Net Unrealized Appreciation (NUA): When Company Stock Changes the Rollover Math

Most people assume rolling an old 401(k) into an IRA is always the right move. For employees who accumulated heavily appreciated employer stock inside their plan, that assumption can be expensive. Net unrealized appreciation, or NUA, is an IRS rule that lets you take company stock out of a 401(k) in-kind, pay ordinary income tax only on the original cost basis, and defer the rest until you sell, at long-term capital gains rates regardless of how long you hold the stock after distribution.

How the NUA Mechanic Works

When you take a lump-sum distribution from a 401(k), the IRS allows you to transfer employer stock directly to a taxable brokerage account instead of rolling it into an IRA. The amount you owe ordinary income tax on is not the current market value of those shares. It is the plan's cost basis, the amount the plan originally paid for the shares on your behalf, sometimes called the "plan cost basis" or "employer cost basis."

Everything above that basis is the net unrealized appreciation. You do not pay tax on that appreciation at distribution. When you eventually sell the shares, the NUA is taxed as long-term capital gains, currently capped at 20 percent for most high earners (plus the 3.8 percent net investment income tax if applicable). Any additional appreciation that occurs after the distribution is taxed at the standard short- or long-term rate depending on your holding period from the distribution date.

The remaining 401(k) assets, meaning the non-company-stock portion, can roll into an IRA in the same transaction without triggering any tax.

Rules, Requirements, and the Things That Break the Strategy

The IRS does not offer NUA treatment to anyone who simply wants out of their 401(k). Three conditions must be satisfied.

First, the triggering event. You must qualify based on one of four events: reaching age 59½, separating from service, disability, or death. Most pre-retirees rely on separation from service or turning 59½.

Second, the lump-sum distribution requirement. The entire vested account balance must be distributed within a single tax year. This is where most people unknowingly destroy their eligibility. If you rolled any portion of this same plan to an IRA in a prior year, the IRS treats that as a partial distribution and you lose lump-sum treatment for the year you try to use NUA. Even a small prior rollover from the same plan breaks it. The rule is plan-specific, so a rollover from a different former employer's plan does not disqualify you.

Third, the stock must be employer stock. Options and other equity compensation generally do not qualify. The shares must be the stock of the employer who sponsored the plan, distributed in-kind to a taxable account.

Documentation matters more than most people expect. You will need the 1099-R from the plan, and box 6 on that form should show the NUA amount. Your plan administrator must calculate and report the cost basis. Get this in writing before you initiate the distribution. Some plan administrators are slow to produce it or calculate it incorrectly.

One more watchout: the cost basis amount is subject to ordinary income tax in the year of distribution. If your basis is large relative to your income, this can push you into a higher bracket temporarily. You should model the tax hit in the year of distribution, not just the long-term savings.

Worked Example: $300,000 Position, $50,000 Basis

Say you are 62, recently retired, and your 401(k) holds $300,000 in company stock. The plan's cost basis on those shares is $50,000. The other $250,000 in the account is in mutual funds.

Under a standard rollover, all $300,000 of stock and $250,000 of other assets move to an IRA. No tax now, but every future withdrawal is ordinary income.

Under the NUA strategy, you distribute the $300,000 of stock in-kind to a taxable account and roll the $250,000 in mutual funds to an IRA. In the year of distribution, you owe ordinary income tax on $50,000 (the cost basis). If your marginal rate is 22 percent, that is $11,000 due immediately.

When you later sell the stock at $300,000, you owe long-term capital gains tax on the $250,000 of NUA. At a 15 percent rate, that is $37,500. Total tax on the stock: $48,500.

Compare that to rolling the stock into the IRA and later withdrawing $300,000 as ordinary income at 22 percent: $66,000. The NUA route saves roughly $17,500 in this scenario, and the gap widens if you are in a higher ordinary income bracket or if the stock continues to appreciate modestly before you sell.

The strategy works best when the ratio of NUA to cost basis is high, meaning the stock has appreciated dramatically relative to what the plan paid for it. It works less well when the basis is close to the current value, or when you expect to be in a low ordinary income bracket in retirement anyway.

How This Connects to the 401(k) Rollover Guide

NUA is one of the less-discussed options in the rollover decision, but it can be the most impactful one for the right person. The broader context, including the four main options for an old 401(k), the rules around direct versus indirect rollovers, and the most common mistakes people make, is covered in the parent guide: 401(k) Rollover: A Complete Guide to Moving an Old Retirement Account. If you have not read that piece, start there before deciding whether NUA applies to your situation.

Frequently Asked Questions

Does the NUA strategy work if I already rolled part of this plan to an IRA last year?

No. Any prior rollover from the same plan in a prior tax year typically disqualifies the current-year distribution from lump-sum treatment. The entire vested balance must be distributed in one tax year with no prior partial distributions from that plan.

What happens to dividends paid on the stock after I move it to the taxable account?

Dividends paid after the distribution date are taxed as ordinary or qualified dividends in the year received, the same as any other taxable account. The NUA rule only governs the appreciation that existed inside the plan at the time of distribution.

Can I use NUA if I am still employed?

Generally no, unless you have reached age 59½. Separation from service is the most common trigger, and most plans do not allow in-service distributions of employer stock to a taxable account before that age.

What if the stock drops in value after the distribution?

You locked in ordinary income tax on the basis at distribution. If the stock falls, the NUA you eventually recognize shrinks. In a severe drop, you could end up in a worse position than a straight rollover. This is a real risk and a reason why diversifying promptly after distribution is worth discussing with an advisor.

Does the 10 percent early withdrawal penalty apply?

The penalty applies to any amount included in gross income at distribution, which is the cost basis portion if you are under 59½ and do not qualify for another exception. One of the four qualifying events (age 59½, separation from service at age 55 or older, disability, or death) generally avoids the penalty, but confirm your specific trigger against the exceptions in IRC Section 402(e)(4).

Do I need to report the NUA on my tax return in the year of distribution?

You report the cost basis as ordinary income in the year of distribution via the 1099-R. The NUA amount in box 6 is not taxed until you sell the stock. Keep the 1099-R permanently; you will need it to establish your basis and the NUA amount when you eventually sell.

What to Do Next

1. Pull your 401(k) statement and ask your plan administrator for the cost basis on your employer stock holdings. Compare that figure to the current market value to estimate your potential NUA.
2. Model the year-of-distribution tax hit on the cost basis against your expected income for that year, factoring in any other retirement income sources.
3. Confirm with the plan administrator that no prior partial rollover from this plan has occurred, and request written documentation of the NUA amount and the basis before initiating any distribution.
4. Review the decision in the context of your full rollover plan by reading 401(k) Rollover: A Complete Guide to Moving an Old Retirement Account, then work through the numbers with a tax professional or fee-only financial advisor before you act.

The information provided is for educational purposes only and does not constitute investment, legal, or tax advice. Tax law changes frequently — verify current rules before acting. Consult with qualified professionals for guidance specific to your situation.