Somewhere in America this week, a newly retired employee will call their 401(k) provider, ask to roll everything into an IRA, and permanently destroy a six-figure tax opportunity in a ten-minute phone call. Nothing will flag it. The rollover is the standard advice, the paperwork is routine, and the provider has no obligation to mention what was just given up.
What was given up is called net unrealized appreciation, or NUA: a provision that can convert a large slice of ordinary income into long-term capital gain, but only for employer stock held inside a workplace retirement plan, only at specific moments, and only if the exit is executed exactly right. It is genuinely one of the better deals in the retirement tax code when the numbers line up. It is also, and this surprises people, frequently a worse deal than the boring rollover. This article covers both halves: how the election works, and how to tell which side of it you are on.
The Deal NUA Offers
Start with the default. Everything that comes out of a traditional 401(k) is ordinary income. It does not matter that the account grew through capital appreciation; the tax code treats every distributed dollar the same, taxed at rates that run as high as 37% (which in 2026 applies above $640,600 of taxable income for single filers and $768,700 for joint filers). Roll the account to an IRA and nothing changes except the address: basis and growth alike eventually come out as ordinary income, swelling your required minimum distributions along the way.
NUA is the exception, and it applies to exactly one asset: stock of your employer held inside that employer’s plan. Instead of rolling those shares to an IRA, you can distribute them in-kind to a regular taxable brokerage account. The tax treatment then splits in two:
The plan’s cost basis in the shares (what the plan paid for them over the years) is taxed as ordinary income in the year of distribution. This is the price of admission, and you pay it now.
The net unrealized appreciation (everything the shares gained inside the plan) is taxed as long-term capital gain whenever you eventually sell. Not ordinary income. And unusually, the long-term rate applies to the NUA slice no matter how soon you sell after distribution; there is no one-year waiting period on that portion.
Long-term capital gains in 2026 are taxed at 0% up to $49,450 of taxable income for single filers and $98,900 for joint filers, at 15% up to $545,500 and $613,700 respectively, and at 20% above that. The NUA slice carries one more quiet advantage: it is exempt from the 3.8% net investment income tax that otherwise applies above $200,000 of modified adjusted gross income for single filers and $250,000 for joint filers. For a household whose retirement withdrawals would otherwise land in the 22%, 24%, or higher ordinary brackets, moving appreciation from ordinary rates to 15% or 20% capital gains rates, with no NIIT, is a genuinely large repricing.
The Math, on Real Numbers
Here is the trade in concrete form. Suppose your 401(k) holds $500,000 of employer stock, and the plan’s cost basis in those shares is $80,000.
The NUA route: you distribute the shares in-kind and pay ordinary income tax on $80,000 this year. At a 24% bracket, that is roughly $19,200 of tax, due now, on money you have not sold. In exchange, the $420,000 of appreciation is long-term gain whenever you sell: about $63,000 at the 15% rate, and none of it exposed to the 3.8% NIIT.
The rollover route: no tax today. But all $500,000, basis and growth alike, eventually comes out as ordinary income. At the same 24% rate, that is $120,000 of tax, and the balance inflates every future RMD calculation on the way there.
The trade, stated plainly: prepay tax on $80,000 to convert $420,000 from future ordinary income into capital gain. The wider the gap between basis and value, the stronger the case. That ratio, basis relative to current value, is the single most important number in the entire decision, and it comes from the plan’s recordkeeper, not your own contribution history. Ask for it in writing and verify it before electing; the figure is occasionally wrong, and the election is not the place to discover that.
Employer stock worth $500,000 with an $80,000 plan basis, distributed under NUA or rolled to an IRA. Illustrative rates: 24% ordinary, 15% long-term capital gains.
Ordinary tax now on the $80,000 basis — about $19,200 at 24%.
$420,000 of appreciation taxed at long-term rates when sold — about $63,000 at 15%.
The NUA slice is exempt from the 3.8% net investment income tax.
$0 of tax in the year of the move.
All $500,000 taxed as ordinary income on withdrawal — about $120,000 at 24%.
The balance inflates every future required minimum distribution.
The Rules: One Shot, All or Nothing
If the math were the whole story, NUA would be simple. The execution rules are where prepared people succeed and casual people lose the election entirely.
You need a triggering event. NUA is only available after one of three events: separation from service, reaching age 59½, or the death of the account owner. (The statute adds disability as a fourth trigger, but for W-2 employees it does not apply; that trigger is available only to the self-employed.) No trigger, no election, no matter how attractive the math.
The distribution must be a lump sum. This is the phrase that does the most damage. “Lump sum” means the entire vested balance, across all similar plans of that employer, distributed within a single tax year following the trigger. Not just the stock: everything. The employer stock moves in-kind to the taxable account, and the rest of the balance can roll to an IRA in the normal way, preserving its deferral. Both legs must land in the same tax year.
The shares must move in-kind. Sold inside the plan and repurchased outside, the appreciation is just plan money like any other, and the opportunity is gone. The actual shares transfer to the brokerage account.
A stray distribution can void the election. Here is the trap that catches people who were not even thinking about NUA yet: take any partial distribution after a triggering event but before your lump-sum year, even a small one, and the lump-sum requirement generally cannot be satisfied until the next triggering event resets it. Someone who separates at 58, takes a modest withdrawal at 59, and then hears about NUA at 62 may find the door closed until a future trigger reopens it. The time to screen for NUA is before the first dollar leaves the plan, which is exactly why we treat it as a checklist item on every 401(k) with employer stock, not a strategy to remember later.
One piece of good news inside the rigidity: partial NUA is allowed. You are not forced to elect NUA on every employer share. If the plan tracks share lots, you can elect NUA treatment on the lowest-basis lots, where the conversion is most valuable, and roll the high-basis lots to the IRA with everything else. The lump-sum requirement still governs the year; the lot selection governs the tax.
The Penalty Wrinkle for Early Retirees
If you are under 59½ at distribution, the ordinary-income portion (the basis) is generally also subject to the 10% early distribution penalty. The appreciation is not; the penalty attaches only to the basis. And the familiar age-55 exception applies: separate from service in or after the year you turn 55, and distributions from that employer’s plan escape the penalty, basis included. For an executive retiring at 56 with low-basis company stock, that combination (age-55 exception plus NUA) can be one of the cleanest exits in the code. For someone separating at 52, the penalty on the basis is one more real cost to put into the comparison.
When NUA Loses
Now the half of the analysis that gets skipped, because NUA looks like a slam dunk and frequently is not. As we wrote in our piece on diversifying a concentrated stock position, NUA is a strategy to run the numbers on, not an automatic win. It loses in predictable ways:
High basis relative to value. This is the usual killer. If the plan’s basis is $350,000 on $500,000 of stock, you would prepay ordinary tax on $350,000 to convert only $150,000 of appreciation. The prepaid tax buys very little, and the plain rollover, with its continued deferral, usually wins comfortably.
Long deferral horizons. The rollover’s advantage is decades of continued tax-deferred compounding, and the NUA route surrenders it on the distributed shares. The younger you are and the longer the money would otherwise stay invested, the more that surrendered deferral is worth, and the larger the basis-to-value gap needs to be before NUA comes out ahead. A 55-year-old and a 72-year-old holding identical stock positions can reasonably reach opposite answers.
The distribution-year pile-up. The basis lands as ordinary income in a single year, on top of everything else that year contains. That income raises the year’s bracket, feeds the modified adjusted gross income that sets Medicare IRMAA surcharges two years later, and, for early retirees on marketplace coverage, counts toward the ACA subsidy cliff at 400% of the federal poverty level, where one extra dollar eliminates the entire premium credit in 2026. A well-timed NUA election often waits for a deliberately low-income year, the same gap-year logic that governs Roth conversion timing, and the two strategies compete for the same cheap bracket space when they share a year.
Concentration mistaken for strategy. NUA is a tax treatment, not an investment thesis. The shares arrive in the taxable account still representing a large single-company bet, often in the same company that paid your salary for decades. The tax tail should not keep a position your risk picture says to trim; the appreciation is long-term gain the day it arrives, so selling promptly costs nothing extra in rate terms. What happens to the shares after distribution is a portfolio decision, and it deserves to be made as one.
One estate-planning asterisk. Appreciated assets in a taxable account normally receive a basis step-up at death. The NUA portion does not; heirs still owe capital gains tax on the appreciation that accrued inside the plan when they sell. Growth after the distribution steps up normally. For a client whose plan is to hold until death, that missing step-up meaningfully weakens the NUA case, and it belongs in the model.
Two mechanical notes on the shares after distribution. Growth above the frozen NUA amount is its own layer: its holding period starts at distribution (so selling that layer within a year makes it short-term gain), and unlike the NUA slice, it is exposed to the 3.8% NIIT. Neither detail changes the big decision, but both change what a tax-aware sale looks like afterward.
For Beneficiaries: Check Before You Roll
Death is itself a triggering event, which means heirs can use NUA on a qualifying lump-sum distribution of employer stock from an inherited plan. It also means heirs can destroy it the same way employees do: by rolling the plan into an inherited IRA first, which forfeits NUA permanently. If you have inherited a 401(k) that holds employer stock, screen the position for NUA before any rollover paperwork moves, alongside the other decisions we cover in our guide to inheriting an IRA under the 10-year rule. The order of operations is the whole game.
How We Think About It
NUA sits in a small category of tax elections that are irreversible, easy to disqualify by accident, and only sometimes worth making. That combination is exactly why we lean toward screening early and deciding with a model rather than a story. The screen is simple: does any workplace plan hold employer stock, and what is the plan’s basis in it? The decision is not simple, because it hinges on the basis-to-value ratio, the years of deferral being surrendered, the shape of the distribution year (brackets, IRMAA, ACA exposure), the penalty picture before 59½, the estate intentions for the shares, and the concentration question that exists regardless of taxes. Those inputs interact, which is why we model the election against the rollover on a household’s actual numbers, the same way we approach every strategy that trades a certain tax bill today for an uncertain one later. Equity compensation decisions rarely travel alone; the broader landscape is in our overview of RSUs, ISOs, and the rest of the stock compensation alphabet.
Common Questions
Does the appreciation really get long-term treatment even if I sell immediately?
Yes, for the NUA slice. The appreciation that accrued inside the plan is long-term capital gain regardless of how long you hold the shares after distribution. Only the growth that occurs after the shares land in your taxable account runs on a normal holding-period clock, short-term if sold within a year of distribution, long-term after.
Do I have to take NUA treatment on all of my employer stock?
No. Partial NUA is allowed. If the plan tracks lots, the usual approach is to elect NUA on the lowest-basis lots, where converting ordinary income to capital gain is most valuable, and roll the high-basis lots to the IRA along with the rest of the account. The whole vested balance still has to leave the plan in one tax year.
I took a small withdrawal after leaving my employer. Did I ruin my NUA eligibility?
Possibly, for now. A distribution taken after a triggering event but before the lump-sum year generally prevents the lump-sum requirement from being met until a new triggering event occurs, such as reaching 59½ if your trigger was separation. This is worth confirming against your specific distribution history before writing the strategy off, and it is the reason to screen for NUA before any money moves.
Is the 10% early withdrawal penalty a problem for NUA?
Only on the basis, and only if you are under 59½ without an exception. The appreciation itself is not subject to the penalty. If you separate from service in or after the year you turn 55, the age-55 exception generally covers the basis as well.
What happens to NUA shares when I die?
The appreciation that accrued inside the plan does not receive a step-up in basis; your heirs owe capital gains tax on it when they sell. Growth after the distribution date steps up normally. If holding until death is the plan, this missing step-up is a real cost of the NUA route and should be part of the analysis before electing.