Solo 401k for Working Spouses

A solo 401k is for the working business owners and their spouses.  However, if the business that sponsors the solo 41k employs non-owner W-2 employees who meet the following eligibility requirements, neither the owners of the business nor their spouses will be eligible to open or to continue with the solo 401k plan.

If the business employees non-owner W-2 employees who work 1,000 hours or more, the business cannot sponsor a solo 401k plan.  What is more, if the business is currently sponsoring a solo 401k plan and one of the non-owner W-2 employees works 1,000 hours during the year, the solo 401k plan will need to be converted/restated to a full-time employer 401k plan and also offered to the now eligible full-time employee.

Slides: How to Adding /Including Spouse in the Solo 401k Plan

Starting in 2021, once the business sponsoring the solo 401k plan employs a part-time, non-owner W-2 employee (defined as 500 but less than 999 hours)  who works part-time for 3 consecutive years, the solo 401k plan will need to be converted to a full-time employer 401k plan.

S-Corp Both Spouses Contribution QUESTION:

The Mega Roth might work very well for one of my clients. He is Sheriff and has a real estate S-Corp. business on the side with no employees and wants to maximize the ROTH for him and his wife. Would his wife need to be an employee to get the $57K limit for both?

Both he and his wife can participate in the solo 401k they’re both working in the business and receive W-2 wages from the business. Each of them will be able to contribute to the plan based on their respective W-2 wages that they each receive from the business (along with other factors such as their age and whether they make contributions to another 401(k) plan such as through a “day job”).

How to Add My Spouse to the Solo 401k Plan QUESTION:

I have a solo 401k through you. I am curious how to add my spouse to my plan, so I can provide her the ability to contribute to my solo 401k?

First, if she is not yet listed on the solo 401k plan, we first need to list her on the plan documents.  Second, as long as she is also working in the self-employed business that the solo 401k plan was set up for (a.k.a. the plan sponsor), she will also be eligible to make contributions to the solo 401k plan based on earned income she receives from the business. Third, she will need to open a separate participant account (brokerage or bank account) to hold her solo 401k funds under the plan. She may also need multiple holding accounts if she plans to contribute multiple sources of funds (e.g., Roth, pretax and voluntary after-tax) to the solo 401k plan. Please provide her legal name when you are ready to have us add her to the plan.

Domestic Partner Spouse QUESTION:

My 2nd employee (in addition to myself) is my domestic partner (DP; unmarried). Please confirm the spousal exclusions for 401k plan participation also applies to DPs. With the 1000 hr rule I felt I was covered assuming any challenge re DP status. Now that the rule for participation is 500 hours I'm unsure and need clarification. To be clear, she is not currently participating in the 401k?

Yes Domestic Partners are treated as spouses (see Section F(10)(c)(iii)).

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About Mark Nolan

Each day I speak with energetic entrepreneurs looking to take the plunge into a new venture and small business owners eager to take control of their retirement savings. I am passionate about helping others find their financial independence. Having worked for over 20 years with some of the top retirement account custodian and insurance companies I have a deep and extensive knowledge of the complexities of self-directed 401ks and IRAs as well as retirement plan regulations. Learn more about Mark Nolan and My Solo 401k Financial >>

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