Your broker hands you the year-end stop-loss report. Paid claims land well below the attachment point. The numbers say you are due a refund. Five months later, bills still trickle in for services employees received in October, November, and December. The surplus shrinks. Then it vanishes.
That's the claims run-out trap baked into many level-funded health plans.
What level funding sells
A level-funded plan blends self-funding with a fixed monthly payment. The employer pays a set amount per employee each month. Part covers expected claims, part buys stop-loss insurance that caps exposure above a threshold. When actual claims come in below the funded amount, the employer gets a refund or credit. When they spike, the stop-loss kicks in. The pitch is budget certainty with an upside. That refund is narrower than the pitch suggests: only the claims-funding portion can come back, the surplus is split with the carrier on terms that vary by contract, and the administrative fees are spent and never return.
Mid-size groups eat it up. They want to dodge fully-insured rate hikes but fear the volatility of pure self-funding. Brokers compare the level-funded number against a BUCA renewal (Blue Cross, UnitedHealthcare, Cigna, Aetna), and the level-funded number usually looks cheaper. What gets far less attention is the liability that trails the plan year like a shadow.
The tail that eats the surplus
Claims run-out is the period after the plan year ends when the employer remains responsible for claims incurred during that year but paid late, a window that often runs three or six months and sometimes longer. It's written into the stop-loss contract. A specialist visit in December that doesn't get billed until February. A November surgery whose final invoice lands in March. A neonatal stay with charges arriving piecemeal for half a year. Each late bill rewrites the math on the surplus that looked solid in January.
This isn't a fringe scenario. In a fully-insured plan, the carrier swallows those late bills; the employer's obligation stops on the last day of coverage. In a level-funded plan, the employer's checkbook stays open long after the plan year closes. The stop-loss report delivered in January only counts paid claims through December 31. It ignores the tail. That tail can erase the entire projected refund and occasionally forces an additional back-end payment above the stop-loss attachment point. The "budget certainty" that level funding markets depends on a clean run-out that rarely shows up on a mid-size group's medical book.
The ugliest version arrives when an employer leaves the level-funded plan (because the rate jumped or service fell apart) and then receives bills for months from a plan they no longer sponsor. No negotiating leverage. No broker actively managing the runoff. There is a way to close that gap: terminal liability coverage, a stop-loss rider that extends the run-out for three or six months after termination. The catch is that it is usually elected at the start of the policy year, before anyone knows they will leave, and it costs extra. The switch that was supposed to cut costs becomes an open-ended liability for employers who never planned for the exit.
Why the late bills pile up
Run-out losses aren't random misfortune. They concentrate on late-stage medical events that could have been caught much earlier. A chronic condition that simmered until it became an emergency room admission in November. A missed screening that would have found a tumor when it was small and treatable, instead of generating six months of post-surgical billing. The claims run-out invoice is the bill a traditional plan sends for a system that rewards inaction and penalizes early intervention. Standard benefit design doesn't change that. It waits for claims to happen, then sorts out who pays.
State regulators are now scrutinizing level-funded plans
Level funding now faces a second kind of pressure. The product has grown fast among small employers, and regulators have started to respond. The Department of Health and Human Services identifies employers with 20 to 100 workers adopting self-funded and level-funded arrangements as the dominant driver of recent small-group enrollment shifts, noting those arrangements sit outside ACA community rating, essential health benefit, and medical loss ratio rules. The National Association of Insurance Commissioners' Coverage (B) Working Group discussed level-funded plans at its 2026 Summer National Meeting. Trade press reported in August 2026 that state insurance regulators plan to write guidelines for the product, after seeing employers run into unexpected cash-flow problems. Employers weighing the refund pitch should assume the rules can change.
Fix the input, not just the stop-loss
You can tinker with attachment points or buy extended run-out coverage, but that just moves money around. The better move is to reduce the claims that show up late in the first place.
WellthCare™ is the first Health-to-Wealth™ Benefit System. It sits alongside an employer's existing health plan and gets used first. Employees get $0-co-pay care, earn reward dollars at the WellthCare Store™ for verified preventive actions, and follow a personalized care plan drafted by AI, reviewed by a nurse practitioner and physician. The downstream effect is direct: fewer undetected conditions turn into urgent, expensive episodes, so fewer large, late-filed claims clutter the run-out tail. The stop-loss report begins to reflect the group's actual health trajectory, not a gamble on billing cycles.
After 6 to 12 months of real usage, the patent-pending WellthCare Readiness Index™ hands employers their own data. It shows how much spending the system kept off the primary plan and the projected savings if the system expands. No industry benchmarks that might not match the group's demographics. No assumptions. The Index turns run-out from an abstract risk into a measured, shrinking number. It's the difference between hoping claims don't arrive late and knowing they were never generated at all.
Level-funded refund ads promise a payoff for a low-claims year. The truth is that the refund hinges less on claims activity during the year than on the randomness of billing cycles afterward. Employers that want the upside of low claims without the tail exposure can put a benefit in front of the primary plan that catches what breaks people later. When you change the input, the run-out shrinks to a rounding error instead of a budget headache.
See what a WellthCare Plan would look like for your team.
This article is for general information only and is not legal, tax, or medical advice. Employers should consult their own advisors.