The Move Most People Miss
Here's a scenario that plays out thousands of times a year, almost always the expensive way. Someone retires or leaves a job after twenty years. Their 401(k) holds a big slug of company stock they accumulated through the employer match. The reflex — the thing the rollover paperwork practically does for you — is to sweep everything into an IRA. Clean, simple, tax-deferred.
And for that company stock specifically, it can be a five- or six-figure mistake.
Because there's a quirk in the code, tucked into Section 402, that treats employer stock in a retirement plan differently from everything else in there. Used right, it converts a pile of future ordinary income — taxed up to 37% — into long-term capital gains at 0/15/20%. It's called net unrealized appreciation, and it's one of the most overlooked moves in retirement tax planning. Let's walk it.
§ 01What NUA Actually Is
Net unrealized appreciation is just a difference between two numbers. Take the employer stock sitting in your 401(k):
- Your cost basis — what the plan effectively paid for those shares over the years.
- The stock's fair market value — what it's worth the day you take it out.
The gap between them is the NUA. If your company stock cost the plan $80,000 over your career and it's worth $400,000 today, your NUA is $320,000. That's the appreciation that's never been taxed — and the whole strategy is about getting that $320,000 taxed at capital gains rates instead of ordinary income rates.
Why does that matter so much? Because money in a traditional IRA loses its character. It doesn't matter that it grew as stock appreciation — when it eventually comes out, it's all ordinary income, taxed at your full marginal rate. The NUA election is the one chance to preserve the capital-gains nature of that growth before it gets locked into IRA treatment forever.
§ 02Basis Now, Gain Later
The mechanics are a trade: you pay a little tax now to avoid a lot of tax later. Instead of rolling the company stock into an IRA, you have the shares distributed in-kind — moved as actual shares — into a regular taxable brokerage account. Here's how the tax breaks apart:
The cost basis is taxed as ordinary income, this year. In the example above, you'd report $80,000 as ordinary income in the distribution year. That's the price of admission. If you're under 59½, a 10% early-withdrawal penalty also applies — but only to that $80,000 basis, never to the NUA.
The NUA is taxed at long-term capital gains rates — whenever you sell. The $320,000 of appreciation isn't taxed at distribution. It's taxed only when you sell the shares, and here's the gift: it's automatically treated as long-term, no matter how long you've actually held it. Sell the next morning and the NUA still gets 0/15/20% treatment.
Anything that happens after distribution plays by normal rules. If the stock climbs from $400,000 to $450,000 after you move it out, that extra $50,000 is a fresh capital gain — short-term or long-term depending on how long you hold past the distribution date.
So you've voluntarily paid ordinary-income tax on $80,000 to move $320,000 from the 37% world into the 20%-and-under world. When the basis is low, that's a spectacular trade.
§ 03The Four Rules You Can't Break
The IRS doesn't hand this out casually. All four conditions have to be true, and missing one quietly kills the whole election:
- Lump-sum distribution. You have to empty the entire vested balance of the plan within a single tax year. You can't take just the stock and leave the rest sitting — the whole account has to be distributed in one year.
- A qualifying trigger. The distribution must follow separation from service, reaching age 59½, disability, or death. No triggering event, no NUA.
- Employer securities. Only actual company stock qualifies. Mutual funds, target-date funds, the rest of your 401(k) menu — none of it gets NUA treatment.
- In-kind transfer. The shares have to come out as shares, into a taxable account. Sell them inside the plan first and you've destroyed the NUA — it's gone.
The two that trip people up most: selling the stock inside the plan before distributing it (instant disqualification), and accidentally breaking the lump-sum rule by taking a partial distribution in a prior year. Once you've taken any distribution after a triggering event, the clock and the rules get complicated fast. This is a move to plan deliberately, not stumble into.
§ 04When It's Brilliant — and When It's a Trap
NUA isn't a universal win. It's a ratio play, and the ratio is basis to value. The lower your cost basis relative to the current price, the better it works — because you're paying ordinary income on the small number to protect the big one.
The rough rule of thumb: NUA tends to shine when the cost basis is under about 25–30% of the stock's value. A $400,000 position with an $80,000 basis (20%) is close to ideal. A $400,000 position with a $300,000 basis (75%) is not — you'd be paying ordinary income on $300,000 just to capital-gains-protect $100,000, and you'd usually be better off rolling the whole thing into an IRA and keeping the deferral.
| Situation | NUA verdict |
|---|---|
| Low basis (under ~25% of value) | Strong — big gain shifts to capital rates |
| High basis (over ~50% of value) | Usually skip — roll to IRA instead |
| Under 59½ | Caution — 10% penalty on the basis |
| Need to diversify out of one stock | Weigh concentration risk first |
And don't forget the surtax. The NUA gain, when you sell, is investment income — which means it can attract the 3.8% Net Investment Income Tax on top of the capital gains rate for high earners. Still far better than ordinary income, but factor it in. The other quiet risk is the one that has nothing to do with taxes: holding $400,000 of a single employer's stock is a concentration bet, and "don't sell because of the tax" is how people ride one company all the way down.
§ 05The Death Twist Nobody Mentions
There's a wrinkle in the estate-planning corner that surprises even people who know the basic strategy. Normally, when you die, your assets get a step-up in basis — your heirs inherit them at current value and the built-in gain vanishes.
The NUA portion does not get that step-up. It's treated as "income in respect of a decedent," and your heirs still owe the long-term capital gains tax on that locked-in NUA when they sell. The appreciation that happened after you distributed the shares does get a step-up — but the original NUA carries its tax bill across to the next generation.
This flips the usual logic. If you're holding highly appreciated company stock and your main goal is to pass it on, the standard step-up might serve your heirs better than an NUA election would. If you intend to sell it in your own lifetime to fund retirement, NUA usually wins. The right answer depends on whether the shares are for you or for them — and that's a genuine planning conversation, not a default.
§ 06How to Pull It Off
If the numbers point toward NUA, the execution has to be precise. A checklist:
- Get your cost-basis number from the plan administrator first. Everything turns on the basis-to-value ratio. Don't guess it — request it in writing before you do anything.
- Don't sell the stock inside the plan. Not a single share. Selling first vaporizes the NUA election.
- Distribute the whole account in one tax year. Stock goes in-kind to a taxable brokerage account; the non-stock balance can be rolled to an IRA — but it all has to happen within the same calendar year as part of the lump sum.
- Mind the under-59½ penalty. If you're younger, model the 10% penalty on the basis against the long-run savings before committing.
- Plan the diversification. Decide upfront how quickly you'll trim the concentrated position once it's in the taxable account — the NUA stays favorable, but the single-stock risk is real.
Before you commit, run the eventual sale through the capital gains calculator to see the long-term rate the NUA would actually pay, then compare it against your ordinary marginal rate. The gap between those two numbers is the value of the strategy.
§ 07Key Takeaways
NUA converts employer-stock appreciation from ordinary income into long-term capital gains. You pay ordinary tax on the cost basis now; the appreciation gets capital gains rates when you sell.
It's a ratio play. Low basis relative to value (under ~25%) is where it shines; high basis usually favors a plain IRA rollover.
Four rules, all required: lump-sum distribution, a qualifying trigger, employer securities, and an in-kind transfer. Sell inside the plan and it's gone.
The NUA doesn't get a step-up at death — it passes to heirs with its tax bill attached, which can flip the decision for estate-focused holders.
Pair this with the 2026 capital gains guide for the rates, and the 3.8% NIIT for the surtax that can ride on top.
Sources: IRC §402(e)(4) (net unrealized appreciation in employer securities); IRS Publication 575 (Pension and Annuity Income); IRC §1411 (Net Investment Income Tax); IRC §691 (income in respect of a decedent). This is general information, not tax advice — NUA elections are irreversible, so model your specific basis before acting.