A Benefits Leader’s Guide to Self-Insured Health Plans
Key Takeaways
- A self-insured employer, also called a self-funded employer, pays its employees' medical claims from its own money instead of paying a fixed premium to an insurance carrier.
- Becoming self-insured puts the financial risk of every claim on the employer, along with fiduciary duties under ERISA, the federal law that governs employer health plans.
- For a self-insured employer, running the health plan and controlling its cost become the same job, because the employer pays every claim and owns the data that shows what drives that spending.
When a company becomes self-insured, the benefits team that used to pay a premium bill now owns a cost. The company pays its employees' medical claims out of its own money, and the claims data that used to sit with the carrier now belongs to the company.
Some of the switch is mechanical, like choosing stop-loss coverage and planning for cash flow. But the bigger change is to the benefits team's job. The team now answers for the claims risk and the plan's legal duties under ERISA, and it can see exactly where the money goes. That makes being self-insured as much a strategy decision as a financing one.
How self-insured plans shift risk, data, and rules to the employer
An employer becomes self-insured when it pays its employees' medical claims itself instead of paying an insurance carrier to take on that risk. In a fully insured arrangement, the employer pays the carrier a set premium each month, usually with part of it coming out of employees’ paychecks. The carrier pays whatever claims come in, keeping the difference in a good year and absorbing the loss in a bad one. A self-insured employer pays those claims themselves. Instead of paying a premium, it sets aside money for expected claims and pays each one as it comes in. When the claims run lower than planned, the employer keeps what it didn’t spend. When they run higher, the employer pays the difference.
Most workers with employer coverage are already in plans like this. According to the KFF 2025 Employer Health Benefits Survey, 67% of covered workers are in self-funded plans. At firms with 200 or more employees, that share rises to 80%.
A common misconception is that “self-insured” describes the coverage employees get, when it actually describes who pays their claims. A self-insured employer can keep the exact same provider network it used while fully insured. It can also hire the same carrier to process claims and answer employee questions as a third-party administrator (TPA) working under an administrative services-only (ASO) contract. From the employee's side, things may feel exactly the same. From the employer's side, they now pay money out of their own account.
Self-insuring also changes which rules govern the plan. Self-insured plans are regulated at the federal level under the Employee Retirement Income Security Act (ERISA), rather than by state insurance laws, as healthinsurance.org explains.
Self-insured vs. fully insured: key differences
The biggest differences between the two models come down to who holds the risk, who owns the claims data, and which laws apply.
A fully insured arrangement gives the employer predictability. The health plan price is set for the year, and the carrier builds in its profit margin, administrative costs, and state premium taxes. By contrast, a self-insured employer pays what its employees’ care actually costs, plus administrative fees and stop-loss premiums. In a light claims year, that saves the employer money, while in a heavy one, it costs the employer more.
Why ERISA governs self-insured plans
ERISA sets the federal rules for employer benefit plans and overrides most state laws that deal with them. States still regulate insurance companies, though. So when an employer buys a fully insured policy, the carrier's policy has to follow the state's insurance rules, including any benefits the state requires insurers to cover.
A self-insured employer doesn't buy an insurance policy. It pays claims itself, so there's no insurance company or policy for the state to regulate. Under a part of ERISA known as the deemer clause, a state cannot treat a self-funded employer plan as an insurance company in order to regulate it, as Mercer's primer on ERISA preemption lays out. As a result, state benefit mandates, such as a state requirement to cover bariatric surgery, don’t apply to self-insured plans.
For the employer, this means more flexibility and more responsibility. A self-insured employer decides which benefits its plan covers. If it has workers in several states, it can run one plan under one set of rules everywhere. In exchange, the employer now answers directly to federal law. The Affordable Care Act, COBRA, HIPAA, and the No Surprises Act all still apply in full, and the employer, not the carrier, is the one responsible for following them. For employees, the main difference is that a benefit their state requires insured plans to cover may not be in a self-insured plan unless the employer chooses to add it.
What self-insuring changes for the benefits team
Under a fully insured plan, the benefits team's main financial job is negotiating the renewal. Once the premium is set, the year's cost is known, and the carrier pays the claims and runs the plan. Self-insured status brings that work in-house. The employer takes on new responsibilities, and, in return, it gets data and design choices a fully insured employer doesn’t have.
New responsibilities: claims risk, ERISA fiduciary duty, and plan administration
Three responsibilities that used to sit mostly with the carrier move to the employer, and the first is financial. The employer now pays claims as they come in, so a year with two premature births and a cancer diagnosis costs more than a year without them. To protect against a year like that, most self-insured employers buy stop-loss insurance, which covers the employer rather than the employees. Specific stop-loss policies reimburse the plan once one person’s claims pass a set amount, while aggregate stop-loss covers the plan’s total claims above a set limit for the year. About 87% have at least one stop-loss policy in place, according to Marsh McLennan Agency.
Stop-loss limits the worst case, but the ordinary ups and downs in claims still show up in the employer's own budget. Large claims also raise the stop-loss premium at the next renewal, as the guide on how self-funded employers can manage rising high-cost claims explains.
The second responsibility is legal. Anyone who exercises discretion or control over the plan becomes an ERISA fiduciary, a role whose duties the Department of Labor spells out. A fiduciary must act solely in the interest of plan participants, follow the plan documents, hold plan assets in trust, and ensure the plan's fees are reasonable. A fiduciary who breaks those rules can be held personally liable to repay the plan’s losses. Fully insured employers have fiduciary duties, too, but the carrier holds the money and decides the claims. A self-insured employer takes on that role, even when a TPA processes the claims.
The third responsibility is administrative. Someone must process claims, track eligibility, issue ID cards, and answer employee questions. Many self-insured employers hire a TPA for this work. Often it is the same carrier they used before, now paid an administrative fee instead of a premium. The TPA handles the paperwork, but the employer remains legally responsible for how the plan runs, including whether claims are paid correctly and whether the TPA’s fees are reasonable.
New access: claims data and plan design flexibility
In return for those responsibilities, a self-insured employer gets two things a fully insured employer usually doesn’t. The first is its own claims data. With a fully insured plan, the carrier keeps the detailed records of every claim, and the employer may only see summary reports. A self-insured employer’s plan pays every bill, so the employer owns that record and can see which conditions, which hospitals, and which doctors its money goes to.
The second is control over plan design. Rather than choosing from the plan a carrier offers, a self-insured employer can build its own. It can set its own deductibles, decide which benefits to offer, add a vendor for a specific condition such as diabetes, or build a financial incentive into the plan without waiting for a carrier to approve it. The employer keeps the savings from those choices. A well-managed self-funded plan reduces total healthcare spending by 8–10%, estimates Marsh McLennan Agency.
For a self-insured employer, running the plan well and keeping its costs down become the same work. Every dollar in claims data is a dollar the employer paid, so understanding what drives that spending can help the benefits team design strategies to reduce it. High spending might come from a handful of high-cost claims, a hospital charging far above the market, or doctors ordering procedures the evidence does not support. Research on the importance of doctor performance, based on Garner’s analysis of 45 billion claims records, found that the best-performing doctors provided 70% less of that low-value care than their underperforming peers in the same hospital system.
Garner is one example of how self-insured employers put their claims data to work. It identifies the best-performing doctors in the employer's existing network, then helps cover employees’ out-of-pocket costs when they see them, with no network changes required. The plan stays the same, while the incentive guides more care to the doctors with the best results.
How being self-insured changes your strategy
Becoming self-insured moves an employer from administering a plan to managing its costs. A fully insured employer learns its plan cost once a year, at renewal, while a self-insured employer can see costs claim by claim. This shows the employer where its healthcare spending goes. Employers who act on this data, rather than simply paying the bills, get the most savings from self-insuring.
The first step to getting more savings from a self-insured plan is examining the claims data itself. It shows what drives spend, including how much depends on which doctors employees see. Pharmacy and hospital prices matter too, and the report on what is driving the healthcare cost crisis lays out each of those drivers. But provider quality is one cost driver a self-insured employer can act on without changing the network, the carrier, or the plan design, so it's the best place to start when examining the data.
For a self-insured employer, claims data can show far more than a premium bill ever could. See what it shows about provider quality in your plan.
FAQs
What is a self-insured employer?
A self-insured employer pays its employees' medical claims from its own funds instead of paying a fixed premium to an insurance carrier. The employer holds the financial risk, so a year with high claims costs more and a year with low claims costs less. Most self-insured employers buy stop-loss insurance to cap very large claims, and many hire a third-party administrator to process claims.
Is self-insured the same as self-funded?
Yes. Self-insured and self-funded both describe an employer paying its own employees' medical claims rather than transferring that risk to an insurance carrier. The two terms have no legal or financial difference. Either way, the plan is regulated under ERISA, the federal law for employer benefit plans, rather than by state insurance laws.
What are the responsibilities of a self-insured employer?
A self-insured employer must pay employees' medical claims, meet ERISA fiduciary duties, and ensure the plan is administered correctly. Fiduciary duties include acting solely in participants' best interests, following the plan documents, holding plan assets in trust, and paying only reasonable fees. A third-party administrator can handle day-to-day processing, but the employer remains legally responsible.
Can a self-insured employer keep the same network and carrier?
Yes. Self-insured status changes who holds the claims risk, not which doctors employees can see. Many employers keep the same provider network and hire their former carrier as a third-party administrator under an administrative services-only contract. The carrier processes claims, gives employees access to its provider network at negotiated prices, and handles customer service for a fee, while the employer pays the actual claims.
What are the benefits of becoming a self-insured employer?
The main benefits of becoming a self-insured employer are lower cost, access to claims data, and control over plan design. A self-funded plan avoids state premium taxes and the carrier profit margin built into fully insured premiums. Marsh McLennan Agency estimates that a well-managed self-funded plan can reduce total healthcare spending by 8–10%. Because state benefit mandates don't apply, employers can also design the plan around their own workforce. Just as important, employers can see their own claims data and use it to find and address what is actually driving costs.