Net unrealized appreciation (NUA) is a tax break that lets you pay long-term capital gains rates — instead of ordinary income tax — on appreciated company stock held inside your 401(k). Instead of rolling that stock into an IRA, you distribute it in-kind to a taxable brokerage account, pay ordinary income tax only on your original cost basis, and defer the appreciation until you sell it at capital gains rates of 0%, 15%, or 20%. For someone holding low-basis employer stock that has grown for decades, this one move can cut the tax bill on that stock by tens of thousands of dollars — but a single wrong step, like an IRA rollover, destroys the benefit permanently.
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What is net unrealized appreciation, exactly?
NUA is the difference between what your company stock cost when it went into your 401(k) (the cost basis) and what it is worth today. The IRS lets you separate these two numbers and tax them differently — but only if the stock is inside an employer retirement plan and you follow a specific set of steps.
Here is the mechanics in plain terms. Say you worked at a company for 30 years and accumulated shares of its stock in your 401(k). Those shares cost $100,000 to acquire over the years, and today they are worth $500,000. The $400,000 of growth is your net unrealized appreciation.
- The cost basis ($100,000) is taxed as ordinary income in the year you distribute the stock.
- The NUA ($400,000) is not taxed at distribution. It is taxed at long-term capital gains rates whenever you eventually sell the shares — automatically, regardless of how long you actually held them.
That automatic long-term treatment is the whole point. Normally, everything that comes out of a 401(k) or IRA is taxed as ordinary income — the highest rate the tax code applies. NUA carves out the appreciation on company stock and moves it to the capital gains schedule, where the top federal rate is 20% instead of 37%.
How much can NUA actually save you?
The savings depend entirely on the gap between your basis and the current value. Using the $500,000 example above, here is how the two paths compare for a household in the 32% federal bracket paying 15% on long-term gains.
| Approach | Tax on basis ($100k) | Tax on gain ($400k) | Total federal tax |
|---|---|---|---|
| Roll stock into an IRA, withdraw later | Taxed as ordinary income | Taxed as ordinary income | $500,000 × 32% = $160,000 |
| Use NUA (distribute in-kind) | $100,000 × 32% = $32,000 | $400,000 × 15% = $60,000 | $92,000 |
In this case, NUA saves roughly $68,000 in federal tax on the same block of stock. High earners should also factor in the 3.8% net investment income tax, which can apply to the capital gains portion above $200,000 (single) or $250,000 (married filing jointly) of modified adjusted gross income — but even at 18.8%, the gain is taxed far more gently than ordinary income at 32% or 37%.
The rule of thumb I use with clients: NUA usually wins when the cost basis is a small fraction of the current value — roughly a quarter or less. If your basis is high relative to the stock’s value (say, you bought in recently and it hasn’t grown much), the ordinary-income hit on the basis can outweigh the capital gains savings, and a plain IRA rollover is often the better call.
Who qualifies for the NUA tax break?
Three conditions have to line up. Miss any one and NUA is off the table.
- You hold actual employer stock inside an employer plan. This is a 401(k), ESOP, or similar qualified plan holding shares of the company you worked for. Mutual funds and target-date funds don’t count — it has to be individual company shares.
- A triggering event has occurred. NUA is only available after one of four events: separation from service (you leave the employer), reaching age 59½, total disability, or death. Most people use it when they retire or change jobs.
- You take a qualifying lump-sum distribution. The entire vested balance of the plan must be distributed within a single calendar year. You move the company stock in-kind to a taxable brokerage account, and the rest of the plan (bonds, funds, other holdings) can be rolled into an IRA in that same year.
One more wrinkle worth knowing: if you take the distribution before age 59½, the ordinary income tax on the cost basis may also trigger the 10% early withdrawal penalty — but only on the basis, not the appreciation. That is one reason many people wait until they have both left the company and crossed 59½ before pulling the trigger.
What mistakes disqualify NUA?
The single most common and most expensive mistake is rolling the company stock into an IRA. Once appreciated shares land in an IRA, the NUA opportunity is gone forever — every dollar that later comes out is taxed as ordinary income. I have seen retirees lose a five-figure tax break because a well-meaning custodian or advisor swept the whole 401(k) into a rollover IRA without asking about company stock.
Other traps that quietly disqualify the strategy:
- Failing to empty the account in one tax year. The distribution has to be a complete lump sum. Leaving a balance behind, or spreading it across two years, breaks the qualifying-distribution requirement.
- Taking a partial distribution after the triggering event. If you pull money out of the plan after your triggering event but before doing the full NUA distribution, you can reset the clock and lose eligibility until the next triggering event.
- Selling the stock inside the plan first. The shares must move out in-kind. Once they’re sold within the 401(k), there is no stock to distribute and no NUA.
Because the sequence matters so much, this is a decision to make deliberately — before you sign a single rollover form — not after the fact.
Does NUA help Massachusetts residents at the state level?
Here’s the honest answer: not much, at the state level. Massachusetts taxes long-term capital gains at 5% — the same flat rate it applies to ordinary income. So the federal trick of shifting income from the ordinary schedule to the capital gains schedule doesn’t produce state savings the way it does federally. Your NUA is still worth pursuing, but the entire benefit comes from the federal side.
There is a Massachusetts risk to watch, though. The lump-sum distribution puts your cost basis on the table as ordinary income in a single year. If that basis is large, it can stack on top of your other income and push you over the state’s 4% surtax threshold — the so-called Massachusetts millionaires tax on income above $1,083,150. For most retirees the basis is modest and this is a non-issue, but for executives with large stock positions and high basis, the timing of the distribution deserves a careful look.
How does NUA fit with the rest of a retirement tax plan?
NUA is one lever, and it works best when it’s coordinated with everything else happening in your tax return. The year you recognize the basis as ordinary income is often not the year you want to do a large Roth conversion, because both add to the same income stack. If you’re weighing both moves, it’s worth reading how Roth conversions work in retirement so you can sequence them across separate years rather than colliding them in one.
This is exactly the kind of decision where a disciplined approach to your portfolio and your tax return need to talk to each other. At Evergreen Wealth Management, I help clients model the NUA-versus-rollover choice with their actual basis numbers before anyone touches a distribution form — because it’s a one-shot decision, and there’s no undo button.
How we charge for this kind of planning
Most financial advisors charge a percentage of the assets they manage — commonly around 1% a year. On a $2 million portfolio, that’s roughly $20,000 every year, and it quietly grows as your investments grow. A decision like NUA, which happens once, ends up bundled into a fee that never stops.
Evergreen works differently. We are a flat-fee, fee-only fiduciary firm: clients pay a flat monthly fee, regardless of whether their portfolio is $1 million or $5 million. You get the same NUA analysis, the same withdrawal planning, and the same fiduciary advice — without a bill that balloons as your assets grow. You can see exactly how that works on our fee structure page.
NUA is usually one move inside a larger problem: too much of your net worth sitting in a single company’s stock. If that describes you, what happens after the distribution matters as much as the election itself — I’ve written a companion piece on how to diversify a concentrated stock position that walks through the year-by-year tax math of unwinding a large, low-basis holding.
Frequently Asked Questions
Do I have to sell the company stock right away after using NUA?
No. Once the shares are in your taxable brokerage account, you can hold them as long as you like. The NUA portion keeps its guaranteed long-term capital gains treatment whenever you sell. Any additional growth after the distribution is taxed as a normal capital gain — long-term if you hold the shares more than a year past the distribution date, short-term if not.
What happens to NUA shares when I die?
The NUA portion does not receive a step-up in basis at death — your heirs still owe capital gains tax on that appreciation when they sell. However, any growth above the NUA amount that occurred after the distribution generally does get a step-up. This makes the timing and estate side of the decision worth planning carefully, especially for larger positions.
Is NUA worth it if my company stock hasn’t appreciated much?
Usually not. NUA shines when the appreciation is large relative to the basis. If your basis is a big share of the stock’s value, you’ll pay a lot of ordinary income tax up front for a small capital gains benefit, and a straightforward IRA rollover is often better. Running the actual numbers is the only way to know.
Does Evergreen help with the NUA decision?
Yes. As a flat-fee fiduciary firm in Boston, we model the NUA-versus-rollover choice using your real cost basis, tax bracket, and retirement timeline — for the same a flat monthly fee flat fee we charge for all of our planning work. Because NUA is a one-time, irreversible decision, we look at it before any distribution paperwork is filed.
The bottom line
If you’re retiring or leaving a job with appreciated company stock in your 401(k), NUA is one of the most valuable and most easily missed tax breaks available to you. The savings can run into the tens of thousands, but only if the stock never touches an IRA and the distribution is done correctly in a single year. If you’d like help running your own numbers before you make an irreversible move, here’s how to get started as a client.
Nick Stevens, CFP® is the founder of Evergreen Wealth Management in Boston, a flat-fee financial planning and investment management firm. Evergreen charges a fixed monthly fee regardless of portfolio size. Learn more about how we work at our fee structure page or get in touch at our contact page.