If your 401(k) holds significant company stock that has grown substantially in value, there is a tax strategy you may not have heard of: Net Unrealized Appreciation, or NUA. Used correctly, NUA lets you convert what would otherwise be ordinary income into long-term capital gains — potentially saving a significant amount in taxes.
What Is Net Unrealized Appreciation?
Net Unrealized Appreciation is the difference between the cost basis of company stock in your 401(k) — what the company paid to put it there, or what you paid to acquire it inside the plan — and the current fair market value of that stock at the time of distribution.
Normally, every dollar withdrawn from a 401(k) is taxed as ordinary income at your marginal rate. But NUA treatment lets you take company stock out of the 401(k) in-kind (as shares, not cash), pay ordinary income tax only on the original cost basis, and then pay the lower long-term capital gains rate on the NUA — the appreciation — when you eventually sell the shares.
A Simple Example
Suppose your 401(k) contains 1,000 shares of your company’s stock. The company contributed those shares at an average cost basis of $10 per share ($10,000 total). Today, those shares are worth $80 per share ($80,000 total). Your NUA is $70,000.
With NUA treatment:
- You pay ordinary income tax on the $10,000 cost basis in the year of distribution
- The $70,000 NUA is not taxed at distribution — you report it only when you sell the shares
- When you sell the shares, the NUA is taxed at long-term capital gains rates (0%, 15%, or 20%), regardless of how long you hold them after distribution
Who Benefits Most From NUA?
NUA is most valuable when:
- The company stock has a very low cost basis relative to its current value
- Your ordinary income tax rate is significantly higher than your long-term capital gains rate
- You do not need the stock immediately and can plan the distribution strategically
The Lump-Sum Distribution Requirement
To use NUA treatment, you must take a lump-sum distribution of your entire 401(k) plan balance in a single tax year. You cannot cherry-pick just the company stock.
You can roll the non-stock portion of the 401(k) into an IRA to avoid paying tax on it immediately, while taking the company stock out in-kind. The rollover is not a distribution, so it does not trigger tax. But you must do both in the same tax year and your account balance must be $0 in the plan at year end.
NUA treatment is available only after certain triggering events: reaching age 59½, separating from service (leaving the employer), disability, or death.
Step-by-Step: How to Execute an NUA Distribution
- Confirm the cost basis. Contact your 401(k) plan administrator and request the cost basis of your company stock holdings.
- Calculate the NUA. Subtract the cost basis from the current market value.
- Run the tax comparison. Compare what you would pay using NUA strategy against a standard IRA rollover. A CPA can model this.
- Trigger the lump-sum distribution. Work with your HR department and plan administrator to request an in-kind distribution of the company shares to a taxable brokerage account while rolling remaining plan assets to an IRA in the same tax year.
- Report correctly on your return. Your plan administrator will issue a 1099-R with the NUA shown in Box 6. Make sure your tax preparer understands how to report NUA treatment correctly.
Risks and Considerations
Concentration risk. Holding a large percentage of wealth in a single company’s stock is risky. Once the shares are in a taxable account, you can diversify — but any sale will trigger taxes.
The comparison matters. NUA does not automatically win. If your ordinary income rate in retirement is similar to your long-term capital gains rate, or if the NUA amount is small, the benefit may be minimal. Always model both scenarios.
Medicare surtax. High earners may owe an additional 3.8% Net Investment Income Tax on capital gains. Factor this into your analysis.
Bottom Line
Net Unrealized Appreciation is a valuable — but rarely used — tax strategy for employees who hold highly appreciated company stock inside their 401(k). By distributing shares in-kind and converting the appreciation from ordinary income tax rates to long-term capital gains rates, you can save significantly on taxes. Work with a CPA who understands the NUA rules before executing this strategy.