Self-funding your health plan puts you in control of your claims dollars. It also puts you on the hook for every claim your employees run up, including the catastrophic ones. Catastrophic claims, a premature infant, a cancer diagnosis, a complex surgery, can reach hundreds of thousands to well over a million dollars. Without the right protection in place, one bad year can wipe out everything you saved by leaving the fully insured market.
That’s what stop-loss coverage comes down to: a financial safety net that caps your exposure and makes self-funding viable, especially for mid-sized companies. This guide to stop loss insurance basics explains why stop-loss coverage is essential for self-funded employers and where the structure commonly breaks down. At BeneSmart, stop loss is one of the first things we evaluate when an employer considers a move to self-funding, because the plan design only works if the stop loss structure actually protects you. Getting it wrong isn’t just a financial inconvenience. It’s a threat to the business.
The sections below break down what stop loss insurance is, how the two main coverage types work, what drives the price, and where employers get burned by policies that look fine on paper but fail when a real claim arrives.
Stop Loss Insurance Basics: What It Is and How It Works
Stop loss insurance is a reimbursement policy, not a primary health insurance product. The employer pays every claim out of pocket first, including the catastrophic ones. The stop loss carrier reimburses the employer after the fact, once claims exceed a predetermined threshold called the attachment point. That sequence matters because employers need adequate cash reserves or a financing line to cover claims in real time, before reimbursement arrives. Many employers only recognize this cash-flow timing issue after several months into a self-funded plan, by which point the exposure is already real.
The policy covers the employer, not the employees. Employees still receive their benefits through the health plan. The stop loss contract sits above that, protecting the business when claims spike. In a fully insured plan, the carrier absorbs claim risk directly. In a self-funded structure, you are the insurer. Stop loss is the backstop that keeps that risk from becoming an existential threat to the business.
The Two Types of Coverage Every Self-Funded Plan Needs
Specific Stop Loss: Protection Against One Catastrophic Claim
Specific stop loss, sometimes called individual stop loss, applies at the employee level. Each covered member has a specific deductible, commonly in the range of $30,000 to $100,000 for many mid-sized groups, though deductibles above that threshold exist and are not unusual depending on group size and risk tolerance. Once one person’s claims exceed that threshold in a plan year, the carrier covers everything above it. If an employee is diagnosed with leukemia and racks up $300,000 in claims against a $50,000 specific deductible, the employer’s exposure on that one person is capped at $50,000.
Specific stop-loss is often the primary concern for self-funded employers because high-severity individual claims can directly threaten plan solvency. With specialty drug costs for single members now routinely pushing past $100,000 in a plan year, the specific deductible level you choose has a direct and immediate impact on how exposed the business is. The carrier reimburses these claims as they are incurred, not after the contract year closes, which helps with cash flow management on large individual claims.
Aggregate Stop Loss: When the Whole Group Runs Hot
Aggregate stop loss works differently. Instead of tracking individual claims, it sets a ceiling on the employer’s total annual claims liability across the entire employee population. Carriers typically set the aggregate attachment point at 125% of expected annual claims, meaning you absorb a normal range of variability before the coverage kicks in. If your group was expected to generate $1 million in claims and actual costs hit $1.4 million, the carrier reimburses the $150,000 above the $1.25 million threshold. For a technical example of how carriers define aggregate and specific thresholds, see the Indigo Stop Loss Aggregate and Specific guidance.
Aggregate reimbursement is usually paid after the contract year ends, not in real time, which creates a separate cash flow consideration employers need to plan for. Most employers never trigger aggregate reimbursement in a given year. The attachment point is intentionally set high enough that it only activates during genuinely bad years, with unusual frequency of claims across the group. Think of it as a last line of defense rather than a routine financial mechanism.
How Attachment Points Shape Your Real Financial Exposure
The attachment point is the single biggest lever in a stop loss contract. A lower specific deductible means more protection but a higher premium. A higher deductible means lower premiums but more out-of-pocket risk before the carrier steps in. Employers with strong cash reserves and stable claims history can often absorb a higher specific deductible and come out ahead financially. Smaller or younger groups with less predictable claims should typically set lower deductibles, even if the premium cost is higher, to protect against outlier years.
Setting the attachment point too high is one of the most common mistakes self-funded employers make. It looks like a cost-saving move on day one, but it becomes a serious financial problem the first time a $200,000 claim comes through and your specific deductible is $175,000. The right attachment point is not purely a math problem. It depends on your workforce demographics, your plan’s historical utilization, your cash position, and how much volatility your business can absorb in a rough claims year.
On the premium side, stop loss costs for mid-sized employers typically range from $50 to $150 per employee per month for specific coverage, with aggregate coverage adding roughly $5 to $15 per employee per month on top. Based on carrier renewal data and industry reporting, premiums rose substantially in 2024 and have continued upward since, driven by specialty drug inflation and higher utilization of expensive therapies. That trend makes structuring the attachment point correctly even more critical, because the wrong structure at the wrong premium is the worst of both worlds.
Exclusions and Carve-Outs That Leave Employers Exposed
Laser Provisions: When Carriers Single Out High-Risk Members
A laser provision allows the stop loss carrier to either exclude a specific high-risk individual from coverage or assign that person a much higher specific deductible than the rest of the group. If an employee has hemophilia or an active cancer diagnosis, the carrier may laser that person, meaning the employer absorbs a far larger share of their costs. Lasers can apply for the first contract year only or indefinitely, and they are frequently added or increased at navigations and renewals without much fanfare.
Employers can sometimes negotiate “no new lasers” provisions, though they typically come at a premium and may only hold for one renewal cycle. The risk compounds at renewal: the carrier reviews the prior year’s claims, identifies any member approaching the specific deductible, and may laser that person before they trigger reimbursement in the next year. Understanding that dynamic going in helps employers negotiate contract language that provides at least some runway before lasers can be applied.
Other Exclusions That Create Gaps Between Your Plan and Your Policy
Stop loss contracts frequently exclude classes of people that the health plan itself covers, such as COBRA enrollees, retirees, domestic partners, or employees on disability leave. They may also exclude treatments the health plan covers, particularly experimental therapies, if the stop loss carrier interprets “experimental” differently than the plan document does. These definitional mismatches are where the real gaps form. Employers don’t discover them until a large claim is denied at the stop loss level, leaving the business holding the full cost with no recourse.
The fix is straightforward in principle but requires discipline in execution: the stop loss contract and the plan document need to be reviewed side by side before anything is signed. Every definition that appears in both documents should match. Eligibility classes should align. Any treatment the plan covers should either be covered by the stop loss policy or explicitly acknowledged as an employer-retained risk. That review rarely happens when stop loss is treated as a commodity purchase at renewal.
What Carriers Look at When They Price Your Policy
Stop loss underwriters base their pricing on two to three years of claims and enrollment history. They calculate average monthly costs per employee, then apply a margin for variability, typically 110% to 150% of historical costs, to set the aggregate attachment point. Plan design matters too: richer benefits mean higher expected costs and higher premiums. Demographics, specifically the age and gender distribution of your workforce, geographic location, and industry, all factor into the underwriter’s pricing model. A manufacturer in Ohio with a predominantly male, middle-aged workforce will price differently than a professional services firm with the same headcount.
Employers moving to self-funding for the first time often have no usable stop loss claims history. In that case, carriers fall back on manual rates built from census data, zip code healthcare cost tables, and industry risk benchmarks. The underwriter assigns a rate-to-manual multiplier based on their judgment of the group’s overall risk profile. Manual rates tend to be more conservative, which means first-year premiums are often higher than they will be once actual claims data establishes a track record. Knowing this going in helps employers set realistic budget expectations for year one and avoid the mistake of comparing a manual-rated quote to what a seasoned self-funded employer pays.
Claims timing also matters for pricing. Stop loss contracts are written on either an incurred basis, claims must be both incurred and paid within the same policy year, or a paid basis, where claims paid during the year are covered regardless of when they were incurred. The paid basis offers broader protection and is typically the better option at renewal, but it usually costs more. First-year policies are commonly written on an incurred basis, which creates a potential gap for claims incurred late in the year but not processed until the following year. Employers should understand which basis their contract uses before they sign, as the choice affects both cash flow and the extent of the coverage provided by the stop-loss deductible structure.
Why Structure Matters More Than Finding the Lowest Premium
Most employers buy stop loss at renewal by accepting whatever their TPA or broker presents. Few take the time to negotiate attachment points, push back on laser provisions, or verify that the stop loss contract aligns with the plan document. The result is a policy that checks a box on paper but doesn’t actually protect the business when a large catastrophic claim arrives. The cheapest stop loss policy and the right stop loss policy are rarely the same thing.
Beyond contract structure, state regulations add another layer of complexity. States like California, New York, Maryland, Washington, and others have minimum attachment point requirements that vary by group size. Some states, like New York, severely restrict stop loss availability for smaller employers. If your workforce spans multiple states, as many transportation and logistics employers do, the regulatory picture gets complicated fast. Getting this wrong doesn’t just mean leaving money on the table. It means operating with coverage that may not be enforceable in certain jurisdictions. For an accessible overview of common stop-loss contract provisions, consider this primer on stop-loss contracts.
This is exactly where working with a benefits consulting firm makes a measurable difference. At BeneSmart, we evaluate stop loss coverage as part of the full self-funded plan design, not as an afterthought or a last-minute renewal item. That means analyzing attachment points against actual workforce data, reviewing carrier terms for exclusions that conflict with the plan document, negotiating contract language that closes gaps before they become problems, and making sure the incurred versus paid basis matches your operational reality. The stop loss structure either makes self-funding work or it doesn’t. Getting it right from the start is what separates employers who benefit from self-funding from those who get burned by it.
The Bottom Line on Stop Loss Insurance Basics
Self-funding gives you financial control, but that control only works if your downside is capped. Without specific and aggregate coverage structured around your actual workforce and claims exposure, you are running an uncapped financial risk inside your business every single plan year. The employers who thrive in a self-funded structure treat stop loss as a core part of the plan design, not a commodity they shop on price alone. For a concise overview of understanding stop-loss insurance for self-funded plans, practical resources are available that walk through the basics and common pitfalls.
The employers who get this right know their attachment points, understand what the carrier will and won’t cover, and have a benefits partner who checks the contract language before anything is signed. They revisit the structure every year as claims history evolves and the carrier environment changes. That discipline is what makes the difference between a self-funded plan that performs and one that surprises you with a six-figure bill you didn’t see coming.
If you’re evaluating self-funding for the first time, or questioning whether your current stop loss structure actually protects you, start with a hard look at your attachment points and your plan document alignment. That review will tell you more about your real financial exposure than any renewal quote ever will. Understanding the stop loss insurance basics is where that process begins, and if you want help running that analysis, BeneSmart does this work for employers every day. Reach out and we’ll show you exactly where you stand.
Frequently Asked Questions About Stop Loss Insurance Basics
What is the difference between specific and aggregate stop loss?
Specific stop loss protects against a single member’s catastrophic claims exceeding a set threshold. Aggregate stop loss protects against the entire group’s total claims exceeding a ceiling, typically 125% of expected costs. Most self-funded plans carry both types of coverage.
What is an attachment point in a stop loss policy?
The attachment point is the dollar threshold your plan must exceed before the stop loss carrier begins reimbursing claims. For specific coverage, it applies per individual. For aggregate coverage, it applies to total plan claims for the year. Setting it correctly is the most important structural decision in a self-funded plan.
What is a laser provision in stop loss insurance?
A laser provision lets the carrier assign a higher specific deductible, or exclude coverage entirely, for a high-risk individual member. Lasers are often added or increased at renewal. Employers can sometimes negotiate “no new laser” protections, though they typically come at an added premium cost.
How does the incurred vs. paid basis affect stop loss coverage?
An incurred basis policy only covers claims that are both incurred and paid within the same policy year. A paid basis policy covers claims paid during the year regardless of when they were incurred. The paid basis offers broader protection but typically costs more. First-year plans are often written on an incurred basis, which can leave gaps for late-year claims.
How much does stop loss insurance cost?
For mid-sized employers, specific stop loss coverage typically runs $50 to $150 per employee per month. Aggregate coverage adds roughly $5 to $15 per employee per month on top of that. Actual costs vary based on group size, claims history, demographics, benefit design, and the attachment point selected.