Solo 401(k) had a non-owner employee: Form 5500-EZ hard stop
A hard-stop guide for Solo 401(k) sponsors who hired a non-owner employee and need to check whether one-participant plan status still applies.
Summary
Form 5500-EZ is for one-participant plans and certain foreign plans. If the business has a non-owner employee who affects plan eligibility, the filing may no longer be a simple Solo 401(k) packet. Stop before preparing Form 5500-EZ and review the plan rules with official guidance or a professional.
A non-owner employee can break the simple one-participant-plan assumption.
| Core question | One-participant plan statusDo not assume Solo 401(k) status after hiring. |
|---|---|
| Risk | Wrong form or plan failureEmployee eligibility can change the compliance picture. |
| Product boundary | Hard stopNo coverage, nondiscrimination or eligibility analysis. |
Why this is a hard stop
The product assumes a simple one-participant plan. Hiring a non-owner employee can create eligibility and coverage questions that determine whether the plan is still in the right filing category.
Facts to collect before asking for help
Collect employee hire date, hours, age, service history, ownership relationship, plan eligibility terms, controlled-group facts and any prior plan amendments or notices.
Where the packet stops
Solo 5500 Desk does not decide employee eligibility, coverage testing, controlled-group status or whether another Form 5500 series return is required.
Common questions
Can I use Form 5500-EZ if I hired an employee?
Not automatically. Review whether the plan is still a one-participant plan and whether the employee affects eligibility, coverage or filing obligations.
Does a part-time employee always break Solo 401(k) status?
The answer depends on plan terms, hours, eligibility rules and related-employer facts. That analysis is outside a simple packet workflow.
Can Solo 5500 Desk review employee eligibility?
No. It only supports simple one-participant plan packet preparation. Employee eligibility, controlled group and coverage analysis require official guidance or professional review.
Related guides
Solo 401(k) owner-only eligibility for Form 5500-EZ
The common-law employee question that decides whether a simple one-participant packet is still the right lane.
Do I need to file Form 5500-EZ for my Solo 401(k)?
The direct filing test for one-participant plans: asset threshold, final year, deadline, and filing method.
Solo 401(k) $250,000 threshold for Form 5500-EZ
How the IRS $250,000 one-participant plan asset threshold works for Solo 401(k) Form 5500-EZ filing.