401(k) to SEP IRA Rollover: Rules, Limits, and When the Simplified Employee Pension Beats the Solo 401(k)
You've just left a corporate job for self-employment. Your old employer's 401(k) needs to go somewhere. The two most common self-employed destinations — a traditional IRA and a solo 401(k) — get most of the attention, but there's a third option: a SEP IRA (Simplified Employee Pension). In the right circumstances it's simpler, nearly as powerful, and easier to maintain. In the wrong ones, it quietly destroys your Backdoor Roth strategy.
Can you roll a 401(k) to a SEP IRA?
Yes. A SEP IRA is established under IRC § 408(k), which describes it as a form of individual retirement account — the same underlying structure as a traditional IRA. Under IRC § 402(c), a 401(k) distribution can be rolled over tax-free to any "eligible retirement plan," which includes any individual retirement account described in § 408(a) or (b).1 SEP IRAs qualify.
In practice, this means:
- A direct rollover from your old 401(k) to your SEP IRA is completely tax-free — no 20% mandatory withholding, no 60-day clock
- The rollover amount is not counted against the annual SEP employer contribution limit — rollovers and employer contributions are tracked separately2
- Once inside the SEP IRA, the rolled-over money follows traditional IRA rules: subject to RMDs (starting at age 73 or 75 depending on birth year under SECURE 2.0), eligible for Roth conversions, and — critically — included in the pro-rata calculation
What a SEP IRA is — and isn't
Three defining features distinguish the SEP IRA from a traditional IRA and a solo 401(k):
Employer contributions only — no employee deferral. Unlike a 401(k), you cannot make an "employee" salary deferral to a SEP IRA. All SEP contributions come from you as the employer. For 2026, contributions are limited to the lesser of $72,000 or 25% of compensation — 25% of W-2 wages for S-corp owner-employees, or approximately 20% of net self-employment income for sole proprietors and single-member LLCs (the actual calculation: 25% ÷ 1.25, because net SE income is first reduced by the SE tax deduction). The compensation considered is capped at $360,000 in 2026.3 There are no catch-up contributions — unlike the 401(k)'s $8,000 catch-up at age 50+.
No Roth SEP IRA option. All SEP contributions go in pre-tax. There is no Roth version of a SEP IRA. If you want Roth growth, you convert separately — moving money from the SEP IRA to a Roth IRA and paying income tax on the conversion amount.
No loans. A SEP IRA has no loan provision. If you need early access to funds, your options are a 10% early withdrawal penalty (under age 59½), SEPP 72(t) distributions, or a Roth conversion ladder with a 5-year wait.
2026 SEP IRA contribution limits
| Parameter | 2026 Value | Source |
|---|---|---|
| Maximum SEP contribution | $72,000 | IRS Rev. Proc. 2025-67 (IR-2025-244) |
| Contribution rate | 25% of W-2 comp (S-corp) / ~20% of net SE income (self-employed) | IRC § 408(k)(3)(A) |
| Compensation cap | $360,000 | IRS Rev. Proc. 2025-67 |
| Minimum compensation (prototype plan eligibility) | $750 | IRC § 408(k)(2)(C) |
| Catch-up contributions (age 50+) | None — SEP IRA has no catch-up | IRC § 408(k) |
SEP IRA vs. solo 401(k) vs. traditional IRA — full comparison
| Feature | SEP IRA | Solo 401(k) | Traditional IRA |
|---|---|---|---|
| 2026 max contribution | $72,000 employer only | $72,000 combined (§ 415(c)); employee deferral $24,500 ($32,500 age 50+; $35,750 age 60–63) | $7,500 / $8,500 age 50+ |
| Roth option | No | Yes — Roth solo 401(k) | No (convert to Roth IRA separately) |
| Loans allowed | No | Yes — IRC § 72(p) | No |
| Counts in pro-rata rule? | Yes — aggregated as traditional IRA | No — 401(k) plans are excluded | Yes — aggregated |
| Can cover employees? | Yes — must cover all eligible employees at the same % of compensation | No — only owner and spouse | N/A (personal account) |
| Annual filing required | None | Form 5500-EZ if balance ever exceeded $250K at year-end | None |
| Contribution deadline | Tax filing due date (Oct 15 with extension) | Plan must be established by Dec 31; employee deferral election by Dec 31; employer profit-sharing by tax due date | Tax filing due date (Apr 15, no extension) |
| Setup complexity | Low — open at any brokerage, no plan document renewal | Moderate — plan document required, updated periodically | Low — open at any brokerage |
| ERISA creditor protection | No — state-law IRA protection only (federal bankruptcy exemption ~$1.5M+, inflation-adjusted) | Yes — federal unlimited under ERISA | No — state-law only |
| Accepts incoming 401(k) rollover | Yes | Yes (most plan documents allow it) | Yes |
The pro-rata trap: the reason most high earners skip the SEP IRA
This is the most consequential thing to understand before rolling your 401(k) into a SEP IRA. The IRS aggregates all pre-tax traditional IRA balances when calculating the taxable fraction of a Roth conversion or Backdoor Roth contribution — and a SEP IRA is a traditional IRA for this purpose.4
The Backdoor Roth strategy works when your only IRA is a $7,500 non-deductible contribution: you contribute after-tax, then convert, and the conversion is tax-free. But if you have $300,000 in a SEP IRA from a 401(k) rollover, the IRS aggregates your total IRA balance to $307,500 — of which only $7,500 (2.4%) is after-tax. Your Roth conversion is 97.6% taxable: you owe income tax on roughly $7,325 instead of $0.
If you are already doing — or plan to do — Backdoor Roth contributions, a SEP IRA as a 401(k) rollover destination is likely the wrong choice. The clean alternatives are a solo 401(k) or your new employer's 401(k) plan — 401(k) balances are excluded from the pro-rata calculation. See the Backdoor Roth pro-rata guide for the complete mechanics.
When a SEP IRA is the right rollover destination
Four specific circumstances favor the SEP IRA over the alternatives:
1. You have non-owner, non-spouse employees. A solo 401(k) can only cover you and your spouse. The moment you hire an employee who works 1,000+ hours per year, the solo 401(k) is no longer available as a one-participant plan. A SEP IRA covers all eligible employees — though at the same contribution percentage across the board. If you want a plan that scales with a small team, the SEP IRA is the natural choice.
2. You are not doing — and will never do — Backdoor Roth. If your income is too high for a deductible IRA and you have no interest in the non-deductible Backdoor Roth strategy, the pro-rata trap is irrelevant. In that case the SEP IRA's simplicity wins.
3. Your income is high enough that SEP and solo 401(k) reach the same maximum. At roughly $360,000 in net SE income for a sole proprietor (or $288,000 W-2 for an S-corp owner), both plans hit the $72,000 § 415(c) ceiling. The solo 401(k) stops having a dollar advantage at that point. The SEP IRA's simplicity — no plan document renewal, no Form 5500-EZ, no annual compliance filings — becomes a real benefit.
4. You need a plan in the first year and missed the solo 401(k) deadline. You can fund a SEP IRA as late as your tax filing due date — including extensions, typically October 15 — for the year the contributions apply. A solo 401(k) must be established by December 31 of the contribution year. If it's already Q1 of the following year, a SEP IRA may still be available when the solo 401(k) window has closed.
When NOT to roll into a SEP IRA
| Situation | Why SEP IRA is the wrong choice | Better option |
|---|---|---|
| You do (or plan to do) Backdoor Roth | SEP IRA balance triggers pro-rata on every Roth conversion and Backdoor Roth contribution, making each one partially taxable | Solo 401(k) or new employer's 401(k) — 401(k) balances are excluded from pro-rata |
| You want pre-retirement access flexibility | No loan provision in a SEP IRA | Solo 401(k) with loan provision per IRC § 72(p) |
| You want Roth contributions going forward | No Roth SEP IRA option exists | Roth solo 401(k), or separate Roth IRA contributions alongside the SEP |
| Your income is moderate (under ~$240K net SE) | At $100K net SE income, SEP IRA max is ~$20K vs. ~$44,500 with solo 401(k) employee deferral + profit-sharing; the employee deferral component is the key difference | Solo 401(k) produces materially more retirement savings at moderate incomes |
| You need creditor protection (large balance) | SEP IRA has state-law protection only; federal bankruptcy exemption is ~$1.5M+ (inflation-adjusted), which may not cover a large rollover balance | Solo 401(k) or employer 401(k) with unlimited federal ERISA protection |
How to roll your 401(k) into a SEP IRA: step by step
- Open a SEP IRA at your brokerage of choice. Fidelity, Vanguard, Schwab, and most major custodians offer SEP IRAs with no setup fees. You'll sign an IRS Form 5305-SEP or 5305A-SEP adopting agreement (or a prototype plan from your brokerage). If you already have a SEP IRA from prior years, you use the same account — no new account needed just for the rollover.
- Request a direct rollover from your old 401(k). Contact your old employer's plan administrator and request a "direct rollover to an IRA." The check should be made payable to your IRA custodian FBO (for benefit of) your name, not to you directly. A check payable to you triggers mandatory 20% federal withholding. See direct vs. indirect rollover for the full mechanic.
- Deposit the rollover into your SEP IRA. Deliver the FBO check or wire per your custodian's instructions. Designate it as a rollover contribution — not an employer SEP contribution — so it is not counted against the annual $72,000 SEP limit.
- Verify on Form 5498. By May 31 of the following year, your custodian will issue Form 5498. The rollover should appear in Box 2 (rollover contributions), not Box 8 (SEP contributions). Keep this alongside the Form 1099-R (distribution code G for a direct rollover) from your old plan.
- Confirm your Backdoor Roth status. If you plan to do Backdoor Roth contributions in the same or future years, this rollover may have created a pro-rata problem. See below for the reverse rollover fix.
Fixing a SEP IRA pro-rata problem: the reverse rollover
If you rolled your 401(k) to a SEP IRA and now realize it's blocking your Backdoor Roth, there is a clean solution. Under IRC § 408(d)(3)(A), you can roll pre-tax SEP IRA balances into a new employer's 401(k) or solo 401(k) plan — if the plan document accepts incoming IRA rollovers (most custodian-provided solo 401(k) plans do).5 Moving the SEP IRA balance into a 401(k) removes it from the pro-rata aggregation, restoring a clean Backdoor Roth pathway. See the reverse rollover guide for the full step-by-step process.
Three real scenarios
Scenario A: Marketing consultant (38) with employees — SEP IRA is the right call
James left his agency job (with $180,000 in his 401(k)) and started an independent marketing consultancy. He now has three part-time employees who each work about 1,200 hours per year and earn more than $750 annually from his business — which means they are eligible for any SEP IRA he establishes. A solo 401(k) is off the table; it cannot cover employees who aren't owners or spouses.
He rolls his $180,000 401(k) directly to a SEP IRA at Vanguard. His 2026 net self-employment income is $220,000. His SEP contribution: 20% × $220,000 = $44,000 for himself. He does not do Backdoor Roth — at his income level and with a large pre-tax balance, it's not part of his strategy. He covers his three employees at the same 20% rate — a total employer cost of roughly $15,000 across the three, which he factors into his compensation structure. No annual filings, no plan document to renew, no TPA needed. The SEP IRA was the right choice.
Scenario B: Software engineer (42) going independent — wrong choice, reversed
Priya left a large tech company with $620,000 in her 401(k) and began freelancing. She opens a SEP IRA at Fidelity and rolls the $620,000 in. That same year, she contributes $7,500 to a non-deductible traditional IRA and plans to convert to Roth (Backdoor Roth). Her total IRA balance at year-end: $627,500. After-tax fraction: $7,500 / $627,500 = 1.2%. Tax-free portion of her Roth conversion: $90. She owes income tax on $7,410 — at her 37% marginal rate, that's $2,742 in avoidable tax this year and every future year.
She reverses the mistake: she opens a solo 401(k) at Fidelity (no employees, no problem), which accepts incoming IRA rollovers under its plan document. She rolls the $620,000 SEP IRA balance into the new solo 401(k). Her IRA balance drops to $7,500 (the non-deductible contribution made this year). She completes the Backdoor Roth conversion — now 98.8% tax-free. Going forward, the solo 401(k) holds the rollover assets plus new employer profit-sharing contributions. Backdoor Roth is fully clean. See the solo 401(k) rollover guide for plan establishment details.
Scenario C: Independent architect (58) earning $400K+ — simplicity wins
Carolyn left her architecture firm at 58 with $850,000 in her 401(k). She's consulting independently as an S-corp, paying herself a $300,000 W-2 salary, and expects to work another seven years. She has never done Backdoor Roth (she was above the income limits for deductible IRA contributions for years, and she has no interest in the non-deductible strategy given her large pre-tax account). She wants maximum simplicity: no plan documents to maintain, no Form 5500-EZ, no compliance filings.
She rolls $850,000 to a SEP IRA at Schwab. Her 2026 SEP contribution: 25% × $300,000 = $75,000 — but the § 415(c) limit is $72,000, so she contributes the maximum. Over seven years at $72,000/year, she adds $504,000 in new SEP contributions on top of the $850,000 rollover. She's 58 — the Rule of 55 is not a factor (she's past 59½ in two years anyway, and she's not leaving a 401(k) employer). No annual filings, no plan document renewal. The SEP IRA was the right call: same maximum as a solo 401(k) at her income, zero administrative overhead, no pro-rata conflict.
Get matched with a fee-only advisor for your rollover destination decision
The SEP IRA vs. solo 401(k) vs. traditional IRA decision is particularly consequential if Backdoor Roth is in your picture. Getting the pro-rata math wrong creates recurring avoidable tax. Our matched advisors help self-employed clients choose the right rollover destination, fix pro-rata problems via reverse rollover, and structure their first year of self-employed contributions.
- IRS: Rollovers of Retirement Plan and IRA Distributions — 401(k) plans may roll to any "eligible retirement plan" under IRC § 402(c), including IRAs under § 408(a)/(b); SEP IRAs qualify under § 408(k). Direct rollovers carry no withholding and no 60-day clock.
- IRS Rollover Compatibility Chart — official matrix confirming 401(k) → SEP IRA direct rollovers are permitted; rollover contributions do not count against the annual SEP employer contribution ceiling.
- IRS IR-2025-244: 2026 Retirement Plan Contribution Limits — SEP IRA maximum $72,000; § 415(c) annual additions limit $72,000; compensation limit $360,000; IRA limit $7,500 ($8,500 age 50+). Per IRS Rev. Proc. 2025-67.
- IRS Publication 590-B: Distributions from Individual Retirement Arrangements — IRC § 408(d)(2) pro-rata rule: all pre-tax IRA balances (traditional IRAs and SEP IRAs) are aggregated to determine the taxable fraction of any Roth conversion or distribution. SEP IRA balances are included.
- IRS FAQs: IRA Rollovers and Roth Conversions — pre-tax traditional IRA and SEP IRA balances may be rolled to a 401(k) or solo 401(k) that accepts incoming rollovers (the "reverse rollover"), removing them from the pro-rata calculation for future Backdoor Roth contributions.
Contribution limits verified May 2026 against IRS Rev. Proc. 2025-67 (IRS IR-2025-244). Pro-rata and rollover rules per IRC §§ 402(c), 408(d)(2), 408(k).