Complete 401(k) Rollover Guide

An honest framework for the decisions at hand. Not tax or investment advice — your specifics matter.

Your four options

• Leave it in the old 401(k). Zero action. Subject to old plan's fund menu and fees. Full ERISA creditor protection under 29 U.S.C. § 1056(d).¹ Loses simplicity if you have multiple past plans.
• Roll to new employer's 401(k). Consolidates accounts. Lets you use the new plan's loan provision. Fund menu might be worse than your old plan.
• Roll to a traditional IRA (direct trustee-to-trustee). Maximum investment flexibility, lowest fees at Fidelity/Schwab/Vanguard. Gives up: ERISA creditor protection (state-dependent IRA bankruptcy protection up to $1.7M federal cap as of 2025),² age-55 rule access, and backdoor Roth cleanliness (pro-rata rule).
• Convert to Roth IRA. Pay tax now at current rates, future growth + withdrawals tax-free if qualifying. Makes sense if current marginal rate is lower than expected retirement rate, or if you have a long compounding runway.

The age-55 rule — do not skip this

• Under IRC § 72(t)(2)(A)(v), if you separate from service (quit, retire, get laid off) in or after the year you turn 55, you can take 401(k) distributions penalty-free before 59½.³ (Age 50 for qualified public safety officers per § 72(t)(10).)
• Rolling to an IRA permanently forfeits this exception. IRAs require 59½ for penalty-free withdrawal (with limited SEPP / § 72(t)(2) exceptions).
• If you expect to need retirement income between 55 and 59½, either don't roll out, or roll only the portion you don't need for bridge income.

NUA for highly-appreciated employer stock

• If you hold employer stock in your 401(k) with a large gain, Net Unrealized Appreciation (NUA) treatment under IRC § 402(e)(4) can produce a massive tax win.⁴
• Roll the non-stock portion to an IRA; take employer stock in-kind to a taxable account. Pay ordinary income tax on the cost basis only. The NUA converts to long-term capital gains when you eventually sell — automatic LTCG treatment, no 1-year holding period required.
• One-shot, irreversible election. Requires a lump-sum distribution: the entire plan balance distributed in one taxable year. Any prior partial distribution can disqualify.

Backdoor Roth complications

• Pro-rata rule under IRC § 408(d)(2): if you have any pre-tax balance in any traditional IRA (including SEP/SIMPLE) on December 31, non-deductible IRA contributions become partially taxable on Roth conversion.⁵
• Rolling pre-tax 401(k) money to a traditional IRA taints the backdoor Roth strategy by introducing pre-tax basis into your IRA pool.
• Solutions: keep pre-tax money in a 401(k) (old or new); or do a reverse rollover from IRA into the new 401(k) (plan must accept incoming rollovers) before doing the backdoor Roth, leaving only after-tax basis in the IRA.
• Track basis on Form 8606 annually. Lost basis records mean double taxation at withdrawal.

Fee-only advisor red flags

• Any advisor pushing rollover without discussing age-55 rule, NUA, or backdoor Roth implications is not doing the analysis.
• Commissioned advisors earn AUM only if you roll out. Fee-only advisors are indifferent — ask them to model your specific situation.

Sources

1. 29 U.S.C. § 1056(d) — ERISA Anti-Alienation Creditor Protection.
2. 11 U.S.C. § 522(n) — Federal Bankruptcy IRA Protection ($1.7M+ inflation-adjusted cap). State protection for non-bankruptcy creditors varies.
3. IRC § 72(t)(2)(A)(v) — Rule of 55 (Separation from Service at Age 55+).
4. IRC § 402(e)(4) — Net Unrealized Appreciation Treatment. Lump-sum distribution required per § 402(e)(4)(D).
5. IRC § 408(d)(2) — IRA Pro-Rata Rule. Track basis via IRS Form 8606.
6. IRS — Rollovers of Retirement Plan and IRA Distributions. Direct trustee-to-trustee rollover avoids 20% mandatory withholding.

Rollover decisions are permanent once executed. Verify age-55 rule applicability, NUA eligibility, and pro-rata implications before rolling out. All tax rules verified as of April 2026.