Net Unrealised Appreciation

The net unrealised appreciation (NUA) election is a specialised but powerful tax rule that applies when you receive a lump-sum distribution of employer stock from a 401(k) plan or similar qualified retirement account. It allows you to pay capital gains tax on the appreciation that occurred while the stock was held in the plan, rather than ordinary income tax — a treatment that can save tens of thousands of dollars if the appreciation is large.

The split: ordinary on basis, capital gains on appreciation

NUA creates a two-layer tax treatment on employer stock. When you receive a lump-sum distribution of company stock, the cost basis of that stock (the amount contributed or the purchase price within the plan) is taxed as ordinary income in the year of distribution. But the appreciation — the net unrealised appreciation from that cost basis to the fair-market value on the distribution date — qualifies for long-term capital gains treatment.

Suppose you have accumulated 1,000 shares of your employer’s stock in your 401(k), purchased at an average cost of $50 per share ($50,000 total basis). On the distribution date, those shares are worth $150 per share ($150,000 fair-market value). The net unrealised appreciation is $100,000.

In the year you take the distribution, you will owe ordinary income tax on $50,000 (your cost basis). The $100,000 appreciation, however, is taxed as a long-term capital gain when you eventually sell the shares — either immediately after distribution or years later. If you are in the 37% ordinary-income bracket and the long-term capital gains rate is 20%, this choice saves 17 percentage points on the appreciation portion, or $17,000 in this example.

Why NUA matters for concentrated positions

NUA is particularly valuable for employees whose wealth is heavily concentrated in employer stock. This can occur at founder-led companies where employees have received stock options or restricted stock awards, or in long-standing public companies where employees have accumulated shares through 401(k) contributions and employer matches.

Without NUA, a concentrated position would be taxed entirely at ordinary income rates on distribution, creating a massive tax bill. With NUA, the appreciation escapes the higher rate, and the employee can choose when to realise that gain by selling — potentially deferring it to a year when they are in a lower bracket, or spreading sales over multiple years.

The lump-sum distribution requirement

NUA is only available if you take a lump-sum distribution. A lump-sum distribution is defined as a distribution of your entire balance in a plan account within a single tax year (or, in some cases, within a short time window). It is not available for periodic distributions, partial withdrawals, or rollovers to another plan.

This is a crucial constraint. If you roll your 401(k) into an IRA, you lose the NUA election forever. Many advisors recommend evaluating NUA before rolling funds to an IRA. Some employees choose not to roll over employer stock specifically to preserve the NUA option.

The election is irrevocable

Once you take a lump-sum distribution and elect NUA treatment, the election is irrevocable. You cannot change your mind in a later year if the stock declines in value. Similarly, if the stock appreciates further after distribution, that post-distribution appreciation is not eligible for long-term capital gains treatment (unless and until you meet the one-year holding period requirement on the post-distribution gain). The one-year clock resets on the distribution date.

This permanence creates a planning opportunity. If you receive a distribution of employer stock near the end of the year, you can hold it into the next calendar year to qualify for long-term capital gains treatment on any appreciation after the distribution date, then sell in year two, capturing both the NUA benefit and the post-distribution appreciation at capital-gains rates.

Step-up in basis and inherited employer stock

An interesting edge case arises with inherited employer stock. If a 401(k) participant dies before taking a distribution, and the heir receives a distribution of employer stock from the plan, the heir can elect NUA treatment. The fair-market value of the stock on the decedent’s death becomes the cost basis for NUA purposes, and the heir qualifies for long-term capital gains treatment on that amount.

This is powerful: the heir receives a step-up in basis, and the NUA election applies from the stepped-up basis, effectively wiping out all pre-death appreciation from the ordinary-income tax base.

Planning coordination with other retirement-income rules

NUA planning must be coordinated with other considerations. A large lump-sum distribution may trigger unexpected ordinary-income tax on the cost basis, pushing the taxpayer into a higher bracket. Net operating losses, the alternative minimum tax, or state income tax implications may affect the decision to take a distribution in a given year.

Some employees use a staged approach: take a lump-sum distribution in a low-income year (say, upon retiring mid-year), elect NUA, and then sell the employer stock gradually over the next several years, spreading the long-term capital gains realisations across multiple tax years to stay in a lower bracket.

Who should not elect NUA?

NUA does not make sense if the stock is trading at a loss, or if the appreciation is minimal. In those cases, rolling the stock into an IRA and selling it inside the IRA (in a Roth conversion context) may be more tax-efficient. Similarly, if you intend to hold the stock indefinitely and never realise the gain, the tax deferral of non-realised appreciation inside a Roth conversion or lifetime hold may outweigh the benefit of the capital-gains rate.

See also