Summary: This case study examines how a recently retired executive used Net Unrealized Appreciation (NUA) on highly appreciated employer stock inside a 401(k), combined with strategic rollovers to an IRA, a backdoor Roth IRA, and delayed Social Security claiming, to lower lifetime taxes, reduce the effective bite of required minimum distributions (RMDs), and increase spendable retirement income. The example is anonymized and uses concrete numbers to show how the mechanics work and what trade-offs the retiree accepted.

Background: the client and the position

“John,” age 66 at separation, spent 30 years at a publicly traded manufacturing company. At retirement his plan balances were:

  • 401(k): $930,000 total, including $600,000 in company stock (cost basis $60,000) and $330,000 in diversified mutual funds
  • Pension: $18,000 per year (single-life annuity)
  • Projected Social Security: $20,500/year at full retirement age; he planned to delay to 70
  • Tax filing status: married filing jointly; no other significant taxable accounts

John’s goals were straightforward: maximize after-tax cash flow in his 70s and 80s, reduce tax-driven volatility when required minimum distributions begin, and preserve a legacy for his heirs. He wanted to avoid a large ordinary-tax event on the entire 401(k) distribution and preferred capital-gains treatment where possible.

The strategy chosen

John and his financial team implemented a multipart plan over the 12 months after his separation of service:

  1. Take an eligible lump-sum distribution of the employer plan and elect the NUA treatment on the company stock portion.
  2. Roll the non-stock portion ($330,000) directly to a traditional IRA.
  3. Convert $50,000 per year from the traditional IRA to a Roth IRA using partial conversions during low-income years (2026–2028) until his taxable income bracket rose, supplementing with a backdoor Roth for future contributions.
  4. Delay claiming Social Security until 70 to increase guaranteed benefit and provide flexibility for taxable conversion windows.
  5. Sell company stock progressively from the taxable account (subject to long-term capital gains) to fund living expenses and keep IRA required minimum distribution impacts minimized.

Why NUA?

NUA is a specialized tax rule allowing the net unrealized appreciation of employer securities distributed from a qualified plan in a lump-sum distribution to be taxed at long-term capital gains rates when the stock is later sold, while the stock’s cost basis is taxed as ordinary income in the year of the distribution. This can be materially advantageous when the appreciation is large (as in John’s $600,000 stock with $60,000 basis) and when the taxpayer can spread or time the ordinary-income recognition to lower-bracket years.

Numbers and tax mechanics

On the lump-sum distribution, John recognized ordinary income only on the stock’s cost basis, $60,000, and paid ordinary tax on that amount in the year of the distribution. The remaining $540,000—the NUA—was not taxed as ordinary income; it would be taxable at long-term capital gains rates when he sold shares from the taxable account.

The $330,000 rolled to a traditional IRA remained tax-deferred. By executing $50,000 per year Roth conversions while his taxable income was modest (because he delayed Social Security and drew modestly from taxable accounts), John minimized taxes on conversions and lowered the future RMD base. With the RMD age set at 73 under current law, the strategy bought time to perform conversions before RMDs began shaping his marginal tax rates.

Outcomes after five years

  • Tax-efficient capital gains: When John sold $150,000 of the company stock (long-term holdings) in year two, he paid long-term capital gains tax on $135,000 (NUA portion), not ordinary income on $150,000. This saved roughly several percentage points in tax compared with ordinary income treatment.
  • Smaller RMD base: Rolling only $330,000 into the IRA and converting portions to Roth reduced the traditional IRA balance subject to RMDs at age 73, limiting forced taxable withdrawals when tax brackets could be higher.
  • Higher lifetime Social Security: Delaying Social Security to 70 increased John’s Social Security income by roughly 24–32% depending on his PIA, providing a larger guaranteed income floor and allowing flexibility with taxable withdrawals.
  • Legacy and flexibility: The Roth IRA that grew from conversions provides tax-free inheritance options for heirs; taxable accounts hold the employer stock, exposing heirs to stepped-up basis rules if John dies before selling all shares.

Key trade-offs and constraints

This strategy was not without costs or restrictions:

  • Eligibility for NUA requires an eligible lump-sum distribution after separation from service and specific plan conditions. Not every plan or participant qualifies.
  • Ordinary-income tax on the stock cost basis occurs in the distribution year; John needed cash or liquidity to pay that tax without touching retirement assets in ways that would undermine the plan.
  • Taking a lump-sum can eliminate certain plan protections (like anti-spreading of creditor protection) and removes the flexibility of staying inside the employer plan.
  • Market risk: Holding concentrated employer stock in a taxable account exposes John to single-stock risk; his plan included a staged selling schedule to limit this exposure.
  • RMD rules (age 73 as of 2026) still apply to the remaining traditional IRA balances; NUA reduces but does not eliminate RMD exposure from other retirement assets.

Lessons for retirement-planning enthusiasts

The case yields several practical takeaways for readers:

  1. Consider NUA when employer stock is highly appreciated. For large unrealized gains, NUA can turn ordinary-income tax into long-term capital gains on the appreciation—often a material tax saving.
  2. Coordinate NUA with IRA rollovers and Roth planning. Moving non-stock amounts into an IRA and staging Roth conversions while taxable income is low reduces the future RMD base and tax exposure.
  3. Timing Social Security matters. Delaying to 70 raised guaranteed income and opened low-tax windows for conversions before RMDs began at 73.
  4. Watch liquidity needs and capital gains timing. You’ll owe ordinary income tax on the stock’s basis in the distribution year and long-term capital gains when selling—plan cash flow to cover taxes.
  5. Evaluate concentration risk. Stagger sales of company stock to reduce single-stock exposure while managing capital-gains realization and tax brackets.

When NUA is not optimal

NUA can be unattractive if the stock’s cost basis is high relative to market value, if the taxpayer will be in a high ordinary-income bracket that year, or if the plan participant needs creditor protection that the qualified plan provides. Also, younger retirees or those without a separation-of-service trigger should evaluate alternatives.

Conclusion

John’s outcome illustrates how combining a specific tax rule (NUA) with traditional IRA rollovers, Roth conversions, and Social Security timing can reshape a retirement income picture. The result was an after-tax income stream that relied more on capital gains and Roth tax-free withdrawals and less on larger taxable RMDs. This is not a universal prescription—eligibility rules, market exposures, and individual tax situations differ—but the case clarifies why NUA deserves a spot on the checklist for retirees holding large positions of employer stock inside a 401(k).

For retirement-planning enthusiasts, the greater lesson is to inventory account types (401k, IRA, Roth IRA, pension) and coordinate distribution tax treatments with Social Security timing and RMD rules. Where legal and feasible, specialized strategies such as NUA can convert a concentrated retirement-asset problem into a tax-managed solution.