NUA and the 0% Capital Gains Bracket: Selling Employer Stock Tax-Free in Retirement

Most NUA analyses focus on the decision before distribution: is 15–20% on the appreciation better than 37% on a rollover? They stop there. But a second opportunity exists after the distribution, one that almost nobody models: if your retirement income is low enough, you can sell the employer stock and pay zero federal capital gains tax on the appreciation — not 15%, not 20%, but 0%. The 2026 threshold is $98,900 of taxable income for married filers and $49,450 for single filers. For retirees in early retirement before RMDs begin, this window is often wider than expected.

How the 0% LTCG bracket works

Long-term capital gains are taxed at preferential rates — 0%, 15%, or 20% — based on your total taxable income for the year, including the gain itself. The 0% rate applies to gains that fall below a specific taxable income threshold. If your combined taxable income (ordinary income + capital gains) stays under that threshold, the portion of capital gains that fits inside the bracket is taxed at zero.

This applies to NUA stock. When you sell employer stock distributed via an NUA election, the gain (the NUA appreciation plus any subsequent post-distribution gain held long-term) is a long-term capital gain.¹ That gain is eligible for the 0% rate if your taxable income — including that gain — doesn't exceed the threshold.

2026 thresholds

Source: IRS Rev. Proc. 2025-32. Thresholds are taxable income (after deductions), not gross income. 2026 standard deduction: $16,100 single / $32,200 MFJ (plus $2,050 per person aged 65+ for single; $1,650 per eligible spouse for MFJ).

Calculating your 0% headroom

The calculation is straightforward in concept, though Social Security taxation adds a complication (addressed in the next section):

1. Start with your 0% ceiling: $98,900 (MFJ) or $49,450 (single).
2. Calculate your taxable income from non-capital-gains sources: pension + taxable Social Security + IRA distributions + any other ordinary income, minus your standard or itemized deduction.
3. Subtract step 2 from step 1. The result is your 0% LTCG headroom — the maximum amount of NUA stock appreciation you can realize this year at 0% federal tax.

Example before Social Security interaction: A couple with $60,000 pension, 85%-taxable SS of $37,400, standard deduction of $35,500 (both age 68) → taxable income from ordinary sources: $60,000 + $37,400 − $35,500 = $61,900. Their 0% LTCG headroom: $98,900 − $61,900 = $37,000.

The Social Security stacking interaction

Social Security creates a complication. Capital gains count as income for purposes of the SS provisional income test,² which means selling NUA stock can increase the portion of your SS benefits subject to income tax. This "stacking" effect reduces your effective 0% LTCG headroom.

The provisional income tiers (unchanged since 1984–1993):

• MFJ: PI below $32,000 → 0% of SS taxable; $32,000–$44,000 → up to 50% taxable; above $44,000 → up to 85% taxable
• Single: PI below $25,000 → 0% taxable; $25,000–$34,000 → up to 50% taxable; above $34,000 → up to 85% taxable

Provisional income (PI) = all non-SS income + 50% of gross SS benefits. Capital gains from NUA stock sales count in full toward PI.

Two scenarios:

Scenario A — SS already at maximum (85% fully saturated): If your PI is already well above the 85% tier threshold before any NUA stock sales, selling NUA stock doesn't change your SS taxation — it's already maxed. Every dollar of LTCG adds exactly one dollar to taxable income. Your headroom calculation is clean.

Scenario B — SS not yet at maximum: If selling NUA stock pushes your PI higher and moves more SS income into the taxable bucket, your effective headroom is reduced. Each dollar of NUA gain can add up to $1.85 to taxable income: $1.00 of LTCG plus approximately $0.85 of additional SS income becoming taxable. In this scenario you need to solve for X (amount to sell) iteratively — or have an advisor model it.

Worked example: Margaret & Tom

Margaret and Tom are both 68, married filing jointly. They retired from a major industrial manufacturer after 30+ years of service. Tom received an NUA distribution two years ago: $720,000 of employer stock distributed in-kind, cost basis $80,000 (a 9:1 appreciation ratio). The stock now sits in a taxable brokerage account.

Annual income:

• Pension: $60,000/year
• Social Security: $44,000/year combined ($22,000 each)
• IRA distributions: none (RMDs don't begin until age 73)

Step 1: Determine SS taxable amount. Provisional income: $60,000 (pension) + $22,000 (50% × SS) = $82,000. This exceeds the MFJ threshold at which 85% of SS is fully taxable. At their SS level, 85% of $44,000 = $37,400. The provisional income calculation confirms SS is at its maximum taxable amount: $37,400.²

Step 2: Calculate taxable income before NUA sales.

• Pension: $60,000
• Taxable SS: $37,400
• Standard deduction (MFJ + both 65+): $32,200 + $1,650 + $1,650 = $35,500
• Taxable income: $60,000 + $37,400 − $35,500 = $61,900

Step 3: Calculate 0% LTCG headroom. $98,900 − $61,900 = $37,000.

Step 4: Verify SS doesn't change. Since their PI is already past the saturation point, selling $37,000 of NUA stock doesn't push more SS into the taxable bucket. New PI = $82,000 + $37,000 = $119,000 — SS remains at $37,400. ✓

Step 5: Verify taxable income stays at or below $98,900. $61,900 + $37,000 = $98,900. Exactly at the ceiling. ✓

Result: Margaret and Tom can sell $37,000 of their NUA employer stock this year and pay zero federal capital gains tax on that $37,000 of appreciation. They also have no NIIT exposure (MAGI = $141,000, well below the $250,000 MFJ NIIT threshold). Their state may impose LTCG tax — that depends on their state of residence.

Over 10 years at $37,000/year: $370,000 of appreciation sold at 0% federal rate. If they had rolled the stock to an IRA instead, those equivalent withdrawals would be taxed as ordinary income at rates likely in the 22–32% range. The 0% harvest strategy saves them approximately $55,000–$118,000 in federal taxes on just this portion of the position.

The remaining $270,000 of appreciation ($640,000 total NUA minus the $370,000 harvested) can be managed through estate step-up at death, charitable giving, or sold at 15% LTCG in later years when RMDs push income higher.

NIIT: why it doesn't apply at the 0% bracket

The Net Investment Income Tax (NIIT) — 3.8% on net investment income — applies only when MAGI exceeds $200,000 (single) or $250,000 (MFJ).³ This threshold is not indexed for inflation.

Retirees who are within the 0% LTCG bracket will, in almost every case, also be below the NIIT threshold. A married couple with $98,900 of taxable income has MAGI well below $250,000. This means the 0% bracket strategy is genuinely zero federal tax on the NUA gain — not 0% LTCG but 3.8% NIIT. Both rates are zero simultaneously.

This contrasts with the situation for higher-income retirees, who may owe 15% + 3.8% = 18.8%, or 20% + 3.8% = 23.8%, on their NUA appreciation. For them, the relevant guide is NUA and the NIIT.

The multi-year harvest strategy

Few retirees can sell their entire NUA position at 0% in a single year — the position is too large. But the NUA appreciation doesn't expire. Your employer stock can sit in the taxable brokerage account indefinitely. You sell measured tranches each year, staying within your 0% headroom.

The typical harvest schedule depends on the size of the position and the headroom available:

Importantly, the 0% window is often widest in the years between retirement and RMDs — typically ages 62–72. Once RMDs begin at age 73 (or 75 for those born in 1960 or later under SECURE 2.0),⁴ mandatory IRA withdrawals increase ordinary income and reduce 0% LTCG headroom. Many retirees find their best harvesting years are the decade before RMDs begin.

When the 0% bracket can't help

The strategy has real limitations. Retirees in these situations get little or no benefit:

• High pension or other ordinary income: If your pension and taxable SS already exceed $98,900 (MFJ), your taxable income is already at or above the 0% ceiling before any NUA sales. You're in the 15% or higher bracket regardless. Your relevant guide is NUA and the NIIT.
• Very large NUA positions relative to headroom: A retiree with $2M of NUA appreciation and $35,000/year of headroom will spend 57+ years harvesting — unrealistic. For large positions, the 0% strategy captures a meaningful portion but the majority will eventually be taxed at 15%+ or escape tax entirely via estate step-up.
• States without LTCG preference: California, New Jersey, New York, and several other states tax LTCG as ordinary income. The federal 0% bracket only eliminates federal tax — your state may still impose 5–13%+ on the same gain. See NUA and State Taxes for the full picture.
• Year of NUA distribution: In the year you take the NUA distribution, the cost basis lands as ordinary income. That additional ordinary income may reduce or eliminate your 0% LTCG headroom in that specific year. The 0% harvest strategy applies to the post-distribution sale years, not the distribution year itself.

Holding period: NUA amount vs. post-distribution gains

NUA stock has two layers of appreciation after distribution, and they receive different holding period treatment:

• The NUA amount (the appreciation accrued inside the plan, reported in Box 6 of Form 1099-R) is automatically deemed long-term capital gain when sold, regardless of how long you hold the shares after distribution.¹ You can sell on day one and it's LTCG eligible for the 0% bracket.
• Post-distribution appreciation (any increase in value after the distribution date) is short-term until you've held the shares for more than one year. Short-term gains are ordinary income — not eligible for the 0% LTCG rate. To qualify post-distribution gains for the 0% bracket, hold shares at least 12 months from the distribution date before selling.

For practical purposes, most 0% harvesting involves the NUA amount itself, not post-distribution gains. The NUA appreciation is the larger number and is immediately LTCG-eligible.

Sources

1. IRC § 402(e)(4) — NUA exclusion and long-term capital gain treatment. The net unrealized appreciation in employer securities distributed in a lump-sum distribution is excluded from gross income at distribution and treated as long-term capital gain when the stock is subsequently sold, regardless of holding period after distribution. Post-distribution appreciation is short-term until held over one year.
2. IRS Publication 915 — Social Security and Equivalent Railroad Retirement Benefits. Provisional income definition: adjusted gross income + non-taxable interest + 50% of SS benefits. Capital gains are included in AGI and therefore in provisional income. MFJ tiers: $32,000 (50% threshold) and $44,000 (85% threshold). Single tiers: $25,000 and $34,000. These thresholds have not been adjusted for inflation since enactment (1984/1993 respectively).
3. IRS: Net Investment Income Tax. IRC § 1411; 3.8% applies to net investment income (including long-term capital gains) for taxpayers with MAGI exceeding $200,000 (single) or $250,000 (MFJ). Threshold not indexed for inflation. Confirmed unchanged through 2026.
4. IRS: Required Minimum Distributions. SECURE 2.0 Act (§ 107): RMD beginning age is 73 for individuals born 1951–1959; age 75 for individuals born 1960 or later. Uniform Lifetime Table divisors used to calculate annual RMD amounts from traditional IRAs and 401(k)s.
5. Tax Foundation: 2026 Federal Tax Brackets and Capital Gains Rates. LTCG 0% threshold: $49,450 single, $98,900 MFJ. 15% bracket: $49,451–$545,500 single, $98,901–$613,700 MFJ. 20% bracket above: $545,501 single, $613,701 MFJ. Source: IRS Rev. Proc. 2025-32.
6. Kiplinger: Standard Deduction 2026 Amounts. Standard deduction 2026: $16,100 single, $32,200 MFJ. Additional deduction for age 65+: $2,050 single (per person), $1,650 per qualifying spouse MFJ. Source: IRS Rev. Proc. 2025-32.

NUA tax treatment governed by IRC § 402(e)(4). LTCG rates and thresholds from IRS Rev. Proc. 2025-32 (Tax Foundation verification). SS provisional income rules under IRC § 86 (IRS Pub. 915). NIIT under IRC § 1411. RMD ages per SECURE 2.0 § 107. All values verified against 2026 IRS guidance. Content is for informational purposes only and does not constitute tax or financial advice. Consult a qualified advisor for your situation.