Want the tax figures for your own employer stock - basis tax, NUA capital gains, and the rollover comparison side by side? Run your numbers in the calculator.
Open the Net Unrealized Appreciation Calculator →Net unrealized appreciation (NUA) is a tax election for appreciated employer stock held in a 401(k). Instead of rolling the stock to an IRA, you distribute the shares in kind, pay ordinary income tax only on the cost basis now, and the in-plan gain (the NUA) is taxed at long-term capital gain rates when you sell - automatically long-term, whatever your holding period. It requires a qualifying lump-sum distribution after a triggering event. NUA wins big when the basis is small and the appreciation large; a routine rollover is better when the basis is high or your time horizon is long enough that tax deferral outweighs the rate break.
- NUA splits the tax: ordinary income on the basis now; long-term capital gain on the appreciation at sale (IRC §402(e)(4)).
- The gain is automatic long-term up to the NUA amount, regardless of how long you hold after the distribution.
- It needs a lump-sum distribution: the whole account in one tax year, taken in kind, after separation, 59½, death, or disability.
- The 10 percent penalty hits the basis only, not the NUA, and only under 59½ with no exception.
- It is reported in box 6 of Form 1099-R; the later sale goes on Form 8949 and Schedule D.
- NUA wins on heavy appreciation; a rollover wins on a high basis and a long deferral horizon.
- Rolling the stock to an IRA destroys NUA forever - the election only exists at the distribution.
- The NUA gets no step-up at death; it is income in respect of a decedent.
- Concentration risk is real - the strategy keeps you holding one company's stock.
What Net Unrealized Appreciation Is
Net unrealized appreciation is the growth in the value of your employer's stock that happened while the shares sat inside your qualified retirement plan - usually a 401(k) or employee stock ownership plan. Put simply, it is the difference between the stock's market value when it is distributed to you and the cost basis the plan recorded for those shares.
Suppose your 401(k) holds company stock the plan bought for $75,000 over your career, now worth $300,000. The cost basis is $75,000 and the NUA is $225,000. That $225,000 is the appreciation that built up tax-deferred inside the plan, and it is the amount the NUA rules let you tax at favorable capital gain rates instead of ordinary income.
The rule comes from IRC §402(e)(4) and is explained in IRS Publication 575 under "Distributions of employer securities." It applies only to actual employer securities - the corporation's stock, bonds, registered debentures, and debentures with interest coupons - distributed in kind from the plan. It does not apply to cash, mutual funds, or any other investment in the account.
How the NUA Strategy Works
The mechanics are straightforward but the timing is unforgiving. Rather than rolling your entire 401(k) into an IRA when you leave or retire, you direct the plan to distribute the employer stock in kind - moving the actual shares into a regular taxable brokerage account - while the rest of the account can still be rolled to an IRA.
In the year of that distribution, you include the stock's cost basis in your income and pay ordinary income tax on it. Because the basis is often a small fraction of the value, that up-front tax bill is modest. The appreciation - the NUA - is not taxed at distribution. It sits in your brokerage account untaxed until you sell.
When you do sell, the gain up to the NUA amount is taxed as long-term capital gain, no matter how briefly you held the shares after they left the plan. You could sell the next day and still get long-term treatment on the NUA. That conversion of ordinary income into capital gain on the bulk of the value is the entire benefit of the strategy.
The Lump-Sum Distribution Requirement
To defer tax on all of the NUA, the distribution must qualify as a lump-sum distribution. IRS Publication 575 defines this precisely: it is the distribution or payment, within a single tax year, of your entire balance from all of the employer's qualified plans of one kind (all pension plans, all profit-sharing plans, or all stock bonus plans), and it must be paid for one of these reasons:
- Because of your separation from service (leaving the job);
- After you reach age 59½;
- Because of your death; or
- Because you became totally and permanently disabled, if you are self-employed.
Two details trip people up. First, the entire account must come out in one tax year - if you take part of it in December and the rest in January, you can blow the lump-sum status. Second, the employer securities must be distributed in kind as shares; if the plan sells the stock and sends you cash, there is nothing left to apply NUA to. If the distribution does not meet the lump-sum definition, NUA deferral is limited to the appreciation on your own after-tax contributions, which is usually a small slice.
The Basis-versus-Appreciation Tax Split
NUA works by splitting one block of value into two pieces taxed at two different rates and two different times. Understanding the split is the key to the whole strategy.
The cost basis - ordinary income, now
The basis is included in your gross income in the year of the distribution and taxed at your ordinary rate. This is the immediate cost of the strategy. On a $75,000 basis in the 32 percent bracket, that is $24,000 of tax due for the distribution year.
The NUA - long-term capital gain, at sale
The appreciation is taxed only when you sell, at the long-term capital gain rates of 0, 15, or 20 percent depending on your income. On $225,000 of NUA at 15 percent, that is $33,750 - and it is deferred until the sale. Compare that to rolling the whole $300,000 to an IRA, where the entire amount eventually comes out as ordinary income: at 32 percent that is $96,000. The NUA path here costs $57,750 against $96,000, a saving near $38,250.
Post-distribution growth
Any gain above the NUA - appreciation that happens after the shares are in your brokerage account - is ordinary capital gain treatment based on your actual holding period from the distribution date: long-term if held more than a year, short-term if sold sooner.
The 10 Percent Penalty and the Basis
If you take the distribution before age 59½, the 10 percent additional tax under IRC §72(t) is a concern - but a limited one. The penalty applies only to the amount included in your income, which is the cost basis. The NUA is excluded from income at distribution, so it is never hit with the early-distribution penalty.
That means a 50-year-old taking $200,000 of stock with a $50,000 basis faces the 10 percent penalty on the $50,000 basis ($5,000), not on the $150,000 NUA. The penalty is real but small relative to the value, which is why NUA can still beat a rollover even before 59½.
There is also a common escape: if your lump-sum distribution follows a separation from service in or after the year you turn 55, the rule of 55 may waive the 10 percent penalty on the basis entirely. Most people, though, use NUA at retirement at or after 59½, when there is no penalty to worry about at all. For the exception list, see the Early Withdrawal Penalty Guide.
NUA versus an IRA Rollover, Side by Side
The decision is almost always NUA versus the default move - rolling the whole 401(k), stock included, into a traditional IRA. Here is the same $300,000 of stock with a $75,000 basis, at age 60, 32 percent ordinary and 15 percent capital gains, sold soon after distribution.
| Cost | NUA Strategy | IRA Rollover |
|---|---|---|
| Tax at distribution | $24,000 (ordinary on basis) | $0 |
| Tax on the appreciation | $33,750 (15% on NUA) | $96,000 (32% ordinary, later) |
| Total federal tax | $57,750 | $96,000 |
| Net proceeds on $300,000 | $242,250 | $204,000 |
| Continued tax deferral | No - shares are in a brokerage | Yes - whole balance |
| Tax saved with NUA | about $38,250 | |
The catch the table cannot show is time. The rollover keeps the entire $300,000 compounding tax-deferred, while NUA forces you to pay the $24,000 basis tax now and gives up the shelter. For a short horizon, the rate saving dominates and NUA wins clearly. For a very long horizon with modest appreciation, the deferral can flip the answer. Run your own figures in the Net Unrealized Appreciation Calculator.
See the basis tax, the NUA capital gains, and the rollover comparison for your exact numbers in seconds.
Open the Net Unrealized Appreciation Calculator →When NUA Wins and When It Loses
The single most important number is the ratio of cost basis to market value. The lower the basis as a share of value, the stronger the case for NUA.
NUA tends to win when
- The stock has appreciated heavily, so the basis you pay ordinary tax on is a small slice of the total.
- Your ordinary tax rate is well above your capital gains rate, widening the rate arbitrage.
- You plan to sell the shares within a few years, so the rollover's deferral advantage has little time to build.
- You want some money accessible in a taxable account rather than locked in an IRA until distributions.
A rollover tends to win when
- The cost basis is a large fraction of the value, so the up-front ordinary tax on the basis is steep.
- You have a long time horizon and would keep the money invested tax-deferred for many years.
- You want to diversify out of the company stock immediately - inside an IRA you can sell and rebalance with no current tax.
- Your capital gains rate is close to your ordinary rate (for example, low overall income), shrinking the benefit.
Reporting NUA on Your Tax Return
The plan administrator reports the distribution on Form 1099-R. The key figure is box 6, which shows the net unrealized appreciation in employer securities included in the distribution. The taxable cost basis is reported as a normal distribution and flows to Form 1040 lines 5a and 5b.
When you later sell the shares, you report the sale on Form 8949 and Schedule D. The gain up to the box 6 NUA amount is entered as long-term capital gain regardless of holding period; any gain above the NUA follows your actual holding period. A participant born before January 2, 1936, may also be able to use the optional 10-year tax option or capital gain treatment on Form 4972, a narrow legacy rule.
Keep your records carefully. Brokers frequently report NUA cost basis incorrectly on the 1099-B when the shares are sold, sometimes treating the whole gain as short-term. Retain the distribution statement and the 1099-R showing box 6 so you can report the correct long-term NUA gain on Form 8949.
Common NUA Mistakes
- Rolling everything to an IRA first. The most expensive mistake. Once the stock is in the IRA, NUA is gone for good and all of it becomes future ordinary income.
- Splitting the distribution across two tax years. This can disqualify the lump-sum status and limit NUA to after-tax contribution appreciation only.
- Letting the plan sell the stock. NUA needs the shares distributed in kind. Cash proceeds leave nothing to apply the election to.
- Ignoring concentration risk. The strategy ties you to a single stock for the tax benefit. A crash in the company can erase a saving many times larger than the tax.
- Forgetting the basis tax is due now. You need cash to pay the ordinary tax on the basis in the distribution year, ideally from outside the account.
- Assuming a step-up at death. The NUA is income in respect of a decedent and is not stepped up, unlike most inherited stock.
Practitioner Insight (LMN Tax Inc.)
The first question we ask a retiring client with company stock is the cost basis, because that one number decides whether NUA is worth pursuing. A thirty-year employee often has a basis of pennies on the dollar - the classic case. They can pay ordinary tax on almost nothing and convert the entire appreciation to long-term capital gain. When the basis is half the value, the math gets close and we model both paths carefully before recommending anything.
The error we see most is the autopilot rollover. A client retires, the broker rolls the whole 401(k) to an IRA, and the company stock goes in with it. The NUA opportunity dies silently at that moment, and nobody notices until we are doing the return a year later. The election only exists at the lump-sum distribution, so we get involved before the paperwork is signed, never after.
We are also careful not to oversell the strategy. The rate arbitrage is real, but the rollover preserves decades of tax-deferred compounding on the whole balance, and NUA makes you pay the basis tax up front and locks you into one stock. For a 60-year-old who will sell soon and diversify, NUA usually wins. For someone who would hold a diversified IRA for 25 years, the deferral can beat the rate break, especially with modest appreciation. We layer the time horizon and the concentration risk on top of the tax math every time.
Finally, we warn clients about brokerage reporting. When the shares hit the taxable account and are later sold, the 1099-B routinely gets the NUA basis wrong. We tell them to keep the 1099-R with box 6 filled in and to expect to correct the gain character on Form 8949. It is a small administrative headache that protects a large tax benefit.
Real-World Scenarios
When the General Rules Differ
- The deferral can outweigh the rate. A rollover shelters the whole balance for years of tax-deferred growth. The longer the horizon and the smaller the NUA percentage, the more a rollover can win even at a higher rate.
- Partial or multi-year distributions. NUA on all the appreciation needs a single-tax-year lump-sum distribution of the entire account; spreading it out can forfeit most of the benefit.
- The rule of 55. Separating from service at 55 or older can waive the 10 percent penalty on the basis even though you are under 59½.
- Death and income in respect of a decedent. The NUA does not get a basis step-up at death; heirs still owe capital gains tax on it when they sell.
- Born before January 2, 1936. A narrow legacy rule allows the 10-year tax option or capital gain treatment on Form 4972 for the rest of a lump-sum distribution.
- State income tax. States may treat the basis distribution and the later capital gain differently from the federal rules.
Frequently Asked Questions
What to Do Next
NUA is likely worth pursuing. Run your basis and value in the Net Unrealized Appreciation Calculator, then confirm the lump-sum timing with your plan administrator before any rollover.
The penalty on the basis matters. Model it with the Early Withdrawal Penalty Calculator and check the rule-of-55 and other exceptions in the Early Withdrawal Penalty Guide.
The NUA is taxed like any long-term gain at sale. See how the 0, 15, and 20 percent brackets stack with your income in the Qualified Dividends & Capital Gains Tax Calculator.
Weigh NUA against borrowing or withdrawing with the 401(k) Loan vs Hardship Withdrawal Calculator, and check required distributions with the Required Minimum Distributions guide.
Related Tools and Guides
- IRC §402(e)(4) (Cornell LII) - Net Unrealized Appreciation - The statutory rule deferring tax on the appreciation in employer securities 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 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 and the 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.
- IRS Topic 409 - Capital Gains and Losses - The 0, 15, and 20 percent long-term capital gains rates that apply to the NUA at sale.