A hospital stay in December. The bill lands in February. The old stop-loss carrier says “no” because the policy ended at midnight on December 31. The employer writes a check for $47,000 from the operating budget, and the new plan’s insurance doesn’t touch it.
This is terminal liability, and it’s the claim run-out that most level-funded marketing materials skip. A fixed monthly payment and a clear stop-loss attachment point can make the plan feel like a clean break on renewal day. In practice, the obligation for claims incurred during the year follows the employer past the contract’s expiration. Claims trickle in for months after the date everyone thought was the finish line.
Why the stop-loss disappears right when you need it
Level-funded plans combine a self-insured claims fund with stop-loss insurance. The stop-loss policy covers large individual claims and aggregate spikes. On a 12/12 contract, a claim must be both incurred and paid within the 12-month policy period to qualify. Carriers also write 12/15 contracts, which extend the paid window by three months, and longer run-out periods such as 12/18 and 12/24. The 12/12 basis is a common default, and run-out is something the employer must elect rather than assume.
When an employer switches carriers at renewal, the stop-loss terminates at the end of the contract. Any claim with a date of service inside that period but a payment date after expiration falls into a gap the industry calls terminal liability. The employer carries it alone. The new stop-loss only picks up claims incurred on or after the new effective date, so there’s no overlap and no safety net.
The timing is what hides the exposure. A December 20 inpatient admission often won’t produce a final bill until mid-February. A specialty pharmacy fill in late December can be rebilled by the PBM months later after a price adjustment. Routine lab work can lag 45-60 days from collection to claim submission. Each one belongs to the plan year that just ended. None of it is covered by the new carrier.
Stop-loss underwriters know the pattern. For groups with 50-250 employees, a meaningful share of the prior year’s total claims can arrive after year-end, and the share runs higher when a member had a high-cost episode in the fourth quarter. Late-arriving claims are how claim lag works in every self-insured arrangement; in level-funded plans the employer absorbs them directly because there is no pooling for the tail.
The cost lands where nobody looked
An employer who spent $800,000 on claims in the plan year can expect a meaningful share of that total to arrive in bills after the plan year closes. If the stop-loss didn’t include a paid run-out extension, the employer writes every one of those checks directly. The money isn’t budgeted, and the finance team has already closed the books on the old plan.
Why the broker conversation rarely covers it
Level-funded sales pitches lean on transparency: a fixed monthly cost, visible claim activity, and clear stop-loss terms. The run-out problem is invisible because it materializes after the transaction feels complete. The summary of benefits rarely mentions terminal liability. The employer agreement with the TPA will include a clause that the employer is responsible for all claims incurred during the plan year regardless of when they’re paid, but that language usually sits deep in a contract that nobody reads past the signature page.
Brokers who haven’t unwound a level-funded group may not grasp the dollar risk. They quote the premium and the specific stop-loss deductible, and the employer asks, “What do I owe next January?” The answer is “You’re covered through December 31.” The employer doesn’t ask what happens to December claims that arrive in March because nobody tells them it’s a question worth asking.
Who gets hit hardest
Two types of employers feel the worst pain. The first is the company with a single late-year catastrophic claim: a NICU stay, a cancer diagnosis, or a major surgery. The incurred date falls in November or December, charges pile up over weeks, and the claim isn’t finalized until after the year turns. It would have pierced the stop-loss attachment point by tens of thousands of dollars, but the policy is gone. The employer covers the difference beyond whatever remains in the old claims fund. That fund gets reconciled against the run-out before anything comes back to the employer, and level-funding contracts differ on the result: some return unused surplus, others forfeit it or withhold a terminal liability reserve when the plan terminates.
The second is the high-turnover employer with a large number of smaller claims in the pipeline: a warehouse, a restaurant group, a staffing firm. A hundred employees generating $500 to $2,000 each, spread across a busy fourth quarter, can add up to an unplanned cost that approaches the old plan’s aggregate attachment point. Without an active stop-loss policy, those expenses land entirely on the employer’s checkbook.
When the company is sold or shut down
Terminal liability also applies when a plan terminates outright, whether through an acquisition, a merger, a shutdown, or a move from level-funded back to fully insured. In those cases there may be no operating budget left to write the check, and the entity that signed the plan may no longer exist in the same form.
For a company being acquired, the run-out belongs on the pre-close checklist. The purchase agreement should say who assumes liability for claims incurred before the sale date but paid afterward, and who keeps the claims fund. A buyer that assumes the plan also takes on its tail. A seller that dissolves leaves employees and providers chasing a plan sponsor that is winding down.
The same question runs in the other direction. A broker setting up a level-funded plan should ask what happens to the tail if the business is sold or closed during the year. A terminal liability endorsement or a segregated run-out reserve is the practical answer, and it costs less than the surprise.
Three ways to neutralize the risk
- Buy a terminal liability endorsement. Some stop-loss carriers offer a rider that covers claims incurred during the policy year but paid within a run-out period after termination, commonly three to six months and sometimes up to twelve. The premium is modest relative to the exposure. Employers should require the broker to include this rider in every proposal quote, not treat it as an afterthought. A carrier’s refusal to offer it tells you what their own data says about the tail.
- Get a post-termination IBNR report. The third-party administrator knows the claims lag patterns. A good TPA can produce a final run-out statement 90 to 120 days after termination that reconciles every paid claim against the incurred period. Hold a portion of the claims fund, or segregate cash, until that reconciliation is complete and audited.
- Set up a switchover reserve. Calculate an estimated run-out by applying the group’s historical lag percentage to recent incurred claims, then set that amount aside in a designated account. It is a cash management habit, not an insurance product, and it converts a surprise into a planned expense. The finance team knows the money is there when the bills show up.
One question to ask before signing
If you terminate this plan on your renewal date, for how many months after that are you still liable for claims, and what does the stop-loss cover during that period? If the broker can’t give you a specific answer backed by contract language, you don’t yet know the cost of the plan.
Level-funded arrangements can work well. A renewal switch without a paid run-out provision is an unfunded liability wearing a fixed-premium label. The difference between a clean transition and a six-figure surprise is often a rider with a modest premium that sits unread on page four of the stop-loss policy. The question costs nothing.
This article is for general information only and is not legal, tax, or medical advice. Employers should consult their own advisors.