Net Unrealized Appreciation
Net Unrealized Appreciation (NUA) is the difference between the cost basis of employer stock held in a 401(k) and its fair market value at the time of distribution, which can be taxed at favorable long-term capital gains rates rather than ordinary income tax rates if specific conditions are met.
Net Unrealized Appreciation is a tax strategy available to employees who hold appreciated employer stock inside their 401(k) or other employer-sponsored plan. Under normal circumstances, all distributions from a pre-tax 401(k) are taxed as ordinary income. The NUA rules create an exception: if you take a qualifying lump-sum distribution of employer stock, you pay ordinary income tax only on the stock's original cost basis inside the plan, while the appreciation (the NUA) is taxed at the more favorable long-term capital gains rate when the stock is eventually sold.
To qualify for NUA treatment, several requirements must be met: (1) you must take a lump-sum distribution, meaning the entire vested account balance from all plans of the same type with the same employer must be distributed within one calendar year; (2) the distribution must be triggered by a qualifying event — separation from service, reaching age 59½, death, or disability; and (3) the distribution must include actual shares of employer stock, not a cash equivalent.
The tax math illustrates the potential benefit powerfully. Suppose an employee received employer stock in their 401(k) with a cost basis of $50,000, and at the time of the lump-sum distribution the stock is worth $300,000. The employee pays ordinary income tax on $50,000 (the cost basis). The $250,000 of NUA is transferred to a taxable brokerage account and taxed at long-term capital gains rates (0%, 15%, or 20%) when sold — a significant savings compared to ordinary income rates (up to 37% federal in 2025).
NUA planning requires weighing multiple factors: the size of the NUA relative to the basis, the individual's expected tax brackets, the need to diversify concentrated stock risk, state income tax treatment, and the opportunity cost of not rolling assets to an IRA. The strategy is most beneficial when the NUA is very large relative to cost basis. A CPA or financial planner experienced in NUA can model the after-tax outcomes compared to a traditional rollover.