Most stop-loss explanations stop at the concept. “Specific stop-loss protects against individual claims exceeding a threshold. Aggregate stop-loss protects against total group claims exceeding projections.” That’s technically accurate and practically useless, because what business owners actually want to see is how the numbers play out when a real claim comes in.
This article runs through three detailed scenarios, with specific dollar amounts, to illustrate how stop-loss insurance behaves when claims hit a plan.1 If you haven’t yet, What Is Stop-Loss Insurance is the plain-English overview, and Aggregate vs. Specific Stop-Loss is the mechanics deep-dive. This one is the show-me-the-numbers version.
Setting the scene
For all three scenarios, we use the same illustrative example company:1
- Kingsfoil Landscaping (hypothetical): 50 employees, self-funded health plan
- Expected annual claims: $500,000 ($10,000 per employee per year on average)
- Specific stop-loss attachment point: $75,000 per individual
- Aggregate stop-loss factor: 125% of expected claims
- Aggregate stop-loss attachment point: $625,000 ($500,000 × 1.25)
- Administrative fees and stop-loss premium: $120,000/year combined
Total “baseline” plan cost in an average year: around $620,000 ($500,000 claims + $120,000 admin/stop-loss).
Now let’s run three different plan years and see what happens.
Scenario 1: One catastrophic claim (specific stop-loss triggers)
This is the scenario most employers picture when they worry about self-funding. One employee has a medical catastrophe, and the claims are enormous.
What happens: A 42-year-old employee is diagnosed with pancreatic cancer in February. Treatment includes surgery, chemotherapy, radiation, and inpatient care over the balance of the plan year. Her total plan-paid claims for the year come to $425,000.
The rest of the group has a relatively normal year. The other 49 employees have claims totaling $400,000 (slightly below the expected $490,000 for that subset).
Total claims for the year: $825,000 Expected claims: $500,000 Overage: $325,000
Now the stop-loss math:
Specific stop-loss calculation:
- Individual employee’s total claims: $425,000
- Specific attachment point: $75,000
- Specific stop-loss reimburses: $425,000 − $75,000 = $350,000
Aggregate stop-loss calculation:
- For aggregate purposes, only the portion of each individual’s claims below the specific attachment counts toward the aggregate total. This is an important detail most explanations miss.
- Claims counted toward aggregate: $75,000 (from the large claim, capped at the specific attachment) + $400,000 (all the other claims) = $475,000
- Aggregate attachment point: $625,000
- Since $475,000 < $625,000, aggregate stop-loss doesn’t trigger in this scenario.
Employer’s net cost for the year:
| Item | Amount |
|---|---|
| Claims paid from fund | $825,000 |
| Less: specific stop-loss reimbursement | −$350,000 |
| Net claims cost | $475,000 |
| Plus: admin + stop-loss premium | $120,000 |
| Total employer cost | $595,000 |
Compare this to a baseline year (roughly $620,000). The employer’s total cost is actually lower in this catastrophic year than in a baseline year, because the individual’s excess claims were absorbed by stop-loss and the rest of the group’s experience was slightly better than projected.
Key takeaway: without stop-loss, this scenario would have cost the employer $945,000 ($825,000 in claims + $120,000 admin, if they’d bought no coverage). With stop-loss, the worst-case outcome is bounded.
Scenario 2: A bad aggregate year (no single catastrophe)
This scenario is less dramatic but actually more common, and it’s the one specific stop-loss alone wouldn’t catch.
What happens: No single employee has a huge claim. But across the group, many employees have moderate-to-large claims:
- 3 employees with claims of $60,000–$70,000 (just below specific attachment), total $200,000
- 8 employees with claims of $20,000–$40,000, total $250,000
- 39 employees with more typical claims, total $350,000
Total claims for the year: $800,000 Expected claims: $500,000 Overage: $300,000
Specific stop-loss calculation:
- No individual exceeded the $75,000 attachment point.
- Specific stop-loss reimburses: $0
Aggregate stop-loss calculation:
- Claims counted toward aggregate: $800,000 (none of the individual claims were capped out)
- Aggregate attachment point: $625,000
- Aggregate stop-loss reimburses: $800,000 − $625,000 = $175,000
Employer’s net cost for the year:
| Item | Amount |
|---|---|
| Claims paid from fund | $800,000 |
| Less: aggregate stop-loss reimbursement | −$175,000 |
| Net claims cost | $625,000 |
| Plus: admin + stop-loss premium | $120,000 |
| Total employer cost | $745,000 |
The employer paid $125,000 more than a baseline year (around $620,000), but the total is capped at the aggregate attachment point plus operating costs. Without aggregate stop-loss, the employer would have been out $920,000 — $175,000 more.
Key takeaway: this is the scenario that specific-only coverage would miss. Small and mid-sized employers who drop aggregate stop-loss to save premium are exposing themselves precisely to this failure mode.
Scenario 3: A healthy year (stop-loss doesn’t trigger)
This is what most plan years look like for a healthy group. And it’s the scenario that makes employers occasionally wonder whether stop-loss premium was “worth it.”
What happens: Normal year. Mix of preventive care, a few moderate procedures, two small hospitalizations, typical prescription use.
Total claims for the year: $420,000 (below the $500,000 expected)
Specific stop-loss calculation:
- No individual exceeded the $75,000 attachment.
- Specific stop-loss reimburses: $0
Aggregate stop-loss calculation:
- Total claims were below expected, let alone the 125% threshold.
- Aggregate stop-loss reimburses: $0
Employer’s net cost for the year:
| Item | Amount |
|---|---|
| Claims paid from fund | $420,000 |
| Admin + stop-loss premium | $120,000 |
| Total employer cost | $540,000 |
This is a $80,000 savings versus a baseline year, and in most level-funded plans, some or all of that surplus would be refunded to the employer at year-end reconciliation.
Key takeaway: in a healthy year, stop-loss doesn’t pay out, and that’s exactly what’s supposed to happen. The employer paid for protection they didn’t need, which is the same logic as every other insurance policy. The surplus from favorable experience is the upside of self-funding.
How Claims Data Changes Your Plan Strategy walks through how to read this kind of experience data in real plan reports and what to do with it.
What the three scenarios tell you
Put the three outcomes side by side:
| Scenario | Total claims | Stop-loss reimbursement | Net employer cost |
|---|---|---|---|
| Catastrophic individual | $825,000 | $350,000 (specific) | $595,000 |
| Bad aggregate year | $800,000 | $175,000 (aggregate) | $745,000 |
| Healthy year | $420,000 | $0 | $540,000 |
The range of employer outcomes across realistic scenarios is roughly $540,000 (healthy) to $745,000 (bad aggregate). That’s a $205,000 range. Without stop-loss, the range widens dramatically — a single bad scenario could push total cost above $900,000.
That’s what stop-loss buys you: the top end of your range is capped.
A fully-insured plan would have a narrower range — maybe $620,000 every year, regardless of actual experience — but you’d never see the $540,000 upside in a healthy year. You’d just pay the premium. The self-funded plan with stop-loss gives you both bounded downside and access to the upside.
How the reimbursement process actually works
Mechanically, here’s how stop-loss payouts happen:
For specific reimbursement:
- An individual’s plan-paid claims cross the specific attachment point.
- Your TPA flags the event and compiles documentation (claims summary, eligibility verification, proof of payment).
- Documentation is submitted to the stop-loss carrier.
- The carrier reviews — typically within 15–30 days — and issues reimbursement to the plan.
- Funds flow back into the plan’s claims account.
For aggregate reimbursement:
- At plan year-end, the TPA reconciles total group claims against the aggregate attachment point.
- If claims exceeded the threshold, a reconciliation report is submitted to the stop-loss carrier.
- The carrier reviews and issues reimbursement, typically within 30–60 days of year-end close.
In a well-run plan, the employer doesn’t touch the paperwork. The TPA handles the filings as part of standard administrative services. What the employer does see is the net reimbursement flow back into the plan account and a year-end summary of how stop-loss performed.
What the examples don’t show
Two things worth flagging that the scenarios above simplify:
Lasering. None of the scenarios included a lasered individual. In a real plan with a lasered employee (say, one person carved out at $200,000) the specific reimbursement math would change. For that individual, the employer absorbs $200,000 before stop-loss kicks in, which can shift the net cost substantially in a year when that person has a claim.
Run-in and run-out. The scenarios assume all claims are cleanly within the plan year. In practice, there’s a tail. Claims incurred in December but paid in February can land in a different policy year depending on whether your contract is paid or incurred. Good plan design handles these transitions; poor plan design can create gaps in coverage.
What the numbers show
Stop-loss insurance is most easily understood when you see the numbers. In a catastrophic individual year, specific stop-loss reimburses hundreds of thousands of dollars. In a cumulatively bad year, aggregate steps in where specific can’t. In a healthy year, neither pays out — and that’s exactly the outcome you want.
The protection isn’t theoretical. It’s arithmetic. And for any employer considering a self-funded or level-funded plan, modeling these scenarios with your actual numbers is what turns “this sounds risky” into “this is a calculated decision with a defined worst case.”
Want to see these scenarios run with your actual group’s numbers? We can build a stress-test model with your demographics, expected claims, and proposed stop-loss structure to show you exactly what the range of outcomes looks like. Talk to us.
Footnotes
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All scenarios in this article are illustrative — the company, claims amounts, attachment points, and outcomes are constructed examples for explanation. Actual stop-loss attachment points, premium rates, claims volumes, and reimbursement amounts vary widely by group size, demographics, claims experience, plan design, and which carrier writes the coverage. Modeling against your specific group’s data is the only way to project realistic outcomes. ↩ ↩2