Net Unrealized Appreciation: The Tax Strategy for Company Stock in Your 401(k)

If you hold your employer’s stock inside a 401(k) or other qualified retirement plan, a little-known tax rule could save you a significant amount of money. Normally, every dollar you withdraw from a traditional 401(k) is taxed as ordinary income. But the net unrealized appreciation (NUA) rules allow the growth on employer stock to be taxed at long-term capital gains rates instead, if you follow a specific process. This guide explains how NUA works, who qualifies, and when it makes sense.

What net unrealized appreciation means

Net unrealized appreciation is the difference between:

The cost basis of employer stock inside your plan, meaning what the plan paid for the shares, and
The market value of the shares when they are distributed to you.

For example, if your plan bought company shares for $50,000 over the years and they are worth $300,000 when distributed, the NUA is $250,000.

How the NUA tax treatment works

When you take an eligible distribution of employer stock in kind, meaning the actual shares are moved to a taxable brokerage account rather than sold or rolled into an IRA:

The cost basis is taxed as ordinary income in the year of the distribution. If you are under age 55 at separation from service, or under 59½ in some cases, the 10% early withdrawal penalty may apply to the basis amount.
The NUA is not taxed at distribution. It is taxed at long-term capital gains rates when you sell the shares, regardless of how long you hold them after distribution.
Any additional growth after distribution is taxed as short-term or long-term capital gain depending on how long you hold the shares after the distribution.

Long-term capital gains rates are 0%, 15%, or 20%, depending on taxable income, plus the 3.8% net investment income tax for higher earners on some gains. Ordinary income rates top out at 37%. That difference is the potential benefit.

Requirements for NUA treatment

NUA treatment applies only to a lump-sum distribution after a triggering event.

Triggering events

Separation from service (for employees)
Reaching age 59½
Death
Disability (for self-employed individuals)

Lump-sum distribution rules

A lump-sum distribution means the entire balance of all of your accounts in the employer’s qualified plans of the same type must be distributed within a single tax year. You do not have to take every asset as stock; you can roll the non-stock portion into an IRA and move the employer stock to a taxable account. But the whole account must leave the plan within one calendar year after the triggering event.

Taking a partial distribution earlier in the year, or a required distribution, can complicate eligibility. Plan carefully and coordinate with your plan administrator.

A worked example

Linda retires at 60 with a $900,000 401(k). It includes employer stock worth $400,000 with a cost basis of $80,000.

Option 1: Roll everything into an IRA. No immediate tax. Later withdrawals of the $400,000 stock value are taxed as ordinary income. If Linda is in the 24% bracket, that is roughly $96,000 in federal tax on the stock portion over time, assuming the bracket holds.

Option 2: Use NUA. Linda rolls the $500,000 of non-stock assets into an IRA and transfers the shares to a brokerage account. She pays ordinary income tax on the $80,000 basis this year, about $19,200 at 24%, ignoring bracket creep. When she sells the shares, the $320,000 of NUA is taxed at 15%, or $48,000. Total federal tax on the stock is about $67,200, compared with about $96,000.

The actual result depends on her brackets, state taxes, timing, and whether a higher income in the distribution year pushes her into higher brackets. This is why NUA calculations should be done carefully.

When NUA makes the most sense

Low cost basis relative to market value. The larger the NUA compared with the basis, the more valuable the strategy.
You expect to be in a high ordinary income bracket in retirement.
You plan to sell shares at some point and want capital gains treatment.
You need taxable funds without large ordinary income from IRA withdrawals.

When NUA may not make sense

High cost basis. If the basis is close to market value, paying ordinary income tax up front offers little benefit.
Early-withdrawal penalty. If the 10% penalty applies to the basis, the advantage shrinks.
Concentration risk. Holding a large position in one company’s stock is risky. Many people diversify soon after distribution, which is fine under NUA because the NUA portion is taxed as long-term gain anyway.
Estate planning. NUA does not receive a step-up in basis at death. Heirs who inherit shares pay capital gains tax on the NUA when they sell, though growth after distribution may receive a step-up.
State taxes. Some states tax capital gains as ordinary income, reducing the benefit.

How to execute an NUA distribution

Confirm eligibility and that a triggering event has occurred.
Request the cost basis of your employer stock from the plan administrator.
Plan the timing so the entire plan balance is distributed in one tax year.
Instruct the plan to distribute employer shares in kind to a taxable brokerage account and roll other assets into an IRA.
Avoid selling shares inside the plan before distribution; once sold, NUA is lost.
Report correctly. The plan issues Form 1099-R, with the NUA amount shown in box 6. Keep records of basis for future sales.

Partial strategies

You do not have to use NUA on all of your employer shares. You can choose to distribute only the shares with the lowest basis in kind and roll higher-basis shares into the IRA. Some plans track basis by lot, which makes this possible.

Getting professional help

Because NUA is irreversible and depends on precise plan procedures, many people work with a tax professional or financial planner. Mistakes, such as missing the single-year lump-sum requirement or rolling shares into an IRA first, can eliminate the benefit permanently.

NUA and required minimum distributions

Shares moved to a taxable account under NUA are no longer in a retirement account, so they are not subject to required minimum distributions. That can reduce future RMDs from your IRA, since the IRA balance will be smaller. On the other hand, dividends on the shares held in a taxable account are taxed each year, which does not happen inside an IRA. Qualified dividends are taxed at the same favorable rates as long-term capital gains.

NUA and charitable giving

Some retirees donate appreciated shares held in a taxable account to charity. Donating shares that carry NUA can avoid capital gains tax on that appreciation, and itemizers may deduct the fair market value subject to income limits. Others use a donor-advised fund to bunch gifts. Because the rules for gifts of appreciated property have percentage limits and holding-period requirements, confirm the details with a tax advisor before giving.

Frequently Asked Questions

What is net unrealized appreciation?

It is the increase in value of employer stock held in a qualified retirement plan, measured as the difference between the plan’s cost basis and the market value at distribution.

How is NUA taxed?

The cost basis is taxed as ordinary income at distribution, while the NUA is taxed at long-term capital gains rates when shares are sold.

Can I use NUA after rolling stock into an IRA?

No. Once employer stock is rolled into an IRA, the NUA opportunity is lost.

Do I have to take all of my 401(k) at once?

The entire plan balance must leave the plan in one tax year, but you can roll the non-stock portion into an IRA.

Do heirs get a step-up in basis on NUA shares?

No. NUA does not receive a step-up in basis at death, though post-distribution gains may.

This article is for general informational purposes only and is not legal, medical, tax, or financial advice. Rules vary by state and change over time; confirm details with the relevant agency or a licensed professional.