Personal Finance
SEP-IRA vs Solo 401(k): How the Two Self-Employed Retirement Plans Differ (2026)
Updated July 14, 2026
Self-employed owners and single-member businesses can choose between a SEP-IRA and a Solo 401(k) — both let you shelter far more than a regular IRA, but they reach their limits differently. The Solo 401(k) adds an employee deferral on top of an employer contribution and offers a Roth option and catch-up; the SEP-IRA is simpler but employer-funded only. This is how they differ, not a recommendation.
Head-to-head, line by line
| Spec | SEP-IRA | Solo 401(k) |
|---|---|---|
| Max amount | Up to $72,000 | Up to $72,000 |
| Catch-up (50+) | None | $8,000 |
| Roth option | Limited | Yes |
◈ marks the stronger option for that row.
SEP-IRA
Pros
- +Highest simplicity — easy to open, no annual Form 5500 filing at low asset levels
- +Same $72,000 ceiling as a Solo 401(k) for high earners (IRS Notice 2025-67)
- +Flexible — you can vary or skip contributions year to year
- +Works even if you have eligible employees (though you must fund theirs proportionally)
Trade-offs
- –No employee salary deferral, so lower earners hit the cap at higher income than a Solo 401(k)
- –No age-50 catch-up contribution
- –Must contribute the same percentage for any eligible employees
Solo 401(k)
Pros
- +Employee deferral ($24,500) lets moderate earners reach the cap that a SEP-IRA can't at the same income
- +Age-50 catch-up of $8,000 ($11,250 at ages 60-63 in 2026)
- +Roth (after-tax) contributions widely available
- +Loans are permitted from many Solo 401(k) plans
Trade-offs
- –Only for owners with no full-time non-spouse employees
- –More setup and an annual Form 5500-EZ filing once assets exceed $250,000
- –Slightly more paperwork than a SEP-IRA
Which should you pick?
Pick SEP-IRA if:Self-employed owners who want the least administration and fund the plan entirely from the business side.
Pick Solo 401(k) if:Self-employed owners with no full-time employees who want to maximize savings at moderate income or want a Roth bucket.
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Frequently asked
SEP-IRA vs Solo 401(k) — common questions
What is the main difference between a SEP-IRA and a Solo 401(k)?+
Contribution limits and structure. A SEP-IRA allows only employer contributions — up to 25% of net self-employment income or $72,000 in 2026 (whichever is less). A Solo 401(k) allows both employee deferrals ($24,500 in 2026, plus $8,000 catch-up if 50+) and employer profit-sharing contributions, often enabling higher total contributions at lower income levels because the employee deferral isn't limited to a percentage of income. Source: IRS Publication 560 at irs.gov.
Which allows higher contributions — SEP-IRA or Solo 401(k)?+
At lower income levels (under ~$100,000 net self-employment income), the Solo 401(k) typically allows higher contributions because the employee deferral isn't income-percentage-limited. At higher incomes, both approach the same annual cap ($72,000 in 2026). The Solo 401(k) also allows Roth contributions with some providers, and loans against the balance — features SEP-IRAs don't offer. Source: IRS.gov and IRS Publication 560.
Can you have both a SEP-IRA and a Solo 401(k) in the same year?+
You can have both accounts, but you cannot double-contribute beyond the annual addition limit ($72,000 in 2026). The IRS aggregates contributions across plans for the same employer. In practice, most self-employed individuals choose one or the other. If you have employees, the Solo 401(k) is not available (it's restricted to sole proprietors/partnerships with no eligible employees other than a spouse). This is informational — consult a qualified tax advisor for your situation. Source: IRS Publication 560 at irs.gov.
Is a SEP-IRA or Solo 401(k) easier to administer?+
SEP-IRA is simpler: no annual IRS reporting is required until assets exceed $250,000 (at which point Form 5500-SF is required), and setup is straightforward at any major custodian. Solo 401(k) plans require an IRS-approved plan document at setup, and Form 5500-EZ is required annually once assets exceed $250,000. For pure simplicity, SEP-IRA wins; for maximum contribution flexibility, Solo 401(k) is the better structure. Source: IRS.gov.
Independent editorial comparison. ClearValue Lending is not the issuer of any product compared here; affiliate links may pay a referral commission at no cost to you — selection is independent of compensation.