Every year at renewal, the same conversation happens in the same conference room. The broker sets down the quote, clears their throat, and explains that premiums are going up again. You ask why. They point to the market, claims trends, the usual suspects. You sign. Twelve months later, you do it all over again.
The question almost nobody gets asked is whether the plan structure itself is still the right one. Self-funded vs. fully-insured is the biggest fork in the road for how a company pays for employee health coverage — and for most businesses, it’s a fork they’ve never actively chosen. They just ended up on the fully-insured road by default.
What is a fully-insured health plan?
A fully-insured health plan is the traditional arrangement most small and mid-sized businesses know. The employer pays a fixed monthly premium to an insurance carrier — Aetna, Cigna, BlueCross, UnitedHealthcare — and the carrier takes on all the risk. If claims come in higher than expected, the carrier absorbs it. If claims come in lower, the carrier keeps the difference.
The carrier is responsible for:
- Setting the premium
- Paying claims
- Administering the plan
- Absorbing the risk of a bad year
- Building profit and reserves into the rate
The employer is responsible for paying the premium and distributing ID cards. That’s roughly it. The simplicity is the whole pitch.
The cost of that simplicity is that you’re paying not just for your team’s healthcare, but also for the carrier’s profit margin, their reserve requirements, their administrative overhead, and a subsidy for other employers in the risk pool whose teams use more care than yours. In a healthy year, all of that money leaves your business and never comes back.
What is a self-funded health plan?
A self-funded health plan — sometimes called a self-insured plan — flips that structure. Instead of paying a fixed premium to a carrier, the employer sets aside funds and pays claims directly as they’re incurred. The carrier (or a third-party administrator) still processes claims and provides network access, but they’re doing it on the employer’s behalf, not as the risk-taker.
In a self-funded plan, the employer is responsible for:
- Funding claims as they come in
- Paying a fixed administrative fee to the TPA or carrier that runs the plan
- Buying stop-loss insurance to cap exposure on catastrophic claims
- Seeing, and acting on, the actual claims data
The result: when claims are lower than expected, the savings stay with the employer. When claims are higher, stop-loss covers the excess above a defined threshold. The employer trades fixed predictability for transparency, control, and upside.
In a fully-insured plan, the only number you ever see is next year’s rate. In a self-funded plan, you see where every dollar went — and you can actually do something about it.
Self-funded vs. fully-insured: a side-by-side breakdown
| Factor | Fully-Insured | Self-Funded |
|---|---|---|
| Who pays claims | Carrier | Employer (with stop-loss backstop) |
| Monthly cost | Fixed premium | Variable (claims + admin + stop-loss) |
| Claims data visibility | Limited or none | Full access |
| Regulatory framework | State insurance law | ERISA (federal) |
| Good-year savings | Kept by carrier | Kept by employer |
| Plan design flexibility | Limited to carrier offerings | Highly customizable |
| Administrative complexity | Low | Moderate |
| Cash flow predictability | High | Moderate (smoothed by level-funding) |
| Typical company size | Any | 25+ (or 10+ with level-funding) |
The table makes the trade-off clear: fully-insured optimizes for simplicity, self-funded optimizes for everything else.
Why most small businesses are defaulted into fully-insured plans
If self-funding is so often the better deal, why isn’t everyone doing it? The answer has more to do with distribution than economics.
Brokers earn commissions on fully-insured premiums. In a commission-based arrangement, the broker’s income rises and falls with your premium. That creates a soft disincentive to recommend a structure that would lower the premium base. Not every broker operates this way — flat-fee and transparent consulting arrangements exist — but it’s the industry norm.
Carriers market aggressively to small employers. Fully-insured products are the easiest thing for a carrier to sell. They’re pre-packaged, they protect the carrier’s margin, and they lock employers into multi-year relationships. Self-funded arrangements require more work to quote and service.
Small employers don’t see their claims data. Without visibility, it’s nearly impossible for an employer to evaluate whether their current plan is priced fairly. You can’t negotiate what you can’t see. This information gap is the single biggest reason premiums keep climbing year after year.
The net result is a market where the default option is also the most expensive option, and very few employers ever get shown the alternatives.
When self-funded makes sense (and when it doesn’t)
Self-funding works well for some employers and poorly for others. The distinction is mostly about demographics, cash flow, and engagement.
Employers who benefit most from self-funding have teams that skew younger or healthier than the broader risk pool, stable and predictable claims experience, and enough cash flow cushion to absorb month-to-month variability. They want visibility into where their healthcare dollars go, and they’re willing to engage with plan design decisions. Most employers with 25 or more employees (or 10+ for a level-funded structure) should at least model the comparison.
Self-funding is a poor fit when a team has known, ongoing high-cost claimants that drive up stop-loss quotes, when cash flow can’t absorb claims variance, when the group has fewer than 10 employees (stop-loss economics break down at that scale), or when leadership doesn’t want to be involved in plan design.
For businesses that fit the first list but aren’t ready to jump fully into self-funding, level-funded plans are the logical middle step. They smooth the cash flow into a fixed monthly payment while still giving you access to your data and surplus-sharing when claims run low.
Stop-loss: the piece that makes self-funding safe
The concern almost every employer raises about self-funding is the same: what happens if someone on our team has a catastrophic claim? The answer is stop-loss insurance.
Stop-loss is a separate policy that sits behind your self-funded plan and caps your exposure. There are two types, and most employers carry both:
- Specific stop-loss protects against any single individual’s claims exceeding a defined threshold for the year
- Aggregate stop-loss protects against your total claims across the whole group running above a defined ceiling, expressed as a percentage above projected annual claims
With a well-designed stop-loss policy, your worst-case financial outcome in a self-funded plan is defined and predictable. You’re not exposed to unlimited downside. That’s the piece that reframes self-funding from “risky” to “calculated.”
For a deeper walk-through of how stop-loss coverage actually works, see What Is Stop-Loss Insurance and Why Every Self-Funded Employer Needs It and Aggregate vs. Specific Stop-Loss.
How to actually decide
The decision usually comes down to three questions.
1. Do you have visibility into your current claims experience? If you don’t, that alone is an argument for exploring alternatives. Claims data is yours in principle, and it’s the single most important input to any benefits decision.
2. Is your team healthier than the average pool the carrier is pricing you against? If yes, fully-insured is mathematically overpricing you. The broader the pool, the more you subsidize. A level-funded or self-funded structure lets you benefit from your own favorable experience.
3. Can your cash flow handle month-to-month variability? Fully self-funded plans vary month to month based on actual claims. Level-funded plans fix that variability at the cost of a slightly higher expected spend. Both protect you from catastrophe with stop-loss. Pick the one your finance team can live with.
The most common path we see at Kingsfoil Health is a progression: employers start fully-insured, get tired of years of double-digit renewal increases, move to level-funded for one plan year to see their data, and then make a more informed decision about whether to stay there or move to full self-funding.
Where to start
For most employers with 25 or more employees and healthy claims experience, the fully-insured default is costing them real money every year. They don’t know it because they’ve never been shown the data.
Get the data first. The structure decision follows.
Ready to see what your numbers actually look like? Download The Rate Shock Survival Guide — a free, practical walk-through of how to evaluate your current plan, ask the right questions at renewal, and tell whether an alternative structure would genuinely save your business money. Get your copy here.