Company Stock in a 401(k) Gets a Special Tax Break. One Standard Rollover Erases It Forever.
A single checkbox on a retirement rollover form can quietly erase a tax break worth tens of thousands of dollars, and most workers sign it without knowing the break existed in the first place.
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Millions of workers hold shares of their employer’s stock inside their 401(k). When those shares appreciate over a career, the IRS offers a rarely used tax break called Net Unrealized Appreciation, or NUA. It lets an employee pay ordinary income tax on the original cost of the shares and long-term capital gains rates on the growth. The problem: rolling that 401(k) into an IRA the standard way permanently destroys the benefit. Once the shares leave the plan and move into an IRA, every future dollar comes out as ordinary income at withdrawal.
In recent quarters, the context has shifted. The personal savings rate fell to 2.8% in the second quarter of 2026, down from 5.0% a year earlier. Households are keeping less of what they earn, so preserving the tax-advantaged wealth already accumulated in workplace plans carries more weight than it did during those higher-savings periods.
How the NUA Break Actually Works
NUA applies only to employer stock held inside an employer’s qualified plan. When the participant separates from service through retirement, a job change, disability, or death, they can take an in-kind distribution of the shares into a regular taxable brokerage account. Ordinary income tax is due on the cost basis, which is what the plan originally paid for the shares. The appreciation above that basis, the net unrealized appreciation, qualifies for long-term capital gains rates whenever the shares are eventually sold, regardless of the holding period at the time of distribution.
Long-term capital gains rates in 2026 top out at 20% for the highest earners, with most middle-income households falling in the 15% bracket and some qualifying for 0%. Ordinary income rates run up to 37%. On a large block of appreciated employer stock, the difference is not marginal.
Simple Math in a Realistic Situation
Take a worker with $300,000 of company stock in a 401(k) and a cost basis of $60,000. Under the NUA rules, that $60,000 basis gets taxed as ordinary income in the year of the distribution, while the $240,000 of appreciation waits until the shares are actually sold and gets taxed at long-term capital gains rates. If that worker falls into the 15% capital gains bracket, the tax bill on the appreciation comes to $36,000 when those shares are eventually sold.
Roll the same $300,000 into a traditional IRA instead. Nothing is taxed at rollover. Every dollar withdrawn later, basis and appreciation alike, becomes ordinary income. In a 24% federal bracket, the full $300,000 would generate $72,000 in federal tax over time, plus state tax where applicable. The favorable capital gains treatment disappears the moment the shares land in the IRA.
Why This Matters for Typical Earners
Median usual weekly earnings for full-time workers reached $1,251 in the second quarter of 2026, up from $1,143 in the second quarter of 2024. Company stock plans, particularly at large employers with employee stock purchase programs or share matching, can build meaningful positions relative to that income. A worker earning near the median who accumulates six figures in employer stock over 20 or 30 years is a realistic profile.
Interest rates add further context to the calculus. The 10-year Treasury yield sits at 4.68%, near the top of its 12-month range and well above the 4.3% average over the past year. Every dollar paid unnecessarily to the IRS is a dollar not compounding at current yields.
The Rollover Trap
At retirement, plan participants often receive rollover paperwork that treats the entire 401(k) as a single asset, and signing the standard form moves everything, including the employer stock, straight into an IRA. The NUA election, however, requires a lump-sum distribution of the entire plan balance in a single tax year, with the employer stock moved in kind to a taxable brokerage account and the remaining assets rolled into an IRA separately. Missing that split, or doing partial distributions across multiple years, disqualifies the NUA treatment entirely.
What to Confirm Before Rolling Anything Over
Three items decide whether NUA is worth pursuing:
- The cost basis of the employer stock inside the plan. Plan administrators track this figure, and it determines the strategy’s immediate tax cost.
- The size of the appreciation relative to the basis. NUA works best when appreciation is large compared to basis; a low ratio makes the ordinary income tax on basis less attractive.
- The qualifying triggering event. NUA requires separation from service, reaching age 59½, disability, or death, along with a lump-sum distribution completed in one tax year.
The tax code rewards employees who hold appreciated company stock inside a workplace plan. That reward disappears with one wrong signature on a rollover form.
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David Beren has been a Flywheel Publishing contributor since 2022. Writing for 24/7 Wall St. since 2023, David loves to write about topics of all shapes and sizes. As a technology expert, David focuses heavily on consumer electronics brands, automobiles, and general technology. He has previously written for LifeWire, formerly About.com. As a part-time freelance writer, David’s “day job” has been working on and leading social media for multiple Fortune 100 brands. David loves the flexibility of this field and its ability to reach customers exactly where they like to spend their time. Additionally, David previously published his own blog, TmoNews.com, which reached 3 million readers in its first year. In addition to freelance and social media work, David loves to spend time with his family and children and relive the glory days of video game consoles by playing any retro game console he can get his hands on.
