NUA: the company-stock tax break most rollovers destroy

1. The rollover that overpays

At retirement, almost everyone rolls their 401(k) into an IRA. It’s usually the right call — except for one specific asset: highly appreciated employer stock. Roll that into an IRA along with everything else, and every future dollar it produces comes out as ordinary income, taxed at rates up to 37%. For someone sitting on company stock that’s grown for decades, that’s the single most expensive default in retirement planning — and once the shares are in the IRA, there is no way to undo it.

The alternative is a one-time election written into the tax code precisely for this situation: Net Unrealized Appreciation. Used correctly, it converts the bulk of that future tax bill from ordinary-income rates to long-term capital-gains rates. The savings can clear $50,000, $100,000, or more. Used incorrectly — or skipped by accident — the opportunity is simply gone.

2. What NUA actually is

Net Unrealized Appreciation is just the growth of employer stock inside your plan. Two numbers define it:

The cost basis is what the shares cost when they went into the plan — the average price they were bought at over your career. The market value is what they’re worth when you distribute them. The NUA is the difference. If your shares cost $10 and are now worth $50, the NUA is $40 per share.

The whole strategy hinges on taxing those two pieces differently. Under IRC §402(e)(4), when you take the stock out properly, only the basis is taxed as ordinary income up front — the appreciation waits, and is taxed at the gentler capital-gains rate later. The more of the position that is appreciation rather than basis, the more powerful the move.

3. The bifurcated tax treatment

Here’s the mechanic in motion. You take a lump-sum distribution and move the employer shares in-kind (as shares, not cash) into a regular taxable brokerage account. Two tax events follow:

The remarkable part is the middle row: the NUA gets long-term capital gains treatment even if you sell the very next day. That’s the rate arbitrage. And the NUA itself is not subject to the 3.8% net investment income tax at distribution. Compare that to a rollover, where the same appreciation would eventually leave the IRA as ordinary income, and the gap is the entire point.

4. The four ironclad rules

NUA is unforgiving. Miss any one of these and you lose the election — sometimes permanently:

1. A triggering event. One of four must have happened: separation from service, reaching age 59½, disability, or death.
2. A lump-sum distribution. The entire vested balance of all same-type plans with that employer must be distributed in a single tax year. Start in December and finish in January and you’ve blown it.
3. In-kind transfer of the stock. The shares must move as shares to a taxable account. Sell them inside the plan first, and NUA is gone.
4. No disqualifying partial distribution. If you took a partial distribution after the triggering event, you’re disqualified until the next triggering event occurs.

5. NUA vs. rollover: run it

Enter your stock’s value, its cost basis, your ordinary tax rate, and your long-term capital-gains rate. The calculator shows the NUA path (ordinary tax on basis + capital gains on the appreciation) against rolling everything to an IRA (all of it eventually taxed as ordinary income), and the difference between them.

6. When NUA wins — and when it doesn’t

NUA is a scalpel, not a hammer. It shines when three things line up: a low cost basis relative to market value (often under about 25–30%), a high ordinary tax bracket, and a plan to sell within a reasonable timeframe. The textbook candidate is decades-old stock bought for pennies on the dollar, held by someone in the 32–37% bracket. The wider the gap between the ordinary rate and the capital-gains rate, the bigger the prize.

It works against you when the opposite is true. If the stock has only modestly appreciated, your ordinary rate is already low, or you intend to hold for decades, then paying ordinary tax now on the basis throws away years of tax-deferred compounding — and a plain IRA rollover comes out ahead over time. A common compromise captures the best of both: apply NUA only to your lowest-basis shares and roll the rest into an IRA, getting the favorable rate on the high-appreciation lots while keeping the rest deferred.

7. The traps that bite

Even when NUA is the right call, three details can erode or sabotage it:

• The 10% early-distribution penalty. The cost basis is taxed as ordinary income now — and if you separated from service before the year you turned 55 (or are otherwise under 59½), a 10% penalty can apply to that basis amount.
• The IRMAA spike. The basis income, plus any same-year stock sale, can balloon your modified adjusted gross income — and once you’re 63 or older, that triggers an IRMAA Medicare surcharge two years later. The 2026 thresholds start at $109,000 (single) and $218,000 (joint).
• The one-year timing. The lump-sum distribution must complete within a single calendar year. A distribution that spills across a year-end is disqualified.

A common way to soften the bill: do the in-kind distribution late in one tax year (locking in the NUA), then sell early the next year, splitting the cost-basis income and any sale gains across two tax years to stay under bracket and IRMAA thresholds.

8. The federal angle

One clarification feds need up front: NUA does not apply to the TSP. The Thrift Savings Plan holds index and lifecycle funds, not individual employer stock, so there’s nothing for the election to attach to. If your entire career has been federal and your savings sit in the TSP and IRAs, NUA simply isn’t in play.

Where it does matter for the federal community is the old private-sector 401(k). Many feds spent years in the private sector or as contractors before federal service and still hold a former employer’s plan with appreciated company stock — and a spouse may hold employer stock in a workplace plan too. The warning is the same one that opens this guide: before you consolidate that old account by rolling it into an IRA, check NUA first. The rollover is the most natural housekeeping move in retirement, and it’s exactly the move that destroys this break. Fit the decision into your broader picture of how retirement income is taxed before you touch the shares.

9. Frequently asked questions