Net Unrealized Appreciation (NUA) Strategy

What if you could pull your most-appreciated retirement asset out and have its growth taxed at capital-gains rates instead of ordinary income? If you hold your employer’s stock inside your 401(k), you may be able to, through a rule called net unrealized appreciation. It’s one of the few ways to turn ordinary-income dollars into lower-taxed capital-gains dollars, and it only works in a tight set of circumstances.

The setup

Net unrealized appreciation, or NUA, is the difference between what your company stock cost when it went into your 401(k) and what it’s worth now. Say you accumulated employer shares over a career for $200,000 and they’re now worth $1,000,000. The $800,000 of growth is your NUA.

Normally, every dollar that comes out of a 401(k) is ordinary income, taxed at your regular rate. NUA breaks that rule for company stock. If you do it right, you pay ordinary income tax only on the original cost, the $200,000 basis, and the $800,000 of growth gets taxed at long-term capital-gains rates when you sell, which are lower than ordinary rates for most affluent households.

How the move works

The mechanics are strict, and one wrong step blows the whole thing up:

• You transfer the company stock in kind, as actual shares, into a regular taxable brokerage account, not into an IRA.
• You pay ordinary income tax now on the cost basis.
• The rest of your 401(k), the non-company assets, rolls to an IRA as usual.
• It must be done as part of a lump-sum distribution, emptying the plan in a single tax year, triggered by a qualifying event like leaving the job or turning 59½.

Roll the company stock into an IRA by mistake and you forfeit NUA forever. From then on it’s all ordinary income, the very outcome you were trying to avoid.

The hidden price: a tax bill up front and concentration risk

NUA looks like a clean win until you weigh what it costs. Two things. First, you owe ordinary income tax on the basis right now, in the year of the distribution, instead of deferring it. Second, and bigger, you’re choosing to keep a large, concentrated position in a single stock, your former employer’s, sitting in a taxable account. That’s the same illiquid, single-bet concentration that wrecks people when the one company stumbles. The tax saving is real, and so is the risk you take on to capture it. A tax break is a bad reason to bet your retirement on one company’s share price.

There’s also a timing question against the alternative. Leave the stock in the plan and your heirs don’t get a step-up in basis on it the way they would on stock held in a taxable account, which interacts with NUA in ways worth modeling before you commit.

When it tends to make sense

NUA favors a specific profile: a large gap between basis and current value (high appreciation on a low cost), a tax rate where the ordinary-versus-capital-gains spread is wide, and a willingness to diversify out of the position over time once it’s in the taxable account. The lower your basis relative to value, the stronger the case.

For higher-net-worth households

This is exactly the kind of decision where the tax tail can wag the dog. The arithmetic often favors NUA, but only if you treat the concentrated stock as something to unwind on a plan, not a position to marry because selling it triggers gains. Coordinate it with the rest of your exit: your withdrawal order, any Roth conversions, and the income thresholds that drive your Medicare surcharges. Run the numbers, capture the break if it’s real, then diversify. Don’t let a good tax move quietly become a bad investment one.