Short Answer
If your 401(k) holds heavily appreciated employer stock, the NUA strategy can beat a routine IRA rollover. You take the shares out in kind, pay ordinary income tax only on the cost basis now, and the appreciation (the NUA) is taxed at long-term capital gain rates when you sell. On $300,000 of stock with a $75,000 basis at 32 percent ordinary and 15 percent capital gains, NUA costs about $57,750 in tax versus roughly $96,000 if you roll the stock to an IRA and later draw it as ordinary income - a saving near $38,250. NUA wins when the appreciation is large relative to basis; a rollover wins when the basis is high and your horizon is long.
Key Takeaways
- NUA splits the tax. Ordinary income on the basis now; long-term capital gains on the appreciation at sale (IRC §402(e)(4)).
- The NUA is automatic long-term gain when you sell, no matter how long you held the shares after the distribution.
- It needs a lump-sum distribution - the entire account in one tax year, taken in kind, after a triggering event (separation, 59½, death, disability).
- The 10 percent penalty hits the basis only, not the NUA, and only if you are under 59½ with no exception.
- NUA is reported in box 6 of your Form 1099-R; the sale goes on Form 8949 and Schedule D.
- NUA wins on big appreciation; a rollover wins on a high basis and a long deferral horizon.
- High earners add 3.8 percent net investment income tax to the capital-gains side.
- It is irreversible once done - the shares are out of the plan, so get the basis and the lump-sum timing right.
NUA vs IRA Rollover at a Glance
The Two Paths Compared
| Feature | NUA Strategy (§402(e)(4)) | IRA Rollover |
|---|
| Tax at distribution | Ordinary tax on cost basis | None |
| Tax on the appreciation | Long-term capital gain at sale | Ordinary income when withdrawn |
| 10% penalty under 59½ | On the basis only | On the amount withdrawn early |
| Where the stock goes | Taxable brokerage account | Traditional IRA |
| Continued tax deferral | No (out of the plan) | Yes (whole balance) |
| Best when | Appreciation is large vs basis | Basis is high, horizon long |
| Reported on | 1099-R box 6, then Form 8949 / Sch D | 1099-R rollover, then ordinary |
NUA treatment comes from IRC §402(e)(4) and is explained in IRS Publication 575. It applies only to employer securities distributed in kind from a qualified plan. The appreciation that built up inside the plan keeps its character as capital gain; the basis is the price of admission, taxed as ordinary income now. Sources: IRC §402(e)(4), IRS Pub 575 (Distributions of employer securities), and the Form 1099-R instructions (box 6).
How the Calculation Works
The tool prices the same employer stock two ways - kept under the NUA strategy or rolled to an IRA - so you can see the real difference. For the full rules behind each path, see the Net Unrealized Appreciation Guide.
Step 1: Find the NUA Confirmed
The net unrealized appreciation is the current market value of the shares minus their cost basis in the plan. That is the slice of value that gets long-term capital gain treatment under IRC §402(e)(4). The tool computes it from the two amounts you enter.
Step 2: Tax the Basis as Ordinary Income Confirmed
Under the NUA strategy you pay ordinary income tax on the cost basis in the year of the lump-sum distribution. The tool multiplies the basis by your marginal rate. The NUA itself is not included in income at distribution, so it is not taxed yet.
Step 3: Apply the Penalty to the Basis Only Confirmed
If you are under age 59½, the 10 percent additional tax under IRC §72(t) applies, but only to the cost basis, the part included in income. The NUA is excluded from income, so it carries no penalty. The tool adds the penalty only when your age is under 59½.
Step 4: Tax the NUA at Capital Gain Rates Confirmed
When you sell the shares, the gain up to the NUA amount is automatically long-term capital gain, whatever your holding period. The tool taxes the NUA at your long-term capital gains rate, plus the 3.8 percent net investment income tax if you select it, and taxes any post-distribution growth the same way.
Step 5: Compare Against the IRA Rollover Confirmed
Rolling the stock to a traditional IRA defers all tax, but every dollar later comes out as ordinary income. The tool taxes the full value at your ordinary rate for the rollover path and subtracts the NUA total to show the tax saved. It does not model the IRA's tax-deferred compounding, which favors a rollover the longer your horizon, so treat the result as the rate comparison, not the whole decision.
Real-World Examples
Example 1 - $300,000 stock, $75,000 basis, age 60, 32% ordinary, 15% LTCG, sell now
NUA (taxed at capital gains)$225,000
NUA: ordinary tax on basis$24,000
NUA: capital-gains tax on appreciation$33,750
NUA total tax$57,750
IRA rollover total tax (all ordinary)$96,000
Tax saved with NUA$38,250
Example 2 - $500,000 stock, $100,000 basis, age 60, 35% ordinary, 20% LTCG + 3.8% NIIT
NUA$400,000
NUA total tax (basis 35% + NUA 23.8%)$130,200
IRA rollover total tax (all ordinary)$175,000
Tax saved with NUA$44,800
Example 3 - $200,000 stock, $50,000 basis, age 50 (under 59½), 24% ordinary, 15% LTCG
NUA: ordinary tax on basis$12,000
NUA: 10% penalty on basis$5,000
NUA: capital-gains tax on $150,000 NUA$22,500
NUA total tax$39,500
Tax saved vs rollover ($48,000)$8,500
Example 4 - High basis: $300,000 stock, $250,000 basis, age 60, 32% / 15%
NUA (only $50,000)$50,000
NUA: ordinary tax on $250,000 basis$80,000
NUA total tax$87,500
Saving shrinks - weigh the rollover's deferral$8,500
Practitioner Insight (LMN Tax Inc.)
LMN Tax Inc. - Planning Notes
The first thing we check is the basis-to-value ratio, because that single number decides whether NUA is even worth discussing. When a client retires from a company they have been at for thirty years, their stock often has a tiny basis - a few cents on the dollar - against a huge market value. That is the textbook NUA case: pay ordinary tax on almost nothing, then long-term capital gains on the whole appreciation. When the basis is half the value, the math gets much closer, and we run both ways before recommending anything.
The mistake we see most is rolling the entire 401(k) to an IRA on autopilot at retirement. Once the company stock is inside the IRA, the NUA opportunity is gone forever - every dollar will come out as ordinary income. The window is the lump-sum distribution itself, so we make sure clients understand the strategy before the rollover paperwork is signed, not after.
We also keep the comparison honest. This tool shows the rate arbitrage - capital gains versus ordinary on the appreciation - but it does not model the decades of tax-deferred compounding a rollover preserves. For a 60-year-old who will sell the stock soon, the rate saving is the whole story. For someone who would hold a diversified IRA for 25 more years, the deferral can outweigh the rate benefit, especially if the appreciation is modest. We always layer the time horizon on top of the calculator output.
One operational warning: brokers frequently mishandle NUA cost basis. When the shares land in a taxable account, the 1099-B may report the wrong basis or treat the NUA as a short-term gain. We tell clients to keep the distribution statement and the 1099-R showing box 6, and to expect to correct the brokerage reporting on Form 8949 when they sell.
When This Calculator Does Not Cover Your Situation
- The deferral advantage of a rollover. The tool compares tax on the same dollars; it does not credit the IRA for decades of tax-deferred growth. The longer your horizon and the smaller the NUA percentage, the more a rollover can win despite the higher rate.
- Not a lump-sum distribution. Full NUA treatment requires distributing the entire plan balance in one tax year after a triggering event. A partial distribution or one spanning two years can lose the deferral on the bulk of the NUA.
- The rule of 55. If you separate from service in or after the year you turn 55, the 10 percent penalty on the basis may not apply even though you are under 59½. The tool applies the penalty whenever you are under 59½.
- Bracket spillover. A large basis taken as ordinary income, or a large IRA withdrawal, can push you into higher brackets. The single marginal rate here is an estimate.
- Concentration risk. NUA keeps you holding a single company's stock for the tax benefit. Diversification, not just tax, should drive the decision.
- Death and the missing step-up. The NUA portion is income in respect of a decedent and does not receive a basis step-up at death, unlike most other inherited stock.
- State income tax. Many states tax the distribution and the later gain differently. This tool estimates federal tax only.
Frequently Asked Questions
What is net unrealized appreciation (NUA)?
Net unrealized appreciation is the increase in the value of employer stock while it was held inside your employer's qualified retirement plan, such as a 401(k). It is the difference between the stock's market value when it is distributed to you and the cost basis the plan paid for the shares. Under IRC section 402(e)(4), if you take the stock out in kind as part of a qualifying lump-sum distribution, you can pay ordinary income tax only on the lower cost basis now and defer tax on the NUA until you sell, when it is taxed at long-term capital gain rates. The NUA amount is reported in box 6 of your Form 1099-R.
How does the NUA tax strategy work?
You take your employer stock out of the 401(k) in kind, as actual shares moved to a taxable brokerage account, rather than rolling it to an IRA. In the year of the distribution you pay ordinary income tax on the stock's cost basis, which is usually a small fraction of its value. The appreciation that built up inside the plan, the NUA, is not taxed at distribution. When you later sell the shares, the NUA is taxed at long-term capital gain rates no matter how long you held them after the distribution, which is often a much lower rate than ordinary income. Any additional gain after the distribution is long-term or short-term depending on how long you held the shares.
Who qualifies for NUA treatment?
NUA treatment on all of the appreciation requires a lump-sum distribution: the distribution of your entire balance from the employer's qualified plans of one kind within a single tax year, paid because of your separation from service, after you reach age 59 and a half, because of your death, or because you became totally and permanently disabled if self-employed. The employer securities must be distributed in kind as actual shares. If the distribution is not a lump-sum distribution, NUA deferral is limited to the appreciation on employee after-tax contributions.
Is NUA taxed at long-term capital gains rates?
Yes. When you sell employer securities with tax-deferred NUA, the gain is treated as long-term capital gain up to the amount of the NUA, regardless of how long you actually held the shares after the distribution. That automatic long-term treatment is the core benefit of the strategy, because long-term capital gain rates of 0, 15, or 20 percent are usually well below ordinary income rates. Any gain above the NUA, from appreciation after the distribution, is long-term or short-term depending on your holding period, and high earners may also owe the 3.8 percent net investment income tax.
Do I pay the 10% early withdrawal penalty on an NUA distribution?
If you are under age 59 and a half, the 10 percent additional tax under IRC section 72(t) applies, but only to the cost basis, which is the part included in your gross income at distribution. The NUA itself is excluded from income at distribution, so it is not subject to the 10 percent penalty. If your lump-sum distribution follows a separation from service in or after the year you turn 55, the rule of 55 may eliminate the penalty on the basis as well. Most people use NUA at retirement at or after 59 and a half, when no penalty applies.
When is rolling employer stock to an IRA better than NUA?
A rollover often wins when the appreciation is small relative to the cost basis, because then you would pay ordinary tax on a large basis now for only a small capital gain benefit, while the IRA lets the whole balance keep compounding tax-deferred. The longer your time horizon and the smaller the NUA percentage, the more the rollover's deferral advantage matters. NUA tends to win when the stock has appreciated heavily, so the cost basis you pay ordinary tax on is a small slice of the total value and most of the value gets long-term capital gain treatment.
Where is NUA reported on tax forms?
The plan administrator reports the NUA in box 6 of the Form 1099-R for the year of the distribution. The taxable cost basis is reported as a normal distribution and included on Form 1040 line 5a and 5b. When you later sell the shares, you report the sale on Form 8949 and Schedule D, treating the gain up to the NUA amount as long-term capital gain. Keep your distribution records, because your broker may not know your NUA cost basis and could report it incorrectly.
What to Do Next
If Your Employer Stock Has Appreciated Heavily
NUA is likely worth a hard look. Run your basis and value above, then read the lump-sum and triggering-event rules in the Net Unrealized Appreciation Guide before you sign any rollover paperwork.
Official Sources
- IRC §402(e)(4) (Cornell LII) - Net Unrealized Appreciation - The statutory rule deferring tax on the appreciation in employer securities distributed from a qualified plan, and the lump-sum distribution definition.
- IRS Publication 575 - Pension and Annuity Income - The "Distributions of employer securities" section: the NUA definition, the lump-sum distribution requirement and triggering events, the long-term capital gain treatment at sale, and the basis rules.
- IRS Form 1099-R Instructions - Box 6 reports the net unrealized appreciation in employer securities included in a distribution.
- IRS Topic 412 - Lump-Sum Distributions - The lump-sum distribution rules, capital gain treatment, and Form 4972 optional methods for participants born before January 2, 1936.
- IRS Topic 558 - Additional Tax on Early Distributions - The 10 percent additional tax under §72(t) on the taxable part of a distribution before age 59½, and the exceptions.
- IRS Topic 409 - Capital Gains and Losses - The 0, 15, and 20 percent long-term capital gains rates that apply to the NUA when the shares are sold.
Disclaimer: This calculator provides estimates for educational purposes only and does not constitute tax, legal, or financial advice. The NUA framework reflects IRC §402(e)(4) and IRS Publication 575; the early-distribution tax reflects IRC §72(t). NUA treatment requires a qualifying lump-sum distribution of employer securities taken in kind. The tool compares the federal tax on the same dollars under each path and does not model the tax-deferred compounding a rollover preserves, the loss of a basis step-up on the NUA at death, bracket spillover, the rule of 55, mandatory withholding, or state tax. Diversification risk should weigh in the decision alongside tax. Consult a qualified tax professional and confirm your cost basis with the plan administrator before acting.