You’re sitting across from a PEO sales rep, working through a proposal, and they mention “specific stop loss coverage” as part of the benefits package. Sounds reassuring. Sounds like protection. But if you ask them to explain exactly how it works and what it means for the rates on that proposal, the answer you get is usually vague at best.
That’s not an accident. Stop loss structure is one of the most financially significant components of any PEO health plan arrangement, and it’s also one of the least understood by the businesses actually paying for it. Most PEO clients never see the stop loss policy, don’t know the attachment point, and have no idea how that structure influences what they’re quoted year after year.
This article is a focused look at specific stop loss coverage within PEO arrangements. Not a general overview of PEO insurance. Not a surface-level explainer on self-funded plans. The specific layer. The per-individual threshold. The mechanics that sit underneath the rates you’re paying. By the time you finish reading, you’ll understand how the attachment point works, how risk shifts between the PEO and its reinsurer, what lasering means for your employees, and why any of this should matter before you sign or renew a PEO agreement.
How Specific Stop Loss Fits Into the PEO Insurance Stack
Most PEOs don’t operate like a traditional insurance carrier. Instead, they pool all of their client companies’ employees into a single large-group or partially self-funded health plan. Think of it as one enormous risk pool with thousands of covered lives spread across dozens or hundreds of client businesses. Your employees aren’t on their own plan. They’re swimming in the same pool as everyone else.
That pooling arrangement has real advantages. It gives smaller companies access to large-group pricing they couldn’t get on their own. But it also creates a specific risk problem: what happens when one individual in that pool generates catastrophically large claims? Left unmanaged, a single $800,000 cancer treatment or premature birth could destabilize the entire pool’s financials.
That’s where specific stop loss comes in. It’s the reinsurance layer that caps the plan’s exposure on any single covered individual per plan year. Once an individual’s claims exceed a defined dollar threshold, the stop loss carrier steps in and reimburses the plan for costs above that line. This is closely related to the broader catastrophic loss protection structure that PEOs use to manage extreme risk events.
It’s worth distinguishing this from aggregate stop loss, which is a separate layer that caps total claims across the entire pool. Aggregate stop loss matters, but it’s the specific layer that’s more directly relevant to how individual client companies get priced. When the PEO is managing per-person risk exposure, the terms of the specific stop loss policy are what drive the math behind your per-employee rates.
Here’s a structural detail that often gets overlooked: in a PEO arrangement, the PEO entity itself is typically the policyholder on the stop loss policy. Not you. Not your company. The PEO buys the coverage, sets the terms, negotiates with the carrier, and manages the relationship. Your company has no direct relationship with the stop loss carrier whatsoever. That’s a fundamentally different dynamic than a company that purchases its own self-funded plan with its own stop loss coverage, where the employer is in the driver’s seat on policy terms and claims visibility.
In a PEO arrangement, you’re trusting the PEO to have structured that reinsurance layer responsibly. And since most PEOs don’t disclose the details, you’re largely taking that on faith.
The Attachment Point: Where Risk Actually Shifts
The attachment point is the core mechanism of specific stop loss coverage. It goes by a few names depending on who you’re talking to: specific deductible, retention level, or individual deductible. They all mean the same thing. It’s the dollar threshold per covered individual per plan year above which the stop loss carrier begins reimbursing claims to the plan.
Below the attachment point, the plan absorbs every dollar. Above it, the stop loss carrier covers the excess. The attachment point is where risk actually transfers from the PEO’s plan to the reinsurer.
PEOs set attachment points based on several factors: the size of their covered population, their historical claims experience, their risk appetite, and what they can negotiate with their stop loss carrier. Attachment points can range meaningfully, from around $100,000 on the lower end for PEOs with large, stable pools, up to $500,000 or more for PEOs that prefer to retain more risk internally. Some very large PEOs with tens of thousands of covered lives have enough spread of risk to carry higher retention levels without meaningful exposure.
Here’s the cost tradeoff that matters for your rates. A lower attachment point means the stop loss carrier takes on risk sooner, which means higher stop loss premiums. Those premiums get baked into the per-employee rates the PEO charges its clients. A higher attachment point means the PEO retains more risk internally before the reinsurer steps in, which reduces stop loss premium costs but increases the PEO’s exposure to large individual claims. Understanding how these layers affect your bill requires looking at the full PEO pricing and cost structure in detail.
Walk through a practical example. Say a PEO has a specific attachment point of $250,000. One covered employee has a serious cardiac event and generates $400,000 in claims over the plan year. The stop loss carrier reimburses the plan $150,000, which is the amount above the attachment point. But the PEO absorbed the first $250,000 entirely within the plan. That retained cost doesn’t disappear. It gets spread across all client companies through their per-employee rates, either immediately or at renewal when the PEO reconciles its claims experience.
Now imagine that same scenario with an attachment point of $150,000. The stop loss carrier covers $250,000 of that $400,000 claim. The PEO’s internal retention is lower. But the stop loss premiums it’s paying to achieve that lower attachment point are higher, and those premiums are also embedded in client rates.
Neither structure is inherently better. They represent different risk-cost tradeoffs. The problem is that most business owners evaluating PEO proposals have no idea which structure they’re buying into, because PEOs rarely disclose attachment point details in their proposals or contracts.
What This Means for the Rates You’re Actually Paying
This is where the structural mechanics connect directly to your budget. The PEO’s choice of attachment point, stop loss carrier, and negotiated reinsurance terms directly influence the health insurance component of your per-employee fee. That component is often the largest single cost in a PEO arrangement, and it’s also the least transparent. For a deeper dive into what drives those fees, a cost structure modeling template can help you map out the components.
Consider two PEOs quoting you similar-looking health benefits packages at similar per-employee rates. On the surface, they look comparable. Underneath, one may carry a lower attachment point with a well-rated stop loss carrier, paying higher reinsurance premiums but creating more rate stability because large individual claims are transferred to the reinsurer quickly. The other may retain more risk internally with a higher attachment point, keeping reinsurance costs lower in the short term but carrying more exposure if the pool has a bad claims year.
That second structure might quote you a slightly lower rate today. But if the pool has several large claims that stay below the attachment point, the PEO absorbs them internally, and that experience flows into renewal pricing. You may see a meaningful rate increase at renewal with no clear explanation of why.
This is the transparency gap that creates real problems for business owners. When a company buys its own self-funded health plan with its own stop loss coverage, the employer sees the stop loss policy terms, knows the attachment point, and receives claims data throughout the year. They can make informed decisions about plan design changes, reserve levels, and renewal negotiations.
PEO clients typically get none of that. You receive a renewal rate and, if you’re lucky, a general explanation tied to “industry trends” or “claims experience in your group.” What you usually don’t get is a breakdown of how the stop loss structure influenced your renewal, whether the attachment point changed, or how your employees’ claims compared to the pool average. Knowing how much a PEO actually costs requires looking beyond the headline number.
Some PEOs are more transparent than others. A few will share aggregate claims data or provide more detail on their reinsurance structure when asked directly. But asking matters. If a PEO won’t answer basic questions about their stop loss arrangement, that’s useful information in itself.
Lasering, Exclusions, and the Fine Print That Bites
Even if a PEO has a well-structured stop loss arrangement, the policy itself may contain provisions that create gaps in coverage. Two of the most consequential are lasering and exclusions, and neither gets nearly enough attention in PEO sales conversations.
Lasering is a practice where the stop loss carrier identifies specific high-risk individuals within the covered population and either excludes them from coverage entirely or assigns them a significantly higher individual attachment point. It’s standard industry practice in the stop loss market, and it’s how carriers protect themselves from known catastrophic risk. If someone in the PEO’s pool has a documented high-cost condition, like end-stage renal disease, an active cancer diagnosis, or a chronic condition with predictable high annual spend, the stop loss carrier may single that person out.
When a laser is applied, the PEO absorbs more risk on that individual than the standard attachment point would suggest. If the standard attachment is $250,000 but a specific individual has a laser of $600,000, the PEO retains the first $600,000 of that person’s claims before the stop loss carrier contributes anything. That retained exposure gets distributed across the pool. Understanding how these dynamics affect the overall pool is central to improving your PEO loss ratio.
Here’s what makes this particularly relevant for business owners: those lasered individuals might be your employees. And you almost certainly won’t know. The PEO has no obligation to disclose which individuals in the pool are lasered, and in many cases, HIPAA considerations make individual-level disclosure complicated anyway. But the financial impact of those lasers still flows into the rates your company pays.
Beyond lasering, specific stop loss policies commonly contain exclusions that can leave real gaps. Pre-existing condition limitations in the first policy year are one example. Certain transplant procedures or experimental treatments may have separate caps or exclusions. Some policies carve out specific high-cost drug categories. These exclusions mean that certain claims, even if they exceed the attachment point, may not be fully covered by the stop loss carrier, leaving the PEO’s plan to absorb costs it might not have anticipated.
Renewal is where all of this converges. If the PEO’s pool had a difficult claims year, the stop loss carrier has several tools at renewal: raise premiums, increase the attachment point, add new lasers on individuals who generated large claims, or in some cases, non-renew the policy entirely. Any of these outcomes flows downstream into the rates client companies are quoted for the following year. A PEO that had a clean claims year may offer stable renewals. One that absorbed several large claims near or above the attachment point may face a harder market from its stop loss carrier, and those costs land on you.
Questions to Ask Before You Sign a PEO Agreement
Understanding the mechanics is useful. Knowing what to ask is actionable. Before you commit to a PEO arrangement or renew an existing one, these are the specific questions worth pressing on. If you’re still early in the process, a broader guide on how to evaluate and select a certified PEO can help frame your overall approach.
What is your current specific attachment point? This is the most basic question, and a PEO that won’t answer it is telling you something. You want a dollar figure, not a general description of their reinsurance program.
Has the attachment point changed in the last three years? If the PEO has been moving the attachment point upward, it may indicate that their stop loss carrier is pushing back on terms due to poor claims experience. That’s a signal worth understanding.
Are any of my employees currently lasered or excluded from the stop loss coverage? You may not get a direct answer due to privacy constraints, but asking puts the question on the table. Some PEOs will confirm whether any lasers exist in their current pool without identifying individuals. If they won’t engage with the question at all, that’s worth noting.
What claims data transparency will I receive during the contract term? At minimum, you should understand whether you’ll receive any aggregate claims reporting for your employee group. Some PEOs provide this; many don’t. Knowing where you stand before you sign is better than discovering the gap at renewal.
What is the AM Best rating of your stop loss carrier? Stop loss carriers vary in financial strength. A lower-rated carrier may offer better terms in the short term but represents more counterparty risk. For a coverage layer that only matters when claims are catastrophic, carrier financial strength matters. Comparing providers side by side using a resource like a top PEO providers comparison can surface these differences quickly.
How are IBNR claims handled if we terminate the relationship? Incurred but not reported claims are a real transition risk. If an employee has a major medical event in November and the claim isn’t submitted until February, and your company left the PEO in January, who covers that claim? The run-out provisions in the stop loss policy determine this, and the answer varies by PEO. Understanding this before you’re in a transition is far better than discovering a coverage gap after the fact. If you’re already considering a move, review a detailed PEO exit and cancellation guide to understand the full scope of transition risks.
On the question of when stop loss structure should be a dealbreaker: if your company has known high-cost claimants, a small headcount where one large claim could materially swing your renewal, or you’re in a high-risk industry with elevated health utilization, the stop loss structure deserves serious scrutiny. For a company with 200 employees and a healthy claims history, it’s still an important factor, but it sits alongside other evaluation criteria. For a 15-person company with an employee managing a serious chronic condition, it’s near the top of the list.
Putting It All Together
Specific stop loss coverage structure isn’t a technicality buried in the fine print. It’s a core driver of the health benefit costs embedded in your PEO pricing, and it directly influences how your rates behave at renewal. The attachment point determines where risk transfers. The stop loss carrier’s terms determine how stable that transfer is. Lasering and exclusions determine whether the coverage actually performs when large claims happen. And the transparency around all of it determines whether you can make an informed decision.
Business owners who understand this structure are better positioned to evaluate PEO proposals on substance rather than surface-level rate comparisons. Two proposals at similar per-employee rates can represent very different risk exposures depending on what’s underneath.
If you’re evaluating PEO providers and want to compare them with this structural lens, PEO Metrics gives you a side-by-side view of providers that goes beyond the headline rate. Before you commit to another year, make sure you understand what you’re actually buying. Don’t auto-renew. Make an informed, confident decision.
