Introduction — What you'll learn and who this is for

This updated guide explains Net Unrealized Appreciation (NUA) for readers evaluating concentrated employer stock inside a 401(k). If you’re approaching retirement, already separated from service, or advising clients with large pre‑tax employer stock positions, you’ll learn when NUA typically beats rolling to an IRA, how to run the tax math with 2026 context, how to execute the distribution safely, and which timing levers (RMDs, pensions, Social Security) matter most.

Why this matters now: since 2022’s SECURE 2.0 changes and ongoing inflation indexing, retirement timing and RMD rules have shifted. That changes the income‑stacking calculus for a lump‑sum taxable event. This September 2026 update incorporates those rule shifts, current best practices for documentation and recordkeeping improvements common at major recordkeepers, and practical examples that reflect typical 2026 tax‑planning tradeoffs.

Prerequisites / Context

Before you consider NUA, confirm these basics:

  • You have employer securities (company stock) held inside a qualified plan (401(k), 403(b), profit‑sharing) that the plan can distribute in kind.
  • You are eligible for a qualifying lump‑sum distribution — typically only available after separation from service (confirm plan rules carefully).
  • You can obtain reliable cost basis records from the plan administrator for the company stock.
  • You understand how federal capital gains, the Net Investment Income Tax (NIIT), and your state taxes interact with ordinary income events.

Regulatory context relevant in 2026:

  • SECURE 2.0 (enacted in 2022) raised the RMD starting age for many participants; as of 2026, the first mandatory RMD age for many owners is 73. That affects whether you want to remove assets from a 401(k) early to reduce future RMDs.
  • SECURE 2.0 also reduced the excise tax on missed RMDs (from 50% to 25%, and potentially 10% if corrected promptly). That changes the penalty risk for distribution timing decisions, but it doesn’t change the NUA mechanics.
  • Federal long‑term capital gains tax structure still uses 0%, 15% and 20% tiers for most taxpayers; high earners may also face the 3.8% NIIT. State taxation of capital gains varies — states such as California tax gains as ordinary income.

What NUA is — the core mechanics (refresher)

NUA treats the appreciation in employer securities inside a qualified plan differently from the cost basis. When eligible employer stock is distributed in kind as part of a qualifying lump‑sum distribution after separation from service:

  • The cost basis portion is taxed as ordinary income in the year of distribution.
  • The appreciation (the NUA) is not taxed that year; when you later sell the shares, that appreciation is taxed at long‑term capital gains rates regardless of how long you hold the shares after distribution.
  • If you instead roll the employer stock into an IRA (traditional or Roth), you generally forfeit NUA treatment — the entire value becomes ordinary income when later withdrawn (or when converted to Roth).

When NUA typically makes sense — updated decision framework

NUA remains most attractive when the following conditions align:

  1. Large unrealized gain in employer stock relative to cost basis — the bigger the NUA slice, the bigger the tax arbitrage.
  2. Your ordinary income tax rate in the distribution year would be materially higher than the long‑term capital gains rate that will apply to the NUA on sale.
  3. You can time the distribution to a year with low ordinary income (for example: after leaving a job and before pension or Social Security benefits start, or a sabbatical/low‑income year).
  4. Your state tax situation preserves the capital gains advantage (some states reduce or eliminate the NUA edge by taxing gains as ordinary income).

NUA is less attractive when gains are modest, you need the simplicity of rolling into an IRA, or plan rules prevent a qualifying in‑kind, lump‑sum option.

Step‑by‑step evaluation and execution (2026 checklist)

Step 1 — Inventory and confirm plan rules

  1. Obtain the most recent plan statement and identify the employer securities sub‑ledger. Look specifically for lot‑level data (purchase dates and reported basis).
  2. Request a written plan statement (email or letter) from the plan administrator confirming whether the plan permits in‑kind distributions of employer stock and whether partial lump‑sum distributions are allowed. Post‑2022, more plans offer partial in‑kind options, but this is still plan‑specific.
  3. If basis records are missing or incomplete, ask for the historical contribution/purchase file. Major recordkeepers in 2026 generally have improved electronic cost‑basis reporting — but confirm and archive a copy.

Step 2 — Run the tax math with 2026 considerations

Compare at least three scenarios: (A) NUA (in‑kind lump‑sum distribution), (B) roll to a traditional IRA and sell later, (C) roll to IRA then convert to Roth (if Roth conversion is on the table). Include: federal ordinary tax, federal long‑term capital gains, 3.8% NIIT where applicable, state tax, and IRMAA/Medicare premium effects.

Updated example (illustrative for 2026):

  • Cost basis: $60,000
  • Market value at distribution: $300,000 → NUA = $240,000
  • Assume distribution year ordinary marginal rate: 32% federal, plus state tax 5%. Long‑term capital gains rate assumed at 15% federal plus state 5%. Include 3.8% NIIT if provisional income exceeds thresholds.

NUA (A): Ordinary tax on basis = $60,000 × 32% ≈ $19,200 (plus state tax on the same basis). Capital gains on sale of NUA = $240,000 × 15% = $36,000 (plus state tax). Total federal = $55,200 (paid across two events).

Roll to IRA then withdraw (B): $300,000 taxed as ordinary income when withdrawn: $300,000 × 32% = $96,000 federal (plus state tax). IRA route typically produces a far higher immediate ordinary‑income tax bill in this example.

Roth conversion (C): Converting $300,000 to Roth triggers ordinary income on the full value ($96,000 federal in the example). Roth removes future tax on gains and RMDs, but you lose the NUA capital‑gains treatment.

Key 2026 notes: include the 3.8% NIIT on high incomes, and account for IRMAA (Medicare Part B/D premium surcharges) which are still triggered by modified adjusted gross income from two years prior — a big conversion or distribution can raise Medicare premiums. Use 2026 IRMAA thresholds when modeling; if unsure, ask your CPA to model Medicare premium swings.

Step 3 — Timing: separation, pensions, RMDs and Social Security

  • NUA generally requires separation from service for a qualifying lump‑sum. Align your distribution with a low ordinary‑income year when possible.
  • RMD age changes under SECURE 2.0 matter: with many owners subject to RMDs starting at 73 (in 2026), removing large pre‑tax employer stock from the plan can lower future taxable RMDs — that may be desirable if you prefer to avoid RMD stacking.
  • Conversely, if you want to preserve tax‑deferred balances into later years when you expect lower tax rates, leaving the stock in plan and rolling non‑employer assets to Roth might be preferable.
  • Social Security taxation and IRMAA can be affected by a single large ordinary‑income event — model these knock‑on effects before acting.

Step 4 — Execute carefully

  1. Get written confirmation from the plan that an in‑kind, qualifying lump‑sum distribution is permitted and that the employer stock will be transferred in kind (not sold by the plan).
  2. Send the transfer to a receiving brokerage that will accept an in‑kind position and produce detailed 1099‑B sale statements when you dispose of shares.
  3. Ensure the plan issues a Form 1099‑R showing the taxable amount that equals the cost basis portion taxed as ordinary income in the distribution year. Archive the 1099‑R and the plan’s basis documentation.
  4. Coordinate tax‑withholding or estimated tax payments to avoid penalties and IRMAA surprises; large ordinary events often require quarterly estimated payments.
  5. Work with a CPA or tax attorney to confirm you’re completing the distribution in a way that preserves NUA (e.g., avoiding any rollover of the employer stock into an IRA).

Common mistakes and how to avoid them

  • Accidental rollover: Rolling the employer shares into an IRA destroys NUA. Avoid verbal instructions — get written confirmations and keep transfer records.
  • Incomplete basis documentation: If the plan’s basis reporting is inconsistent, request the historical lot files. Without reliable basis you risk misreporting and extra tax.
  • Ignoring state tax and NIIT: State rules can eliminate the NUA advantage; include state taxes and the 3.8% NIIT where applicable in your model.
  • Failing to model IRMAA and Social Security: A large ordinary income event can raise Medicare premiums and Social Security taxable income — these are real costs that change the net benefit.
  • Poor timing: Acting without aligning with pension starts or a low‑income year reduces the potential tax arbitrage.

Pro tips — things experienced planners do in 2026

  • Consider phased sales after distribution: sell the distributed shares over several years to manage capital gains realizations and avoid state rate cliffs.
  • If charitable giving is part of your plan, consider donating appreciated shares directly (after distribution) to reduce taxable gains and potentially get a charitable deduction.
  • Coordinate NUA with Roth conversion windows: sometimes splitting strategy—NUA on employer stock and Roth conversions on other assets across low‑income years—produces the best lifetime tax outcome.
  • Ask the receiving broker to produce lot‑level 1099‑B with correct acquisition date and cost basis information tied to the plan’s basis; this prevents IRS mismatch notices when you sell.
  • Run sensitivity analyses: have your advisor model a range of future tax‑rate scenarios and market returns — small changes can flip the preferred outcome.

Documentation and reporting reminders

When you pursue NUA you should receive:

  • Form 1099‑R for the distribution year showing the taxable ordinary income portion (usually the cost basis taxed in the distribution year).
  • Later, Form 1099‑B from the brokerage when you sell shares showing proceeds; your taxable gain will be sale proceeds minus the cost basis already taxed (the NUA portion is taxed at LTCG rates).
  • Keep the plan’s basis report and transfer confirmations; these will be essential if the IRS questions the split between ordinary income and capital gains at sale.

When to consult professionals

Consult a CPA or tax attorney when:

  • Your NUA amount exceeds mid‑six figures or the decision materially changes projected retirement tax brackets.
  • State tax rules are complex (residency changes, high‑tax states) or you face AMT/NIIT exposure.
  • You're coordinating NUA with pension elections, Social Security claiming strategies, or large Roth conversions.

Practical closing checklist

  1. Confirm plan permits an in‑kind, qualifying lump‑sum distribution for employer stock.
  2. Document cost basis and confirm lot‑level details with the plan administrator.
  3. Run a full tax comparison including federal ordinary, long‑term capital gains, NIIT, state taxes, IRMAA and Social Security effects.
  4. Time the distribution to a low ordinary‑income year where possible (and consistent with your retirement dates).
  5. Execute the in‑kind transfer to a brokerage, archive all paperwork, and coordinate estimated tax payments.
  6. Sell shares tax‑aware (staggered sales, charitable donations, or other strategies) and report correctly on Form 1099‑B.
  7. Validate the plan with a tax professional before you sign distribution paperwork.

NUA remains a powerful but procedural strategy: the single biggest risk is losing the treatment through an inadvertent rollover. In 2026, the interaction with SECURE 2.0 RMD timing, IRMAA rules and state taxation makes modeling more important than ever — small differences in timing or state residency can change the right answer. When the NUA math looks favorable, document every step, pick the right year, and confirm with a tax advisor.

FAQ

Can I do NUA on only part of my 401(k) account?

Sometimes. Whether you can take only the employer stock in kind and roll the remainder to an IRA depends on your plan. Since plan rules vary, get written confirmation from the plan administrator. Increasingly (post‑2022) many plans permit partial in‑kind distributions, but it is not universal.

Will a large NUA distribution raise my Medicare premiums?

Yes — a large ordinary income event can raise your modified adjusted gross income (MAGI) and trigger higher IRMAA surcharges on Medicare Part B and D premiums. Because IRMAA is based on income reported two years earlier, plan the timing and consult a tax advisor to model the impacts before you act.

What happens if my plan reports a different basis than I expect?

Discrepancies are common if records go back many years. Request the plan’s historical purchase/contribution files and get an official statement of basis from the plan administrator. If the plan’s basis differs from your records, resolve it before distribution to avoid later IRS issues.

Does state income tax usually negate the NUA benefit?

It depends on the state. Some states tax capital gains at ordinary rates (eroding the NUA edge), while others offer preferential capital gains treatment similar to federal rules. Always include state tax in your comparison; in high‑tax states the NUA benefit can be materially reduced.

Could future legislation remove the NUA advantage?

Tax law proposals frequently appear, and changes to capital gains or ordinary tax rates could alter NUA’s attractiveness. Because NUA’s benefit relies on the differential between ordinary and capital gains rates, monitor legislative developments and consult a tax professional when considering a large NUA transaction.