Abstract: Rolling an old 401(k) into an IRA can reduce fees, consolidate scattered accounts, and provide broader investment choices. But a rollover can also eliminate penalty-free access under the rule of 55, complicate future backdoor Roth contributions, and surrender some of the stronger creditor protections associated with employer plans. The appropriate decision depends on the worker’s age, fees, tax strategy, legal exposure, and the provisions of the 401(k) plan. A rollover should therefore be treated as a consequential financial decision, not an automatic step after leaving a job.
Workers leaving an employer are often encouraged to roll their former 401(k) balance into an individual retirement account. An IRA can consolidate scattered accounts, reduce administrative and investment expenses, provide a wider range of investment choices, and prevent small former-employer accounts from being gradually depleted or forgotten. Retaining assets in a 401(k), however, can preserve penalty-free access under the rule of 55, protect the ability to make relatively tax-efficient backdoor Roth conversions, and provide stronger and more uniform protection against creditors.
The appropriate decision therefore depends on the worker’s age, account balance, investment costs, anticipated Roth strategy, need for early withdrawals, exposure to creditors, and the specific provisions of the former employer’s plan. A small, high-cost 401(k) left behind at an old employer can evaporate surprisingly quickly. Conversely, automatically moving every 401(k) into an IRA can cause the worker to surrender valuable tax and legal protections.
This comparison begins only after a worker has accumulated money in an employer plan. During the accumulation stage, however, 401(k)s generally receive advantages that ordinary IRAs do not: substantially higher contribution limits, possible employer matching contributions, and workplace systems that can automatically enroll employees and deduct contributions from each paycheck. Individuals without access to an employer-sponsored plan must rely primarily on IRAs, which ordinarily provide less contribution capacity and no employer match. An IRA may therefore be a useful destination for an existing 401(k), but it is not a fully equivalent substitute for the workplace plan that helped produce the balance.
The IRA Advantage in Reducing Fees and Preventing Stranded Accounts
The most immediate argument for transferring assets from a former employer’s 401(k) to an IRA is the opportunity to consolidate retirement savings in a carefully selected, low-cost account. Workers who change jobs repeatedly can accumulate several small 401(k) accounts, each with different investment menus, passwords, administrators, plan rules, and fees. Consolidating those balances can make it easier to monitor investments, maintain current contact and beneficiary information, and implement a coherent retirement strategy.
Small former-employer accounts are particularly vulnerable to fee erosion. A plan may impose both investment expenses calculated as a percentage of assets and fixed administrative charges that fall especially heavily on small balances. For example, a $1,000 account subject to a $100 annual administrative charge loses 10 percent of its value in the first year before considering investment performance. Even less dramatic charges can consume a substantial portion of a modest account when they continue for many years.
The cumulative effect can also be substantial for larger accounts. Research presented in How to Minimize the Impact of 401(k) Fees demonstrates that apparently small differences in annual expenses can produce very large differences in lifetime retirement wealth. A median-wage worker trapped in a high-cost plan could pay more than $100,000 in lifetime fees above the amount paid in a well-managed, low-cost plan.
The danger is not limited to fees. Former employees may move, overlook notices, lose passwords, fail to update their addresses, or simply forget that an account exists. Current law permits plans, when their governing documents allow, to remove certain former employees with small, vested balances and transfer qualifying funds to default IRAs when the participants fail to act. The receiving account is not necessarily inexpensive, and the worker may end up with another fragmented account that is difficult to locate or manage.
Inactive or abandoned retirement-related assets may also eventually become subject to state unclaimed-property procedures. When invested assets are liquidated after entering state custody, an owner who later recovers the money may receive only the value at the time of liquidation and lose the investment appreciation that would otherwise have occurred. Some owners never reclaim the assets at all. These problems are examined in greater detail in Stranded Savings: Inactive Accounts, Missing Rollovers, and the Hidden Cost of Fees.
A rollover into a deliberately chosen, low-cost IRA can address several of these problems at once. It can reduce account fragmentation, make savings easier to monitor, lower the risk that the owner will lose contact with an administrator, and replace an expensive or restrictive former-employer plan with a broader investment platform. IRAs also frequently offer greater flexibility in selecting mutual funds, exchange-traded funds, individual securities, fixed-income investments, and withdrawal arrangements.
This advantage is not universal. Some large employer plans offer institutional investments at costs below those available to individual investors. Some also provide access to stable-value funds or other investments that may not be readily available in an IRA. Conversely, an IRA managed by a high-cost adviser may impose advisory and investment expenses that exceed the cost of the former employer’s plan. The relevant comparison is therefore not between 401(k)s and IRAs in the abstract. It is between the total costs and features of the worker’s actual plan and those of a specific IRA.
The case for consolidation must also be weighed against important protections that can be lost when assets leave an employer plan.
The 401(k) Advantage Under the Rule of 55
Age 59½ is generally the point at which distributions from retirement accounts cease to be subject to the 10 percent additional tax on early distributions, although ordinary income tax and applicable plan restrictions may still apply. One important exception—the separation-from-service exception commonly called the “rule of 55”—applies to qualified employer plans but not to IRAs.
A worker who separates from an employer during or after the calendar year in which the worker turns 55 may generally take distributions from that employer’s 401(k), 403(b), or similar qualified plan without incurring the normal 10 percent additional tax. The withdrawals are penalty-free, not income-tax-free: distributions of pretax contributions and investment earnings remain subject to ordinary income tax.
Crucially, the exception does not apply to traditional IRAs. A worker who rolls the former employer’s 401(k) balance into an IRA may therefore lose access to the rule of 55 and ordinarily must wait until age 59½ to avoid the additional tax, unless another statutory exception applies.
The rule generally applies only to the plan maintained by the employer from which the worker separated during or after the qualifying year. It does not automatically apply to 401(k) accounts left at still earlier employers. A worker anticipating retirement between ages 55 and 59½ may therefore want to consider consolidating earlier employer accounts into the current employer’s plan before separating, provided that the plan accepts incoming rollovers.
The employer plan must also permit the desired form of distribution. Some plans allow former employees to make periodic or partial withdrawals, while others restrict access to a lump-sum distribution or a limited number of withdrawals. A worker contemplating use of the rule should review the plan documents before retiring or completing a rollover.
These rules create a potentially significant advantage for retaining retirement savings in a former employer’s 401(k) rather than immediately moving the balance into an IRA. A recent Wall Street Journal article by Anne Tergesen reports that workers often lose access to the rule simply because they roll their accounts into IRAs without realizing the consequence.
The 401(k) Advantage for Backdoor Roth Conversions
The tax cost of making a backdoor Roth contribution can be much lower for a taxpayer whose existing pretax retirement savings are held in a 401(k) rather than a traditional IRA.
A person with $400,000 in a 401(k) and no money in a traditional, SEP, or SIMPLE IRA can generally make a nondeductible traditional IRA contribution and promptly convert it to a Roth IRA with little or no additional taxable income, assuming the contribution has not generated investment gains. The $400,000 held in the 401(k) is excluded from the IRS pro-rata calculation.
By contrast, suppose the same person has no 401(k) balance but holds $400,000 of pretax money in traditional IRAs. The IRS aggregates the taxpayer’s traditional, SEP, and SIMPLE IRA balances with the new nondeductible contribution. The taxpayer cannot designate only the after-tax contribution as the amount being converted.
As a result, nearly the entire conversion is included in taxable income and taxed at the taxpayer’s applicable federal and state marginal rates.
This creates a significant tax preference for holding existing pretax retirement savings in a 401(k) rather than an IRA. A rollover that initially appears attractive because of lower fees or broader investment choices can make years of future backdoor Roth contributions substantially more expensive.
This disadvantage can sometimes be reversed. A taxpayer whose current employer’s plan accepts incoming rollovers may be able to move pretax IRA assets into that 401(k), removing those assets from the IRA pro-rata calculation. Whether this strategy is available depends on the terms of the employer plan.
The 401(k) Advantage in Creditor Protection
The clearest creditor-protection advantage of a 401(k) over an IRA arises outside bankruptcy. Assets held in most private-sector employer-sponsored 401(k) plans receive broad and relatively uniform federal protection under the Employee Retirement Income Security Act. ERISA’s anti-alienation provisions generally prevent ordinary judgment creditors from reaching the account, even when a creditor has successfully sued the plan participant.
Traditional and Roth IRAs do not receive comparable nationwide federal protection from creditors outside bankruptcy. Their protection depends primarily on state law and therefore varies substantially from state to state. An IRA that is fully protected from a judgment creditor in one state may receive only limited protection in another.
Limited exceptions apply to 401(k) protection. Assets may be reached pursuant to a qualified domestic-relations order, certain federal tax claims, and some federal criminal judgments. Governmental and church plans may also be governed by different legal rules because they are generally outside ERISA.
The difference between 401(k)s and IRAs is smaller in bankruptcy. Congress substantially strengthened federal IRA protection through the Bankruptcy Abuse Prevention and Consumer Protection Act of 2005. Under current federal law, both 401(k) plans and IRAs receive substantial bankruptcy protection.
The protection is not identical, however. Assets remaining in an ERISA-qualified 401(k), and qualifying amounts later rolled from such a plan into an IRA, are generally protected in bankruptcy without a dollar ceiling, although the owner may need records tracing the rollover assets to the former employer plan. By contrast, amounts contributed directly to traditional and Roth IRAs, together with the earnings attributable to those contributions, are protected only up to the inflation-adjusted federal ceiling.
The distinction becomes especially important when retirement assets are inherited. In 2014, the Supreme Court ruled in Clark v. Rameker that an inherited IRA held by a non-spouse beneficiary does not qualify as the beneficiary’s protected “retirement funds” under the federal bankruptcy exemption. State law may nevertheless provide some protection.
An inherited 401(k) that remains inside an ERISA-covered employer plan may receive stronger protection, and this potential advantage is not limited to surviving spouses. In the 2021 In re Dockins decision, a federal bankruptcy court held that a 401(k) inherited by a non-spouse beneficiary was excluded from the beneficiary’s bankruptcy estate because the assets remained with the ERISA plan administrator and continued to be subject to the plan’s anti-alienation restrictions.
The crucial distinction is therefore not simply whether the beneficiary is a spouse, but whether the inherited assets remain inside the ERISA-qualified employer plan. Once the assets are distributed or transferred to an inherited IRA, ERISA protection no longer applies. A non-spouse beneficiary cannot roll the inheritance into the beneficiary’s own IRA and ordinarily must use an inherited IRA if the money leaves the employer plan.
A surviving spouse has an option unavailable to a non-spouse beneficiary. The spouse may generally roll an inherited 401(k) into an IRA in the spouse’s own name, so the account is treated as the spouse’s own retirement savings rather than as an inherited IRA. A non-spouse beneficiary cannot take this step and, if the assets leave the employer plan, must generally transfer them to an inherited IRA.
The treatment of inherited 401(k)s should nevertheless be described cautiously. In re Dockins is a lower federal bankruptcy-court decision, not a nationwide Supreme Court ruling. Even so, the case indicates that an inherited 401(k) left inside an ERISA plan may be better protected than the same assets transferred to an inherited IRA, including when the beneficiary is not the participant’s spouse.
These differences create another reason for account owners and beneficiaries to consider creditor protection before moving retirement assets out of an employer-sponsored plan.
The Decision May Change Over Time
The choice between retaining an old 401(k) and rolling it into an IRA need not have the same answer throughout a worker’s life. A worker approaching retirement at age 55 may place substantial value on preserving penalty-free access. A high-income worker making annual backdoor Roth contributions may benefit from keeping pretax balances outside the IRA system. A business owner, physician, lawyer, landlord, or other person facing meaningful litigation exposure may place greater value on ERISA creditor protection.
After the worker reaches age 59½, stops making backdoor Roth contributions, or experiences a change in legal or financial circumstances, the advantages of consolidation and lower IRA costs may become more important. Conversely, a very small 401(k) subject to high fixed fees may warrant prompt attention regardless of the worker’s longer-term strategy.
The correct approach is not to assume that an IRA rollover is always prudent or that a 401(k) should always be retained. Workers should compare the actual fees, investment options, distribution provisions, creditor protections, and tax consequences of the two accounts before acting. Automatic advice to roll every former-employer account into an IRA can be as damaging as leaving every account behind indefinitely.
Authors Note: Many aspects of the tax code put workers who must rely on IRAs because they do not have access to a 401(k) plan at a substantial disadvantage. Potential policies designed to address this problem can be found at https://www.economicmemos.com/p/tax-reconciliation-and-retirement
Some Notes:
Fees: An analysis on this blog finds that retirement-plan fees vary widely and that small annual differences can create lifetime costs exceeding $100,000 for some workers.
Stranded Accounts: An analysis at this blog discusses fee erosion, fragmented accounts, state unclaimed-property procedures, liquidation risk, and the limitations of default rollover arrangements.
Rule of 55: The IRS confirms that the separation-from-service exception applies when separation occurs during or after the calendar year in which the participant reaches 55. The recent Wall Street Journal article emphasizes that rolling the money into an IRA can inadvertently eliminate access to the exception.
Backdoor Roth pro-rata rule: Form 8606 aggregates traditional, SEP, and SIMPLE IRA balances when determining the taxable portion of a conversion; employer-plan balances are not included. Kiplinger also identifies the pro-rata complication as a reason not to roll every 401(k) into an IRA.
https://www.irs.gov/instructions/i8606
IRA bankruptcy protection: The 2005 bankruptcy law created stronger federal protection for IRAs. The current inflation-adjusted ceiling of $1,711,975 became effective April 1, 2025.
https://www.ascensus.com/industry-regulatory-news/news-articles/ira-bankruptcy-exemption-increases/
Inherited IRAs” In Clark v. Rameker, the Supreme Court held that a non-spouse inherited IRA was not protected as the beneficiary’s “retirement funds” under the federal bankruptcy exemption.
https://supreme.justia.com/cases/federal/us/573/122/
Inherited 401(k)s: In In re Dockins, the bankruptcy court concluded that an inherited 401(k) remaining in an ERISA plan was excluded from the bankruptcy estate.
https://www.ncwb.uscourts.gov/sites/ncwb/files/opinions/ncwb_live.1.20.bk_.10119.14549384.0.pdf