How to Transition from Fully Insured to Self-Insured
Key Takeaways
- Self-funding trades the carrier's fixed premium for direct claims responsibility, and in exchange the employer keeps the surplus, owns the claims data, and controls plan design.
- Readiness comes down to four factors: financial reserves, workforce and claims profile, administrative capacity, and a leadership team willing to manage year-to-year variability.
- The savings and data advantages of self-funding hinge on how you set up stop-loss, administration, and plan design before launch. Getting the setup wrong can undercut the savings.
Employer healthcare costs are projected to rise 9.5% in 2026, pushing average spend past $17,000 per employee for the first time. Numbers like that reframe the question of being self-insured vs. fully insured. It is no longer an administrative detail buried in renewal paperwork but a strategic decision about who controls your healthcare dollars, and staying fully insured is itself a choice with a tangible cost. Much of the market has already made the shift: 67% of covered workers are now enrolled in self-funded plans. If self-funding is already on the table for your organization, the work now is understanding the full scope of what the transition requires before the next renewal window.
Fully Insured vs. Self-Funded: What Changes When You Switch
The difference between the two models comes down to one question: who holds the risk? Under a fully insured plan, you pay a fixed premium and the carrier absorbs whatever the claims turn out to be. Under a self-funded plan, you pay claims as they come and carry the risk yourself, buying stop-loss insurance to cap the downside. That single shift decides who controls the claims data, how predictable your monthly costs are, and how much of your spend goes to something other than actual care. Here’s how the core differences break down side by side:
That difference isn't just theoretical. Well-managed self-funded plans reduce total healthcare spending by 8 – 10%, driven by avoiding state premium taxes (roughly 2 – 3%) and eliminating carrier profit margins and administrative fees (another 3 – 8%), according to Marsh McLennan Agency.
How Fully Insured Plans Work: Predictable Costs, Limited Control
With a fully insured plan, the employer pays a fixed monthly premium, while the carrier pays claims, absorbs overruns, and keeps whatever is left over when claims come in below the premiums it collected. That predictability has real value: healthcare becomes a stable line item with no month-to-month variability.
In exchange, what the employer gives up is control. The carrier owns the plan design and the claims data, so the annual renewal arrives as a number the employer is expected to accept rather than a breakdown they can actually examine and act on. Additionally, a healthy year in which claims do not exceed the premium generates no refund for the employer. And anyone trying to understand what is driving spend is usually left without a clear answer.
How Self-Insured Plans Work: Greater Control, Potential for Savings
With a self-funded plan, the employer pays claims directly from its own funds, typically through a third-party administrator (TPA) that processes claims, manages paperwork, and handles the day-to-day operations a carrier would otherwise perform. Most self-funded employers also buy stop-loss insurance, which reimburses the plan once claims pass a set threshold, capping exposure to catastrophic claims.
Monthly costs vary with actual utilization, which demands more from a finance team. In return, the employer keeps surplus dollars in low-claims years, gains complete visibility into where every dollar goes, and takes control of plan design. Because self-funded plans fall under ERISA rather than state insurance mandates, the employer decides what the plan covers, how cost-sharing is structured, and which programs to include. In other words, budget predictability gives way to strategic flexibility.
The Case for Self-Funding: Why Employers Are Making the Switch
The 8 – 10% cost differential stated above gets employers’ attention, but self-funded employers describe claims data as the more valuable asset. Fully insured employers negotiate renewals blind. Self-funded employers, on the other hand, can see which conditions, facilities, and providers drive their spend. And that visibility pays off in more ways than one. It reveals whether the structural forces driving employer healthcare costs, from hospital price inflation to AI-enabled upcoding, are showing up in your population. And it exposes whether employees actually use the programs you buy, or if you have an engagement problem.
Data visibility also unlocks new ways to think about your benefits strategy. For example, fully insured employers have few levers to pull beyond shifting costs to employees, and years of rising deductibles have largely exhausted that option. Those who are self-insured are free to explore new, performance-based solutions that steer utilization rather than shift costs. Garner, for example, works across both self-funded and fully insured plans, but self-funded employers will gain the greatest visibility into where spend is going and which providers are driving that cost.
Are You Ready to Make the Switch? A Pre-Transition Readiness Assessment
This is the question that separates employers who transition successfully from those who stall or reverse course after one bad claims year. Most advisors put the floor for standalone self-funding at around 100 to 200 covered employees: the point where a group's claims are predictable enough to price and a single rough stretch won't sink the budget.
For smaller employers, there are still options. Level funding, for instance, blends a small self-funded layer with strong stop-loss coverage. The employer pays a fixed monthly amount that behaves like a premium, and if claims come in below projections, some or all of the surplus comes back at the end of the year.
Self-funded readiness really comes down to four things: finances, workforce, operations, and culture.
Financial Readiness: Cash Flow, Claims Volatility, and Risk Appetite
Ready: Enough cash reserves to absorb a quarter where claims run 25% above expected, stable operating cash flow, and a finance team that has modeled the worst realistic year rather than the average one.
Not yet ready: month-to-month cash constraints or a balance sheet where a single $250,000 claim would force cuts elsewhere. Stop-loss limits the damage, but the employer still funds claims up to the attachment point, and that unpredictability has to be funded from somewhere.
Workforce and Claims Profile Readiness
Ready: stable workforce, two to three years of credible claims history, and a clear-eyed view of known cost drivers.
Not yet ready: high turnover that makes claims experience unreliable, no access to historical claims data because the carrier will not release it, or an unexamined population without actuarial analysis.
Operational and Administrative Readiness
Ready: named internal owner for plan governance, capacity to handle ERISA fiduciary duties, Form 5500 filings, and nondiscrimination testing. Plus, an advisor with genuine self-funding experience.
Not yet ready: HR team of one absorbing plan administration on top of an existing full-time job. Self-funding is not a set-and-forget arrangement. It is an operating responsibility, and underestimating the administrative load is among the most common reasons employers revert to fully insured within two years.
Cultural and Leadership Readiness
Ready: executive team that treats claims variance as a budgeting reality rather than a failure, and a CFO and HR leader who share the same definition of success before the first invoice arrives.
Not yet ready: leadership that expects self-funding to behave like a premium, or a culture where one expensive quarter triggers pressure to reverse course. The employers who stay self-funded decide in advance how they will respond to a bad year. The ones who stall never had that conversation.
The Transition Mechanics: Stop-Loss, TPAs, and Plan Design
Three structural components make self-insurance work. Each gets selected and configured during the transition window, which is typically the four to six months before the plan's effective date.
Choosing Your Stop-Loss Coverage: Specific, Aggregate, and Attachment Points
About 87% of self-funded employers carry at least one stop-loss policy, of which there are two primary types: specific and aggregate. Specific stop-loss caps your exposure to any single member's claims, while aggregate stop-loss caps total plan claims for the year. Typical specific attachment points run $50,000 – $150,000 per member for mid-market employers, with large employers setting higher thresholds because they can absorb more individual claim risk. Aggregate stop-loss commonly attaches at 115 – 125% of expected claims, meaning the insurer steps in once total claims exceed that corridor. How high you set the attachment point comes down to how much risk you're willing to carry: lower attachment points cost more in premium and return more certainty.
Selecting a TPA: What to Evaluate and What to Avoid
When choosing a TPA, there are three important things to evaluate: data transparency, network arrangements, and fee clarity. A strong TPA returns complete claims data in usable formats, integrates cleanly with the vendors and point solutions you layer on, and prices administration on a transparent per-employee basis. Avoid arrangements that obscure your own claims data behind proprietary reporting, bundle services in ways that make fees impossible to unpack, or lock you into networks and vendors through the administration contract. The entire strategic case for self-funding rests on visibility, and a TPA that limits visibility defeats the purpose of the switch.
Plan Design Decisions: Benefits, Networks, and Cost-Sharing
Self-funded employers typically rent a major carrier's network through the TPA or an administrative services arrangement, so employees keep familiar access while the employer gains design control. Don’t be afraid to scrutinize the network you rent. Cost-sharing architecture, deductibles, copays, and out-of-pocket maximums deserve the same intentionality.
Newer mechanisms like the first-dollar HSA incentive show how plan design can reward smart care decisions instead of simply shifting cost onto employees. That same design freedom lets employers build steering directly into the plan. Garner, for example, uses claims data to identify the highest-performing doctors in each specialty and guides employees toward them, making provider quality a design decision rather than a matter of chance.
Is Self-Insurance Right for Your Organization?
If you’re considering switching to a self-insured plan, remember to consider the four variables. Financial readiness determines how much risk you are actually taking on. Workforce size determines whether your claims experience is credible. Administrative capacity determines whether the plan gets governed or neglected. And leadership alignment determines whether the organization stays committed through the inevitable bad quarter. If you’re confident about all four, the financial logic likely favors a switch. However, if you fall short on any one category, you should likely either stay with your current plan or consider level funding as a credible intermediate step.
Whatever funding structure you land on, controlling healthcare costs ultimately requires directing employees to higher-performing providers. Garner works with employers across both plan types to reduce medical trend through data-driven provider steering, with no carrier or network changes required, making it a relevant next step for any organization evaluating its benefits strategy. To see how provider steering fits your funding model, request a demo.
FAQs
At what company size does self-insurance become financially viable?
Most advisors place the threshold for standalone self-funding at around 100 to 200 covered employees, the point where claims experience becomes statistically credible, and volatility becomes manageable. Smaller employers are not shut out: level-funded plans and group captives extend self-funding economics to organizations well below that line, and 37% of covered workers at small firms are already in level-funded arrangements. The honest answer depends less on headcount alone than on cash reserves, claims history, and risk tolerance.
What is level-funded health insurance vs. fully self-insured?
Level funding is a hybrid model between a fully insured and self-insured plan. The employer pays a fixed monthly amount that bundles expected claims, administration, and stop-loss premiums, and in return, receives some or all of the surplus back if claims run below projections. Fully self-insured employers instead pay claims as they occur, accepting month-to-month variance in exchange for maximum flexibility, full data ownership, and no carrier margin built into a bundled rate. Level funding suits smaller employers testing the model; full self-funding suits organizations ready to own the risk directly.
Can a self-insured employer still use a major carrier's network?
Yes. Most self-funded employers rent a national carrier's network through their TPA or through an administrative services only (ASO) arrangement with the carrier itself. Employees keep the same provider access and often the same ID card experience, while the employer takes on the funding and gains control of the plan behind the scenes. Network rental fees are part of the administrative cost structure, so compare them across TPAs during selection.