Net Unrealized Appreciation (NUA): Tax Strategy for Company Stock in Your 401(k)

What is net unrealized appreciation?

Net unrealized appreciation (NUA) is the difference between the fair market value of employer stock in your retirement plan and the cost basis the plan originally paid for those shares. Under IRC §402(e)(4)(B), if you take a qualifying lump-sum distribution of employer stock in kind — meaning you receive the actual shares, not cash — the NUA portion is not taxed as ordinary income at distribution. Instead, it qualifies as a long-term capital gain when you eventually sell the shares, regardless of how long you hold them after the distribution.¹

That's the core of the strategy: swap ordinary income tax rates on the NUA (potentially 32–37%) for long-term capital gains rates (15–20% + 3.8% NIIT) — a spread of up to 17 percentage points on a large, appreciated position.

Eligibility requirements

The NUA rules are precise. Missing any single condition means the entire distribution is treated as ordinary income at receipt. The four requirements:¹³

• Employer securities only. Must be stock (or other securities) of the employer that sponsors the plan, held inside a qualified plan: 401(k), ESOP, pension, or profit-sharing plan. Your own mutual fund selections don't qualify — only stock issued by the plan sponsor.
• Lump-sum distribution. You must distribute the entire plan balance in a single calendar year. You can simultaneously roll the non-stock assets (mutual funds, cash, bonds) to an IRA — the stock simply cannot go to an IRA. It must be distributed in-kind to a taxable brokerage account.
• Triggering event. One of four: (1) separation from service (retirement, termination, resignation); (2) death; (3) disability for self-employed participants; or (4) reaching age 59½. Age 59½ is the most flexible trigger — it can apply to current employees if the plan allows in-service distributions.
• All accounts from the same employer. If you have multiple plan accounts (e.g., a 401k and a profit-sharing plan) from the same employer, you must distribute all of them in the same calendar year to qualify.

How the tax treatment works

When you execute the lump-sum distribution:

1. The cost basis (what the plan originally paid for the shares, including any after-tax contributions) is includible in your ordinary income for that year. Tax is due in the year of distribution at your marginal rate.
2. The NUA — the appreciation above basis — is deferred. No tax at distribution. When you sell the shares, NUA is taxed as a long-term capital gain at 2026 LTCG rates regardless of how long you hold the shares post-distribution.²
3. Any additional appreciation after the distribution date is taxed as short-term or long-term depending on your actual holding period after distribution — not NUA treatment.
4. The non-stock plan balance rolls to an IRA in the same transaction with no current tax event.

When the NUA strategy makes sense

The NUA analysis hinges on two numbers: your NUA ratio (NUA ÷ FMV) and the spread between your ordinary income rate and your LTCG+NIIT rate. The higher both numbers, the more compelling the strategy.

NUA typically wins when:

• High NUA ratio (60%+ of FMV). At a 90% NUA ratio, almost all of the position is taxed at LTCG rates — the relatively small basis hit is manageable. At a 20% NUA ratio, you're paying ordinary income on 80% of the position's value with limited LTCG benefit.
• High current and future marginal rate. If you're in the 32–37% bracket now and expect to remain there in retirement (due to pensions, RMDs, or other income sources), the LTCG arbitrage is maximum. If your future rate drops to 22%, the NUA advantage narrows substantially.
• Small basis relative to total plan balance. A $40K basis on a $600K position means a modest current-year tax hit for a large LTCG benefit. A $300K basis on a $400K position is a different calculation — you're paying ordinary income on 75% of the value upfront.
• Long holding period anticipated. The longer you hold NUA shares before selling, the more additional appreciation can stack on top (potentially at LTCG rates after a 1-year hold). Immediate sale locks in the NUA benefit; holding potentially adds more.

NUA may not make sense when:

• The NUA ratio is below 30–40% — you're paying significant ordinary income today for limited LTCG savings.
• You're under 59½ without the age-55 separation-from-service exception — the 10% early distribution penalty applies to the basis portion.
• The lump-sum year would spike your MAGI significantly for IRMAA, AMT, or bracket purposes. See the IRMAA section below.
• A Roth conversion strategy produces a better long-term result (especially if you have low-income years available before RMDs begin).

Key traps and risks

1. The partial-distribution trap. The lump-sum distribution rule is absolute: the entire plan balance must come out in a single calendar year. Taking 80% one year and 20% the next disqualifies the NUA treatment for all of it. Plan the execution carefully — ideally with your plan administrator confirming the distribution mechanics in advance.
2. The "wash" trap inside the plan. If the plan trustee sells and repurchases employer stock at a higher price before your distribution — common when plans rebalance or DRIP dividends — each repurchase creates new lots at current market price, increasing basis and reducing NUA. Review your plan statements for the years before retirement to understand your actual per-share cost basis.
3. IRMAA lookback. A large basis distribution can spike your MAGI for Medicare IRMAA purposes for two years. Distributing $200,000 of basis income in 2026 means Medicare reviews 2026 income in 2028 to determine your Part B and Part D surcharges. See our IRMAA planning guide for the full 2026 bracket table and surcharge amounts.
4. The 10% early distribution penalty on basis. If you're under 59½ and not using the age-55 separation-from-service exception (IRC §72(t)(2)(A)(v)), the 10% early distribution penalty applies to the basis portion — not the NUA. The NUA portion escapes the penalty but is deferred as LTCG anyway. Verify your triggering event and exception status before executing.
5. State income taxes on the basis. Most states with income taxes will tax the basis distribution as ordinary income. California (13.3% top rate), New York (10.9%), New Jersey (10.75%), and Minnesota (9.85%) can substantially erode the federal tax arbitrage. A state-specific model is necessary for residents of high-tax states — the federal savings may remain compelling, but the numbers look different. See our state income tax planning guide.
6. AMT exposure on a large distribution year. Under the OBBBA (enacted July 2025), the AMT exemption phaseout threshold was reset to $1,000,000 MFJ with a 50% phaseout rate. A large basis distribution that pushes AMTI above this threshold can trigger an AMT liability that partially offsets NUA savings. See our AMT planning guide.

Integrating NUA with your broader retirement strategy

The NUA decision doesn't stand alone — it interacts with several other retirement planning levers:

• Roth conversion window (ages 62–72). If you have a large IRA balance and intend to use the years between retirement and RMD age for Roth conversions, a large NUA distribution year competes for the same low-income window. Sequencing matters: NUA in year 1, then Roth conversions in subsequent years, is often more tax-efficient than trying to do both simultaneously.
• Social Security delay coordination. If you can delay Social Security to age 70 (maximizing the benefit) while living on a mix of NUA shares and Roth distributions in the gap years, you reduce the provisional income that determines the taxability of Social Security benefits. A $5M portfolio with $800K in NUA employer stock has multiple income levers to coordinate.
• Concentrated position timing. NUA shares sit in your taxable account after distribution. If the stock continues to appreciate, you're now holding a concentrated position outside the safety of a tax-deferred wrapper. Our concentrated stock guide covers the diversification math — the same phased diversification, collar, and exchange fund strategies apply.
• RMD integration. If you defer selling NUA shares and hold them into your 70s or 80s, they remain in your taxable account with no RMD obligation. This can complement RMD-reduction strategies — keeping the stock in a taxable account removes it from the IRA pool that generates forced withdrawals. See our RMD planning guide.

Find an advisor who understands the NUA rules

The NUA decision involves precise execution: coordinating the lump-sum distribution year, modeling IRMAA exposure, integrating with Roth conversion windows, and deciding whether to sell NUA shares immediately or hold for further appreciation. Getting it wrong — taking a partial distribution, missing the triggering event requirement, or failing to account for state tax — can mean paying full ordinary income tax on a position that qualified for capital gains treatment. A fee-only fiduciary with experience in employer stock planning can model the full scenario before you execute.

Fee-only · No commissions · Free match · No obligation