Quick Answer
NUA allows employees to withdraw employer stock from their 401(k) at retirement, paying ordinary income tax only on the original cost basis (typically 10-30% of current value) while the appreciation is taxed later as long-term capital gains. For stock worth $500,000 with a $100,000 basis, this can save $60,000-80,000 in taxes compared to traditional rollover treatment.
Best Answer
Robert Kim, Tax Return Analyst
Employees with significant employer stock holdings in their 401(k) facing retirement distribution decisions
How NUA works: The tax arbitrage opportunity
Net Unrealized Appreciation (NUA) is one of the most powerful but underutilized tax strategies available to employees with employer stock in their 401(k). The strategy exploits the difference between ordinary income tax rates (up to 37%) and long-term capital gains rates (0%, 15%, or 20%).
The basic NUA transaction
When you separate from service (retire, quit, or are terminated), you can take an in-kind distribution of your employer stock instead of rolling it to an IRA. Here's what happens:
1. Immediate tax: Pay ordinary income tax on the stock's original cost basis (what the 401(k) paid for the shares)
2. Future tax: When you eventually sell, appreciation is taxed as long-term capital gains
3. Key requirement: Must be part of a "lump sum distribution" — your entire 401(k) balance distributed within one tax year
Example: $800,000 in employer stock
John, age 65, has $800,000 in company stock in his 401(k):
NUA strategy:
Traditional IRA rollover:
NUA vs. other distribution strategies comparison
Critical NUA requirements and deadlines
Triggering events: Must occur after one of these:
Lump sum distribution rule: Your ENTIRE 401(k) balance must be distributed within one tax year following the triggering event. You cannot take partial distributions and still qualify for NUA.
Other plan balances: All employer plans must be distributed, including other 401(k)s, 403(b)s, and profit-sharing plans from the same employer.
Advanced NUA strategies
Partial stock sale: After the NUA distribution, you can sell some shares immediately (paying capital gains on appreciation) while holding others for continued growth.
Estate planning benefits: NUA stock receives stepped-up basis at death, eliminating capital gains tax for heirs on appreciation that occurred after the distribution.
Net investment income tax: High earners (modified AGI over $200,000/$250,000) pay an additional 3.8% on capital gains. Factor this into NUA calculations.
When NUA doesn't make sense
What you should do
NUA analysis requires precise calculations based on your specific situation. Gather your 401(k) statements showing cost basis information (Form 1099-R will show this after distribution). Consider consulting with a tax professional before making the election, as it cannot be reversed. Use our refund-estimator to model the tax impact of different distribution strategies.
Key takeaway: NUA can save high earners with appreciated employer stock $30,000-100,000+ in taxes, but requires careful analysis of cost basis, future tax brackets, and estate planning goals.
Key Takeaway: For employer stock with significant appreciation, NUA can reduce total tax burden by 20-40% compared to traditional IRA rollover, but only works with lump sum distributions.
Tax treatment comparison for $500,000 employer stock with $150,000 cost basis
| Strategy | Immediate Tax | Tax Rate on Growth | Total Tax (24% bracket) | After-Tax Value |
|---|---|---|---|---|
| NUA election | $36,000 (ordinary on basis) | 15% long-term cap gains | $88,500 | $411,500 |
| Traditional IRA rollover | $0 | 24% ordinary income | $120,000 | $380,000 |
| Roth conversion | $120,000 (ordinary on full amount) | 0% (tax-free) | $120,000 | $380,000 |
| Cash distribution | $120,000 + 10% penalty | N/A | $170,000 | $330,000 |
More Perspectives
Michelle Woodard, Tax Policy Analyst
Those approaching retirement with employer stock in their 401(k) needing distribution planning
Retirement timing considerations for NUA
The decision to use NUA must be made at the time of your qualifying distribution — typically retirement. Once you roll employer stock to an IRA, you lose the NUA election forever.
Analyzing your cost basis
Most employees don't know their cost basis in employer stock. Request this information from your 401(k) administrator before retiring. Generally:
Managing the immediate tax hit
The ordinary income tax on your cost basis is due in the year of distribution. Plan accordingly:
Post-distribution planning
After the NUA distribution, you own the stock in a taxable account. Consider:
Key takeaway: NUA requires careful retirement timing and post-distribution management, but can provide significant tax benefits for retirees with highly appreciated employer stock.
Key Takeaway: Retirees should analyze cost basis and coordinate NUA timing with overall retirement tax planning to maximize benefits.
Robert Kim, Tax Return Analyst
Those focused on maximizing after-tax investment returns through strategic tax planning
NUA as part of comprehensive tax-efficient investing
NUA represents a unique opportunity to convert future ordinary income into capital gains. For investors focused on tax efficiency, this arbitrage can significantly enhance after-tax returns.
Comparing after-tax returns
Consider a $1 million employer stock position with $300,000 cost basis:
NUA strategy:
IRA rollover then withdrawal:
Integration with overall asset allocation
NUA creates a large taxable position in a single stock. Consider:
Estate planning optimization
NUA stock receives stepped-up basis at death, making it an excellent asset to hold for estate planning. The appreciation after distribution escapes capital gains tax entirely for heirs.
Key takeaway: From a pure investment efficiency standpoint, NUA can add 6-8% to after-tax returns for highly appreciated employer stock, making it one of the most powerful tax strategies available.
Key Takeaway: NUA can increase after-tax investment returns by 6-8% compared to traditional rollover approaches, especially valuable for tax-focused investors.
Sources
- IRS Publication 575 — Pension and Annuity Income
- Internal Revenue Code Section 402(e)(4) — Net unrealized appreciation tax treatment
Reviewed by Robert Kim, Tax Return Analyst on February 28, 2026
This content is for educational purposes only and is not a substitute for professional tax advice. Consult a qualified tax professional for advice specific to your situation.