Should I Roll Over My 401(k)? A Decision Framework

The rollover decision looks simple but has six hidden factors most advisors skip. Work through the checklist below — each "yes" answer surfaces a specific risk or opportunity worth $10K–$200K.

What this page covers. You have four options when you leave a job or retire: roll to a traditional IRA, roll to your new employer's 401(k), leave money in the old 401(k), or convert to a Roth IRA (or a combination). The default "just roll it to an IRA" advice misses factors that matter enormously for specific situations. The six questions below identify which factors apply to yours.

Six-Question Decision Checklist

Answer each question. Relevant considerations appear automatically.

1. Are you between age 55 and 59½, and might you need income before turning 59½?

Yes No

Rule of 55 alert. Under IRC § 72(t)(2)(A)(v), if you separated from service in or after the calendar year you turned 55, you can take 401(k) distributions penalty-free without waiting until 59½. Rolling to an IRA permanently forfeits this exception — IRAs don't have it. If you need bridge income between 55 and 59½, either leave the 401(k) in place or roll only the portion you won't need. A partial rollover preserves the exception on the remaining balance. Full Rule of 55 guide →

Rule of 55 isn't a factor for you. Continue through the remaining questions.

2. Does your 401(k) hold highly appreciated employer stock (low cost basis, large unrealized gain)?

Yes No

NUA opportunity — do not roll before evaluating. Under IRC § 402(e)(4), if you take employer stock in-kind rather than rolling it, you pay ordinary income tax only on the cost basis; the Net Unrealized Appreciation converts to long-term capital gains (automatically — no 1-year holding required). For stock with a small basis and a large gain, the LTCG rate on the NUA (15–23.8% including NIIT) can be far cheaper than IRA ordinary income rates (22–37%) on the same money. This is a one-shot, irreversible election requiring a lump-sum distribution. Model your numbers before rolling anything. NUA Calculator →

No employer stock — NUA isn't relevant. Continue.

3. Do you or your spouse do Backdoor Roth IRA contributions (non-deductible IRA contribution → Roth conversion)?

Yes No

Pro-rata rule trap. Rolling pre-tax 401(k) money into a traditional IRA introduces pre-tax basis into your IRA pool. Under IRC § 408(d)(2), all your traditional IRAs are treated as one account for Roth conversion purposes — so each dollar you convert becomes partially taxable based on the pre-tax/after-tax ratio. A $850K 401(k) rollover into an IRA that already has a $7,000 after-tax contribution means your backdoor Roth conversion is 99.2% taxable. Fix options: (a) leave pre-tax 401(k) money in the old plan or roll to new employer 401(k); (b) do a reverse rollover of existing IRA money back into your 401(k) to zero out the IRA balance before converting. Backdoor Roth + pro-rata guide →

Pro-rata rule is not a concern for you. Continue.

4. Do you have an outstanding loan in your old 401(k)?

Yes No

Loan offset — you may have until October 15 to fix this. When you leave a job with an outstanding 401(k) loan, the plan offsets the unpaid balance against your account (a "qualified plan loan offset" or QPLO). Without action, the offset amount is a taxable distribution — plus a 10% penalty if you're under 59½. A $30,000 loan balance could cost $11,000–$13,000 in taxes and penalties. However, under IRC § 402(c)(3)(C) (as amended by TCJA 2017), you have until your tax filing due date — including extensions, typically October 15 of the following year — to roll the offset amount to an IRA or new 401(k) and avoid the tax hit. Loan offset rollover guide →

No outstanding loan. Continue.

5. Does your old 401(k) have an expense ratio below 0.20% (low-cost institutional index funds)?

Yes No

Fee advantage — leaving may make sense here. Large employer plans at mega-corporations often carry institutional share classes (Vanguard Institutional Plus, Fidelity Advantage) with expense ratios of 0.02–0.05%. A $700,000 account at 0.04% costs $280/year in fund fees; the same balance in a typical retail IRA at 0.10% costs $700/year. The difference compounds. If your old plan is genuinely cheap, factor fees into the decision. Use the rollover decision calculator to model the dollar impact over your investment horizon.

High-cost old plan is an argument for rolling to a low-cost IRA (Fidelity, Schwab, Vanguard). Continue.

6. Are you still working (not yet retired or left the job), and are you 59½ or older?

Yes No

In-service rollover may be available. If your plan allows it (not all do), you can roll your 401(k) to an IRA while still employed, without leaving your job. This opens Roth conversions, lower-cost funds, and more flexible investment options — potentially years before you'd otherwise act. Doing this at 59½ versus 63 can mean 4 extra years of Roth conversion at lower rates. Your plan documents or HR can confirm eligibility. In-service rollover guide →

In-service rollover isn't relevant — you've already separated from the employer.

The Four Options: Quick Comparison

Option	ERISA creditor protection	Penalty-free before 59½	Investment choice	Backdoor Roth safe	RMDs while working
Leave in old 401(k)	✓ Unlimited (29 U.S.C. § 1056)	✓ Rule of 55 preserved	Old plan menu only	✓ Pre-tax stays out of IRA	✓ No RMD at old employer
Roll to new 401(k)	✓ Unlimited	✗ Loses Rule of 55 on old plan¹	New plan menu only	✓ Pre-tax stays out of IRA	✓ No RMD while still working
Roll to traditional IRA	$1,711,975 cap (11 U.S.C. § 522(n), eff. Apr 2025)²	✗ Rule of 55 forfeited	✓ Full universe — ETFs, funds, individual stocks	⚠ Pro-rata rule applies	N/A — you left
Convert to Roth IRA	$1,711,975 cap	✗ Rule of 55 forfeited; 5-yr per-conversion clock	✓ Full universe	✓ Pre-tax cleared on conversion	No lifetime RMDs (post-SECURE 2.0 § 325)

¹ Rolling an existing 401(k) balance to a new employer 401(k) severs the Rule of 55 exception on that money. The exception is tied to the plan you separate from, not where the money ends up. ² IRA creditor protection under 11 U.S.C. § 522(n) is inflation-adjusted every 3 years; $1,711,975 is the cap effective April 1, 2025 per Judicial Conference order.

Three Real Scenarios

Scenario 1: Tech employee, 56, $1.1M in old 401(k), does backdoor Roth

Maria is joining a startup with a thin 401(k). Her old Mega Corp plan has institutional Vanguard index funds at 0.03%. She and her spouse both do backdoor Roth contributions ($7,000 each) annually.

Decision: Rolling to an IRA would (a) trigger the pro-rata rule — her $7,000 after-tax contributions become 0.6% of a $1.1M pre-tax IRA, making the backdoor Roth 99.4% taxable; (b) forfeit Rule of 55 access on $1.1M through age 59½; and (c) gain nothing on fees since the old plan is already rock-bottom. Best option: leave in old plan or roll to new employer 401(k) (if it accepts incoming rollovers and has decent funds). Re-evaluate at 59½ for in-service rollover or when new employer builds a better plan.

Scenario 2: Operations director, 57, $840K, voluntarily leaving job

James is leaving to take 2–3 years off before Social Security at 62. He'll need $70K/year from his 401(k) as bridge income starting immediately. No employer stock; no backdoor Roth (income too high for IRA deduction, doesn't do it).

Decision: Rolling to an IRA forfeits Rule of 55 permanently on this balance. James leaves at 57, so he qualifies — he separated in or after the year he turned 55. Keeping the 401(k) in place lets him take $70K/year penalty-free through 59½. At 59½ he can still roll to an IRA if the plan fees or fund options warrant it. The Rule of 55 exception is worth preserving here; the cost of forfeiting it would be 10% × $70K × 2 years = roughly $14,000 in penalties he didn't have to pay.

Scenario 3: Software engineer, 38, $380K, changing jobs

Priya is moving to a new company. Old plan has mid-tier funds at 0.65%. New employer has excellent Vanguard index options at 0.04%. No employer stock; no backdoor Roth concerns (high income, but new employer plan will keep pre-tax money out of IRAs).

Decision: Two viable options: roll to new 401(k) (simplifies, maintains ERISA protection, new plan has low-cost funds) or roll to Fidelity/Schwab IRA (maximum flexibility). At 38 the Rule of 55 isn't relevant, no NUA, no loan. Fee difference between new 401(k) at 0.04% and an IRA at 0.10% is trivial. Rolling to IRA gives more investment choice; rolling to new 401(k) preserves unlimited ERISA creditor protection and keeps things simple. Either is reasonable — no expensive hidden traps apply here.

Red Flags When Working With Advisors

Recommends rolling without checking Rule of 55. If you're 55–59½, this is the first question. Any advisor who doesn't ask is skipping analysis that matters.
Recommends rolling without checking employer stock. The NUA election is one-shot and irreversible. Rolling appreciated employer stock into an IRA converts a future long-term capital gain into ordinary income at withdrawal — potentially a permanent, six-figure mistake.
Commission-based advisor recommending rollover to an IRA they manage. Commissioned advisors earn AUM only if you roll out. Fee-only advisors are indifferent — their advice on rollover vs. leave isn't influenced by where the money lands.
Tells you the 60-day rule makes you fine. Indirect rollovers trigger mandatory 20% federal withholding. You must deposit 100% of the original amount (replacing the withheld portion from other funds) within 60 days or the withheld amount becomes a taxable distribution. Direct vs indirect rollover guide →

The Partial Rollover Strategy

Most people treat rollover as all-or-nothing. It isn't. You can roll part of a 401(k) to an IRA (or convert part to Roth) and leave the rest in the old plan. Common uses:

Roll everything except the employer stock tranche (preserve NUA eligibility on that portion)
Roll everything except the amount you'll need before 59½ as bridge income (preserve Rule of 55 on the remainder)
Roll only the after-tax basis to a Roth IRA, leave pre-tax money in the 401(k) (IRS Notice 2014-54 split rollover)

A specialist advisor runs the math on all three variants for your specific numbers. Generic online calculators don't model partial rollovers or after-tax basis splits.

All specialist guides

Run your specific numbers with a specialist

The framework above surfaces the factors. A fee-only advisor who specializes in rollover decisions runs your actual numbers — balance, tax bracket, ages, employer stock basis, loan balance — and tells you exactly which options apply and what they're worth. Free match, no obligation.

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Sources

Values and statutory citations verified as of April 2026. IRA bankruptcy cap ($1,711,975) per Judicial Conference order effective April 1, 2025 per 11 U.S.C. § 522(n) triennial adjustment.

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