Net Unrealized Appreciation (NUA): The 401(k) Tax Break Executives Miss

If a meaningful chunk of your 401(k) is sitting in your own company’s stock, the standard advice — “roll it all into an IRA” — may not be the most tax-efficient move available. A lesser-known rule called net unrealized appreciation, or NUA, lets you separate that employer stock out of a lump-sum 401(k) distribution and have the built-in gain taxed at long-term capital gains rates instead of ordinary income rates. It is not a shortcut, and it does not fit every situation, but for the right person it can change the tax math on a retirement decision that only comes around once.

Net unrealized appreciation is the difference between what you originally paid for employer stock inside your 401(k) (your cost basis) and what that stock is worth on the day it’s distributed to you. Under the rule described in IRS Publication 575, if you take your 401(k) as a qualifying lump-sum distribution and receive the employer stock in kind rather than rolling it into an IRA, only your original cost basis is taxed as ordinary income in the year of distribution. The appreciation — the NUA — isn’t taxed until you sell the shares, and when you do, it’s taxed at long-term capital gains rates no matter how long the plan actually held the stock.

In plain terms: NUA lets you move appreciated employer stock out of a 401(k) into a taxable brokerage account so that only your original cost basis is taxed as ordinary income at distribution, while the appreciation is taxed later, at sale, at long-term capital gains rates. Strict eligibility rules apply, and it is not the right move for everyone.

What Is Net Unrealized Appreciation (NUA)?

NUA is the appreciation built up on employer securities — typically company stock — held inside a qualified retirement plan such as a 401(k), profit-sharing plan, or ESOP. IRS Notice 98-24 confirms that when NUA shares are later sold, the appreciation “is considered a gain from the sale or exchange of a capital asset held for more than [the long-term holding period],” regardless of how long the plan itself held the stock. That single sentence is the strategy: a permanent recharacterization of ordinary income into long-term capital gain, available only through a specific distribution mechanic.

Who Is Eligible to Use the NUA Strategy?

NUA is only available when a distribution qualifies as a “lump-sum distribution” under IRS rules — a narrow legal definition, not a casual description of a large withdrawal. Per IRS Publication 575, a lump-sum distribution is the payment of a plan participant’s entire balance from all of an employer’s qualified plans of one kind, within a single tax year, triggered by one of four events:

• The participant’s death
• The participant reaching age 59½
• The participant, if an employee, separating from service
• The participant, if self-employed, becoming totally and permanently disabled

If a distribution spans more than one tax year, or only part of the balance is withdrawn, NUA treatment is generally lost. The mechanics described here apply to stock from a 401(k), profit-sharing plan, or ESOP alike, though S-corporation ESOP shares carry added basis-adjustment complexity.

How the NUA Distribution Actually Works

Executing an NUA distribution means directing the plan to distribute the employer stock in kind — shares, not cash — into a taxable brokerage account, while any remaining balance can still roll into an IRA in the same transaction. The custodian reports the NUA amount in box 6 of Form 1099-R for that tax year, and from that point on the shares sit in a taxable account.

How Is Net Unrealized Appreciation Taxed?

The tax treatment has two separate layers, and keeping them distinct is the whole point of the strategy:

1. Cost basis: Taxed as ordinary income in the year the shares are distributed, per IRS Publication 575.
2. Net unrealized appreciation: Not taxed at distribution. When the shares are eventually sold, the appreciation is taxed at long-term capital gains rates under IRS Notice 98-24 — even if sold the next day.

Ordinary income tax rates for 2026 run as high as 37% for single filers with taxable income over $640,600 (or $768,700 for married couples filing jointly), based on the IRS’s 2026 inflation-adjusted brackets. Long-term capital gains, by contrast, top out at 20% for single filers above $545,500 in taxable income (or $613,700 for joint filers) for 2026. That rate gap is the entire economic case for NUA — but it only applies to the appreciation, not the basis.

Two wrinkles matter. First, the IRS’s 10% additional tax on early distributions applies to “the portion of the distribution that’s includible in gross income” — for NUA, generally the cost-basis portion, if distribution happens before age 59½ with no other exception (such as separation from service at 55 or later). Second, once shares sit in a taxable account, future dividends and gains may also draw the 3.8% Net Investment Income Tax above $200,000 in modified adjusted gross income for single filers, or $250,000 for joint filers.

A hypothetical illustration. Assumptions: $100,000 cost basis, $500,000 current value ($400,000 of NUA), separation from service, immediate sale, 35% ordinary bracket, 20% long-term capital gains rate. Under NUA, the $100,000 basis is taxed as ordinary income (about $35,000), and the $400,000 of appreciation is taxed at 20% (about $80,000) — roughly $115,000 combined. Under a full IRA rollover, the same $500,000 is eventually taxed as ordinary income on withdrawal — at 35%, about $175,000. This is a simplified, hypothetical illustration only. It ignores state tax, the net investment income tax, and sale timing; it is not a projection or a typical result, and actual outcomes depend on an individual’s full tax situation and the rates in effect at distribution and sale.