Net Unrealized Appreciation Explained: When NUA Beats an IRA Rollover (and When It Doesn't)

The same block of stock can save you $12,000 or cost you $2,000 depending on one number: how much of its value is built-in appreciation versus original basis. Before anything else, find out your cost basis — your plan administrator is required to track it.

Most people who leave an employer roll their entire 401(k) into an IRA without a second thought. Usually that's the right call. But if a big chunk of your plan is highly appreciated company stock, an automatic rollover can quietly throw away a one-time tax break. Net Unrealized Appreciation is a provision in the tax code that lets you pay ordinary income tax on only the small piece you originally paid for the shares, and capital gains rates on everything they've grown to since.

How the mechanics work

In a qualifying lump-sum distribution, your employer stock is transferred in kind — as actual shares — into a regular taxable brokerage account, while the rest of your plan (other funds, and any company stock you don't elect for NUA) rolls into a traditional IRA. In the year of the distribution, you pay ordinary income tax on the cost basis of the shares that came out. The appreciation rides along untaxed until you sell, and when you do, it's taxed at the long-term capital gains rate no matter how briefly you held the shares after distribution.

Any growth that happens after the shares land in the brokerage account is taxed separately, as a short- or long-term capital gain depending on how long you hold from the distribution date forward. That post-distribution growth — unlike the original NUA — can also be subject to the 3.8% Net Investment Income Tax at higher incomes.

Three reasons NUA can pay off

Rate arbitrage on the appreciation. Inside a traditional IRA, every dollar of growth eventually comes out as ordinary income — potentially taxed at 22%, 24%, or higher. Under NUA, that same appreciation is taxed at long-term capital gains rates of 0%, 15%, or 20%. On a stock that has grown ten-fold, shifting the bulk of the gain from ordinary to capital-gains treatment is the whole ballgame.

Smaller future RMDs. Moving the stock out of the plan permanently removes it from your tax-deferred balance. Required Minimum Distributions are calculated only on what's left in the IRA, so a smaller IRA means smaller forced withdrawals starting at 73 — less mandatory ordinary income, and potentially lower Medicare IRMAA surcharges down the road.

Flexibility and control. The brokerage account has no RMD, so you decide when to sell. In a low-income year you might even sell a slice of NUA stock inside the 0% long-term capital gains bracket. You also gain the ability to harvest losses, gift shares, or donate appreciated stock to charity — none of which is possible inside an IRA.

The whole decision reduces to one comparison: the tax you pay under NUA — ordinary income on the basis now, capital gains on the appreciation later — versus the ordinary income tax you'd pay on the full value of the stock as it eventually leaves an IRA.

Two forces pull in opposite directions. The rate spread between ordinary income and capital gains favors NUA. But leaving money inside an IRA lets it keep compounding tax-deferred, and over a very long horizon that deferral can outrun the rate savings. This is why NUA is not simply "always better" — it's a balance of basis, rate spread, and time.

Margaret vs. Robert: two approaches

Two 60-year-olds retiring from the same company. Each has $1,000,000 in their 401(k): $400,000 of company stock with a $50,000 cost basis, plus $600,000 in ordinary funds. Same starting point, different decision.

On the company stock alone, Margaret's basis-plus-capital-gains path costs roughly $20,000–$25,000 less than Robert's all-ordinary path — before counting the compounding effect of her smaller RMDs. The gap widens the lower the basis goes and the wider her ordinary-to-capital-gains rate spread. If Robert's stock had a $300,000 basis instead of $50,000, the answer could flip entirely.

The cost-basis ratio is the headline number

A useful rule of thumb: the more appreciation as a share of total value, the stronger the case for NUA. Stock with a 10% basis (90% appreciation) is close to an automatic win. Stock with a 70–90% basis often isn't worth the complexity, because you'd be paying ordinary income tax now on a large basis just to save a modest amount of capital gains later. Somewhere in between is a break-even zone where growth assumptions and your time horizon decide it — exactly what a year-by-year model is for.

Partial elections and the lump-sum trap

You don't have to apply NUA to every share. A common approach is to elect NUA only on the lowest-basis lots — where the tax arbitrage is greatest — and roll the higher-basis shares into the IRA along with everything else. What you can't do is split the distribution across tax years or take an earlier partial distribution from the plan: the entire balance has to come out in one tax year for the lump-sum requirement to be met. Sequence and timing are everything here, and a single misstep can disqualify the strategy.

NUA isn't a yes-or-no decision so much as a set of conditions that have to line up. When several of them point the same way, the savings can be substantial. When they don't, a simple IRA rollover is cleaner, more diversified, and often cheaper.

The levers that matter

Cost basis. The single biggest driver. Low basis relative to value means most of your gain gets capital gains treatment. High basis means you pay ordinary tax now on a large amount for little benefit.

The rate spread. NUA only helps to the extent your ordinary income rate exceeds your long-term capital gains rate. A 37% ordinary earner facing a 20% gains rate has a wide spread to exploit; someone whose income already sits in the 12% bracket has almost none.

Time horizon. Here NUA runs opposite to a Roth conversion. A long deferral horizon actually favors keeping the stock in an IRA, because decades of tax-deferred compounding can outweigh the one-time rate arbitrage. NUA tends to look best when you expect to sell within a reasonable window rather than holding for 30 years.

Concentration risk. NUA rewards you for keeping a large position in a single stock. That's a real tension: the tax tail shouldn't wag the investment dog. If a meaningful share of your net worth would sit in one company's shares, the diversification cost may outweigh the tax savings.

State taxes. Some states give no preferential rate to long-term capital gains and tax them as ordinary income, which erases much of the federal advantage. In those states, NUA's benefit is mostly deferral rather than rate savings — worth modeling carefully.

When NUA doesn't make sense

Your stock has a high cost basis. If basis is most of the value, you'd pay ordinary tax now on a large sum to shelter a small gain. A rollover usually wins.

You'd be over-concentrated. If electing NUA means holding a risky, outsized single-stock position to preserve the tax treatment, the investment risk can dwarf the tax benefit.

You have a very long horizon and won't sell. Money you won't touch for decades may grow more, after tax, inside a tax-deferred IRA than as taxable stock — even at ordinary rates on the way out.

Your ordinary and capital gains rates are close. Without a meaningful rate spread, there's little to arbitrage, and the upfront ordinary tax on basis isn't worth it.

The estate planning reality (and a common myth)

You'll often hear that NUA stock gets a step-up in basis at death that wipes out the gain. That's only partly true, and the part that's false matters. Under Revenue Ruling 75-125, the original NUA is "income in respect of a decedent" — it does not get a step-up. Your heirs inherit your basis on that piece and owe long-term capital gains tax on the NUA whenever they sell, no matter how long they hold. What does step up is only the appreciation that occurred after the shares left the plan.

Example: stock distributed at $500,000 with a $100,000 basis carries $400,000 of NUA. If it's worth $750,000 at your death, your heir gets a stepped-up basis on the $250,000 of post-distribution growth — that portion is tax-free. But the $400,000 of original NUA stays taxable as a long-term capital gain when sold. By contrast, an inherited IRA gets no step-up at all and, under the SECURE Act, most non-spouse heirs must empty it within 10 years, paying ordinary income tax on every dollar. So NUA still has an estate edge — just a narrower one than the myth suggests.

Watch the year-of-distribution income spike

Recognizing the cost basis as ordinary income lands entirely in the distribution year. On low-basis stock that's a small bump, but on high-basis stock it can be a large one-time spike in your Modified Adjusted Gross Income. That spike can push you over a Medicare IRMAA threshold two years later (the first 2026 tier begins at $109,000 single / $218,000 married filing jointly, and the surcharge works like a cliff), and it can pull you above the $200,000 / $250,000 Net Investment Income Tax thresholds for that year — though the NUA gain itself is exempt from NIIT, your other investment income that year is not.

Whether NUA beats a rollover comes down to your specific numbers: your cost basis, the stock's current value, your tax rates now and in retirement, how fast you draw the money down, and how long you project forward. The calculator below compares both paths year by year and shows where they cross.

Quick Start Calculator

What to look for in the results

The break-even year tells you when the NUA path's cumulative after-tax wealth overtakes the full-IRA-rollover path. NUA starts behind because of the upfront ordinary tax on the basis; if break-even arrives within your horizon, the strategy pencils out. Compare the two net-wealth lines — NUA net wealth versus IRA net wealth — to see the gap widen or close over time, and watch the net advantage area dip below zero in the early years before (often) climbing above it. Finally, the estate snapshot estimates what heirs would receive under each path; just remember the real-world step-up nuance covered above when you read it.

This calculator provides estimates for educational purposes only. It uses simplified assumptions about tax rates, growth, drawdown, and future income that may not match your situation. NUA decisions are irreversible, hinge on meeting strict lump-sum distribution rules, and can affect Medicare premiums, the Net Investment Income Tax, estate outcomes, and your overall portfolio risk. Tax laws change. This tool reflects general principles, not guarantees under current law, and is not tax, legal, or investment advice — confirm your cost basis with your plan administrator and consult a qualified professional before acting.

Answers to the most common questions about how NUA works, who qualifies, and where it helps.