Participation Fell From 66% to 35%. Then the Self-Funded Plan Died.

How Low Participation Kills a Self-Funded Health Plan

Your health plan doesn't blow up in one bad year. It bleeds out over five.

Shifting cost increases onto employees feels like discipline. Sometimes it's the first cut in a slow death spiral. Here's how that happens, and how your contribution strategy impacts it.

A Self-Funded Death Spiral, Year by Year

I watched this play out with a client. The details stay anonymous. The numbers are real.

Strong company, growing fast, not yet profitable. In 2017 they elected to self-fund, and it worked. Claims ran below expected and participation sat at a healthy 66% of the eligible population.

Then costs crept up. Not a spike, just trend. Eeach year they passed the bulk of the increase straight to employees. They had room to do it...at least on paper.

But affordable on a compliance test and affordable to a 26-35 year-old, are two different things. Each increase pushed another slice of healthy, low-claims workers to waive coverage. The exact people whose premiums subsidize everyone else.

By 2024, participation had fallen from 66% to 35%. The pool left behind was older, sicker, and far more expensive per head. By 2026 the group shut the plan down. While costs in 2025 were slightly below benchmark, expected increases of 40% in 2026, made continuation insurmountable.

Adverse selection never knocked. It moved in one waiver at a time.

Why Your Participation Rate Is So Relevant

Group coverage works because risk spreads across a lot of people. Healthy and sick. Young and old. When enough healthy people opt out, the math stops working.

Stop-loss carriers know this. Most require a minimum participation level, often around 75% of eligible employees, with valid waivers like a spouse's plan or Medicare carved out of the count. Fall below it and you're not just running an expensive plan. You may be in breach of your stop-loss terms, right when you need that coverage most.

Minimum participation exists to block adverse selection, where only the people expecting high costs bother to sign up.

Shifting Costs to Employees Feels Free. It Isn't.

Passing on increases looks like the controlled move. Your employer contribution stays flat and the budget looks tidy. For a year or two, it is.

Every dollar you move onto employees nudges your healthiest members toward the exit. They have options. A spouse's plan, the marketplace, going without. The sick members can't leave. They can't afford to.

The average worker already pays about $6,850 a year toward family coverage in 2025, roughly a quarter of the premium. At mid-market firms, 10 to 199 workers, it runs higher, closer to $8,889. Keep stacking increases on top of that and the real question isn't "can we pass this along." It's "who leaves when we do."

The Fix Sounds Backwards: Spend to Keep Participation

A more generous contribution structure sounds like the expensive option. Over three to five years, it's often the cheaper one.

My client didn't really have the room to invest in participation back in 2019. They protected the contribution line instead, and eventually, lost the self-funded plan. Would richer contributions have cost more up front? Yes. But perhaps less than the talent and retention loss eventually faced.

That's not to say they don't offer coverage today, they do, and they are still a client. They discovered the ICHRA off-ramp. We'll talk more about that soon.

If you can fund coverage well enough that healthy employees stay, and participation holds, you'll have a balanced pool, translating to lower average claims per member, steadier trend, and a stop-loss policy and premium that actually work. You may contribute more today per person, but over time, you'll have a much healthier population than otherwise.

With family premiums now near $27,000 a year, the pressure to shift cost isn't going away.

So model it before your next renewal. Try pulling three years of participation by age band. If your healthy members are trickling out, your contribution strategy isn't saving money. It's just moving the cost somewhere your spreadsheet can't see it... yet.