A practical guide for CFOs and HR Directors considering the move from fully-insured to self-funded health plans. No jargon. No sales pitch. Just the information you need to make a sound decision.
If you've spent any time researching self-funded health plans, you've probably encountered a wall of acronyms — TPA, ASO, stop-loss, IBNR, aggregate corridor — and walked away more confused than when you started. That's partly by design. The traditional benefits industry benefits from complexity. We're going to cut through it.
In a fully insured health plan, you pay a fixed premium to an insurance carrier every month. The carrier assumes all the risk: if your employees have a bad claims year, the carrier absorbs the loss. In exchange for taking that risk, the carrier keeps any surplus if your employees have a good year. You never see your claims data. You have no leverage at renewal. You pay more every year because the carrier is pricing for the average of thousands of employer groups — not for the specific health profile of yours.
In a self-funded plan, you assume the financial risk of paying employee claims directly. Instead of a fixed premium, you pay actual claims as they occur — processed through a Third Party Administrator (TPA), which handles the administrative mechanics of the plan. Your premiums are replaced by a monthly funding amount that covers estimated claims, plus TPA fees and stop-loss premiums. At the end of the year, if your claims come in below your projections, you keep the surplus.
Fully insured: you pay a fixed amount, the carrier keeps the upside.
Self-funded: you pay actual costs, you keep the upside — and you know exactly where every dollar goes.
It's not going bare. Self-funding without stop-loss protection would be reckless, and no reputable advisor would structure a plan that way. Stop-loss insurance caps your exposure — both on a per-member basis (specific stop-loss) and on a total plan basis (aggregate stop-loss). We cover this in detail in Chapter 3.
It's not just for large employers. Fortune 500 companies have been self-funding for decades, but mid-market employers — those with 100 to 5,000 employees — are increasingly well-suited for it. The economics have shifted. Stop-loss products have become more competitive. TPAs have become more sophisticated. The barriers to entry are lower than ever.
It's not more complicated for your employees. From a member's perspective, the experience is identical. Same ID card. Same network. Same pharmacy benefits. Same claims process. The change is entirely on the back end — in how the plan is funded and managed. Employees don't notice.
The typical fully insured employer is paying for three things they don't always realize: the carrier's risk margin, the carrier's administrative overhead, and the carrier's profit. In aggregate, these components typically represent 15–25% of your premium. Self-funding eliminates the risk margin and gives you direct control over the administrative layer. For a $2M annual premium, that's $300K–$500K in structural cost that simply disappears from the equation — in year one.
Beyond the cost reduction, the more transformative change is access to data. In a self-funded plan, you own your claims data. You can see every dollar of spend, identify cost drivers, target interventions, and redesign your plan with precision. That visibility is what enables sustainable cost management — not just a one-year win.
Not every employer is a strong self-funding candidate. A good benefits advisor will tell you that upfront — and walk away if the fit isn't right. This chapter lays out the criteria we actually use when evaluating a prospective client. We'd rather give you an honest framework than oversell a solution that doesn't fit.
The single biggest driver of self-funding viability is group size. With more employees, your claims experience becomes more predictable — and predictability is what makes self-funding work.
Claims are statistically credible. Stop-loss is competitively priced. Full self-funding is almost always the right structure.
Often viable, especially with favorable demographics. A detailed claims analysis is required before recommending. Level-funding may be a sensible first step.
Volatility risk is real at this size. Level-funding or a captive arrangement may be a better entry point. Full self-funding needs careful stop-loss structuring.
Ideally, we want three years of claims data before making a recommendation. This allows us to identify cost trends, flag high-cost claimants, assess pharmacy exposure, and build an accurate actuarial model. If you've been with the same carrier, they're required under ERISA to provide this data upon request — though some carriers make it difficult. We help clients obtain it.
We're looking for: what your loss ratio has been over time, whether your claims are concentrated in a small number of individuals, how your pharmacy spend breaks down between generic, brand, and specialty, and whether you have any chronic condition clusters in your population that would affect plan design.
We can still do a preliminary analysis using demographic data, industry benchmarks, and publicly available claims norms for your employee profile. It's less precise, but it's often enough to establish whether self-funding is worth pursuing in detail.
Age distribution matters. A workforce skewing older will have higher expected claims and higher stop-loss costs. That doesn't make self-funding wrong — it changes the financial model. A younger workforce typically produces lower loss ratios and more favorable stop-loss pricing, which accelerates the economic benefit.
Geographic concentration also matters for network access. A multi-state workforce adds complexity to network design. A single-site employer has an easier path.
Self-funding requires that you have the balance sheet to absorb monthly claims variability. While stop-loss puts a ceiling on your exposure, your month-to-month cash flow will fluctuate in a way that a fixed premium does not. Most self-funded plans establish a claims reserve — typically two to three months of expected claims — funded at inception. You need the liquidity to fund that reserve at inception.
We also have a frank conversation about risk appetite. Some CFOs are entirely comfortable with claims variability once they understand the stop-loss structure. Others aren't — and that's a legitimate preference. If complete cost certainty is a hard requirement, level-funding offers a middle path.
The most underestimated factor. Self-funding works best when HR and Finance are aligned, leadership understands the model, and there's organizational will to use the data. We've seen technically sound self-funded plans underperform because no one was looking at the claims reports or acting on the insights. The plan is only as good as the team managing it.
Stop-loss insurance is the mechanism that transforms self-funding from a concept for self-insured giants into a viable strategy for mid-market employers. Without it, a single catastrophic claim could threaten a company's financial stability. With it, your worst-case exposure is known, capped, and manageable — before the plan year starts.
Specific stop-loss (also called individual stop-loss) protects against any single member's claims exceeding a defined threshold — typically called the specific deductible. Once an individual's claims cross that threshold, the stop-loss carrier reimburses the excess. If your specific deductible is $100,000 and a member has a $400,000 cancer claim, you pay $100,000 and the stop-loss carrier pays $300,000.
Aggregate stop-loss protects against your total plan liability for the year exceeding a defined ceiling — typically 125% of expected claims. If your plan runs worse than expected across the board, aggregate stop-loss kicks in once total claims exceed the aggregate attachment point. This is your protection against a bad year across the whole population, not just a single catastrophic claim.
Think of it like a deductible on your homeowner's policy. You pay claims below the deductible. The insurer pays above it. The right specific deductible for your group depends on your size, claims history, and risk tolerance.
This is one of the most consequential decisions in structuring a self-funded plan. Setting the deductible too low means you're paying significant stop-loss premium to cover claims that your plan could absorb without breaking the budget. Setting it too high leaves you exposed to claims volatility that creates cash flow problems.
For most mid-market employers, specific deductibles range from $75,000 to $200,000. Larger groups with more claims credibility can carry higher deductibles and capture more of the savings opportunity. Smaller groups should carry lower deductibles to reduce volatility, even though it costs more in stop-loss premium. We model multiple deductible scenarios for every client so the decision is informed, not a guess.
Stop-loss is a competitive market, and shopping it aggressively matters. Unlike the fully insured market — where your leverage at renewal is limited — stop-loss can and should be bid every year. Carriers reprice based on your recent claims experience, and their initial renewal offers are rarely their best. A disciplined bid process typically produces meaningfully better pricing than accepting a carrier's first offer.
One dynamic to watch: lasering. If a member has a known high-cost condition, a stop-loss carrier may apply a higher specific deductible to that individual, or exclude them entirely. This is a legitimate underwriting practice, but it needs to be anticipated and managed. A good advisor will identify likely laser candidates before going to market and structure the bid accordingly.
Not all stop-loss contracts are created equal. The terms that create the most employer exposure are: run-in and run-out provisions (who pays for claims incurred in one plan year but submitted in another), terminal liability clauses (what happens when you leave the carrier), and the difference between paid and incurred contract structures. We review every contract term with clients before signing — because what looks like a competitive premium can come with contract language that eliminates the savings in a bad year.
Pharmacy is the fastest-growing component of employer health costs — and the most opaque. For most fully insured employers, pharmacy spend is buried inside the carrier's overall premium. They have no idea what they're actually paying per drug, what rebates are being collected on their behalf, or whether their PBM is working for them or against them. Self-funding changes the picture entirely.
A Pharmacy Benefit Manager (PBM) is the intermediary between your health plan and the pharmacy network. In theory, PBMs use their purchasing power to negotiate lower drug prices and pass the savings to employers. In practice, the three largest PBMs — which control roughly 80% of the market — have turned their position into a highly profitable arbitrage business at employers' expense.
Spread pricing is the most direct mechanism. The PBM charges your plan one price for a drug and pays the pharmacy a lower price — keeping the difference as profit. On generic drugs, these spreads can be 200–400% of the actual drug cost. Your plan is paying $30 for a generic that the pharmacy was reimbursed $7 for. The PBM keeps $23.
Rebate retention is equally significant. Pharmaceutical manufacturers pay PBMs significant rebates — essentially volume discounts — to achieve favorable formulary placement. These rebates can represent 20–40% of brand drug costs. In a "rebate-sharing" arrangement, the PBM returns some of these to the employer. In a "rebate retention" arrangement — the default in most bundled carrier contracts — the PBM keeps them entirely.
For a 300-employee employer spending $500K annually on pharmacy, spread pricing and retained rebates together commonly represent $100,000–$200,000 per year in costs that disappear into the PBM's margin. That's real money — and it's recoverable.
The alternative is a transparent, pass-through PBM arrangement. In a pass-through model, the PBM charges a flat administrative fee (typically per member per month) and passes through 100% of drug costs and 100% of rebates to the employer. There is no spread pricing. There is no rebate retention. What the pharmacy gets paid is what the plan pays — plus a known, disclosed administrative fee.
Self-funded employers can access pass-through PBM arrangements directly — something essentially unavailable to fully insured employers, whose pharmacy benefits are bundled into the carrier contract. This is one of the most concrete financial advantages of self-funding: the ability to carve out pharmacy and contract with a transparent PBM.
Specialty drugs — biologics, oncology agents, gene therapies — represent roughly 50% of pharmacy spend for a typical employer plan, despite being used by fewer than 5% of members. The biosimilar revolution is changing this landscape rapidly. FDA-approved biosimilars are now available for many of the highest-cost specialty drugs at 20–40% lower cost than the reference biologic.
Managing this effectively requires an active formulary strategy — not just a list that auto-renews each year. We work with clients to identify biosimilar conversion opportunities, implement appropriate utilization management, and set up specialty pharmacy channels that produce better outcomes at lower cost.
If you're currently fully insured, request a full pharmacy claims report from your carrier or broker. If they can't provide it, that's telling. You should be able to see your total pharmacy spend, utilization by drug category, rebate amounts, and effective drug costs. If you have this data, we can benchmark it against market norms and identify the opportunity in our first meeting.
Year one in a self-funded plan is different from every year that followed in your fully insured plan. It's the year you build the infrastructure, establish the baselines, and start to understand your actual health economics. It's also the year most of the structural savings materialize. Here's what to expect — honestly.
A typical transition from fully insured to self-funded takes 90 to 120 days from engagement to go-live — timed to your plan's renewal date.
Most employers see the largest financial impact in three areas during year one: the elimination of the carrier's risk margin and profit load (typically 12–18% of premium), the pharmacy benefit restructuring (often 30–45% reduction in pharmacy spend through a transparent PBM and formulary optimization), and reduced administrative overhead through a direct TPA relationship that costs less than the carrier's bundled administration.
A typical 300-employee employer moving from a $1.5M fully insured premium to self-funding might see $200K–$350K in year-one savings. That's before any behavioral or plan design interventions, which typically compound the savings in years two and three.
Your monthly funding amount covers expected claims — but actual claims will fluctuate. Some months will come in below expectation, some above. That variability is normal, and it's exactly what stop-loss is designed to manage at the tail. We set up every client with a claims reserve — typically 60 to 90 days of expected claims — funded at inception. This smooths the cash flow profile and ensures you're never in a position where a spike in claims creates a liquidity issue.
By the end of year one, you should have a complete picture of your plan's economics: actual cost per member per month, claims by category, pharmacy utilization and cost, stop-loss attachment status, and a variance report comparing actual to projected. That data — which you never had in a fully insured plan — is the foundation for year two planning. It's also the moment when most clients realize they've fundamentally changed their relationship with their health benefit costs.
The benefits advisory market has a fundamental conflict of interest problem. Most brokers are compensated through commissions and placement fees paid by the carriers, TPAs, and PBMs they recommend. The more premium they place — and the more expensive the vendors they select — the more they earn. Their incentive is not to find you the best solution. It's to maximize placement revenue while keeping you as a client.
This isn't speculation. It's the architecture of the industry. And it means that the questions you ask a prospective advisor before engaging them are among the most important decisions in your benefits strategy.
Every answer we give to the questions above is the answer you're looking for. We charge a flat advisory fee. We accept no commissions. We operate in a fiduciary-like capacity — committed in writing to acting in your plan's best interest with full conflict disclosure. We produce comprehensive monthly reporting. We've told prospective clients self-funding wasn't right for them — and we'd do it again.
A 30-minute conversation with our team will tell you more about your specific opportunity than any guide we could write. No pressure, no commitment.
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