A Solo 401(k) is a powerful retirement savings tool for self-employed individuals. But what happens to this plan when your business situation changes—when you retire, shift to W-2 employment, or hire full-time staff? The good news: your hard-earned savings don’t vanish. The not-so-good news: your options become limited. This guide breaks down everything you need to know to avoid costly mistakes.
✅ Can You Keep the Solo 401(k) Open?
The short answer: not indefinitely.
The Solo 401(k) is only available to self-employed individuals or business owners with no full-time employees, other than a spouse. Once you are no longer self-employed or your business hires full-time employees, you are no longer eligible to maintain this type of plan.
This means that simply stopping your self-employment activity or hiring staff can trigger the requirement to shut down or convert your Solo 401(k). Unlike traditional employer-sponsored plans where the employer continues to exist even after you leave, the Solo 401(k) is tied directly to your business. If the business no longer exists, neither can the plan.
You can only maintain a Solo 401(k) if:
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You remain self-employed.
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Your business does not hire full-time W-2 employees (excluding the owner and spouse).
Once you stop self-employment or hire certain employees, the IRS requires that you close the Solo 401(k) or convert it to a different type of plan.
🚫 Events That Trigger Ineligibility
If you permanently cease all self-employment activity, you must close your Solo 401(k) plan. At that point, you can roll over your funds into an IRA—either a traditional IRA, Roth IRA, or both—depending on whether the funds are pre-tax or Roth.
1. You Cease Self-Employment
If you shut down your business or no longer earn self-employment income:
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Your Solo 401(k) must be closed.
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Funds can be transferred to an IRA (Traditional or Roth depending on the tax character of the funds).
✅ You cannot maintain a Solo 401(k) if there’s no business tied to it.
2. You Hire Full-Time W-2 Employees
If you hire a W-2 employee who:
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Works 1,000+ hours in 12 months, and
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Is not an owner or spouse,
your business no longer qualifies for a Solo 401(k). You must: -
Shut down the Solo 401(k), or
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Convert it to a traditional employer 401(k) plan.
3. Long-Term Part-Time Employee Rule (Secure Act 2.0)
Under Secure Act 2.0, if a W-2 employee works between 500 and 999 hours per year for two consecutive years, they must be included in the company’s 401(k) plan. This rule also disqualifies your business from maintaining a Solo 401(k).
If a non-owner W-2 employee works:
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500–999 hours per year for two consecutive years,
you’re also disqualified from maintaining a Solo 401(k).
🔍 Tip: Employees under age 21, union members, and contractors are excluded from these rules.
🔄 What Can You Do With the Funds?
1. Transfer to an IRA
This is the most common and tax-efficient option. You can roll over your Solo 401(k) into a Traditional IRA or Roth IRA. This type of transfer is non-taxable if done directly and properly documented. The IRS requires you to file Form 1099-R and a final Form 5500-EZ to report the termination of the plan.
This is the most common route:
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Funds can be rolled into a Traditional IRA, Roth IRA, or both depending on their source.
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The rollover is non-taxable when done directly.
📄 You’ll need to file:
IRS Form 1099-R
Final IRS Form 5500-EZ
2. Convert to a Traditional Employer 401(k)
If your business continues to operate and you hire full-time employees, you may convert your Solo 401(k) to a full 401(k) plan for employers. Since the plan isn’t being closed but simply updated, there is no need to file Form 1099-R or 5500-EZ.
If your business is expanding and now includes full-time staff:
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You can convert your Solo 401(k) into a traditional 401(k).
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No 1099-R or 5500-EZ required if the plan is restated instead of closed.
3. Take a Distribution
Taking a distribution should be a last resort. Distributions from a pre-tax Solo 401(k) are subject to federal income tax and, if you’re under age 59½, an additional 10% early withdrawal penalty.
Avoid this if possible:
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Pre-tax distributions are fully taxable.
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If under age 59½, a 10% early withdrawal penalty applies.
🛑 The Most Common Mistake
One of the most frequent mistakes is failing to formally close the Solo 401(k) with the IRS. Simply stopping contributions or removing the funds is not enough. You must officially terminate the plan and submit the necessary forms to avoid penalties and tax issues down the line.
Failing to formally close the Solo 401(k) plan.
You must notify the IRS that the plan is terminated by:
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Filing the correct paperwork.
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Avoiding accidental noncompliance that may trigger penalties or tax headaches.
Final Thoughts
Transitioning out of self-employment doesn’t mean your retirement savings are in jeopardy—but it does require action. Whether you plan to retire, start a W-2 job, or expand your business, make sure you handle your Solo 401(k) with care. With proper guidance and timely paperwork, you can preserve your funds and avoid costly mistakes.
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File the necessary IRS forms (Form 1099-R and Form 5500-EZ) to close correctly close the solo 401k.
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Consider rolling over to an IRA or setting up a traditional 401(k).
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Avoid distributions unless necessary.
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Timely each out to your Solo 401(k) provider for help with account closures or conversions.
- See also the following: https://www.mysolo401k.net/when-do-i-need-to-close-my-self-directed-solo-401k-plan/ & https://www.mysolo401k.net/freeze-my-solo-401k-plan/
