How NUA Is Taxed: The Three-Layer Tax Structure

Most people think of NUA as a single tax event. It isn't. The NUA election creates three separate tax layers — each taxed at different rates, at different times, on different portions of your employer stock. Understanding the structure is the foundation for everything else: why NUA often saves $150K–$300K in lifetime tax, when it doesn't, and how to report it correctly.

The three layers

When you execute a qualifying NUA distribution, the stock's value is divided into three pieces based on when and how the appreciation occurred. The IRS treats each piece differently under IRC § 402(e)(4).¹

The critical insight: Layer 2 is always long-term capital gain regardless of how long you held the shares inside the plan — even if you received them last year. The IRS calls this "automatic long-term" treatment, and it's the mechanism that makes NUA so powerful.¹

Layer 1: Cost basis — ordinary income in the distribution year

In the year you take the distribution, you owe ordinary income tax on the plan's cost basis in the distributed shares. This is the "price you pay" for the favorable capital gains treatment on the rest.

What counts as cost basis? The plan's record of what was paid for each share — typically employer contributions valued at the price on the date they purchased the stock for your account. Not the current market value. If your employer contributed $40/share to buy stock that's now $800/share, the cost basis is $40/share.

2026 ordinary income rates on the cost basis:²

For a retiree stopping a paycheck mid-year, the cost basis distribution often lands in the 22%–24% bracket — which means you're paying 22–24 cents on the dollar now to convert a much larger gain into capital gains later. That trade usually makes sense.

The 10% early distribution penalty. If you're under 59½ and no exception applies, the 10% early withdrawal penalty applies to Layer 1 (the cost basis) only. It does not apply to the NUA appreciation — that amount isn't included in gross income at distribution. See the under-55 NUA guide for the full penalty analysis and breakeven ratios.

Layer 2: NUA appreciation — automatic long-term capital gains

The NUA (Net Unrealized Appreciation) is the difference between the stock's market value at distribution and the plan's cost basis. This is the amount shown in Box 6 of your 1099-R. It is not taxed in the year of distribution — it becomes taxable only when you sell the stock.

When you do sell, 100% of the NUA layer is taxed as long-term capital gain, automatically, regardless of how long you held the shares before distribution.¹ This is what "automatic LTCG" means: you can receive shares today and sell them tomorrow, and the NUA layer is still long-term.

2026 long-term capital gains rates on the NUA layer:³

NIIT overlay. If your modified adjusted gross income exceeds $200,000 (single) or $250,000 (MFJ), the 3.8% Net Investment Income Tax applies to your LTCG, including the NUA layer.⁴ The effective federal rate on NUA appreciation in the top bracket is therefore 23.8% (20% + 3.8%), not 20%. Still far below the 37% ordinary income rate from a rollover, but worth modeling if you're near these thresholds.

Layer 3: Post-distribution gain — standard holding period rules

Once the stock is in your taxable brokerage account, any additional appreciation from the distribution date forward is taxed under the standard capital gains rules: hold more than one year from the date of distribution → long-term rates; hold one year or less → short-term (ordinary income rates).

Most NUA recipients plan to hold the stock for at least one year — either to keep the 20%/23.8% rate on Layer 3 or to continue the hold toward an eventual estate step-up. But if you need to sell quickly, be aware that Layer 3 gains are short-term until you've held for 12 months from the distribution date.

Worked example: $1M position, $100K cost basis

Lisa retires at 62. Her 401(k) holds 1,000 shares of employer stock. Plan cost basis: $100 per share ($100K total). Current market value: $1,000 per share ($1M total). She executes a qualifying NUA distribution.

Compare to IRA rollover: If Lisa rolls the $1M to an IRA instead, every dollar eventually comes out as ordinary income. At a blended rate of 30% over time: ~$300,000 tax on the same $1M. NUA saves her roughly $60,900 in this scenario — and that's with a modest 10:1 appreciation ratio. At 20:1 or 30:1, the savings widen significantly.

Run your own numbers in the NUA vs Rollover Tax Calculator.

Reading your 1099-R at tax time

Your plan administrator will issue a Form 1099-R after the distribution year. Here's what the key boxes mean for NUA:

• Box 1 — Gross distribution: The total fair market value of everything distributed, including the stock. For Lisa: $1,000,000.
• Box 2a — Taxable amount: What's taxable in the current year — typically the cost basis of the distributed stock (plus any cash or non-stock amounts). For Lisa: $100,000.
• Box 6 — Net unrealized appreciation: The NUA amount — the appreciation you're deferring to sale year. For Lisa: $900,000. This number is NOT included in Box 2a and is NOT taxable this year.
• Distribution code (Box 7): Code "G" for direct rollover, or Code "7" (normal distribution, age 59½+), "1" (early distribution, no exception), or "2" (early distribution, exception applies). The code affects penalty applicability on the cost basis.

Reporting the sale on Schedule D

When you eventually sell the distributed stock, report it on Schedule D (and Form 8949) like any other capital gain, with these specifics:

• Cost basis: The plan's cost basis — the same number in Box 2a of the 1099-R. Not the market value at distribution. Not what you originally paid if you purchased shares separately.
• Date acquired: The date of the in-kind distribution (when the shares arrived in your taxable brokerage account).
• Holding period: Mark as long-term for the NUA layer. IRS Publication 575 confirms that the NUA amount is always long-term regardless of actual holding period.⁵
• Proceeds: What you received when you sold the shares.

If you sell the shares all at once, one Schedule D line covers both the NUA layer (Layer 2) and any post-distribution gain (Layer 3) — they're lumped as a single sale. The distinction between Layer 2 and Layer 3 only matters if Layer 3 is short-term (held ≤1 year). In that case, you may need to allocate proceeds between the NUA portion and the post-distribution portion for accurate reporting.

The estate planning exception

If you die holding the distributed employer stock without selling, two things happen:⁶

1. The NUA appreciation (Layer 2) receives a stepped-up basis — eliminating the capital gains tax entirely. Your heirs inherit the shares at the date-of-death market value.
2. The cost basis layer (Layer 1) does NOT step up — it was income in respect of a decedent (IRD) from the moment of distribution. Your heirs must report that portion as ordinary income when they receive it (though it's already been taxed once if you paid income tax on it at distribution).

This asymmetry is what makes the "hold to death" NUA strategy particularly powerful for large, highly-appreciated positions: the NUA appreciation escapes capital gains tax entirely, while the cost basis portion already benefited from potentially lower income rates at distribution. See the NUA and estate planning guide for the full IRD/step-up analysis and how estate size interacts with the 2026 $15M exemption (OBBBA).

Common tax reporting mistakes to avoid

• Reporting the full distribution as taxable in the distribution year. Only the cost basis (Box 2a) is taxable that year. The Box 6 NUA amount is not.
• Using the wrong cost basis when selling. The cost basis is what's in Box 2a, not the stock's market value on the distribution date and not what the shares are worth when you sell.
• Treating the NUA layer as short-term gain. Layer 2 (the NUA itself) is always long-term, regardless of when you sell.
• Forgetting NIIT exposure. High earners owe an additional 3.8% on the NUA gain above the threshold — don't model NUA at 20% if you're above $250K MFJ in income.
• Double-counting the cost basis at death. If you paid ordinary income tax on the cost basis at distribution, that amount is no longer IRD to heirs — it's already been taxed. Only unreported IRD (the NUA amount on Layer 2 before step-up) is relevant for estate purposes.

Is NUA the right move for you?

The tax math here is only part of the picture. The optimal strategy depends on your appreciation ratio, state of residence, income in the distribution year, estate goals, and how long you plan to hold the stock. A fee-only NUA specialist can model all three layers — and compare them to the full IRA rollover scenario — before you make this one-shot decision.

Sources

1. IRC § 402(e)(4) — Net unrealized appreciation in employer's securities; automatic long-term treatment confirmed in IRS Notice 98-24 and IRS Publication 575.
2. IRS Rev. Proc. 2025-40 (as amended by OBBBA) — 2026 ordinary income tax brackets. Verified May 2026.
3. Tax Foundation 2026 Capital Gains Tax Brackets — 2026 LTCG rate thresholds for single and MFJ filers. Verified May 2026.
4. IRS — Net Investment Income Tax — IRC § 1411, 3.8% surtax; thresholds $200K single / $250K MFJ (not inflation-adjusted).
5. IRS Publication 575 — Pension and Annuity Income — NUA holding period treatment and Schedule D reporting instructions.
6. IRS Publication 559 — Survivors, Executors, and Administrators — Income in respect of a decedent (IRD) treatment; IRC § 1014 step-up; interaction with NUA.

Tax values on this page reflect 2026 rates per IRS Rev. Proc. 2025-40 and the One Big Beautiful Bill Act (OBBBA, July 2025). Consult a qualified tax professional for advice specific to your situation.