NUA: The 401(k) Rollover Mistake That Costs Real Money
Rolling every dollar of a 401(k) into an IRA feels like the safe default — but if part of it is your own employer's stock, that default can hand the IRS money you didn't have to give up.
By Megha Sharma, Licensed Life & Health Insurance Professional
When you leave a job, rolling your 401(k) into an IRA is the move almost everyone makes, almost automatically. If part of that 401(k) is your own employer's stock, that automatic move can quietly convert what should be a long-term capital gain into ordinary income — a materially worse outcome at tax time.
What NUA actually is
NUA stands for net unrealized appreciation — the difference between what you originally paid for the employer stock inside your 401(k) (its "cost basis") and what it's worth today. The NUA strategy lets you move those shares, in-kind, into a regular taxable brokerage account instead of an IRA.
When you do this, you pay ordinary income tax immediately, but only on your original cost basis — not on the full current value. The appreciation (the NUA itself) is taxed later, when you sell, at long-term capital gains rates — 0%, 15%, or 20% depending on income — even if you sell the very next day. Ordinary income tax rates can run well above capital-gains rates for many households, so the difference is not academic.
Why people miss it
Rolling everything into an IRA feels safer and simpler, and for the non-stock portion of a 401(k), it usually is the right call — it preserves tax deferral and avoids any immediate tax bill. But that same instinct, applied uniformly to employer stock, gives up the NUA opportunity permanently: once those shares are rolled into an IRA, any later withdrawal is taxed as ordinary income, at whatever rate applies at withdrawal, with no capital-gains treatment available.
The catches
NUA isn't available in every situation. It generally requires a lump-sum distribution of the entire 401(k) balance within one tax year, following a triggering event — separation from service, reaching 59½, disability, or death. And the decision is a one-way door: once the shares are rolled into an IRA, the NUA election is gone for good.
Whether NUA makes sense depends on how much appreciation is involved, your current and expected tax brackets, and how concentrated you're comfortable being in a single stock after the move — all of which is worth walking through with a tax professional before you initiate any rollover or distribution.