Partial 401(k) Rollover to IRA: When Rolling Only Part Makes Sense

You don't have to roll your entire 401(k) to an IRA when you leave a job. A partial rollover — moving only a portion of your balance while leaving the rest in the plan (or redirecting parts to different destinations) — is often the smarter move. Five situations in particular call for it: NUA-eligible company stock, after-tax contributions eligible for Roth, a need for penalty-free pre-59½ income under the Rule of 55, backdoor Roth hygiene, and superior plan investment options worth keeping.

The challenge: partial rollover mechanics are governed by both IRS rules and your specific plan document, and the two interact in ways that trip people up. This guide explains when a partial rollover beats a full one, how money-type ordering works, and the step-by-step execution process.

What a Partial Rollover Is

A partial rollover means requesting a distribution of less than your full 401(k) balance and rolling those dollars to an IRA (or other eligible plan), while the remaining balance stays in the original plan. The IRS explicitly permits partial rollovers — there is no minimum or maximum percentage requirement.¹

The term also covers "split rollovers" — distributing your entire balance but directing different money types to different accounts. The most common example: rolling pre-tax dollars to a traditional IRA and after-tax (non-Roth) dollars simultaneously to a Roth IRA, using IRS Notice 2014-54.²

Type	What it means	Primary reason
Partial (amount)	Roll X dollars, leave Y dollars in plan	NUA stock, Rule of 55, plan investment quality
Split (destination)	Roll full balance to two accounts	After-tax basis to Roth, pre-tax to traditional
Both	Roll partial amount, split by money type	NUA + after-tax basis both present in plan

5 Scenarios Where a Partial Rollover Beats a Full One

1. You have NUA-eligible company stock

If your 401(k) holds appreciated company stock, the Net Unrealized Appreciation (NUA) strategy under IRC § 402(e)(4) can convert what would be ordinary income taxes on the full stock value into long-term capital gains taxes on the appreciation — a potential savings of 20+ percentage points.³

The mechanics require a "lump sum distribution" — you must take all employer securities in your plan as an in-kind distribution to a taxable brokerage account. The rest of the plan balance (non-stock funds) gets rolled to an IRA in the same tax year. This is effectively a forced partial structure: the stock goes out in kind; everything else rolls over.

Critical NUA trap. If you roll company stock to an IRA, the NUA election is permanently lost. Once those shares sit inside an IRA, all future distributions — including the appreciation — become ordinary income. See our NUA strategy guide to model whether the tax savings justify the immediate cost-basis tax.

Who benefits most: employees with stock that has appreciated 3×+ from its cost basis inside the plan, especially those in the 22–24% income bracket who expect long-term capital gains taxed at 0–15%.

2. You have after-tax (non-Roth) contributions

Many large 401(k) plans accept after-tax contributions beyond the pre-tax deferral limit. When you leave, IRS Notice 2014-54 (the "split rollover" guidance) lets you direct this after-tax basis to a Roth IRA tax-free — while the pre-tax balance and earnings roll to a traditional IRA.²

This is not a partial rollover by amount — you're rolling the full balance — but it's a split-destination rollover that IRS rules explicitly permit. The after-tax amount goes to Roth IRA; the pre-tax amount goes to traditional IRA. No tax is owed on the Roth portion because you already paid tax on those contributions.

See the dedicated after-tax 401(k) rollover guide for the full mechanics and a calculator.

3. You need penalty-free income before age 59½ (Rule of 55)

If you leave your employer in the year you turn 55 or later (age 50+ for public safety employees under IRC § 72(t)(2)(B)), you can take distributions from that employer's 401(k) without the 10% early withdrawal penalty.⁴ This exception applies only while the money remains in the qualified plan. Once you roll it to an IRA, it disappears.

Strategy: roll only the amount you don't expect to need before age 59½. Keep the rest in the plan for penalty-free access. When you turn 59½, you can roll the remaining balance without penalty.

Scenario	Best structure
Need $30K/year between ages 56–59 from your $1.2M plan	Leave $120K–$150K in plan for Rule of 55 access; roll $1.05M to IRA
No income need before 59½	Full rollover — no Rule of 55 benefit to preserve
Retired at 53 — Rule of 55 doesn't apply yet	Consider SEPP (72(t)) from IRA; Rule of 55 is irrelevant here

Rule of 55 pitfall. The exception applies only to your current employer's plan — the one you're separating from in that calendar year. Old 401(k)s from previous employers, IRAs, and Roth IRAs do not qualify. If you consolidate old plans into the current employer's plan before leaving, those funds inherit the exception. But once anything leaves the plan, the Rule of 55 window closes on that portion forever.

4. You need a clean IRA for backdoor Roth contributions

The backdoor Roth strategy — contributing $7,500/$8,600 (age 50+) to a non-deductible traditional IRA and immediately converting to Roth — works tax-free only if you have zero pre-tax IRA balance on December 31. Any pre-tax IRA balance triggers the pro-rata rule, making part of the conversion taxable.⁵

Rolling a large 401(k) to a traditional IRA poisons the pool. If you're a high earner who relies on backdoor Roth, the right move may be to roll your 401(k) to your new employer's plan instead of an IRA — or to roll only the Roth 401(k) portion to a Roth IRA, keeping your traditional IRA pool empty.

If your plan won't accept incoming rollovers and you're stuck with an IRA, a reverse rollover (rolling the IRA into the new employer's 401k) may restore the clean-IRA structure. See the reverse rollover guide.

5. Your plan has superior investment options or a stable value fund

Institutional 401(k) plans at large employers sometimes offer share classes of index funds 0.02–0.10% cheaper than the retail share classes available in IRAs. On a $1M balance, that's $200–$1,000/year in extra returns. And some plans offer stable value funds — which typically yield 4–5% with no duration risk and no principal volatility — that are entirely unavailable in IRAs (IRAs can hold money market funds and short-term bond funds, but not true insurance-backed stable value contracts).

For these situations, keeping a portion of the balance in the plan while rolling the rest to an IRA gives you the best of both worlds: IRA flexibility and investment breadth for most of the portfolio, plus the institutional fund or stable value fund for the portion that benefits most from it.

Plan Rules: Does Your Plan Allow Partial Distributions?

Whether you can do a partial rollover depends on your plan document — not just IRS rules. The IRS permits partial rollovers; your plan may or may not.

Plan type	Typical partial distribution rules
Large corporate 401(k) (Fidelity, Vanguard, Empower, etc.)	Usually allowed; most plans permit partial distributions at separation
Small employer plan (SIMPLE, solo 401k)	Often allowed but check plan document — some restrict to full distributions only
403(b) — public school/university	Usually allowed; 403(b)(7) custodial accounts more flexible than annuity contracts
Governmental 457(b)	Generally allowed; no mandatory 20% withholding on the distribution itself
Profit-sharing plan / defined contribution pension	Varies — check plan document; some require lump-sum only
Defined benefit pension	Usually no partial — pension distributes as either lump sum or annuity; see pension lump-sum guide

How to find out: Call your plan administrator (the HR contact or benefits line, not the recordkeeper's generic 800 number). Ask: "Does my plan allow partial distributions at separation, and can I specify which money source to distribute?" Also ask whether you can take multiple separate distributions over time, or only one.

Money-Type Ordering in Partial Distributions

401(k) plans typically track several "money types" separately: pre-tax salary deferrals, employer matching contributions, employer nonelective contributions, Roth deferrals, and after-tax (non-Roth) contributions. When you take a partial distribution, which money type comes out first?

The answer: it depends on your plan document.

Source-specific plans: Allow you to designate which money type to distribute. You can request "distribute only after-tax contributions" or "distribute only pre-tax deferrals." This gives you precise control over the tax treatment and destination.
Pro-rata plans: Require any partial distribution to contain a proportional mix of all money types. If 10% of your account is after-tax, 10% of any distribution is after-tax — you can't cherry-pick.
Vesting-restricted plans: Employer contributions that aren't yet vested aren't available for distribution at all. Only your vested balance is distributable.

IRS Notice 2014-54 applies regardless. Even in a pro-rata plan, when you take a distribution containing both after-tax and pre-tax amounts, you can direct the after-tax portion to a Roth IRA and the pre-tax portion to a traditional IRA. The plan's pro-rata rule determines how much is after-tax; Notice 2014-54 governs where it goes.²

One important restriction: you cannot take a distribution consisting solely of after-tax contributions and leave all pre-tax amounts in the plan. Any partial distribution from a pro-rata plan must include some pre-tax amounts. Source-specific plans may be more flexible, but verify with your plan administrator.¹

Partial Rollover Decision Tool

Should You Do a Partial or Full Rollover?

Answer 5 questions to get a tailored recommendation. This tool identifies which scenarios apply to your situation.

1. Does your 401(k) include employer stock that has appreciated in value?

Yes — the stock has gone up significantly from my cost basis
No — no employer stock, or the stock has minimal appreciation

2. Did you leave (or will you leave) this employer in the year you turn 55 or older, and do you expect to need income from this account before age 59½?

Yes — I separated at 55+ and need income before 59½
I separated at 55+ but don't expect to need income before 59½
No — I'm under 55, or I don't need pre-59½ income

3. Do you make (or plan to make) backdoor Roth IRA contributions?

Yes — I use backdoor Roth annually or plan to
No — I contribute directly to Roth IRA, or I don't use Roth at all

4. Does your 401(k) include after-tax (non-Roth) contributions — that is, contributions above the pre-tax limit that your plan accepted as after-tax?

Yes — my plan accepted after-tax contributions and I made them
No — only pre-tax and/or Roth 401(k) contributions

5. How do your plan's investment options compare to an IRA?

My plan has better or unique options (institutional funds, stable value fund)
Similar options at similar costs
My plan has high-cost or limited options — IRA is clearly better

Step-by-Step: How to Execute a Partial Rollover

Before you start

Call your plan administrator and ask: (a) Does my plan allow partial distributions after separation? (b) Can I choose which money source to distribute? (c) Can I take multiple distributions over time, or only one?
Check vesting. Only vested balances are distributable. If you're partially vested in employer contributions, calculate your exact vested amount.
Take your RMD first if required. If you are 73 or older (or 75 if born 1960+), you must take your current-year required minimum distribution from the plan before initiating any rollover. RMD amounts cannot be rolled over. See IRA rollover RMD rules.
Open the receiving IRA(s). If you don't already have a traditional IRA or Roth IRA, open the account(s) before requesting the distribution. You need the account number for the direct rollover form.

Execution

Complete the plan's distribution request form. Specify the dollar amount or percentage you want distributed. If your plan allows source-specific distributions, designate the money type. Request a direct rollover (trustee-to-trustee) — do not take a check made out to you.
Designate the receiving institution(s). For a simple partial rollover to one traditional IRA: one destination. For a split rollover (after-tax to Roth IRA, pre-tax to traditional IRA): two destination accounts. The plan's distribution form will ask for the receiving institution's name, account number, and routing information.
Monitor the transfer. Direct rollovers typically take 1–4 weeks depending on the recordkeeper. Track the transfer on both ends — confirm the old plan shows the reduced balance and the new IRA shows the deposit. See our rollover timeline guide for custodian-specific expectations.
Verify the 1099-R. Your former plan will issue a Form 1099-R in January of the following year showing the total distribution and the rollover amount. Box 1 = gross distribution; Box 2a = taxable amount (should be $0 for a clean pre-tax direct rollover to a traditional IRA); Box 7 = distribution code (G = direct rollover; H = direct rollover from Roth).
File Form 8606 if any after-tax basis moved. If you directed after-tax contributions to a Roth IRA, file Form 8606 to document the non-taxable portion. This is how you prove to the IRS that the Roth conversion was tax-free.

Never take an indirect rollover on a partial distribution. If you request a check made out to you — even intending to deposit it within 60 days — the plan must withhold 20% of the gross distribution for federal taxes (IRC § 3405(c)). To roll over the full amount, you would need to make up the withheld 20% from other funds. Indirect rollovers also count against the once-per-year IRA-to-IRA rollover rule (though employer-plan-to-IRA rollovers are exempt from this rule). Always request direct rollover.

6 Common Partial Rollover Mistakes

1. Not checking whether your plan allows partial distributions

Some plans require a full distribution at separation — you roll everything or you leave everything. Discovering this after you've already set up a new IRA is frustrating. Call the plan administrator first, before opening accounts or initiating paperwork.

2. Rolling NUA-eligible company stock before modeling the election

The moment you roll appreciated employer stock to an IRA, the NUA opportunity is gone — permanently. Even if you only roll 50% of the stock, the NUA election under IRC § 402(e)(4) requires taking all employer securities in kind in the same tax year. If you roll some and keep some, you may disqualify the entire election. Model the NUA vs. full rollover comparison before initiating anything. Use the NUA calculator →

3. Rolling in an RMD year without taking the RMD first

Turning 73 (or 75 if born 1960+) the year of your rollover? You must take your required minimum distribution from the plan before rolling any amount to an IRA. Rolling the RMD amount to an IRA makes it an excess IRA contribution, subject to a 6% annual excise tax until corrected. The RMD must come out of the plan as a taxable distribution, period.

4. Losing Rule of 55 access without a bridge plan

Rolling more than you intended from a plan that gave you Rule of 55 access is a hard-to-reverse mistake. Once the money is in an IRA, your only early-access option before 59½ is SEPP (IRC § 72(t)) — a rigid payment schedule you cannot change without triggering retroactive penalties on all prior payments. Before rolling, calculate exactly how much you need to keep in the plan for pre-59½ income, with a buffer. See SEPP guide →

5. Creating a pro-rata problem without realizing it

Rolling pre-tax 401(k) funds to a traditional IRA when you already have a clean IRA (for backdoor Roth) is a one-way door. The pro-rata calculation looks at your total traditional IRA balance on December 31 — you cannot designate which IRA account the rule applies to. One partial rollover of $50K pre-tax funds into an IRA that was previously at zero will make each future backdoor Roth conversion partially taxable. See pro-rata rule guide →

6. Using an indirect rollover and missing the 60-day deadline

Partial or full, indirect rollovers are subject to the 60-day rule. If you take a check and don't deposit it into an eligible account within 60 days, the entire distribution becomes taxable income in that year — plus the 10% early withdrawal penalty if you're under 59½. The IRS can waive this deadline in cases of genuine hardship (Rev. Proc. 2016-47 self-certification), but the waiver is discretionary and must be requested before you file a return claiming the rollover. Just use direct rollover.

When to Get Help on a Partial Rollover

A straightforward partial rollover — roll 80% to a traditional IRA, leave 20% in the plan for Rule of 55 income — is manageable without professional help. But several combinations warrant an advisor review:

NUA + after-tax basis + Rule of 55 all present in the same plan. The sequencing across three strategies with different execution requirements is genuinely complex. A mistake in any one leg can forfeit the benefits of another.
Large plan balance (>$1M) rolling into an IRA when you use backdoor Roth. The pro-rata impact on backdoor Roth conversions is permanent — and may cost thousands per year for decades.
Plan has unique employer stock with NUA opportunity >$200K. The breakeven on the NUA election depends on your tax bracket, the stock's current value vs. cost basis, and how long you plan to hold. Model it carefully before committing.
Nearing RMD age with multiple plans and IRAs. The aggregation and sequencing rules for RMDs across plans and IRAs are different, and doing a partial rollover in the wrong order can create an inadvertent taxable distribution.

Fee-only matters here. Commission-based advisors may have an incentive to recommend a full rollover to an IRA they manage, even when keeping money in the plan (for Rule of 55 or stable value) is better for you. A fee-only fiduciary earns the same regardless of where the money sits.

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Sources

IRS: Rollovers of Retirement Plan and IRA Distributions — permits rolling all or a portion of an eligible distribution; after-tax amounts cannot be distributed alone without some pre-tax in pro-rata plans.
IRS Notice 2014-54: Rollovers of After-Tax Contributions — permits directing after-tax amounts to Roth IRA and pre-tax amounts to traditional IRA in a single distribution.
IRS Topic No. 413: Rollovers from Retirement Plans — IRC § 402(e)(4) NUA election requirements and rollover mechanics.
IRS Rollover Chart — eligible rollover source and destination combinations including partial rollovers; IRC § 72(t)(2)(A)(v) Rule of 55 exception applies only while funds remain in the qualified plan.
IRS Publication 590-B: Distributions from Individual Retirement Arrangements — pro-rata rule mechanics, Form 8606 requirements, and basis tracking for after-tax IRA contributions and rollover amounts.

Values verified as of June 2026. IRC § 72(t)(2)(A)(v) Rule of 55 exception, IRS Notice 2014-54 after-tax rollover rules, and IRC § 402(e)(4) NUA election requirements are established provisions unchanged by recent legislation.