Net Unrealized Appreciation: Company Stock in a 401(k)
Updated ·5 min read·Reviewed by the StockTools.ai Research Team
- ▸Net unrealized appreciation applies only to employer securities held inside an employer retirement plan, and it is forfeited the moment those shares are rolled into an IRA.
- ▸The election taxes your cost basis as ordinary income now, and the appreciation at long-term capital gains rates when you eventually sell, regardless of how long you hold afterward.
- ▸It requires a lump-sum distribution of the entire plan balance within one tax year, following a triggering event such as separation from service, reaching 59 and a half, disability or death.
- ▸The strategy is worth most when the cost basis is low relative to current value, and close to worthless when the stock was bought near today’s price.
- ▸It is easy to void by accident, and the mistake is usually irreversible, which is why this is one of the few retirement decisions that genuinely requires a professional before execution.
The default outcome, and why it is expensive
Money leaving a 401(k) is ordinary income. That is fine for the fund holdings, because they were never going to receive capital gains treatment anyway. It is expensive for employer stock that has appreciated substantially, because the entire gain gets taxed at ordinary rates instead of the long-term capital gains rates it would have received in a taxable account.
Net unrealized appreciation is the exception Congress wrote for exactly this case. NUA is the difference between what the plan paid for the employer shares, the cost basis, and what they are worth when distributed. Elect the treatment and you split the tax: the cost basis is ordinary income in the year of distribution, and the appreciation is long-term capital gain whenever you sell, at 0%, 15% or 20%.
One detail makes the election unusually attractive: the NUA portion is long-term by statute regardless of how long the shares were held inside the plan or how quickly you sell after distribution. You can distribute the shares on Monday and sell them on Tuesday, and the appreciation still receives long-term treatment.
Worked both ways
Take an employee retiring with $500,000 of employer stock in the 401(k), acquired over decades at a cost basis of $75,000. Their other plan assets total $400,000. Assume a 32% marginal ordinary rate and a 15% long-term rate.
Roll everything to an IRA, the default, and nothing is taxed today. Withdrawals later are all ordinary income, so the $500,000 position, if it holds its value, produces about $160,000 of federal tax at 32% as it comes out. Required minimum distributions eventually force the timing.
Use NUA instead. The stock is distributed in kind to a taxable brokerage account and the other $400,000 rolls to an IRA. You pay ordinary tax now on the $75,000 basis, which is $24,000. The $425,000 of appreciation is taxed at 15% when you sell, which is $63,750. Total tax of about $87,750 against roughly $160,000, a difference near $72,000 on one decision. The gap widens with a lower basis and narrows as the basis approaches current value.
The rules that void it
Two conditions govern eligibility, and both are unforgiving. First, a triggering event: separation from service, reaching age 59 and a half, total disability, or death. Second, a lump-sum distribution, meaning the entire balance of the plan is distributed within a single tax year, with the employer securities transferred in kind rather than sold.
The word entire is the trap. Taking a partial distribution in one year and the rest in the next disqualifies the lump-sum treatment. So does taking any distribution after a triggering event and before the lump sum, which can quietly reset eligibility to the next triggering event. So does rolling the shares into an IRA first and trying to undo it, because once employer stock is inside an IRA the NUA character is gone permanently and there is no correction procedure.
The most common way people lose this is the most ordinary: a retiring employee tells the plan administrator to roll everything over, because that is the standard advice for a 401(k), and the opportunity disappears in a single phone call. Anyone with appreciated employer stock in a plan should establish the cost basis and evaluate NUA before initiating any rollover, not after.
When it is not worth it
A high cost basis kills the strategy. If the plan paid $400,000 for stock now worth $500,000, you would pay ordinary tax on $400,000 today to shelter $100,000 of appreciation, which is worse than doing nothing. The rough screen practitioners use is whether the basis is under roughly a quarter to a third of current value, though the honest answer depends on your bracket now, your bracket later, and how long the money would otherwise stay tax-deferred.
Age and time horizon matter in both directions. Continued deferral inside an IRA is valuable when retirement is decades away, since untaxed compounding can outweigh the rate difference. Someone at 60 facing required minimum distributions has far less deferral left to protect, which is why NUA is usually evaluated at separation or retirement rather than mid-career.
Two further considerations. The distribution can be a large one-year income event that may affect Medicare premium surcharges and other income-tested items, so the year it lands in matters. And executing NUA leaves you holding a concentrated position in your former employer in a taxable account, which is the concentration problem all over again. The tax-efficient move and the risk-appropriate move can point in opposite directions, and selling promptly after distribution is usually how that gets resolved, since the NUA rate applies regardless.
Doing it in the right order
Start with the cost basis, which the plan administrator holds and will provide on request. Without that figure none of the arithmetic above can be run, and it is the single input that determines whether the strategy is worth pursuing at all.
If the numbers look favourable, the sequence is specific: confirm a triggering event has occurred, instruct the administrator to distribute the employer securities in kind to a taxable brokerage account, roll the remaining plan assets to an IRA, and complete the entire distribution within one calendar year. The plan will report the basis on Form 1099-R, and the NUA amount appears in its own box on that form.
Then get it reviewed before anything moves. The election is irreversible, the qualifying conditions are technical, and the sums involved are typically the largest in a household’s financial life. A CPA or a fee-only advisor with specific NUA experience costs a fraction of the tax at stake, and this is one of the clearest cases in personal finance where the professional fee is obviously worth paying.
FAQ
What is net unrealized appreciation?
The difference between what your retirement plan paid for employer securities and what those shares are worth when distributed. Under the NUA election the cost basis is taxed as ordinary income at distribution and the appreciation at long-term capital gains rates when sold.
What are the requirements to use NUA?
A triggering event, meaning separation from service, age 59 and a half, disability or death, plus a lump-sum distribution of the entire plan balance within one tax year, with the employer securities distributed in kind rather than sold.
Can I use NUA if I already rolled the stock into an IRA?
No. Once employer securities are inside an IRA the NUA character is permanently lost, and there is no correction procedure. This is the most common and most expensive way the opportunity is destroyed.
Do I have to hold the shares for a year after distribution?
No. The NUA portion receives long-term capital gains treatment by statute regardless of holding period, so shares distributed one day and sold the next still qualify. Appreciation occurring after the distribution follows normal holding-period rules.
When is NUA not worth doing?
When the cost basis is high relative to current value, because you would pay ordinary tax on a large basis to shelter a small gain. A common screen is whether the basis is under roughly a quarter to a third of the current value.
Does NUA apply to stock I bought myself in a brokerage account?
No. It applies only to employer securities held inside an employer-sponsored retirement plan such as a 401(k) or ESOP. Shares purchased in a taxable account already receive capital gains treatment.
Put it to work
Related guides
Sources & further reading
- ▸ IRC Section 402(e)(4), net unrealized appreciation in employer securities
- ▸ IRS Publication 575, Pension and Annuity Income
- ▸ IRS Form 1099-R instructions, distribution reporting
More to learn
Educational only — not financial advice. Concepts simplified for clarity; markets are messier than definitions.