The IRS caps SEP IRA contributions for 2025 at the lesser of 25 percent of compensation or $70,000. The $70,000 number gets quoted in most retirement-planning articles. Those articles rarely pause to point out that the same owner who funds a SEP IRA hits a different employee definition on the health benefits side. The tax code treats the same owner under two different definitions.
The contribution arithmetic
The 25 percent rate applies to net earnings from self-employment, not gross revenue. The calculation subtracts half of self-employment tax first, then subtracts the contribution itself. On $100,000 of net earnings from self-employment, the SEP IRA contribution comes to about $18,590. The IRS compensation cap for 2025 is $350,000.
A solo 401(k) allows a larger total contribution because it adds a $23,500 employee deferral before the employer contribution. At higher incomes, that deferral lets the owner reach the $70,000 limit with less net profit than a SEP IRA requires. SEP IRAs remain common because they demand less administration.
The employee definition split
Section 125 cafeteria plans require participants to be employees. A sole proprietor is not an employee. A partner is not an employee. A more-than-2% S corporation shareholder is not an employee for cafeteria plan purposes, even when they work in the business.
Retirement-planning content rarely makes this connection. The same owner who makes a pre-tax SEP IRA contribution can't pay health premiums through a §125 salary reduction. The retirement rules come from §408(k). The cafeteria plan rules come from §125. Different sections set different definitions.
What the split costs
Take a $10,000 annual premium. A W-2 employee inside a §125 plan pays it with pre-tax salary and avoids FICA on that amount. A self-employed owner pays the premium from after-tax dollars, then claims the self-employed health insurance deduction on the federal income tax return. The deduction under §162(l) reduces income tax and lowers adjusted gross income. It doesn't reduce self-employment tax.
On $10,000 of net earnings from self-employment, the self-employment tax cost is $1,413 before any income tax effect. The owner pays that amount because health premiums sit outside the §125 election. A W-2 employee avoids FICA on that same $10,000 premium.
For S corporation owners, the mechanics differ but the boundary holds. A more-than-2% shareholder can have the S corporation pay health premiums and include the amount in wages. The shareholder then claims the §162(l) deduction on the personal return. The premium still counts as wages for FICA. The owner can't run the premium through the cafeteria plan.
Why the definitions differ
Retirement plan rules recognize a self-employed person's dual role as owner and worker. Cafeteria plan rules use a narrower employee definition because §125 governs employer-sponsored benefit elections among employees. The definitions differ by design.
An owner can sit on both sides of a retirement plan contribution. That same owner can't sit on both sides of a cafeteria plan election. The practical result is two separate tax compartments: one for retirement savings, one for health benefits. For owners, those compartments stay separate. The statute sets that boundary.
How this shapes integrated benefit design
WellthCare™ is a Health-to-Wealth™ Benefit System built for W-2 employees inside an employer-sponsored §125 plan. The same employee definition that excludes owners from cafeteria plans sets the participation boundary. Sole proprietors, partners, and more-than-2% S corporation owners can sponsor WellthCare for their W-2 team. They can't participate themselves. Their family members are eligible only if they are eligible W-2 employees. The employee definition sets this boundary, and product design cannot move it.
For owners, the retirement side remains strong. A SEP IRA or solo 401(k) handles the savings need. The health side remains separate: a §162(l) deduction, an HSA if the owner is in an HSA-eligible plan, and after-tax dollars for premiums.
For W-2 employees, the system connects health actions to WellthCare Store™ reward dollars. Employers commit savings to employees' retirement accounts automatically. Employees get $0-co-pay care used before the primary plan, earn Store dollars from verified preventive actions, and build retirement savings automatically.
Planning for mixed groups
Owner stack and employee stack
Brokers and employers with mixed groups need two benefit stacks.
- Owner stack: SEP IRA limits, the self-employed health insurance deduction, and possibly an HSA.
- Employee stack: the employer's §125 plan, group health coverage, and, where adopted, a WellthCare Plan.
One enrollment message for both groups fails because the tax-code definitions differ. The owner doesn't get the §125 election. The W-2 employee does.
See what a WellthCare Plan would look like for your W-2 team.
Healthcare that pays you back.
This article is for general information only and is not legal, tax, or medical advice. Employers should consult their own advisors.