What is Net Unrealized Appreciation (NUA)? 401(k) Guide
If you retired, changed employers, or turned 59½ with a large slug of company stock inside a 401(k) or other qualified plan, the default advice is to roll everything into an IRA. That is often wrong. A one-time federal election called net unrealized appreciation can convert most of that gain from ordinary income into long-term capital gains — and it can only be captured at the moment you take the distribution.
At SW Accounting & Consulting Corp, we advise Los Angeles executives, physicians, and long-tenured employees who accumulate concentrated employer stock inside qualified plans. Below is how the NUA rules under IRC §402(e)(4) actually work, when the numbers favor the election, and the mistakes that void it.
What is net unrealized appreciation, exactly? 📈
Net unrealized appreciation is the built-in gain on employer securities held inside a qualified retirement plan — the difference between the plan’s cost basis in the shares and their fair market value on distribution.
Congress created the NUA rule so employees compensated with company stock inside a qualified plan would not be pushed into top ordinary rates simply because their employer stock appreciated for decades. The statute is Internal Revenue Code §402(e)(4)(B), and the IRS explains it in Publication 575, Pension and Annuity Income.
When the election applies, the plan’s cost basis in the employer securities is taxed as ordinary income in the year of distribution, but the appreciation above that basis (the NUA) is not taxed until you sell the stock — and then it is taxed at long-term capital gains rates, regardless of how long you personally hold the shares after distribution.
How does the net unrealized appreciation strategy work step by step? 🧭
You take a lump-sum distribution from the plan within one tax year, move the employer stock in-kind to a taxable brokerage account, and roll the non-stock investments into an IRA.
Publication 575 walks through the mechanics; the practical sequence looks like this:
- Confirm a triggering event. The plan must permit a lump-sum distribution because of separation from service, reaching age 59½, death, or disability — the categories listed in IRC §402(e)(4)(D).
- Distribute the entire plan balance in one tax year. Everything credited to your account under all similar plans of the employer must come out inside a single calendar year. Partial distributions in the same year followed by a later payout in a different year disqualify the election.
- Move the employer stock in-kind to a taxable brokerage account. Do not sell it inside the plan and do not roll it into an IRA — either move destroys the NUA treatment.
- Roll the non-stock assets to an IRA. Cash, mutual funds, and other investments in the plan can be direct-rolled to a traditional IRA to preserve tax deferral.
- Report the cost basis as ordinary income. The plan’s basis in the shares appears on Form 1099-R and is taxable in the year of the distribution.
- Track the NUA amount separately. The unrealized appreciation is capital gain when you eventually sell the stock — automatically long-term, no holding-period test.
When does the net unrealized appreciation election actually save tax? ✅
The election tends to help when the cost basis is a small share of the current value, when your ordinary rates are high, and when the shares are likely to be held rather than sold immediately.
Concrete advantages of an NUA election under IRC §402(e)(4)(B):
- Ordinary income converts to long-term capital gain. The appreciation on the shares is taxed at preferential federal rates when you eventually sell, not at ordinary IRA-withdrawal rates.
- The NUA gain is not immediately taxed. Only the plan’s basis is taxed on distribution; the appreciation waits until sale.
- You control the sale timing. The NUA gain is triggered by your sale of the shares, which lets you spread the gain across multiple tax years or years with lower income.
- NUA gain is not subject to the 3.8% NIIT. Under IRC §1411, distributions from qualified plans are excluded from net investment income, and the NUA gain retains that qualified-plan character.
- Lower future required minimum distributions. The employer stock leaves the plan, so it no longer inflates the balance used to compute RMDs from the IRA.
- Partial election is allowed. You can apply NUA to some of the employer shares and roll the rest to an IRA — useful when only a portion of the block has a low basis.
- Estate planning benefit. If the shares pass at death, the NUA portion is treated as income in respect of a decedent under IRC §691, and the beneficiary is entitled to an IRD deduction for federal estate tax paid on that amount.
What are the risks and disadvantages of the NUA election? ⚠️
You owe ordinary tax on the basis immediately, you inherit a concentrated stock position, and inherited NUA shares do not get a full step-up in basis.
- Tax is due without a matching cash distribution. The basis portion is taxed even though only shares (not cash) leave the plan. Plan to pay the tax from other assets.
- Concentration risk. Long-tenured employees often end up with one company as a large share of net worth — a bad diversification profile that the tax election preserves.
- No basis step-up on the NUA portion at death. Ordinary inherited stock generally gets a step-up under IRC §1014, but the NUA amount is IRD and does not receive a step-up.
- State tax treatment varies. Not every state offers preferential rates on long-term capital gains; California, for example, taxes long-term capital gains at ordinary state rates.
- The election is fragile. A single mistake — a partial distribution across two tax years, rolling the stock into an IRA, or missing a triggering event — voids NUA entirely.
- You lose continued deferral on the distributed amount. Assets that stay inside the plan or IRA continue compounding tax-deferred; assets pulled out for NUA do not.
NUA election vs. IRA rollover: which is better? 📊
| Feature | NUA election (§402(e)(4)) | Full IRA rollover |
|---|---|---|
| Tax on the cost basis | Ordinary income in year of distribution | Deferred until IRA withdrawal |
| Tax on the appreciation | Long-term capital gains rate on sale | Ordinary income when withdrawn |
| 3.8% Net Investment Income Tax | Does not apply to NUA gain | Not applicable to withdrawals |
| Basis step-up at death | No step-up on the NUA portion (IRD) | IRA balance is IRD (no step-up either) |
| Required minimum distributions | Employer stock leaves the plan — smaller RMDs | Larger IRA balance — larger RMDs |
| Diversification | Locks in a concentrated position | Easy to sell inside IRA with no tax |
What should I do before making an NUA distribution? 🗂️
Get the plan’s cost-basis figure, model both scenarios against your marginal rates, and coordinate the distribution paperwork with the plan administrator in one tax year.
- Request a cost-basis statement from the plan administrator showing the plan’s basis in each lot of employer stock.
- Model the two paths — NUA election vs. full rollover — against your projected ordinary and capital gains brackets over the next 10 years.
- Time the distribution. A year with lower ordinary income (e.g., the year you retire) makes the ordinary-tax cost of the basis less painful.
- Check state treatment. If your state does not favor long-term capital gains, some of the federal advantage disappears.
- Set aside cash for the tax. The distribution triggers tax without producing cash — plan the withholding or estimated payment before you sign.
- Confirm sequencing in writing. All plan balances, one tax year, employer stock in-kind to a taxable account, other assets direct-rolled to an IRA.
📌 Key Takeaways
- Net unrealized appreciation is the built-in gain on employer stock held in a qualified plan under IRC §402(e)(4)(B).
- You pay ordinary tax only on the cost basis; the appreciation is taxed later at long-term capital gains rates.
- The entire plan balance must be distributed within one tax year, and the stock must move in-kind to a taxable account.
- The NUA gain is not subject to the 3.8% NIIT and does not inflate future RMDs.
- A partial distribution or an IRA rollover of the shares destroys the election permanently.
Frequently Asked Questions ❓
Q. Who is eligible to use the net unrealized appreciation election?
An employee (or their beneficiary) who receives a lump-sum distribution of employer securities from a qualified retirement plan after a triggering event under IRC §402(e)(4)(D) — separation from service, age 59½, death, or disability. The full plan balance must be distributed within a single tax year.
Q. Does NUA apply to my Roth 401(k) or an IRA?
No. NUA under IRC §402(e)(4)(B) applies to employer securities distributed from a qualified plan such as a traditional 401(k), profit-sharing plan, ESOP, or stock bonus plan. Roth accounts follow their own tax rules, and shares already in an IRA cannot receive NUA treatment.
Q. Is the appreciation on the stock automatically long-term?
Yes, for the NUA portion. IRC §402(e)(4)(B) and Publication 575 treat the unrealized appreciation as long-term capital gain when you sell the stock, regardless of how long you personally hold the shares after the distribution.
Q. How is the NUA reported on Form 1099-R?
The plan administrator reports the gross distribution in Box 1, the plan’s cost basis (the taxable ordinary amount) in Box 2a, and the net unrealized appreciation in Box 6. That Box 6 amount is not taxed until you sell the shares.
Q. What happens to any additional appreciation after the distribution?
Any gain above the NUA amount is taxed as capital gain when you sell the shares — long-term if you hold the shares for more than a year after distribution, short-term if not. Only the original NUA is automatically long-term.
Q. Does NUA still make sense if I plan to sell the stock right away?
Often yes, because the appreciation is taxed at long-term capital gains rates rather than ordinary rates — and the 3.8% NIIT under IRC §1411 does not apply. But if the basis is a large share of the current value, or your marginal ordinary rate is already low, the ordinary-tax cost of the basis can outweigh the benefit.
The NUA election is fact-specific and easy to disqualify with a single wrong form. If you are approaching a lump-sum distribution and hold employer stock, contact SW Accounting & Consulting Corp before you sign the distribution paperwork. Primary sources: IRC §402(e)(4), IRS Publication 575, IRC §1411 (Net Investment Income Tax), and IRC §691 (income in respect of a decedent).
