Net unrealized appreciation (NUA) is an IRS rule that lets you pull highly appreciated company stock out of your 401(k) and pay long-term capital gains rates on the growth instead of ordinary income tax. You pay ordinary tax only on what the shares cost you originally, then capital gains rates on the rest — often a 17-point spread.
Here’s the part almost nobody tells you: the “safe” move — rolling your entire 401(k), company stock and all, straight into an IRA — can quietly be the most expensive decision you ever make.
Do that, and you convert a capital-gains asset into an ordinary-income asset forever. Every future withdrawal gets taxed at rates up to 37% instead of a top capital gains rate of 20%. For someone sitting on a big pile of employer stock, that “boring” rollover can cost six figures.
Updated September 2026.
What is net unrealized appreciation (NUA)?
Net unrealized appreciation is the difference between what your employer’s stock cost inside your retirement plan (the cost basis) and what it’s worth today. If you bought in at $140,000 and it’s now worth $250,000, your NUA is $110,000.
The rule lives in IRC Section 402(e)(4). It applies to actual employer stock held inside a qualified plan — usually a 401(k) or an ESOP — not to mutual funds or index shares. If your plan holds real shares of the company you worked for, this is worth reading twice.
The whole strategy exists because of one gap: the difference between ordinary income tax rates and long-term capital gains rates. In 2026 the top ordinary rate is 37%, while the top long-term capital gains rate is 20%. NUA lets you route most of your gain through the cheaper lane.
How is company stock taxed under the NUA rules?
When you take the stock out correctly, the IRS splits it in two:
- Cost basis — taxed as ordinary income in the year you distribute the shares.
- The appreciation (NUA) — taxed at long-term capital gains rates when you sell, no matter how long you actually held it.
That second line is the magic. Even if you sell the shares the day after you distribute them, the growth still gets the long-term capital gains rate. You don’t have to wait a year.
Here’s how the two paths compare on a $250,000 stock position with a $140,000 basis:
| Approach | How the $110,000 gain is taxed | Rough tax on the gain |
|---|---|---|
| Roll everything into an IRA, withdraw later | Ordinary income, up to 37% | Up to ~$40,700 |
| Use NUA, sell as long-term gain (15% bracket) | Long-term capital gains | ~$16,500 |
Same stock. Same person. A difference of more than $24,000 on the gain alone — and that’s before you count the basis, which gets taxed either way. Scale that up to a $1 million stock position and the gap gets loud.
What are the four triggering events for NUA?
You can’t use NUA whenever you feel like it. The IRS requires a qualifying “triggering event” first. There are exactly four:
- Separation from service (you leave the employer)
- Reaching age 59½
- Total disability
- Death
Once one of those happens, the clock starts on your window to do this right. Miss the window or fumble the mechanics, and the tax break evaporates.
What is the lump-sum distribution requirement?
This is where most people trip. To qualify for NUA, you must empty the entire account balance of that employer plan within a single tax year. Not the stock alone — the whole plan.
The good news: you don’t have to take everything as a taxable payout. You distribute the company shares in-kind to a regular taxable brokerage account, and you can roll the rest of the plan (the mutual funds, the cash) directly into an IRA. As long as nothing is left in the plan by December 31, you’re clean.
One hard rule: the stock has to move as actual shares. If the plan sells your stock, sends cash, and you rebuy shares elsewhere, you’ve blown it. Cash breaks the chain.
Does the 10% early withdrawal penalty apply?
If you’re under 59½ when you trigger NUA — say you separated from service at 52 — the 10% early withdrawal penalty applies, but only to the cost basis, not the appreciation. There are exceptions, like the age-55 separation-from-service rule, so timing matters.
This is why NUA often shines most for people leaving work in their late 50s or triggering at 59½. You get the tax split without the penalty biting the basis.
When does NUA actually make sense?
NUA is not a free lunch, and the honest answer is: it depends on your numbers. It tends to win when the appreciation is large relative to the cost basis. A low basis and a high current value is the sweet spot — you pay ordinary tax on a small number and capital gains on a big one.
It works against you when the basis is high and the growth is small. In that case you’d be paying ordinary income tax up front on a large basis just to save a little on a modest gain. Sometimes the plain IRA rollover really is better. Run the math before you commit.
Three tradeoffs worth naming out loud:
- It’s irrevocable. Once you distribute the shares, you can’t undo it.
- Concentration risk. Keeping a fortune in a single company’s stock is its own kind of danger — ask anyone who rode one employer’s shares to zero.
- The basis tax is due now. You owe ordinary income tax on the cost basis in the year you distribute, whether or not you sell the shares.
Where do the 2026 capital gains brackets land? For single filers, the 0% rate runs up to $49,450, the 15% rate covers $49,451 to $545,500, and 20% kicks in above that. For married couples filing jointly, 0% runs to $98,900, 15% to $613,700, and 20% above. Smart NUA planning often means selling shares across a few years to stay in the 15% lane instead of getting shoved into 20%.
How does NUA fit the bigger tax picture?
NUA is one lever, not a whole plan. It pairs with the other moves that quietly decide how much of your retirement the IRS gets: managing taxes on your required minimum distributions, weighing Roth conversions in your low-income years, and sidestepping the most common retirement tax mistakes before they cost you.
The through-line across all of them is simple: the goal isn’t just a bigger pile of money, it’s keeping more of the pile after taxes. That’s the whole idea behind the Tax-Free Wealth Secrets framework — building income streams the IRS can’t keep chipping at year after year.
Frequently asked questions
Do I have to sell the company stock right away to use NUA?
No. Once the shares are in your taxable account, you choose when to sell. The appreciation still gets long-term capital gains treatment whenever you sell, even the next day.
Can I use NUA with mutual funds or an index fund in my 401(k)?
No. NUA only applies to actual employer stock — real shares of the company you worked for — held inside a qualified plan. Funds don’t qualify.
What happens to the appreciation if I die before selling?
The NUA portion generally does not get a step-up in basis at death — your heirs still owe long-term capital gains on it. Any growth after the distribution may step up. This is a spot to get professional advice.
Is there a limit on how much NUA I can use?
There’s no dollar cap on the appreciation itself. The real limit is the rulebook: a qualifying triggering event, a lump-sum distribution of the whole plan in one year, and shares moved in-kind.
Can I still roll the rest of my 401(k) into an IRA?
Yes. That’s the standard play — company shares go to a taxable brokerage in-kind, and everything else rolls to an IRA in the same tax year.
What if my cost basis is really high?
Then NUA may not be worth it. A high basis means a big ordinary-income tax bill up front. Compare it against a simple rollover before deciding.
The bottom line
If you’re leaving a job or hitting 59½ with a chunk of appreciated company stock in your 401(k), the default rollover advice could quietly cost you a fortune. NUA won’t fit everyone — but for the right person, routing decades of growth through capital gains instead of ordinary income is one of the cleanest tax breaks left in the code.
The trick is knowing whether your numbers make it worth it, and getting the mechanics exactly right, because there are no do-overs. If you’re staring at a pile of employer stock and you’re not sure which lane it should go down, that’s exactly the kind of thing a quick, no-pressure Retirement Analysis is built to sort out — a clear look before anyone touches anything.
This article is for educational purposes only and is not tax, legal, or financial advice. NUA rules are complex and irrevocable; consult a qualified tax professional about your specific situation. Sources: IRS Publication 575 and Kitces.com on IRC Section 402(e)(4).
About the author
Matt Selph helps pre-retirees build tax-efficient, protected retirement income. He’s the founder of Straight Answer Wealth Group and the creator of the Alignment Analyzer™. Connect with Matt on LinkedIn.
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