Key Takeaways
- Fully-insured plans transfer all financial risk to the carrier in exchange for a fixed premium — the employer pays the same amount whether claims are high or low.
- Self-funded plans keep risk with the employer but eliminate carrier profit margins, risk charges, and premium taxes — typically saving 8 to 15%.
- The carrier's loss ratio is the single most revealing number in a fully-insured arrangement — most employers have never seen it.
- ERISA preemption applies only to self-funded plans, giving them far more design flexibility than fully-insured plans subject to state mandates.
- The decision is not binary — level-funded plans offer a hybrid entry point for smaller employers not yet ready for full self-funding.
The Core Difference: Who Bears the Risk
In a fully-insured plan, the employer pays a fixed monthly premium to an insurance carrier. The carrier assumes all financial risk for claims. If your employees have a healthy year, the carrier keeps the surplus. If they have a catastrophic year, the carrier absorbs the loss. The employer's cost is predictable — but that predictability comes at a steep price.
In a self-funded plan, the employer pays claims directly as they are incurred. The employer bears the financial risk — but also captures the upside when claims are favorable. Stop-loss insurance caps the downside exposure, making the risk manageable for most employers.
The fully-insured premium is not just claims plus administration. It includes the carrier's profit margin (typically 3 to 5%), a risk charge for assuming your claims volatility (2 to 4%), state premium taxes (2 to 3%), and ACA fees. You are paying for certainty — and certainty is expensive.
Ask your carrier for your group's loss ratio — the percentage of your premium that went to actual paid claims. If your loss ratio is below 80%, you are significantly overpaying for the risk transfer. Many employers discover loss ratios of 60 to 70%, meaning 30 to 40 cents of every premium dollar went to something other than employee healthcare.
Carriers are not required to share your group's loss ratio unless you ask — and many brokers never ask on your behalf. If your broker cannot produce your loss ratio history for the past 3 years, that is a red flag about the quality of your advisory relationship.
What You Give Up in a Fully-Insured Plan
Beyond the cost premium, fully-insured plans come with structural limitations that constrain your ability to manage healthcare costs over time.
- No claims data: carriers own your data and are not required to share it in usable form. You cannot identify high-cost claimants, wasteful utilization patterns, or PBM spread pricing.
- No plan design flexibility: state insurance mandates apply to fully-insured plans. You must cover what the state requires, even if it does not fit your workforce.
- No vendor choice: the carrier controls the network, the PBM, and often the care management programs. You take what they offer.
- No surplus retention: if your employees have a healthy year, the carrier keeps the difference. You get a renewal quote, not a refund.
- Renewal opacity: carriers set renewal rates based on your claims experience plus trend factors you cannot independently verify.
The lack of claims data is not just an inconvenience — it is a strategic disability. Every cost-containment strategy in this learning portal requires claims data to implement effectively. Without it, you are managing healthcare costs blind.
State insurance mandates vary significantly. Some states mandate coverage for fertility treatments, autism therapy, chiropractic care, and dozens of other services. Fully-insured employers in high-mandate states pay for all of it whether their workforce needs it or not. Self-funded plans under ERISA are exempt from most of these mandates.
The Financial Comparison
| Factor | Fully Insured | Self-Funded |
|---|---|---|
| Monthly cost | Fixed premium regardless of claims | Variable — actual claims plus fixed admin |
| Carrier profit margin | Included in premium (3–5%) | Eliminated |
| Risk charge | Included in premium (2–4%) | Replaced by stop-loss premium (lower cost) |
| State premium tax | Included (2–3%) | Not applicable under ERISA |
| Surplus if claims are low | Carrier keeps it | Employer retains it |
| Claims data access | None or limited | Full, real-time access |
| Plan design flexibility | Limited by state mandates | Broad under ERISA |
| Catastrophic claim protection | Carrier absorbs all risk | Stop-loss insurance covers above attachment point |
A useful rule of thumb: for every 100 employees, a well-structured self-funded plan typically saves $150,000 to $300,000 per year compared to a fully-insured alternative — before any active cost-containment programs are layered on. The savings come from eliminating carrier overhead, not from cutting benefits.
Do not compare a self-funded plan's actual claims to a fully-insured premium and declare victory. The right comparison is self-funded total cost (claims plus stop-loss plus admin) versus what the fully-insured premium would have been for the same year. Many employers undercount their self-funded costs and overstate the savings.
Level-Funded: The Hybrid Entry Point
Level-funded plans occupy the middle ground between fully-insured and self-funded. The employer pays a fixed monthly amount — like a fully-insured premium — but that amount is divided into three buckets: a claims fund, a stop-loss premium, and an administration fee.
If claims come in under budget at year end, the employer receives a refund of the unused claims fund balance. If claims exceed the fund, stop-loss coverage kicks in. The employer gets the predictability of a fixed monthly payment with the upside potential of self-funding.
Level-funded plans are the fastest-growing segment of the small group market. For employers with 25 to 100 employees who are not ready for full self-funding, a level-funded plan is often the right first step — it provides claims data, refund potential, and a lower-risk introduction to self-funding mechanics.
When evaluating a level-funded plan, ask for the claims fund refund provision in writing. Some carriers set the claims fund so conservatively that refunds are rare. Others set it at a realistic expected claims level, making refunds common in healthy years. The claims fund percentage relative to total premium is the key number to scrutinize.
Level-funded plans are still regulated as fully-insured in most states — meaning state insurance mandates still apply. The claims data access and refund potential are real advantages, but the ERISA preemption benefit of true self-funding does not apply to level-funded arrangements in most jurisdictions.
Making the Decision
The fully-insured versus self-funded decision is not purely financial. It involves your organization's risk tolerance, administrative capacity, and strategic appetite for managing healthcare as a business function rather than a vendor relationship.
- Under 25 employees: fully-insured or level-funded is usually appropriate. Claims volume is too low for statistical credibility.
- 25 to 99 employees: level-funded is the natural entry point. True self-funding is viable with the right stop-loss structure.
- 100 to 499 employees: self-funding is almost always the better financial choice. The question is how aggressively to manage the plan.
- 500+ employees: self-funding is the standard. The focus should be on optimizing the structure, not debating the model.
The best time to make the switch is at renewal — when you have leverage with your current carrier and time to evaluate alternatives. Start the analysis 6 months before your renewal date. Waiting until 60 days out limits your options and your negotiating position.
Do not let your fully-insured carrier model a self-funded alternative for you. They have a financial incentive to make self-funding look unattractive. Get an independent analysis from a consultant or TPA who does not benefit from keeping you fully-insured.
The real question is not "can we afford to self-fund?" — it is "can we afford to keep overpaying for fully-insured coverage?" For most employers above 100 lives, the answer to the second question is increasingly no.
Your Action Steps
- 1Request your group's loss ratio from your carrier for each of the past 3 plan years.
- 2Calculate your total fully-insured premium spend over the past 3 years and compare it to your paid claims.
- 3Ask your broker to produce a side-by-side financial model: fully-insured renewal versus self-funded with stop-loss.
- 4If you have 25 to 100 employees, request level-funded quotes from at least 2 carriers alongside your fully-insured renewal.
- 5Identify whether your state has insurance mandates that would not apply under a self-funded ERISA plan.
- 6Use the Self-Funding Readiness tool at /tools/self-funding-readiness to score your organization's readiness for the transition.
Knowledge Check
5 questions · passing score 4/5
Test your understanding of this module. You need 4 out of 5 correct to pass. You can retake the quiz as many times as you like.
Run the numbers for your own situation.