Net Unrealized Appreciation (NUA): Tax Strategy for Company Stock in Your 401(k) (2026)
How the Net Unrealized Appreciation (NUA) strategy can cut six-figure tax bills on company stock inside a 401(k) in 2026, with rules, math, and trade-offs.
You spent 25 years at the same employer. Some of that paycheck went into the 401(k) as employer stock — matching contributions, an ESOP slice, or shares you bought through the plan. Today that lot is worth $420,000, and your original cost was about $60,000. You’re 60, eyeing retirement, and your advisor mentions you should “just roll the whole 401(k) to an IRA.” On the surface, that is the boring, safe answer. In practice, doing that on a single share of appreciated company stock can quietly hand the IRS an extra six-figure tax bill you never needed to pay.
This guide walks through the NUA strategy in 2026 — what Net Unrealized Appreciation actually is, when it crushes a plain IRA rollover, what the rules require, and where the trade-offs hide.
What “Net Unrealized Appreciation” Actually Means
Net Unrealized Appreciation (NUA) is the gap between two numbers on the company stock sitting inside your 401(k): the cost basis (what the plan paid for those shares) and the current market value. The IRS lets you split those two pieces and tax them under different rules — but only if you take the shares out of the plan as actual stock, not as cash, and only as part of a lump-sum distribution in a single calendar year.
When you use NUA correctly:
- The cost basis is taxed as ordinary income in the year you take the distribution (your regular tax bracket — up to 37% federal in 2026 plus state).
- The appreciation — the NUA itself — is taxed at long-term capital gains rates (0%, 15%, or 20% federal in 2026) whenever you actually sell the shares.
That second line is the entire game. Long-term capital gains rates are dramatically lower than ordinary income rates for most retirees. The IRS published guidance on this in IRS Publication 575 under “Distributions of employer securities,” and it has been in the code for decades.
What Counts as a “Lump-Sum Distribution”
The IRS definition is strict. To qualify for NUA you must:
- Distribute the entire balance of every account you have under the employer plan, within one calendar year.
- The distribution must occur after a “triggering event”: separation from service (for non-self-employed), age 59½, death, or disability.
- The employer securities must be transferred in-kind (as actual shares) to a taxable brokerage account, not rolled into an IRA.
Miss any one of these and the special tax treatment disappears for that whole distribution. This is the most common way savers blow up an otherwise clean NUA opportunity.
The Math: NUA vs. Standard IRA Rollover
Numbers carry this argument better than words. Assume:
- Current value of company stock in 401(k): $420,000
- Cost basis: $60,000
- NUA (appreciation): $360,000
- Retiree marginal ordinary rate at distribution: 24% federal
- Retiree long-term capital gains rate at sale: 15% federal
- State tax: ignored for simplicity
Path A — Roll Everything Into an IRA, Then Sell Later
When you pull money from a traditional IRA, every dollar is ordinary income. Sell the stock inside the IRA and withdraw $420,000 over time and you eventually pay 24% on the full $420,000 = $100,800 federal — and that assumes you stay in the 24% bracket the whole way, which large RMDs (required minimum distributions) often blow past.
Path B — Use the NUA Election
| Component | Amount | Tax Treatment | Federal Tax |
|---|---|---|---|
| Cost basis (taxed now as ordinary income) | $60,000 | 24% ordinary | $14,400 |
| NUA — taxed at LTCG when sold | $360,000 | 15% capital gains | $54,000 |
| Total federal tax | $68,400 |
NUA path saves $32,400 in federal tax in this scenario, and that is before you factor in the timing flexibility: you don’t have to sell all $360,000 of NUA in one year. You can spread sales over multiple years to stay in the 0% capital gains bracket (taxable income under $48,350 single / $96,700 married filing jointly in 2026 — see the IRS 2026 inflation adjustments).
When NUA Beats a Standard Rollover — and When It Doesn’t
NUA isn’t free money. The strategy only wins when the ratio of appreciation to basis is high enough that the capital-gains discount outpaces the upfront ordinary-income hit.
Rule-of-Thumb Filter (2026)
| NUA as % of total stock value | Is NUA likely worth it? |
|---|---|
| Less than 25% | Usually no — basis is too large relative to gain |
| 25–50% | Maybe — depends on bracket and time horizon |
| Over 50% | Usually yes, especially in the 24%+ bracket |
| Over 75% | Almost always yes |
In our example, NUA was $360,000 of a $420,000 total — about 86% appreciation. That ratio is the meaningful number, not the dollar amount.
Where NUA Loses
- Low appreciation ratio. If cost basis is most of the position, you pay ordinary tax on most of it immediately without much offsetting capital-gains benefit.
- Very low marginal bracket. Retirees in the 12% bracket whose long-term capital gains rate is also low get a smaller delta.
- You need the IRA shelter. Inside a traditional IRA, dividends and rebalancing don’t trigger tax. In a brokerage, they do.
- Concentration risk. Holding a six-figure position in one stock is itself a risk — see how I think about index funds versus individual stocks for the diversification side of the trade.
The Trade-Offs You’ll Pay For
Pulling employer stock out as a lump sum locks in three things you should look at clearly before pulling the trigger.
1. Concentration stays concentrated. The whole point of NUA is to keep the shares for their basis-vs-market spread. If you sell them all immediately to diversify, you erase the capital-gains advantage in year one. Most practitioners use a 3-to-5-year diversification glidepath after the distribution.
2. The basis is taxed now, in one calendar year. That $14,400 (or whatever yours works out to) is due in the year of the distribution. Make sure you have cash outside the 401(k) to pay it — see how I keep an emergency-fund cushion sized to expected tax events.
3. You forfeit Roth conversion flexibility on those shares. Once the stock is in a taxable brokerage account, you cannot do a Roth IRA conversion ladder on it. The Roth ladder is a separate tool for the other 401(k) money you roll into an IRA.
4. A 10% early-withdrawal penalty may apply on the cost-basis portion if you’re under 59½ and the distribution isn’t tied to separation from service after age 55 (the “rule of 55”). Most NUA users wait until 59½ to avoid this entirely.
How to Actually Execute the NUA Election (Step-by-Step)
If you’ve decided NUA fits, here is the operational sequence. Mess up the order and you lose the tax treatment.
- Confirm a triggering event. You must have separated from service, reached 59½, become disabled, or be a beneficiary on a death distribution.
- Get the cost basis on the employer stock in writing from your plan administrator. Many plans show this on annual statements; some require a specific request. You will need this number for IRS Form 1099-R reporting later.
- Open a taxable brokerage account at the same custodian where the rest of your IRA rollover will land (or anywhere — it just needs to accept in-kind transfers).
- Tell the plan administrator: “Distribute the employer securities in-kind to my taxable brokerage account, and direct-roll the rest of the 401(k) to my IRA, in the same calendar year.” Both pieces have to happen, both in the same tax year.
- Verify the 1099-R. Box 6 should show the NUA amount. If box 6 is blank, the custodian filed it as a normal distribution and you’ll need a corrected form.
- File Form 4972 with your tax return if you also want to evaluate 10-year averaging (rarely applicable — only those born before 1936).
- Plan the sell-down. Use a multi-year schedule to stay in lower capital-gains brackets. This pairs well with tax-loss harvesting in the brokerage account to offset realized gains.
FAQ
Can I do NUA on stock I bought outside the plan?
No. NUA applies only to employer securities held inside a qualified retirement plan (401(k), ESOP, or similar). Shares bought in a regular brokerage don’t qualify.
What if my company stock dropped — is there a loss version?
No. NUA only matters when the shares appreciated. If basis exceeds market value, a standard rollover is fine and there is no special election to make.
Do I have to use NUA on all the company stock?
No. The IRS lets you choose. You can elect NUA treatment on some shares (the lots with the largest appreciation, for example) and roll the rest into an IRA. Coordinate this carefully with your plan administrator before the distribution.
Does NUA affect Social Security or Medicare premiums?
Yes — indirectly. The basis recognized as ordinary income in the distribution year counts toward MAGI and can push you into a higher IRMAA bracket for Medicare Part B and D premiums two years later. Model this before electing.
Can I still do an NUA election if I already started rolling the 401(k) to an IRA?
Almost never. Once company stock lands inside an IRA, the special NUA character is lost permanently. This is the most common irreversible mistake — confirm the distribution method before signing rollover paperwork.
Bottom Line
The NUA strategy is one of the few corners of the U.S. tax code that quietly rewards long-tenured employees who accumulated meaningful employer stock inside their 401(k). When the appreciation ratio is high and you’re in the 22%+ bracket, the savings are routinely tens of thousands of dollars — sometimes six figures on large concentrated positions. The tax code change risk is real, but the rules have been stable for decades. If your plan statement shows substantial company stock with a low cost basis, talk to a CPA before any rollover paperwork is signed.
For broader retirement positioning around this decision, see how I think about the Roth vs. Traditional 401(k) split and the 3-fund portfolio I use for early retirement.
This article is for informational purposes only and does not constitute investment advice. Always do your own research before making financial decisions.