A Solo 401(k) is a powerful retirement plan for self-employed individuals and small business owners without full-time employees. But what happens when your business changes or you’re ready to move on? Closing a Solo 401(k) isn’t as simple as pulling the plug — there are rules, deadlines, and reporting requirements you must follow.
Watch: Learn When and About the IRS Process to Close a Solo 401k
In this post, we’ll explore when and how you can close a Solo 401(k), what situations trigger mandatory closure, and the IRS filings you need to stay compliant.
1. Reasons You May Need to Close a Solo 401(k)
Ceasing Self-Employment
If you shut down your self-employed business, you can no longer maintain a Solo 401(k). Unlike a corporate 401(k) sponsored by an employer that continues even after you leave, a Solo 401(k) requires an active business. No business = no plan.
Example:
Maria ran a consulting firm as a sole proprietor. When she retired and closed her business, she was required to close her Solo 401(k) and move her funds to an IRA.
Hiring Employees
A Solo 401(k) is for owner-only businesses. Once you hire full-time W-2 employees (other than your spouse), you may no longer qualify if.
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Full-time employee rule: 1,000+ hours in a 12-month period.
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Part-time rule (SECURE Act 2.0): 500–999 hours for two consecutive years.
Example:
David owned a small graphic design firm. When he hired a full-time assistant who worked over 1,000 hours in the year, his business no longer qualified for a Solo 401(k). He had to transition to a traditional employer 401(k).
Choosing to Terminate the Plan
Some business owners voluntarily close their plan, even if still eligible. But be aware of the “successor plan rule” (also called the cooling-off period):
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If you terminate your Solo 401(k) without a qualifying reason, you must wait 12 months before opening a new plan.
2. What to Consider Before Closing
When closing a Solo 401(k), think carefully about these factors:
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Pre-tax vs. Roth balances: Funds must be separated. Pre-tax money goes to a traditional IRA; Roth money goes to a Roth IRA. If both spouses participated, each must open separate accounts.
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Outstanding loans: Any unpaid Solo 401(k) loan must be paid off. If not, the balance is treated as a taxable distribution.
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Alternative investments: Real estate, private equity, or cryptocurrency held in the Solo 401(k) can often be transferred in kind to a self-directed IRA, rather than liquidated.
3. IRS Reporting Requirements
Closing a Solo 401(k) triggers specific reporting to the IRS:
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Form 1099-R – Reports how the funds left the Solo 401(k) (rollover, distribution, etc.).
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Form 5500-EZ – Must be filed as a final return when terminating the plan, regardless of account size.
⚠️ Common Misconception: Some believe if their Solo 401(k) has less than $250,000, no filing is needed. This is incorrect. While active plans under $250k may not file annually, all terminating plans must file a final Form 5500-EZ.
Example:
Tom had $150,000 in his Solo 401(k). When he closed it in 2025, he was required to file a final Form 5500-EZ by July 31, 2026 — even though his balance was below $250,000.
4. Timing Matters
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If you hire employees, track their hours carefully. Once they meet eligibility thresholds, you must close the plan.
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If you have outstanding loans, settle them before year-end to avoid unexpected taxes.
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When liquidating or transferring investments, give yourself enough time to coordinate with custodians and meet reporting deadlines.
5. Steps to Close a Solo 401(k)
Here’s a step-by-step summary:
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Confirm eligibility to terminate (ceased business, hired employees, or retirement).
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Pay off any participant loans.
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Open new accounts (traditional/Roth IRAs or self-directed IRA).
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Transfer funds and assets (rollover or in-kind transfer).
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File IRS forms – 1099-R and final 5500-EZ.
Final Thoughts
Closing a Solo 401(k) is more than just withdrawing funds. It requires careful planning, proper rollovers, and IRS reporting to avoid penalties.
If you’re unsure about timing or reporting, consult a tax advisor or plan administrator to guide you through the process. Done correctly, closing your Solo 401(k) can be smooth and penalty-free — ensuring your retirement savings remain protected.
