The Quick Answer

For most FIRE investors, the answer is: roll over to an IRA. The default is to move — but there are real, IRS- and plan-specific reasons to keep your 401(k) in some cases. Below is a complete decision framework based on the actual rules, not on what some blog told you to do.

You almost always have four options for an old 401(k): leave it in the former employer's plan, roll it to an IRA, roll it to a new employer's plan, or cash out (Fidelity Viewpoints — Considerations for an old 401(k), verified 2026-06-12; Schwab — Rollover IRA, verified 2026-06-12). This article is about choosing between the first two.

5 Reasons to Roll Over

1. Lower fees (often 10x lower)

401(k) plans from smaller employers frequently charge 0.30%–1.00% in total fees (mutual-fund ERs + admin fees). A retail IRA at Vanguard, Fidelity, or Schwab offers the same index funds at 0.04%–0.10%. Over 30 years, this fee difference on a $500K balance is roughly $300K-$500K in lost returns — the math is the same as the Best Rollover IRA for FIRE pillar. Vanguard reports an asset-weighted average MF/ETF expense ratio of 0.07% for its funds versus an industry average of 0.44% (as of 12/31/2025) (Vanguard — investment fees overview, verified 2026-06-12).

2. More investment options

Most 401(k) plans offer 10–30 mutual funds. A retail IRA offers thousands of low-cost index funds, ETFs, and individual stocks. For a buy-and-hold index investor this may not matter much; for a more active FIRE investor, the difference is huge.

3. Roth conversion flexibility

Most 401(k) plans do not allow in-service Roth conversions — you can only do them after you leave the employer. An IRA at any major broker supports partial Roth conversions on your schedule. This is critical for the Roth conversion ladder strategy, which is the only way most FIRE retirees can access retirement money before age 59½.

4. Better UX

The major brokerages (Fidelity, Schwab, Vanguard, IBKR) invest heavily in their mobile apps, research tools, and customer service. A typical 401(k) plan uses whatever recordkeeper the employer chose (Empower, Fidelity NetBenefits, Schwab, etc.) with a more limited interface.

5. Consolidation

Multiple old 401(k)s at former employers means multiple statements, multiple login portals, multiple places to track fees. Consolidating into a single IRA simplifies your financial life — and it's the IRS's preferred outcome for abandoned small-balance 401(k)s, too: accounts under $7,000 "may be sent to you as a taxable distribution, rolled over to an IRA, or, if your account is eligible for Auto Portability, may be automatically rolled to your new 401(k)" (Fidelity Viewpoints, verified 2026-06-12).

4 Reasons to Stay

1. Rule of 55

If you leave your job in or after the calendar year you turn 55, you can withdraw from that employer's 401(k) penalty-free (the 10% early-withdrawal additional tax under IRC §72(t) does not apply). This is a one-shot exception. It only applies to the 401(k) you held at the job you just left — not to old 401(k)s at previous employers, and not to IRAs.

The IRS's own table puts it in plain language: the "Separation from service" exception applies when "the employee separates from service during or after the year the employee reaches age 55" — and the yes/no column shows yes for qualified plans (401(k), etc.) and no for IRA/SEP/SIMPLE (IRS — Retirement topics: Exceptions to tax on early distributions, verified 2026-06-12; last reviewed 11-Dec-2025). Fidelity's article confirms the same point: "An early withdrawal penalty doesn't apply if you stopped working for your former employer in or after the year you reached age 55… This exception doesn't apply to assets rolled over to an IRA or to 401(k)s" (Fidelity Viewpoints, verified 2026-06-12).

If you might use Rule of 55 in the next few years, keep the relevant 401(k). Note: the lower age-50 threshold is for "qualified public safety employees" (federal/state law enforcement, firefighters, air traffic controllers, and certain others) under IRC §72(t)(10).

2. Stable value fund

Some 401(k) plans offer a stable value fund with a 2–3% guaranteed return, no mark-to-market risk, and contract-style insurance from the plan's wrap provider. IRAs don't really have an equivalent — money-market funds at retail brokerages yield less and aren't contract-guaranteed. If your plan has a stable value fund and you like the risk profile, keeping that one 401(k) for that one asset can make sense. (No specific URL to cite for stable value funds beyond the plan-specific offering — this is a plan-design feature, not a regulatory claim.)

3. Federal creditor protection (ERISA)

401(k) plans are protected by ERISA from your creditors indefinitely. IRAs have federal protection too under the Bankruptcy Abuse Prevention and Consumer Protection Act of 2005, but the rules are different — and state law fills in most of the gaps for non-bankruptcy creditor claims. The "broad protection" of 401(k)s is what Fidelity summarizes as "Federal law provides broad protection against creditors" and contrasts with IRAs, where "Federal law offers more protection for money in 401(k) plans than in IRAs. However, some states offer certain creditor protection for IRAs too" (Fidelity Viewpoints, verified 2026-06-12). The Department of Labor's Employee Benefits Security Administration (EBSA) enforces ERISA and publishes consumer information on these protections (DOL — Consumer Information on Pensions and Retirement, verified 2026-06-12). For most people this is a non-issue, but if you're in a profession with high lawsuit risk (doctors, small business owners, real-estate investors carrying liability), the difference can matter.

4. Plan-specific benefits

Some 401(k) plans have unique features: a brokerage window, a particularly good managed-account service, a Roth 401(k) option, institutional share classes with below-ER fees, or a stable value fund (see #2). If your plan has something your IRA can't replicate, keeping the money in the 401(k) is fine.

The Decision Tree

Your situation Recommendation
Current 401(k) fees ≤ 0.15%, good investment options, you'll use Rule of 55 within a few years Stay. Convenience + Rule of 55 + ERISA protection have real value.
Current 401(k) fees ≥ 0.30% and you don't need Rule of 55 Roll over. Long-term fee savings outweigh hassle.
You want to do Roth conversions within 5 years Roll over. 401(k) plans typically restrict in-service conversions.
You might use Rule of 55 at your current job Stay (for that 401(k)). Roll over any old 401(k)s from previous employers.
You have $5K+ in old 401(k)s at former employers Roll them over. Old 401(k)s are easy to forget and small plans often charge high fees.
Your 401(k) has a stable value fund, brokerage window, or other unique feature Stay (keep that 401(k)). Or split: roll over most, keep the 401(k) for that one asset.
You're in a high-lawsuit-risk profession and IRA protection matters in your state Stay. ERISA protection is broader for 401(k)s.
You have a balance under $7,000 in an old 401(k) and haven't touched it Roll it over now. Federal rules let the plan force-distribute small balances; take control.

The FIRE-Specific Considerations

For early retirees, two factors weigh more heavily than for traditional retirees:

  1. The Roth conversion ladder only works in an IRA. Most 401(k) plans do not support in-service partial Roth conversions. If you're planning to retire at 45 and use the ladder to access your pre-tax retirement money before 59½, you must roll over first.
  2. The 5-year bridge is easier from an IRA. During your bridge years (retirement to 59½), you'll be doing partial Roth conversions annually. A broker with strong partial-conversion UX (Fidelity, Schwab, Vanguard) makes this much smoother than most 401(k) plan interfaces — and most plans would not let you do in-service conversions anyway.

There's one FIRE exception to the "always roll over" rule: the Rule of 55 itself. If you plan to FIRE from a job in the year you turn 55 or later, you can access that specific 401(k) penalty-free at separation. The break-even is: keep enough in the 401(k) to cover your first ~5 years of expenses (the 59½ gap), then roll over the rest to an IRA for the conversion ladder. (Strategy detail is covered in the Roth Conversion Ladder Guide.)

A Common Mistake: "I Left That 401(k) at My Last Job 8 Years Ago"

If you have a 401(k) from a job you left years ago, you should almost always roll it over. Old 401(k)s are:

  • Easy to forget — old statements stop coming, then you stop thinking about the money.
  • Often have high fees — small plans with no negotiating leverage can charge 0.5%–1.0%+.
  • Hard to do Roth conversions from — same in-service restriction as current 401(k)s.
  • Hard to track in your net worth — separate portal, separate statement format, separate 1099-R at tax time.
  • Vulnerable to forced distribution — under federal rules, plans can force a distribution of balances under $7,000, often as a taxable check (Fidelity Viewpoints, verified 2026-06-12). If the plan sends you a check and you don't redeposit within 60 days, you owe taxes and possibly the 10% penalty.

Roll them over. Do it now. (See How to Roll Over a 401(k) to an IRA for the mechanics.)

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