Net Unrealized Appreciation: the tax break for company stock in your 401(k)

Everything that leaves a Traditional 401(k) normally exits as ordinary income — up to 37% federal. Net Unrealized Appreciation is the exception: if you hold your EMPLOYER'S stock inside the plan, a special election lets all the growth on those shares be taxed at long-term capital gains rates (15–20%) instead. For long-tenured employees sitting on cheap, highly appreciated company shares, the spread between those two rates can be worth six figures. It's also the easiest major tax break to destroy by accident.

The mechanics

Your company shares have two components: cost basis (what the plan paid for them over the years) and NUA (the appreciation while inside the plan). In an NUA transaction, you distribute the shares in-kind to a regular taxable brokerage account. You pay ordinary income tax immediately — but only on the small cost basis. The NUA is taxed at long-term capital gains rates whenever you eventually sell, no matter how soon. Growth after the distribution follows normal holding-period rules.

• You must take a lump-sum distribution: the ENTIRE plan balance must leave the plan within one calendar year. The company shares go in-kind to taxable; everything else can roll to an IRA tax-free.
• It's only available after a triggering event: separation from service, reaching 59½, disability, or death.
• The shares must move in-kind — sold-then-transferred cash gets nothing.
• If you're under 55 at separation (or under 59½ without an exception), the 10% early-distribution penalty applies to the cost basis portion.
• NUA never gets a step-up at death, but heirs do inherit the capital-gains treatment.

When NUA wins — and when it loses

• Wins big: cost basis under ~25–30% of market value, a large dollar amount of NUA, near-term spending needs (money you'd withdraw soon anyway), and high ordinary brackets with modest capital gains rates.
• Loses: high basis relative to value (you're prepaying tax on basis for little benefit), money you'd leave compounding tax-deferred for decades, or a basis tax bill you can't comfortably pay.
• The hidden cost: NUA money in taxable loses tax deferral forever. For young retirees with decades of deferral ahead, rolling to the IRA and converting to Roth strategically often beats NUA. Run both.
• Partial NUA: you can elect NUA on some shares (the lowest-basis lots, if the plan tracks lots) and roll the rest — often the sweet spot.

Execution checklist

1. Call the plan and get your exact cost basis on the employer shares — this number decides everything, and only the plan has it.
2. Model both routes (NUA vs. full rollover, and partial NUA) including your bracket now, expected brackets later, RMD effects, and IRMAA.
3. Confirm a triggering event has occurred and NO distributions have been taken since — timing violations are unfixable.
4. In one calendar year: distribute employer shares in-kind to a taxable brokerage; direct-roll everything else to your IRA.
5. Verify the 1099-R shows the taxable amount (basis) and the NUA figure in box 6; keep it forever as proof of your basis.
6. Then manage the concentration: NUA is a tax strategy, not a reason to keep 40% of your net worth in one stock. Most retirees should sell down promptly — the capital gains rate applies immediately.

The decision inputs, quantified

A quick way to pre-screen before hiring anyone: multiply the stock's value by your expected ordinary rate in retirement, then compute basis times your current ordinary rate plus NUA times your capital gains rate. In Ray's case: $600,000 × 24% = $144,000 for the rollover path, versus $90,000 × 24% + $510,000 × 15% ≈ $98,000 for NUA — a $46,000 spread visible in thirty seconds of arithmetic. If the pre-screen shows a spread above five figures, the CPA engagement pays for itself; if the spread is marginal, the flexibility of the rollover usually wins, since IRA money can still be converted to Roth on your schedule while NUA's tax treatment is locked at distribution. Either way, the pre-screen only works with the true plan basis — call the administrator before believing any estimate.

The bottom line

NUA is a genuine arbitrage — the spread between your ordinary rate and the capital gains rate, applied to every dollar of in-plan appreciation — available only to people holding employer stock in a workplace plan, and only if the exit is choreographed correctly. Get the basis number, run it against a plain rollover, and above all: never let the shares touch an IRA until the decision is made. Six-figure tax breaks rarely hinge on one checkbox. This one does.