Don't Automatically Roll Over Your Old 401(k): A DIY Guide to Fees, Backdoor Roths, and Asset Protection

When you leave a job, the most common advice is to roll your old 401(k) into an IRA “for more control.” That advice is incomplete, and for a lot of high earners it is the wrong default. A high-quality 401(k) with low-cost institutional funds, a reputable recordkeeper, and broad investment access is an institutional investing account, not a loose end you need to tidy up.

You have four options: leave the money in the old plan, roll it into a new employer’s plan, roll it into an IRA, or cash it out. The right answer comes from comparing the old plan, the new plan, and an IRA across six things: fees, investment quality, tax strategy, creditor protection, access rules, and how likely you are to manage the account well. Start there, not with “IRA by default.”

This is not a small decision in aggregate. The Investment Company Institute reports that about 61% of traditional-IRA-owning households held rollover assets as of mid-2025, rollovers make up roughly 80% of the average traditional IRA balance, and households moved about $670 billion from employer plans into traditional IRAs in 2022 alone. A rollover is also a moment when your money can move from a fiduciary workplace plan into a more commercial marketplace, so the incentives around the advice are worth knowing.

Try It: The Rollover Decision Tool

Answer eight questions about your situation and the tool returns one of four suggestions (leave it, roll to the new 401(k), roll to an IRA, or pause for advice), plus a fee-drag comparison so you can see what the cost difference is actually worth over time.

The Economic Case Against the Automatic IRA Rollover

The argument for rolling to an IRA is usually “more investment choices.” More choices only help if they come with equal or lower costs, and large 401(k) plans often win on price. Big plans buy institutional share classes and collective investment trusts (CITs) at plan-level pricing that retail investors cannot always access.

The fee data backs this up. ICI found that in 2024, 401(k) plan participants who invested in equity mutual funds paid an average expense ratio of 0.26%, versus 0.40% industrywide. ICI’s separate analysis of IRA fund investors finds that IRA mutual-fund investors pay higher average expense ratios than 401(k) investors across equity, bond, and hybrid funds. Economies of scale, employers defraying plan costs, and the absence of advisor-compensation features inside the plan all push 401(k) fund costs down.

This is why an anecdote like “the Vanguard trust funds in my employer’s plan are cheaper than the public Vanguard index funds” is common rather than surprising. Collective trusts are not registered mutual funds, they are negotiated at the plan level, and a large employer can land share classes a retail IRA investor cannot buy. If your old plan has that, the IRA “upgrade” may be a downgrade on price.

The counterpoint is real: a self-directed IRA in a total-market index ETF can cost 0.03% and beat a mediocre 401(k) menu loaded with actively managed funds and recordkeeping fees. 401(k)s do not always win; you have to look at the specific plans, because the menu and the all-in cost vary enormously.

Why Rollover Advice Can Be Conflicted

A rollover is a business opportunity for advisors, brokerages, and asset managers, so the advice you get is not always neutral. The GAO has flagged that retirement-advice conflicts arise from proprietary products, third-party payments, and compensation structures, and that the disclosures meant to manage them are not always clear or understood.

The academic evidence points the same way. A study summarized by the Harvard Law School Forum on Corporate Governance found that broker-advised participants in one retirement setting earned lower after-fee and risk-adjusted returns than comparable low-cost target-date benchmarks. For many investors, a simple low-cost default beats conflicted advice. Advisors are not necessarily acting in bad faith. The rollover is a product-distribution moment, and you should weigh advice accordingly.

The Three Main Options, Compared

Here is the tradeoff at a glance. Cashing out is the fourth option, and it is almost always the worst.

Cashing out triggers ordinary income tax and, if you are under 59½, usually a 10% penalty. Worse, a distribution paid to you directly carries a mandatory 20% federal withholding even if you plan to redeposit it, per IRS guidance on rollovers. When you do move money, use a direct (trustee-to-trustee) rollover to avoid that withholding entirely.

The Backdoor Roth Problem With IRA Rollovers

For high earners, this is often the strongest argument for keeping pre-tax money in a 401(k).

The backdoor Roth works by making a nondeductible contribution to a traditional IRA and converting it to a Roth IRA. The catch is the pro-rata rule. On IRS Form 8606, line 6 asks for the total year-end value of all your traditional, SEP, and SIMPLE IRAs. If you hold pre-tax money in any of those, only a fraction of your conversion counts as already-taxed basis, and the rest is taxable.

401(k) balances are not included in that Form 8606 total. So:

• Pre-tax money left in a 401(k) does not pollute the backdoor Roth calculation.
• That same money rolled into a traditional IRA does, and can make years of future backdoor Roth conversions mostly taxable.

If you are a high earner who plans to keep doing backdoor Roth contributions, that is a strong reason to keep pre-tax money inside a 401(k), either the old plan or the new employer’s plan. If you do not use the backdoor Roth, this concern does not apply to you. See the backdoor and mega-backdoor Roth guide for the full mechanics.

ERISA, Bankruptcy, and State-Law Asset Protection

Employer 401(k) plans covered by ERISA carry a strong federal anti-alienation protection: plan assets generally cannot be assigned or reached by creditors, with no dollar cap. The Department of Labor sets the fiduciary and protection framework. There are exceptions, including federal tax levies and QDROs in divorce, but for ordinary lawsuits and creditors the shield is broad.

IRAs are protected too, but the protection is more conditional. In federal bankruptcy, traditional and Roth IRA protection is capped and inflation-adjusted; the cap is $1,711,975 from April 1, 2025 through March 31, 2028. Money rolled in from an employer plan does not count against that cap, so the rollover dollars stay fully protected in bankruptcy. Outside bankruptcy, IRA creditor protection is governed by state law and varies widely, from full protection in some states to weak or capped protection in others.

Inherited IRAs are weaker still. In Clark v. Rameker (2014), the Supreme Court held that inherited IRAs are not “retirement funds” for the federal bankruptcy exemption, so an heir loses that protection. For doctors, executives, business owners, landlords, and anyone with elevated litigation exposure, the gap between ERISA protection and state-law IRA protection can matter. An IRA can still be the right choice; it is just not automatically the safer one. The companion guide on asset protection vs. withdrawal flexibility goes deeper, including a Washington-specific example.

Access, RMDs, and Special Features

A 401(k) has access features an IRA does not:

• Rule of 55. If you separate from service in or after the year you turn 55, you can take penalty-free distributions from that employer’s plan (age 50 for qualified public-safety workers), per IRS Topic 558. IRAs generally make you wait until 59½. Rolling to an IRA forfeits this bridge.
• Still-working RMD delay. If you are not a 5% owner, you can delay required minimum distributions from your current employer’s plan until you retire, per the IRS RMD FAQs. IRAs have no still-working exception.
• Employer stock and NUA. If you hold appreciated company stock, rolling it into an IRA forfeits net unrealized appreciation treatment, which can tax the appreciation at long-term capital-gains rates instead of ordinary income (see IRS Publication 575). NUA is a one-shot, lump-sum strategy; get advice before moving the shares.
• Stable value funds. Some 401(k)s offer stable value funds that pay more than money markets and are not available in IRAs.
• Loans. Old 401(k)s usually do not allow new loans, but a current employer’s plan might.
• Roth 401(k) money. Rolling Roth 401(k) dollars to a Roth IRA can be attractive, but understand the 5-year clock first since time in the 401(k) does not carry over.

My Recommendation

For a DIY investor, do not start with “roll to an IRA.” Work this hierarchy:

1. Keep the old 401(k) if it has low-cost broad index funds or CITs, no annoying admin fees, good custody and digital access, and you benefit from the backdoor Roth or ERISA protection.
2. Roll into the new employer’s 401(k) if it is as good or better and accepts roll-ins. You get consolidation without creating a pre-tax IRA balance.
3. Roll into an IRA if the 401(k) options are expensive, restrictive, or poorly run, and you value IRA flexibility more than the backdoor Roth and ERISA-style protections.
4. Avoid cashing out except for a true emergency.

Where this fits into the broader savings sequence is covered in the order of investing operations.

Who Each Option Fits

Leave it in the old 401(k)

Best for high earners doing backdoor Roth, anyone with an excellent old plan, large balances where small fee gaps compound, people who value ERISA protection, and plans with unusually cheap trust or CIT funds. Less ideal if you tend to forget old accounts, the plan has high recordkeeping fees, or you need flexible withdrawals.

Roll to the new 401(k)

Best for people who want consolidation, backdoor Roth users, and anyone whose new plan has good low-cost funds. Less ideal if the new plan is worse than the old one or you want full IRA flexibility.

Roll to an IRA

Best for people with bad 401(k) plans, those not using the backdoor Roth, retirees running detailed Roth-conversion ladders (see the Roth conversion ladder guide), and investors who want Treasuries, CDs, individual bonds, or a broader fund menu. Less ideal for backdoor Roth users, people who want maximum ERISA-style protection, and anyone prone to overtrading.

Frequently Asked Questions

Does leaving my 401(k) hurt my backdoor Roth?

No, the opposite. Pre-tax money in a 401(k) is excluded from the Form 8606 pro-rata calculation, so leaving it there keeps your traditional IRA balance at zero and your backdoor Roth conversions tax-free. Rolling that pre-tax money into a traditional IRA is what causes the problem.

Is a 401(k) really safer from creditors than an IRA?

For ordinary lawsuits and creditors, an ERISA-covered 401(k) has broad federal protection with no dollar cap. IRA protection in bankruptcy is capped (about $1.7M, adjusted for inflation, with rollover dollars uncapped), and outside bankruptcy it depends on your state. The difference matters most for people with above-average litigation exposure.

What is the Rule of 55?

If you leave your employer in or after the year you turn 55, you can take penalty-free withdrawals from that employer’s 401(k). IRAs do not offer this, so rolling to an IRA before 59½ can cost you a useful early-access bridge.

When should I actually roll to an IRA?

When your old and new plans are expensive or restrictive, you do not use the backdoor Roth, and you want broad investment access or are planning Roth conversions in retirement. An IRA at a low-cost custodian can be cheaper than a poor 401(k) menu.

What about my company stock?

Appreciated employer stock can qualify for net unrealized appreciation treatment, which a rollover to an IRA destroys. If you hold a meaningful position, separate the stock from the rest of the balance and get tax advice before moving it.

Related Guides

• Roth 401(k) as Vault, Roth IRA as Valve goes deep on ERISA anti-alienation, the bankruptcy cap, and state-by-state protection, including a Washington example.
• The Tax-Advantaged Trifecta covers the backdoor Roth, mega-backdoor Roth, and HSA mechanics that interact with this rollover decision.
• The Mega Backdoor Roth explains the after-tax 401(k) contributions and in-plan conversions that build large Roth balances.
• The Roth Conversion Ladder shows when moving pre-tax money to an IRA for conversions is the right call.
• The Order of Investing Operations places this decision in the broader savings waterfall.

Key Takeaways

• A good old 401(k) is not stranded money. Compare the old plan, new plan, and IRA on fees, investments, taxes, protection, access, and simplicity instead of defaulting to an IRA.
• 401(k)s often win on price. Institutional share classes and CITs can beat retail IRA funds; ICI puts 401(k) equity fund costs at 0.26% in 2024, below the IRA average.
• The backdoor Roth interaction is decisive for high earners. Pre-tax money in a 401(k) is excluded from the Form 8606 pro-rata calculation; the same money in a traditional IRA is not.
• ERISA protection is broad and uncapped. IRA protection is capped in bankruptcy and state-dependent outside it, which matters most for high-litigation-risk professionals.
• Watch the special features. Rule of 55, the still-working RMD delay, NUA on company stock, and stable value funds can all be lost in an IRA rollover, and a direct rollover avoids the 20% withholding trap.