Net Unrealized Appreciation (NUA)
Net Unrealized Appreciation (NUA) is the difference between the original cost basis of employer stock held inside a qualified retirement plan and the stock's fair market value at the time of a lump-sum distribution. Under a special IRS rule, the NUA portion of that distribution is taxed as long-term capital gain rather than ordinary income, potentially producing significant tax savings for employees who have accumulated highly appreciated employer shares in a 401(k) or ESOP.
Most retirement plan distributions are taxed as ordinary income at the participant's marginal rate, which can reach 37% under 2025 federal tax law. The NUA strategy carves out an exception specifically for employer securities distributed in kind as part of a qualifying lump-sum distribution. By taking the actual shares rather than cashing them out inside the plan, the employee receives capital gain treatment on the appreciation that built up while the stock was held in the plan.
To qualify for NUA treatment, several conditions must be met. The distribution must be a lump sum — meaning the entire account balance from all plans of the same type sponsored by the same employer must be distributed in a single tax year. A triggering event is required: the employee must have separated from service, reached age 59-1/2, died, or (for self-employed participants) become disabled. The employer securities must be distributed in kind, as actual shares, not as a cash equivalent.
The tax mechanics work as follows. The cost basis of the employer shares — what the plan originally paid for them — is included in ordinary income in the year of distribution. The NUA, meaning the amount by which the fair market value on the distribution date exceeds that basis, is not taxed at distribution. Instead, it is deferred and taxed as long-term capital gain when the shares are eventually sold, regardless of how long the employee holds the shares after the distribution. Any further appreciation after distribution date is also eligible for long-term capital gains rates if the employee holds the shares for more than one year.
The NUA strategy is most advantageous when the employer stock has a very low cost basis relative to its current value, when the employee's ordinary income tax rate is substantially higher than the long-term capital gains rate, and when the employee has immediate or near-term plans to sell the stock. Because the basis amount is taxed as ordinary income immediately, employees with high current income levels should model the upfront tax cost against the long-term benefit of capital gain treatment on the NUA.
Financial planners routinely compare rolling the employer stock into an IRA (deferring all tax) versus taking the NUA distribution. The IRA rollover route avoids any immediate tax but subjects all future distributions — including built-in gains — to ordinary income tax rates. The NUA route triggers ordinary income on just the basis portion now, but converts the built-in appreciation permanently to capital gain rates. State income tax treatment of NUA varies, so employees in high-tax states should evaluate the full federal and state picture before proceeding.