Funding Arrangement · Self-Funded

Self-funded health insurance:
stop paying 25% margin to a carrier you can't see into.

Self-funding flips the script: you pay claims as they happen, hire a TPA to administer the plan, buy stop-loss to cap catastrophic risk, and keep every dollar of surplus when claims come in favorable. For 100+ EE groups with stable claims and a CFO involved in the decision, self-funded is usually the most cost-effective option in the market.

This page is the long version. If you'd rather just model your numbers: jump to the Health Funding Projector →

Best fit100+ EEStable claims, sophisticated finance team
Typical savings15–30%vs. fully-insured at the same plan design
Surplus on good year100% yoursNot split with carrier
Worst case (1 yr)+15–25%Capped by aggregate stop-loss

The carrier-margin question self-funded answers most directly: "why am I paying 25-30% over actual claims to a carrier whose only contribution is bearing risk I'm sophisticated enough to bear myself?"

How self-funded actually works

You contract with a TPA (Third-Party Administrator) to process claims, manage the network, and handle ACA reporting. You buy stop-loss insurance from a reinsurer to cap your downside on catastrophic claims. You set your own plan design — what's covered, what the deductibles look like, which providers are in-network. Then you pay claims monthly as they come in.

The cash flow looks like this: each month, the TPA tells you what claims came in, you wire the funds. If a claim is over your specific stop-loss deductible (typically $250K-$500K per individual per year), the reinsurer reimburses you for the excess. At year-end, an actuarial reconciliation accounts for IBNR (Incurred But Not Reported) — claims that were incurred during the plan year but haven't been billed yet. The IBNR reserve is what trips up first-year self-funded employers.

If your group's actual claims come in 15% below expected, you keep the entire 15%. If claims come in 15% above expected but below the aggregate stop-loss attachment (usually 115-125% of expected), you pay the excess. If claims breach aggregate stop-loss, the reinsurer pays — but expect a meaningful renewal increase. Self-funding rewards stable, sophisticated buyers and punishes volatile, unsophisticated ones.

What you control vs. what you don't

The defining frame for any funding decision: who owns the risk, who owns the data, who owns the surplus, who owns the compliance burden. Level-funded sits in the middle of the spectrum — more control than fully-insured, less than self-funded.

Dimension Fully-Insured Level-Funded Self-Funded
Risk on bad yearCarrier (you pay fixed)Capped at 110-125% expectedYou bear it all to stop-loss
Surplus on good yearCarrier keeps it50/50 split or 100% return100% yours
Claims data accessLimited, delayedMonthly, full detailReal-time
Plan design flexibilityCarrier templatesCustomizable within carrier frameworkFully customizable
ERISA compliance burdenCarrier owns itShared (you're the plan sponsor)Fully on you
Cash flow predictabilityFixed monthlyFixed monthlyVariable claims-as-paid
Renewal volatility5-15% typical, up to 50%Smooths over multi-yearDriven by your data

What this looks like over five years for a 75-employee group

Same group, same demographics. Self-funded shows the steepest savings curve when claims stay stable — but is the highest-volatility option of the three.

$22k $20k $18k $16k $14k Yr 1 Yr 2 Yr 3 Yr 4 Yr 5 Fully-Insured Level-Funded Self-Funded

By year 5, self-funded is the lowest-cost path — assuming claims stay within 5-10% of expected. The volatility line on this chart is honest: self-funded years 2-3 wobble (the captive and level-funded lines look smoother). That's the trade. If your CFO can absorb $100K of monthly variance to capture $300K of annual savings, self-funded works.

Where BENEFITRA actually adds value on a self-funded plan

Anyone can sell you self-funded. Here's what we do that most brokers don't:

Worked example · 142-EE professional services firm in IL

What self-funded looks like in year 1 vs. year 3

Engineering firm, 142 enrolled employees, 4 years of clean claims history coming off a fully-insured plan that hit a 16% renewal. CFO involved in the decision; HR Director ready for the operational shift.

Prior fully-insured annual cost
$2,272,000
Year 1 self-funded run rate (claims + admin + stop-loss)
$1,710,000
Year 1 IBNR true-up (under-reserved by Q4)
+$58,000
Year 1 effective savings vs. prior year
$504,000 (22%)

Year 2 came in at $1,640,000 — additional 4% improvement once IBNR reserves were properly funded and care management identified two emerging high-cost cases. Year 3 ran $1,615,000. Three-year cumulative savings vs. an assumed 9% fully-insured renewal trend: $2.31M. The CFO's quarterly review now leads with claims-trend analysis instead of premium-renewal anxiety.

Model your own numbers

The Health Funding Projector compares fully-insured, level-funded, self-funded, and captive across a 5-year horizon based on your group's size, location, and claims history.

Run your projection

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How self-funded stacks against the other six

Self-Funded is one of seven funding paths Benefitra works with. Each has a sweet spot and an exit ramp. Pick the page that matters most for your situation:

Fully-Insured Level-Funded Self-Funded Captive ICHRA PEO-Integrated Taft-Hartley Compare all seven

Frequently asked questions about self-funded health insurance

What is IBNR liability and why does it matter at year-end on a self-funded plan?
IBNR stands for Incurred But Not Reported — it's the dollar amount of medical claims that occurred during your plan year but hadn't been billed to your TPA yet at year-end. A patient gets surgery on December 28; the hospital bills the TPA in March. That March bill is a Year-1 IBNR claim, even though it pays in Year-2's cash. At year-end, an actuary estimates your IBNR exposure (typically 8-15% of annual claims, depending on group size and seasonality). You owe that estimate as a reserve. First-year self-funded employers often under-reserve because they're matching cash to the prior fully-insured payment cadence — and get hit with a 6-figure true-up bill in Q2 of Year-2 when the IBNR claims actually pay. The fix: model IBNR before plan inception, fund the reserve in monthly bites during Year-1, true up at year-end.
How much cash reserve should a self-funded employer hold?
Conservative answer: enough to cover 30-60 days of expected claims plus your IBNR estimate. For a 100-EE group running $1.5M in annual claims, that's roughly $250K-$400K in dedicated reserve. The reserve isn't an expense — it's working capital you'd hold anyway against benefits costs. Most CFOs hold it in a separate operating account or line of credit. Stop-loss policies cap your catastrophic exposure but they don't help with month-to-month claims volatility — that's what the reserve absorbs. Groups that try to run self-funded on minimum cash get caught when one bad month produces a $200K+ wire to the TPA they weren't expecting.
What ERISA compliance requirements come with self-funding that I don't have on fully-insured?
On fully-insured, the carrier handles most ERISA compliance — they file the Form 5500, maintain plan documents, distribute Summary Plan Descriptions, manage the appeals process. On self-funded, the employer becomes the plan administrator and assumes all of those duties. The most material additions: drafting and maintaining the formal Plan Document (this isn't optional and creates fiduciary liability if missing), distributing the SPD to participants annually, filing Form 5500 if you have 100+ participants, ACA reporting on the actual self-insured plan, COBRA administration, and HIPAA privacy compliance for claims data. Most self-funded employers outsource the compliance burden to their TPA or a benefits consultant — but the legal liability stays with the employer.
When does self-funding actually save 25%, and when does it save 5% or nothing?
Self-funding saves the most when three conditions align: your group is large enough (100+ EE) that monthly claims volatility smooths out, your claims history is stable (within 5% of expected for the prior 24 months), and you stay self-funded long enough to capture multi-year compounding (3+ years). In that profile, 20-30% savings vs. fully-insured is realistic. The savings shrink to 8-15% if any of those conditions weakens — smaller group, higher volatility, shorter time horizon. The savings can disappear or go negative if your group has a chronic high-claim pattern or if you bind stop-loss with a carrier that lasers aggressively at renewal. The honest version: the savings are real but conditional. If you're not stable, captive or level-funded usually beats pure self-funding.
What's the difference between a TPA and a stop-loss carrier?
A TPA (Third-Party Administrator) processes your claims, manages the provider network, handles enrollment and member services, and produces your monthly claims reports. The TPA is operational — they're who your employees interact with when they have a claim question. A stop-loss carrier is the reinsurer that protects you from catastrophic claims; they don't process claims, they reimburse you when claims exceed your specific or aggregate deductible. Most self-funded employers contract with both — typically the TPA is bundled with a network (Cigna, Aetna, BCBS often play both roles via their ASO/Administrative Services Only product), and stop-loss is purchased separately from a specialty reinsurer. The two contracts have different renewal cycles, different risk dynamics, and need to be managed as separate negotiations.
Can I switch back to fully-insured if self-funding doesn't work out?
Yes, and many groups have. The mechanics: at your plan-year renewal, terminate the self-funded plan and bind a fully-insured plan effective the same day. The complexity is run-out — claims that were incurred during the self-funded period but bill afterward. You're still responsible for those, even after the fully-insured plan starts. Most employers buy 12 months of run-out claims administration from their outgoing TPA as part of the wind-down. Stop-loss policies often have run-out provisions that extend protection to those late-billing claims. Reverting is usually a sign that something didn't work — high claims, compliance burden, cash-flow stress — but it's not a one-way door. Plan to capture lessons learned for next time.
What is reference-based pricing (RBP), and what's the balance-billing risk?
Reference-based pricing is a self-funded plan design that pays providers a fixed percentage of Medicare's reimbursement rate (typically 140-180%) instead of using a negotiated network. Done right, it cuts claims costs 20-30% — providers can't bill the inflated commercial rates, the plan only pays the Medicare-anchored amount. The risk: balance billing. A provider can bill the patient for the difference between what they charged ($10,000) and what the plan paid ($1,800) — leaving the employee with an $8,200 surprise bill. Modern RBP administrators (Imagine360, ELAP, others) include legal advocacy: they'll defend members against balance bills, negotiate down the disputed amount, and absorb the risk if litigation results. RBP works when you have a sophisticated administrator with strong member-advocacy infrastructure; it fails badly without one. Don't pick RBP for the cost savings alone — pick it because the administrator has the legal resources to handle the inevitable disputes.

Want a self-funded model grounded in your actual claims data?

Send us your last 24 months of claims experience and we'll model self-funded vs. captive vs. level-funded across a 5-year horizon — including the IBNR liability, reserve requirement, and stop-loss carrier comparison most brokers gloss over.

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