If you have worked for a company that offered its stock through a 401(k) or other employer retirement plan, you may be sitting on a tax opportunity that many employees never hear about. It is called Net Unrealized Appreciation, or NUA. Used correctly, it can lower the tax you pay on company stock when you retire or leave your employer. Used incorrectly, or without planning, it can cost you money. This article explains what NUA is, how it works, its advantages and drawbacks, and an example to make the numbers concrete.
What Is Net Unrealized Appreciation?
NUA is the increase in value of your company stock while it sat inside your employer plan. It is the difference between what you paid for the shares (their cost basis, which is generally the amount that was credited to your account when the shares were purchased) and their market value when they are distributed to you.
Normally, when you withdraw money from a 401(k), the entire amount is taxed as ordinary income. The NUA rules create an exception. If you take your company stock as an in-kind distribution into a taxable brokerage account, you pay ordinary income tax only on the cost basis. The appreciation, the NUA, is not taxed when you receive the shares. It is taxed later at long-term capital gains rates when you sell, no matter how long you hold the stock after the distribution. Long-term capital gains rates are generally lower than ordinary income rates.
How the Strategy Works
NUA is not automatic. It has specific requirements. The distribution must be a lump-sum distribution of your entire balance from all of the employer's qualified plans of the same type, completed within a single tax year. The triggering event must be one of the following: separation from service, reaching age 59½, disability, or death. The company stock must be moved in kind to a taxable brokerage account. Any other assets in the plan, such as mutual funds or bonds, can be rolled over to an IRA to preserve their tax deferral.
Because the rules are strict, the mechanics matter. A rollover error or a partial distribution can disqualify the strategy entirely, so coordination with your plan administrator, custodian, and tax professional is essential before any action is taken.
Potential Advantages
The main benefit is tax rate arbitrage. Appreciation that might otherwise be taxed at your ordinary income rate, which can reach 37% at the federal level, can instead be taxed at long-term capital gains rates of 0%, 15%, or 20%, depending on your income. For someone with a large amount of appreciated company stock, the difference can be substantial.
NUA can also make sense for people who want to keep a large position in their employer’s stock without paying as much tax as an IRA withdrawal would require. In an IRA, every dollar you eventually withdraw is taxed as ordinary income, including the growth in a stock that has appreciated significantly. With NUA, that growth is deferred and taxed at long-term capital gains rates when you sell. This can matter most for employees whose company stock has grown well beyond their original investment. Because the NUA isn’t taxed until you sell, you also control when that tax is paid, which gives you flexibility to spread the sales across several tax years and manage your overall tax bracket.
Finally, if you separate from service in the calendar year you turn 55 or later, you successfully unlock the Rule of 55. This completely eliminates the 10% early withdrawal penalty on the cost basis of the stock, making the NUA strategy far more attractive. You will still owe ordinary income tax on the cost basis of the company stock in the year of the distribution, but the 10% penalty, which normally applies to distributions from a qualified retirement plan prior to age 59.5 does not apply.
Note that if you separate before 55, the penalty can apply to the basis portion you take as ordinary income, unless another exception applies. The NUA itself is not subject to the 10% penalty, because it isn’t taxed as ordinary income when distributed.
Potential Drawbacks
NUA is not a fit for everyone. The lump-sum requirement means you must take your entire plan balance in one tax year, which can be a significant change if you prefer to keep all the assets in the plan tax-deferred. The basis portion is taxed as ordinary income immediately, so if your cost basis is high relative to the stock's value, the benefit shrinks. If the stock declines after distribution, the NUA shrinks accordingly, since it is taxed only when you sell. The cost basis tax, however, was already owed in the year of distribution, so a decline can leave you paying tax on a value you no longer have. Also, holding a large position in one company carries concentration risk, which is a financial issue separate from taxes.
There are other considerations as well. The NUA portion does not benefit from the step-up in basis that heirs typically receive at death. Although this is a potential drawback for the taxation of the NUA portion, it is still often more advantages for heirs to inherit these shares from a taxable brokerage account rather than an IRA, given the ordinary income tax rates for IRA distributions and the 10-Year rule for inherited IRAs to non-spouses. Note that any additional growth to the stock after you move it from the 401(k) to a taxable investment account does qualify for a full step-up in basis. And if the stock is sold within a year of distribution, any gain above the NUA is taxed as short-term gain at ordinary rates.
An Example
Suppose you have worked for your employer for 25 years and your 401(k) holds company stock with a cost basis of $20,000. When you retire, the shares are worth $120,000, so your NUA is $100,000. You take the stock as an in-kind distribution into a brokerage account and roll the rest of your plan into an IRA. You pay ordinary income tax on the $20,000 basis in the year of distribution. Assume a 32% bracket, so that is $6,400.
A year later, you sell the shares for $150,000. The $100,000 NUA is taxed at 15%, costing $15,000. The additional $30,000 of growth after distribution is also long-term and taxed at 15%, costing $4,500. Your total tax is $25,900, leaving you with $124,100.
Compare that with rolling the full $120,000 into an IRA and later withdrawing $150,000 at a 32% rate. The tax would be $48,000, leaving $102,000. In this scenario, NUA leaves you roughly $22,000 better off. Your actual results will vary with your tax bracket, state taxes, the Net Investment Income Tax of 3.8% that may apply at higher incomes, and how the stock performs.
Your actual results will vary with your tax bracket, state taxes, the Net Investment Income Tax of 3.8% that may apply at higher incomes, and how the stock performs.
| Scenario | Approximate net to you |
|---|---|
| NUA strategy: tax on basis, NUA, and post-distribution gain (about $25,900 total) | $124,100 |
| IRA rollover: full $150,000 withdrawn at 32% (about $48,000 tax) | $102,000 |
Note: Illustrative example only; actual results will vary.
Is NUA Right for You?
NUA can be a powerful tool, but it depends on your cost basis, your tax situation, your need for the stock, your timeline, and your estate goals. A financial planner can model the scenarios side by side, coordinate with your tax advisor, and help you decide whether the strategy fits your broader retirement and legacy plan.
This article is for general educational purposes and does not constitute tax, legal, or investment advice. Tax laws change, and individual results vary. Consult a qualified tax professional before making decisions about employer stock or retirement plan distributions.