Retirement accounts come with many rules—and making the wrong move could cost you in taxes, penalties, or lost benefits. One common question self-employed business owners ask is: Can I roll my Solo 401(k) into a SEP IRA? The answer is yes—but whether it makes sense depends on your situation.
Watch: Learn if it Makes Sense to Rollover a Solo 401k to a SEP IRA and the Rules
Understanding the Basics
Solo 401(k)
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Designed for owner-only businesses with no full-time W-2 employees; learn more about the solo 401k eligibility requirements HERE.
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Allows both employee and employer contributions, as well as voluntary after-tax contributions.
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Supports advanced strategies like the Mega Backdoor Roth.
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Participant loans are permitted.
SEP IRA
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Can be used by self-employed individuals and businesses with employees.
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Only employer contributions are allowed.
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If you have full-time W-2 employees, you must make proportional SEP contributions for them.
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Does not permit loans or the mega backdoor Roth strategy.
Is a Solo 401(k) to SEP IRA Rollover Allowed?
Yes, the IRS allows you to roll a Solo 401(k) into a SEP IRA
This can happen in situations such as:
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Business Growth: If you hire full-time W-2 employees, you no longer qualify for a Solo 401(k). At that point, rolling funds into a SEP IRA is a way to keep retirement savings tax-deferred.
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Avoiding Form 5500-EZ Filing: Once a Solo 401(k) exceeds $250,000 in assets, you must file Form 5500-EZ. Some owners prefer to move funds to a SEP IRA, which has no such filing requirement.
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Simplifying Accounts: Business owners with multiple plans may consolidate into a SEP IRA.
Contribution Limits and Aggregation
If you have both a Solo 401(k) and a SEP IRA for the same business, your contributions are aggregated. For 2025, the combined limit is $70,000 if under age 50. You cannot exceed this cap by contributing to both plans.
Pros and Cons of Rolling Into a SEP IRA
Pros
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No Form 5500-EZ filing requirement.
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Works if you hire employees (you can cover them with SEP contributions).
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Simpler structure for some businesses.
Cons
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No employee contributions (limits overall savings potential).
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No participant loans.
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No Mega Backdoor Roth option.
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SEP IRA real estate investments using debt may trigger Unrelated Debt-Financed Income Tax (UDFI), unlike Solo 401(k)s.
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No access to the Auto Contribution Tax Credit.
Alternatives to Consider
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Traditional or Self-Directed IRA: If you don’t want the obligation of contributing to employees’ retirement, moving your Solo 401(k) into an IRA may be better.
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Staying with a Solo 401(k): If you still qualify (no full-time employees), keeping your Solo 401(k) may offer more flexibility and tax advantages.
Key Takeaways
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You can roll a Solo 401(k) into a SEP IRA.
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It usually makes sense only if your business grows to include full-time employees or if you want to avoid Form 5500-EZ filings.
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Be mindful of the trade-offs: a Solo 401(k) generally offers more flexibility and benefits than a SEP IRA.
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Always evaluate tax implications and long-term retirement goals before making the switch.
✅ Bottom line: Rolling a Solo 401(k) into a SEP IRA is possible, but it’s not always the best move. For many business owners, keeping the Solo 401(k) or rolling into a Traditional IRA may be a smarter choice.
