What it is
TL;DRNUA lets an employee who holds appreciated employer stock inside a 401(k) move that stock in-kind to a taxable brokerage account during a qualifying lump-sum distribution, paying ordinary income tax only on the stock's original cost basis. All the appreciation is taxed later, at long-term capital-gain rates, when the shares are sold.
Normally, every dollar that comes out of a traditional 401(k) is ordinary income, the worst rate in the code. NUA carves out a major exception specifically for employer stock that has grown substantially inside the plan.
The classic candidate is a long-tenured employee at a company whose stock was acquired cheap and is now worth many multiples of its basis, think a 30-year employee whose plan holds $600k of stock with a $90k cost basis.
Who it's for
Employees separating from service (retirement, layoff, reaching 59½) who hold highly appreciated employer stock inside a qualified plan.
- ✓Long-tenured employees with low-basis, high-value employer stock in a 401(k)
- ✓Retirees facing a triggering event (separation, death, disability, age 59½)
- ✓Anyone whose stock appreciation dwarfs its original cost basis
- ×Employees whose stock basis is close to its current value (little NUA to harvest)
- ×People who already rolled the stock to an IRA (NUA is permanently lost)
- ×Holders of mutual funds or non-employer securities (NUA applies only to employer stock)
How it works
1. Confirm a qualifying triggering event
NUA requires a lump-sum distribution of the entire vested plan balance within a single tax year, triggered by separation from service, reaching 59½, death, or disability.
Take it in-kind: the employer stock transfers as shares to a taxable brokerage account; the rest of the plan can roll to an IRA.
2. Pay ordinary tax on basis only
In the distribution year you report ordinary income equal to the plan's cost basis in the stock, not its market value. The unrealized appreciation is excluded from ordinary income.
3. Hold the appreciation for capital-gain treatment
The NUA built up inside the plan is automatically long-term, regardless of how long you hold the shares after distribution. Any additional growth after distribution follows normal short/long-term rules.
The single most expensive NUA mistake is rolling the employer stock into an IRA. The moment it lands in an IRA, the appreciation is locked into ordinary-income treatment forever. NUA must be elected on the way out.
4. Layer in charitable or estate planning
Low-basis NUA shares are excellent candidates for donor-advised funds or a charitable remainder trust, and they receive a partial step-up at death (the NUA portion does not step up, but post-distribution growth does).
A worked example
Gary retires from a manufacturer after 28 years. His 401(k) holds $620,000 of company stock with a $85,000 cost basis. The rest of his plan ($400k) rolls to an IRA. He uses NUA on the stock instead of rolling it all over.
| Roll everything to IRA | NUA election on stock | |
|---|---|---|
| Ordinary income recognized now | $0 (deferred) | $85,000 (basis) |
| Future tax rate on $535k appreciation | Ordinary (up to 37%) | LTCG (15-20%) |
| Tax on the appreciation (eventual) | ≈ $198,000 | ≈ $107,000 |
| Plus current tax on basis (24%) | $0 | ≈ $20,400 |
| Lifetime tax saved on the stock | ≈ $70,000 |
By paying ordinary tax on $85k now and capital-gain rates on the $535k of appreciation later, Gary saves roughly $70,000 versus the all-IRA rollover, and he gains flexibility to sell shares gradually or gift them.
Limits and risks
NUA is all-or-nothing on timing: miss the lump-sum-in-one-year requirement, take a partial distribution that breaks the rule, or roll the stock to an IRA, and the election is gone.
Concentration risk is real. Holding a single appreciated stock for tax reasons can backfire if the company falters; the tax tail should not wag the diversification dog.
If you're under 59½ at distribution, the basis portion may also face the 10% early-withdrawal penalty.
NUA itself is well-settled and rarely contested, but the plan administrator's cost-basis figure must be documented. Keep the Form 1099-R (which should show the NUA in box 6) and the plan's basis records; reconstructing basis years later is painful.
IRS reference
- IRC §402(e)(4)Defines net unrealized appreciation and the special tax treatment for employer securities.
- Rev. Rul. 81-122Cost basis is the value of the stock when contributed to the plan.
- IRC §402(e)(4)(D)Lump-sum distribution requirements that must be met to use NUA.