When business leaders first hear about self-funded or level-funded health plans, the most common reaction is some version of this: “But what if we get hit with a catastrophic claim?” It’s a reasonable concern. If your company is directly responsible for paying claims, what happens when an employee needs a $500,000 surgery or a year-long cancer treatment?

The answer is stop-loss insurance. It’s the mechanism that puts a ceiling on your exposure and makes alternative plan structures financially viable for companies of all sizes, including yours.

What stop-loss insurance does

Stop-loss insurance is a separate policy that protects your company from unexpectedly high claims. It doesn’t replace your health plan. It sits behind it, acting as a backstop that kicks in when claims exceed a defined threshold.

Think of it this way: with a self-funded or level-funded plan, your company pays claims as they come in. Most months, that works out fine. But stop-loss insurance is there for the months when it doesn’t. It turns an unpredictable risk into a bounded one.

There are two types of stop-loss coverage, and most employers need both.

Specific stop-loss (individual protection)

Specific stop-loss, sometimes called individual stop-loss, protects you against any single person’s claims getting too high.

Here’s how it works. You choose a threshold, called the attachment point or deductible. If any one covered individual’s claims exceed that amount in a plan year, the stop-loss carrier reimburses you for the excess.

Key term — Specific attachment point: The dollar amount at which stop-loss insurance begins paying for an individual’s claims. For example, if your specific attachment point is $75,000 and one employee incurs $200,000 in claims, the stop-loss carrier pays $125,000 of that.

Common specific attachment points for small and mid-sized employers range from $40,000 to $125,000. The level you choose involves a trade-off. A lower attachment point means more protection, but the stop-loss premium will be higher. A higher attachment point lowers your premium but means you absorb more of each large claim before coverage kicks in.

For a company with 25 to 100 employees, specific attachment points in the $50,000 to $80,000 range are common. Your benefits advisor should help you model the right level based on your workforce demographics, claims history, and risk tolerance.

Aggregate stop-loss (total claims protection)

Aggregate stop-loss protects you against your total claims for the entire group running higher than expected. Even if no single individual hits the specific attachment point, it’s possible for many moderate claims to add up to a bad year. Aggregate stop-loss covers that scenario.

The aggregate attachment point is typically set at 120-125% of your expected claims for the year. If your total claims exceed that threshold, the aggregate stop-loss carrier pays the excess.

Key term — Aggregate attachment point: The maximum total claims amount your company is responsible for in a plan year across all covered individuals. Set as a percentage above your expected annual claims. If total claims exceed this amount, the stop-loss carrier reimburses the difference.

Here’s a simplified example. Say your expected annual claims for your group are $400,000. Your aggregate attachment point is set at 125%, or $500,000. If your actual claims come in at $550,000, the aggregate stop-loss carrier pays $50,000.

Together, specific and aggregate stop-loss create a double layer of protection. You’re covered if one person has a catastrophic event, and you’re covered if the whole group has an unusually expensive year.

How stop-loss makes alternative plans safe for small companies

This is the part that changes the conversation for many business leaders. The concern about catastrophic risk is valid, but stop-loss insurance directly addresses it. With the right stop-loss policy in place, your maximum financial exposure is defined and predictable.

Consider the comparison:

  • Fully funded plan: You pay a fixed premium. The carrier takes the risk. But you also give up any potential savings from good claims performance, and you have little visibility into your costs.
  • Self-funded plan with stop-loss: You pay claims as they come in. If claims are low, you keep the savings. If claims are high, stop-loss limits your downside. You have full visibility into your data and the ability to manage your plan proactively.

The net effect is that you’re not taking on unlimited risk. You’re taking on a defined, bounded risk with meaningful upside if your team stays healthy.

For companies in the 25-200 employee range, level-funded plans make this even simpler. A level-funded plan bundles your expected claims, administrative costs, and stop-loss premium into a single monthly payment, similar to what you pay for a fully funded plan. But at the end of the year, if claims come in under the expected amount, you may receive a surplus back. Stop-loss is built right in.

What to look for in a stop-loss policy

Not all stop-loss policies are created equal. Here are the key things to evaluate:

Lasering. This is one of the most important terms to understand. Lasering occurs when the stop-loss carrier identifies a specific individual in your group who they consider high-risk, often someone with a known expensive condition, and sets a higher individual attachment point just for that person.

For example, if your standard specific attachment point is $75,000, the carrier might laser one employee at $250,000 because they’re undergoing ongoing treatment. That means you’re absorbing much more risk for that individual. Always ask whether a policy includes lasering provisions, and if it does, understand who is affected and at what levels.

Known conditions and exclusions. Some stop-loss policies exclude claims related to conditions that were known at the time the policy was written. This can significantly reduce your protection. Look for policies with no new lasers or rate caps on lasered individuals, and understand any exclusion language before you sign.

Contract basis: paid vs. incurred. Stop-loss policies are written on either a paid basis or an incurred basis. A paid contract covers claims paid during the policy period. An incurred contract covers claims incurred during the policy period, regardless of when they’re paid. Incurred contracts offer more complete protection but may have a run-in and run-out period that you need to understand.

When evaluating a stop-loss policy, don’t just look at the premium. Look at the contract terms. A cheaper stop-loss policy with aggressive lasering or broad exclusions can leave you exposed exactly when you need protection most.

Terminal liability. What happens to claims that are incurred during your policy period but not paid until after it ends? Terminal liability provisions address this. Make sure you understand who is responsible for those trailing claims, especially if you’re switching stop-loss carriers or moving back to a fully funded plan.

Carrier financial strength. Your stop-loss carrier needs to be there when you need them. Look for carriers with strong financial ratings from A.M. Best or similar rating agencies. This is insurance backing your insurance. Stability matters.

How stop-loss premiums are set

Stop-loss carriers price their policies based on several factors: the size of your group, the demographics of your workforce, your claims history if available, the attachment points you select, and the plan design. Healthier groups with lower historical claims will generally get better rates.

This is another area where good health navigation and claims management can pay off. If your claims trend is improving because your employees are making better healthcare decisions, that can translate into better stop-loss pricing at renewal. It’s a virtuous cycle: lower claims lead to lower stop-loss costs, which further reduce your total plan expense.

The bottom line

Stop-loss insurance is the mechanism that makes self-funded and level-funded plans work for employers who aren’t giant corporations. It puts a defined ceiling on your financial exposure while preserving your ability to benefit from good claims performance.

When someone tells you that self-funding is too risky for a company your size, the right response is to ask whether they’ve accounted for stop-loss. With the right policy in place, you’re not gambling on your employees’ health. You’re making a calculated decision with built-in protections, and that’s a fundamentally different proposition than going without a safety net.