Leave Your 401(k) With the Old Employer or Roll It to an IRA?

Most people assume rolling over is the obvious move. For many it is — but not for everyone. Five specific situations make staying in the plan genuinely better, sometimes by a lot. This guide lays out the full decision framework with real numbers, then gives you an interactive checklist to map your own situation.

When staying in the 401(k) is the right call

1. The Rule of 55 — penalty-free access before 59½

Under IRC § 72(t)(2)(A)(v), if you separate from service during or after the calendar year in which you turn 55, you can take distributions from that employer's 401(k) without the normal 10% early-withdrawal penalty. This applies at any time after separation — you don't have to wait until 55 to make the withdrawal, only until you turn 55 in the year you left.

Why this matters: If you retire or leave your job at 57, you could need income for 2½ years before you can touch an IRA penalty-free. A 401(k) with the Rule of 55 intact gives you that bridge. Once you roll to an IRA, you lose it — IRA distributions before 59½ trigger the 10% penalty (absent other exceptions like SEPP/72(t) or disability).

Example: Sarah leaves her corporate job at 56 with $900,000 in her 401(k). She needs $60,000/year to live until her pension starts at 62. She can pull $60K/year penalty-free from the 401(k) under the Rule of 55. If she had rolled to an IRA before realizing this, she'd owe $6,000/year in extra penalties — $18,000 over three years.

2. ERISA creditor protection — unlimited federal shield

ERISA-covered 401(k) plans (and most 403(b)s and profit-sharing plans) receive nearly unlimited federal creditor protection under 29 U.S.C. § 1056(d). The anti-alienation rule means the plan assets cannot be assigned to creditors, attached, or garnished — in or outside of bankruptcy — with very limited exceptions (IRS tax levies, qualified domestic relations orders).¹

IRAs are different. They receive unlimited protection only within bankruptcy (11 U.S.C. § 522), and even then only up to a cap. As of April 2025, the federal IRA bankruptcy exemption is $1,711,975 per person — indexed every three years. Outside of bankruptcy, IRA protection depends entirely on your state. Some states (California, Florida) have strong IRA protections; others do not.²

For most people this distinction is theoretical. But if you're a physician, business owner, or anyone facing elevated litigation risk, the gap between "unlimited federal protection" and "$1.7M with state-specific variability" is material. If your rollover IRA would be large (say, $2M+) and you operate in a high-liability profession, talk to a fee-only advisor before rolling.

3. Net Unrealized Appreciation (NUA) — convert ordinary income to capital gains

If your 401(k) contains highly appreciated employer stock, the NUA strategy lets you take that stock as an in-kind distribution, pay ordinary income tax only on the cost basis of the shares, and then sell them later at long-term capital gains rates on the rest of the appreciation — even if you hold them for one day.³

This strategy requires a lump-sum distribution from the plan — you must take the entire plan balance in a single tax year (with the stock going in-kind and the rest rolling to an IRA). Once you roll the employer stock into an IRA, the NUA opportunity disappears permanently. The appreciation becomes ordinary income when you eventually take IRA distributions.

If your 401(k) contains highly appreciated employer stock, evaluate the NUA split-rollover before making any rollover decision. See our full NUA guide and calculator to model the numbers for your specific cost basis.

4. Backdoor Roth — keeping your IRA clean

If you make backdoor Roth IRA contributions (a non-deductible traditional IRA contribution followed by a Roth conversion), pre-tax IRA balances create a problem. Under the pro-rata rule (IRC § 408(d)(2)), the IRS treats all your traditional IRA money as a single pool when you convert. If you have $0 in pre-tax IRAs, a $7,000 non-deductible contribution converts entirely tax-free. If you have $400,000 in pre-tax IRA rollover funds plus $7,000 non-deductible, only 1.7% of any conversion is tax-free — the backdoor effectively doesn't work.⁴

Keeping your former employer's 401(k) in the plan — rather than rolling it to a traditional IRA — keeps your IRA balance at zero and preserves backdoor Roth access. Some people do the reverse: they roll existing pre-tax IRA balances into their current employer's 401(k) to clear the pro-rata issue, then do backdoor Roth contributions going forward.

See our pro-rata rule guide for the full mechanics and three strategies to fix the problem.

5. Stable value funds

Many large 401(k) plans offer a stable value fund — an insurance-wrapped investment that credits a book-value interest rate (typically 3–5% in recent years) without the NAV volatility of bond funds. These funds have no equivalent in the IRA universe. Money market funds at a discount broker yield roughly the same as T-bills, but stable value funds can yield meaningfully more with better principal stability than short-duration bond funds.

If your 401(k) stable value fund is crediting 4.5% and you're near or in retirement using it as a cash-flow source, that's a real benefit to weigh against the flexibility of an IRA. Check your plan's current credited rate before deciding.

6. The still-working RMD delay (current employer plans only)

If you're still working and participating in your current employer's 401(k), you can delay required minimum distributions from that plan until April 1 of the year after you fully retire — even if you've passed age 73. This "still-working exception" does not apply to IRA accounts and does not apply to former employers' 401(k) plans. An old 401(k) sitting with a former employer is subject to RMDs at 73/75 regardless of your employment status.⁵

If you're currently employed and have an old 401(k) from a past job, one option is to roll it into your current employer's plan (if the plan accepts rollovers) to extend the RMD delay to the full balance. Whether this is better than rolling to an IRA depends on the other factors in this guide.

When rolling to an IRA is the right call

Investment flexibility and fund costs

The average 401(k) plan offers 10–20 investment options, chosen by the plan sponsor, often tilted toward proprietary or revenue-sharing funds. The average plan expense ratio is around 0.50–0.95%. An IRA at a discount broker (Fidelity, Vanguard, Schwab) gives you access to tens of thousands of ETFs and mutual funds, with index funds available at 0–0.10%.

On a $600,000 rollover, the difference between 0.80% and 0.05% in annual expenses is $4,500/year in extra cost — compounding against you over time. Over 20 years that fee drag can cost $150,000+ in after-fee wealth. If your 401(k) has poor fund selection and high fees, rolling to an IRA and picking low-cost index funds is probably the single highest-return financial move available.

Check your plan documents or Brightscope.com to see your plan's total annual costs.

Roth conversion access

Traditional IRAs can be converted to Roth at any time — you pay ordinary income tax on the converted amount, then future growth is tax-free. Most 401(k) plans do not allow in-plan Roth conversions (a few do). If your Roth conversion window is now — a low-income gap year, a retired-early transition period, the gap before Social Security — you may need the money inside an IRA to execute it. See our Roth conversion after rollover guide for bracket targeting and the IRMAA cliffs to watch.

Estate planning and beneficiary flexibility

IRA beneficiary designations are more flexible than 401(k) designations. You can name multiple primary and contingent beneficiaries with specific percentages, use trusts, establish inherited-IRA setups for non-spouse beneficiaries, and more. Many 401(k) plans have simpler beneficiary designation forms and may require spousal consent for non-spouse beneficiaries. If estate planning is a priority and your balance is large, an IRA typically gives your estate planner more tools to work with.

Consolidation

If you have multiple old 401(k)s scattered across former employers, leaving them in place multiplies your administrative burden: separate logins, separate RMD tracking, separate investment decisions, and sometimes plan fees charged to small balances. Rolling into a single IRA simplifies your financial life and makes asset allocation coherent. See our multi-account consolidation guide for the mechanics.

Interactive decision checklist

Check every item that applies to your situation. The tool counts stay vs. roll factors and gives you a recommendation — but the recommendation is a starting point, not financial advice.

The hybrid approach: don't treat this as all-or-nothing

Several of the "stay" reasons above apply only to a specific subset of your plan balance:

• NUA: Roll everything except the employer stock. Distribute the employer stock in-kind and roll the cash/funds portion to an IRA.
• Rule of 55: Keep enough in the 401(k) to cover your income needs until 59½. Roll the excess to an IRA for better investment options.
• Pro-rata / backdoor Roth: Keep all pre-tax money in the 401(k) (or roll it into your current employer's plan). Then the IRA stays clean for non-deductible contributions.

You're not forced to make a single binary decision. A fee-only advisor can help you model which combination of moves optimizes your specific situation.

Comparison summary

A note: you usually can't roll out of a current employer's plan

This entire guide assumes you've left the employer. Most 401(k) plans don't allow "in-service" distributions — you can't roll your current employer's active 401(k) into an IRA while still employed. Some plans allow in-service rollovers after age 59½ or from specific sources (after-tax contributions). Check your Summary Plan Description (SPD) or ask your HR/benefits team.

1. ERISA anti-alienation rule — 29 U.S.C. § 1056(d); DOL ERISA overview
2. IRA federal bankruptcy exemption — 11 U.S.C. § 522(d)(12); indexed to $1,711,975 effective April 2025 per Ed Slott & Company, April 2025
3. NUA rules — IRC § 402(e)(4); IRS Publication 575, "Pension and Annuity Income"; values verified 2026
4. Pro-rata rule — IRC § 408(d)(2); IRS Form 8606 instructions; IRS Pub. 590-B
5. Still-working exception for RMDs — IRS RMD FAQs; SECURE 2.0 § 107 (RMD ages 73/75); applies only to current employer plan
6. Rule of 55 — IRC § 72(t)(2)(A)(v); IRS Topic 558: Additional Tax on Early Distributions

Verified against 2026 rules. IRA bankruptcy exemption: $1,711,975 (effective April 1, 2025–March 31, 2028 per 11 U.S.C. § 522). RMD ages per SECURE 2.0, current through 2026.