Net Unrealized Appreciation Strategy
The Net Unrealized Appreciation (NUA) strategy is a tax planning technique available to employees with employer stock inside a qualified retirement plan — such as a 401(k) — that allows the appreciation in value of that stock above its original cost basis (the NUA) to be taxed at long-term capital gains rates rather than ordinary income rates when the stock is distributed and later sold.
Most financial planning guidance recommends rolling 401(k) balances to an IRA upon leaving an employer, because the rollover is tax-free and preserves tax-deferred compounding. The NUA strategy is a notable exception that can produce dramatically lower taxes for employees who have accumulated substantial employer stock inside their plan and whose stock has appreciated significantly from its original cost basis.
The NUA rules under IRC Section 402(e)(4) work as follows. The employee must take a lump-sum distribution of the entire 401(k) balance in a single tax year following a triggering event — separation from service, reaching age 59.5, total disability, or death. The portion of the distribution consisting of employer stock is distributed in-kind (the actual shares, not cash). The cost basis of those shares — what the plan originally paid to acquire them — is taxable immediately as ordinary income in the year of distribution. However, the net unrealized appreciation — the difference between the current fair market value of the shares and the plan's cost basis — is not taxed at distribution. Instead, NUA is taxed at long-term capital gains rates when the stock is eventually sold, regardless of how long the investor holds the shares after distribution.
The tax math favors NUA when the plan's cost basis is low relative to the current stock price (meaning a large NUA exists) and when the employee's marginal ordinary income rate substantially exceeds the long-term capital gains rate. For a top-bracket investor in 2024 facing a 37% federal ordinary income rate, converting even a portion of a large 401(k) balance from ordinary income treatment to the 20% long-term capital gains rate on NUA — plus the 3.8% net investment income tax — produces a meaningful tax reduction.
The strategy has important limitations. The ordinary income tax on the cost basis portion is due immediately, which requires liquidity to fund the tax bill. The entire account balance must be distributed in a single year, which may push the investor into a higher bracket and increase the tax cost on non-stock plan assets (bonds, diversified mutual funds) that are distributed as cash and taxed as ordinary income. State income taxes also apply. The NUA strategy must be modeled carefully using current tax rates, projected future rates, and the investor's specific cost basis to determine whether it outperforms a straightforward IRA rollover. A qualified tax professional should always be involved in NUA planning given the complexity and irreversibility of the lump-sum distribution election.