. Taking a routine partial withdrawal after separating from service, and only later learning about NUA, is a common and costly mistake. The order of operations is not a formality; it is the strategy.

When NUA Makes Sense—and When It Doesn't

The single most important point is: NUA is a tool, not a default. It can be genuinely valuable in the right circumstances (and is often overlooked); however, it is not always a clear benefit.

The cost-basis ratio drives the math

The strategy is most compelling when the cost basis is low relative to the current value. If your basis is a small fraction of market value, you prepay ordinary income tax on very little to secure capital gains treatment on a lot. As basis rises toward market value, you are prepaying tax on a large amount for a shrinking benefit—and at some point the math no longer favors NUA over a straightforward IRA rollover. A high basis-to-value ratio is often the first sign that NUA may not be worth it.

Beware of rebalancing

This often happens if the employer stock has experienced a prolonged decline in share price where the market value is close to your cost basis. I've also seen this teh opposite of this happen with long-tenured employees where they were regularly rebalancing their 401k and resetting their cost basis on their employer stock at an average higher price each time.

Your current tax rate versus your expected future rate

Because you pay ordinary income tax (on the basis) into the year of distribution, NUA tends to be more attractive when your current marginal tax rate is moderate, and the capital gains rate applied to the appreciation is meaningfully lower. If the distribution itself pushes you into a higher bracket, or if you expect to be in a low bracket in retirement anyway, the advantage narrows.

The 10% early distribution penalty

If you are under age 59½ and no exception applies, the cost-basis portion—the piece taxed as ordinary income—may also be subject to a 10% early distribution penalty. (Separating from service in or after the year you turn 55 is one common exception.) Notably, the NUA portion itself is not subject to that penalty. Still, for younger separating employees, the penalty on the basis can erode the benefit.

Concentration risk is a real cost

NUA only applies to employer securities, which means the strategy is inseparable from holding a concentrated position in a single company's stock. Many people who elect NUA do so precisely to unwind that concentration — selling a portion after distribution and paying long-term capital gains rates to diversify.

The estate-planning wrinkle most people miss

Assets that receive a "step-up" in basis at death allow heirs to avoid capital gains on prior appreciation. NUA does not get that step-up. The NUA portion is treated as income in respect of a decedent (IRD), meaning your heirs will still owe long-term capital gains tax on it when they sell. Appreciation that occurs after the distribution can qualify for a step-up, but the core NUA amount does not. If leaving assets to heirs is a priority, this changes the calculus considerably and deserves specific attention.

One more item for higher earners: the long-term capital gain on the NUA can be exposed to the 3.8% net investment income tax, which is worth factoring into the projection.

Partial NUA: The Compromise Worth Knowing About

Because NUA is not all-or-nothing, one of its most useful features is the ability to apply it to only a portion of the shares.

In practice, some plans hold company stock acquired over years at very different prices, creating share lots with very different cost bases. Where the plan's recordkeeping allows, you can apply NUA treatment to the lowest-basis lots — the shares with the most appreciation and therefore the greatest benefit — while rolling the higher-basis shares into an IRA to preserve deferral and avoid prepaying tax where the payoff is thin.

This "partial NUA" approach is often the sensible middle path. It captures capital gains treatment where it matters most, limits the ordinary income you accelerate, and lets you retain deferral on the rest. The catch is that plan cost-basis accounting varies—some plans track specific lots, others use an average cost — so what is actually possible depends on your specific plan's rules and reporting. Confirming that before you act is essential.

Why Timing Is Everything

Even when NUA makes sense on paper, execution lives and dies by timing.

The one-year rule:

The qualifying lump-sum distribution must be completed within a single tax year. That constraint interacts with everything else you have going on — bonus income, equity compensation vesting, a spouse's income — because the ordinary income on the basis stacks on top of your other income for that year.

Bracket management:

Since you control (within limits) the year in which you trigger the distribution, you can sometimes coordinate it with a lower-income year to soften the ordinary-income hit on the cost basis. For equity-compensated professionals whose income can swing with RSU vesting or bonus cycles, choosing the right year is not a minor detail.

Value at distribution locks in the NUA:

The appreciation figure is fixed at the fair market value on the distribution date. Waiting for further growth increases potential NUA, but it also prolongs concentration risk. There is no way to know in advance where the stock will trade, which is precisely why this is a planning decision rather than a market-timing bet.

Sequencing around the triggering event:

As noted earlier, an intervening partial distribution after your triggering event can disqualify the lump-sum treatment. The distribution has to be structured and sequenced correctly from the start.

A brief note on the distinction that trips up equity-compensation holders: NUA applies to employer securities held inside a qualified plan. It is a separate matter from RSUs, incentive stock options (ISOs), or non-qualified stock options (NQSOs) held outside your 401(k). Those carry their own tax rules. If you hold both, NUA is one piece of a larger, interconnected tax picture—not a standalone move.

Frequently Asked Questions

Do I have to sell the company stock right after taking the NUA distribution?

No. You can hold the shares in your taxable account and sell over time. The NUA portion keeps its long-term capital gains character whenever you sell, while any post-distribution growth follows normal holding-period rules. Some people sell a portion promptly to reduce concentration; others hold longer. The right pace depends on your goals and tax situation.

Can I use NUA if I roll part of my 401(k) into an IRA?

Yes — that is essentially what a partial NUA election does. You can apply NUA treatment to some of the employer shares (typically the lowest-basis lots) and roll the remaining assets, including higher-basis shares and non-stock holdings, into an IRA, provided the whole thing is completed as a single qualifying lump-sum distribution within one tax year.

What happens to the NUA benefit if I die before selling the shares?

The NUA portion does not receive a step-up in cost basis at death. It is treated as income in respect of a decedent, so your heirs will still owe long-term capital gains tax on that amount when they sell. Appreciation occurring after the original distribution may qualify for a step-up. This is an important consideration if wealth transfer is a priority.

Is NUA always the smarter choice than an IRA rollover?

No. NUA can be advantageous when the cost basis is low relative to value and the tax-rate math works in your favor, but it can be disadvantageous when basis is high, when the distribution pushes you into a higher bracket, or when concentration and estate considerations outweigh the tax benefit. It is a case-by-case decision, which is exactly why running the numbers before acting matters.

Let's Look at Your Specific Situation

NUA rewards precision and punishes mistakes. The eligibility rules, the partial-election mechanics, the timing, and the interaction with your broader tax and estate picture all have to line up — and once a distribution is taken incorrectly, there is often no way to undo it. If you hold appreciated employer stock inside a workplace retirement plan and want to understand whether NUA, a partial election, or a straightforward rollover fits your circumstances, reach out to me, and I can model the trade-offs before any irreversible steps are taken.

All content is for informational purposes only. It is not intended to provide any tax or legal advice or provide the basis for any financial decisions. Nor is it intended to be a projection of current or future performance or indication of future results.

Have you ever looked at box 6 on an IRS 1099-R form? Net unrealized appreciation (NUA) is a provision in the tax code that can allow highly appreciated employer stock held inside a workplace retirement plan to be taxed at long-term capital gains rates instead of ordinary income rates. It is frequently overlooked and misunderstood, but it is not universally beneficial — the math depends heavily on your cost basis and your tax picture. Precise execution is of the utmost importance because a single misstep can disqualify the strategy entirely. Additionally, partial elections and timing decisions add real complexity; this is an area where the details matter far more than the headline.