Net Unrealized Appreciation (NUA) Tax Treatment

The net unrealized appreciation (NUA) strategy is a specialized tax rule allowing you to take company stock out of your 401(k) while paying ordinary income tax on only the cost basis—the price the plan originally paid—and later selling the appreciated shares at long-term capital gains rates. It is one of the few ways to extract large gains from a retirement account at favorable tax rates.

How NUA creates a tax advantage

Suppose you retire with $1 million in your 401(k), of which $400,000 is company stock. The stock has a cost basis of $100,000—the price your plan paid for it. The net unrealized appreciation is $300,000 (current value minus cost basis).

Under normal rules, if you roll the stock into a traditional IRA and later sell it, the entire $400,000 distribution is taxed as ordinary income. But under the NUA rule, you can instead take a direct distribution of the stock, pay ordinary income tax on only the $100,000 basis, and leave the $300,000 appreciation to be taxed later at long-term capital gains rates.

If you are in the 24% ordinary income bracket, the NUA distribution costs $24,000 in federal tax. Later selling the stock at $400,000 and paying 15% long-term capital gains tax on the $300,000 gain costs $45,000. Total: $69,000.

Compare this to the IRA-rollover path: $400,000 × 24% = $96,000 in ordinary income tax. NUA saves $27,000 in this scenario, and the gap widens for those in higher brackets or in states with income tax.

The qualifying distribution rule

NUA applies only when you separate from service (retirement, termination, or other qualifying separation). You cannot claim NUA if you roll the entire 401(k) balance into an IRA. The IRS requires you to take a “qualifying distribution” directly from the plan—either a lump-sum distribution of the entire account balance or, in some plans, a direct distribution of the employer stock alone.

A qualifying distribution typically happens when you leave your job, reach age 55 (for those who separate from service at 55), or meet your plan’s distribution rules. The distribution must occur in a single calendar year or be part of a series of substantially equal distributions over your lifetime or life expectancy (a rare path).

Most commonly, workers take the entire 401(k) balance in the year they retire or are terminated. If the plan allows, they can take employer stock as a direct distribution and roll the remaining balance (cash and other securities) into a rollover IRA.

Why rolling to an IRA destroys the NUA benefit

This is the most common mistake. You receive a direct distribution of employer stock and cash from your 401(k). You think, “I’ll roll the cash to an IRA for simplicity,” but you forget to keep the stock separate.

Once any portion of a 401(k) distribution is rolled to an IRA, the NUA treatment is lost. The IRS treats the employer stock as if it were rolled into the IRA (even if it was not), and the full value becomes ordinary income when withdrawn later. The $300,000 appreciation is no longer eligible for long-term capital gains rates.

The correct path: take the employer stock as a direct distribution (do not roll it), and roll only the remaining balance to an IRA. Keep the stock in a taxable brokerage account, separate from any IRA or 401(k).

The one-year holding period after distribution

For the appreciation to qualify for long-term capital gains rates, you must hold the distributed stock for at least one year after the distribution date. If you receive the stock on December 15 and sell it on December 10 of the next year, the sale fails the one-year holding period, and the entire gain (or a large portion of it) is taxed as short-term gain, at ordinary income rates.

This holding period is separate from any holding period you had before the distribution. Once you own the stock outside the 401(k), a new one-year clock starts. Conversely, any holding period inside the 401(k) does not carry forward.

For an employee who has held company stock in a 401(k) for decades, this one-year holding requirement can be a surprise. The point is that long-term capital gains treatment applies only to gains realized after the distribution, not to gains inside the 401(k).

Calculating NUA step-by-step

1. Determine the cost basis of the employer stock in the 401(k) (what the plan paid for it).
2. Determine the fair market value of the stock on the distribution date.
3. Calculate NUA = fair market value minus cost basis.
4. Take a direct distribution of the stock (not a rollover).
5. Pay ordinary income tax on the cost basis in the year of distribution.
6. Hold the stock for at least one year.
7. Sell the stock and pay long-term capital gains tax on the NUA (the appreciation).

Example: Stock has a cost basis of $50,000 and fair market value of $250,000 on distribution date. NUA is $200,000. Year of distribution: pay ordinary income tax on $50,000. Upon sale a year later (at any price): if the stock has grown to $300,000, you have a $50,000 gain ($300,000 − $250,000) that is taxed as long-term capital gain. The original $200,000 NUA is taxed at long-term rates because it was recognized at distribution.

Coordination with other tax rules

NUA can interact with the Medicare net investment income tax (3.8% surtax on investment gains for high-income earners). The sale of highly appreciated NUA stock can push investment income over the threshold, triggering the surtax. This is still often more favorable than ordinary income tax rates, but it should be modeled.

NUA distributions may also trigger estimated quarterly tax payments. A large distribution in one quarter can push estimated tax up, and paying late or skipping a quarter triggers penalties.

Those who are still working for the company should consider that the employer might repurchase the stock, which can affect valuation and timing decisions.

Who benefits from NUA

NUA is most valuable for:

• Employees with significant company stock appreciation (appreciation > cost basis by many multiples).
• Those separating from service at or near retirement, when other income is low and long-term capital gains rates are favorable.
• High-income earners in high tax brackets, where the savings on ordinary income rates is substantial.

For employees with modest or underwater company stock holdings, NUA offers little benefit. And for those who cannot hold the stock for one year after distribution (perhaps due to a blackout window or personal financial need), the advantage shrinks.

See also