The same W-2 status that makes a spouse eligible for solo 401(k) contributions is also the status that lets a spouse participate in a Section 125 cafeteria plan, if the business has one. Retirement advisors and benefits advisors rarely review this decision together.
A sole proprietor cannot take W-2 wages from the business. A spouse can. That difference determines who can join the Section 125 plan and who qualifies for WellthCare™. The owner stays outside. The W-2 spouse can participate.
The W-2 Rule Hiding Inside the Retirement Plan
IRS rules allow both owners and spouses to contribute to a solo 401(k) only when each has earned compensation from the business. For a spouse, earned compensation means wages for work performed. The business must report the wages on Form W-2. A spouse who helps informally but never receives W-2 pay cannot defer into the plan. A spouse named only as a beneficiary cannot defer either.
The plan document must list the spouse as an eligible employee. Contributions follow the spouse's W-2 wages. For 2025, the IRS set the elective deferral limit at $23,500 and the total contribution cap at $70,000. Workers 50 and older can contribute beyond that limit through catch-up provisions.
That W-2 requirement creates a common-law employment relationship. The business withholds payroll taxes, files employment tax returns, and treats the spouse like any other employee. Many advisors describe payroll as the cost of spouse participation. That framing misses the benefit side entirely.
Section 125 Draws the Same Line
A Section 125 cafeteria plan lets employees pay for qualified benefits with pre-tax salary reductions. The owner cannot participate. Federal rules treat a self-employed owner as a self-employed individual, not as a common-law employee. The spouse who receives W-2 wages can participate, as long as the plan document allows it.
The spouse can pay for eligible group health premiums and other qualified benefits through pre-tax salary reduction. The owner cannot. The same employment status that supports retirement contributions also opens the door to the health benefit side.
WellthCare Uses the Same Eligibility Test
WellthCare™, the first Health-to-Wealth™ Benefit System, limits participation to W-2 employees in the employer's Section 125 plan. Business owners are not eligible. Family members of owners can participate only when they are eligible W-2 employees.
The spouse added to a solo 401(k) for retirement contributions can also be the spouse who qualifies for WellthCare. That spouse gets $0-co-pay care used before the primary health plan, earns reward dollars at the WellthCare Store™, and builds retirement wealth automatically through verified preventive health actions. The owner stays outside the plan, but the spouse's coverage can change how the household pays for care.
The ACA Coverage Piece
WellthCare is not standalone health coverage. It works alongside existing ACA-compliant employer-sponsored group health coverage and gets used first. Participants need that underlying coverage through their own employer or a spouse's employer.
A business can sponsor group health coverage for W-2 employees, including the owner's spouse. If the business does not sponsor ACA-compliant coverage, WellthCare offers an optional minimum essential coverage plan for employers that need one. Review that coverage before relying on WellthCare benefits.
What to Review Before Adding a Spouse
A spouse W-2 decision affects both retirement and health benefit eligibility. Work through these steps before amending any plan documents.
- Confirm the work is real. The spouse must perform actual services. W-2 wages must reflect reasonable compensation for the duties and hours.
- Amend both plan documents. The solo 401(k) plan must list the spouse as eligible. The Section 125 plan must also list the spouse as eligible. These are separate documents.
- Set up payroll. The spouse's W-2 wages trigger federal income tax withholding, Social Security and Medicare taxes, and unemployment tax filings. Writing a check from the business account without payroll filing does not create W-2 wages. A payroll provider can handle these filings.
- Confirm the ACA-compliant coverage exists. WellthCare works alongside that coverage, not as a replacement for it.
One W-2 decision touches two benefits conversations. Ask this question when you add a spouse: does this W-2 status also make the spouse eligible for health benefits the household could not access before? The answer may change which plans the business adopts and when.
See what a WellthCare Plan would look like for your business.
This article is for general information only and is not legal, tax, or medical advice. Employers should consult their own advisors.