Self-Funded Employer Health Plans & Stop-Loss Insurance: The CFO and HR Director's Practical Playbook

Disclaimer: This article is general informational content prepared for educational purposes only. It is not insurance advice, legal counsel, or tax guidance. Self-funded health plan decisions involve significant financial and regulatory complexity. Before making any changes to your employee health benefits, consult a licensed benefits broker, a stop-loss specialist, and qualified ERISA counsel.

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Why Are 67% of US Covered Workers Already in Self-Funded Plans?

The number stops HR directors cold the first time they hear it: 67% of all covered US workers are enrolled in self-funded employer health plans, according to the KFF 2025 Employer Health Benefits Survey. That majority isn’t happening by accident. It reflects a rational economic calculation that more and more employers — including mid-size manufacturers, regional professional services firms, and growing tech companies — have been running for themselves.

Among large employers (200+ employees), the penetration is even higher: 80% of covered workers are in self-funded arrangements. Even in the small-employer segment (10–199 employees), 27% of covered workers are now self-funded, with another wave choosing level-funded plans as a lower-volatility on-ramp.

The reason is straightforward: in a fully insured plan, you are paying the insurance carrier for something — risk transfer — that, in a good claims year, you never needed. The carrier’s gross margin, state premium taxes, risk charges, and profit load are all bundled into your monthly premium. When your group has a healthy year, that money is gone. In a self-funded plan, if your group is healthier than expected, the savings belong to the plan — and by extension, to the employer and employees.

That said, self-funding is not a blanket upgrade. The mechanics matter enormously. Get the stop-loss structure wrong, misread a contract basis, or ignore ERISA obligations, and you can turn a profitable move into a cash-flow crisis. This playbook covers the mechanics in the level of detail that actually helps a CFO approve the decision or a benefits broker defend it to a skeptical board.

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How Does Self-Funding Actually Work Month to Month? (Cash Flow Mechanics)

In a fully insured plan, cash flow is simple: you write one check per month to the carrier. The carrier pays claims. You never see individual claim data (or rarely, in aggregated form). Your risk ends at the premium invoice.

Self-funding inverts this. The employer becomes the plan — technically, an ERISA plan sponsor — and the claims liability sits on your balance sheet until paid.

The monthly flow looks like this:

1. Claims Reserve Account. The employer funds a dedicated bank account (often a trust account or a segregated claims fund) each month to cover anticipated paid claims. This is not premium — it is a cash reserve against actual claims obligations.

2. Stop-Loss Premium. Separately, the employer pays a monthly premium to a stop-loss carrier for specific and aggregate coverage. This is a real insurance premium, and unlike claims reserves, it does not come back if claims are low.

3. TPA/ASO Administrative Fee. A third-party administrator (TPA) or administrative services only (ASO) arrangement with a carrier processes claims, manages eligibility, provides a provider network, and issues EOBs. They charge a per-employee-per-month (PEPM) fee.

4. Claims Are Paid. When an employee or dependent incurs a claim, the provider submits it to the TPA. The TPA adjudicates (determines coverage and allowable amount), and the claim is paid from the claims reserve account. The employer sees every significant claim — this visibility is one of self-funding’s underappreciated strategic advantages.

5. Stop-Loss Reimbursement. When a specific claim crosses the attachment point, the employer files for reimbursement from the stop-loss carrier. Timing depends on the contract basis (more on that below).

6. Year-End True-Up. The claims reserve account is reconciled. Surplus funds roll forward or are returned to the employer’s operating account, depending on plan structure.

The key discipline: you need sufficient liquid reserves to absorb claims before stop-loss reimbursement arrives. Stop-loss carriers don’t pay instantly — reimbursement lag can run 30–60 days from claim payment. A company that self-funds without adequate working capital discovers this the hard way in Q1 when January claims are high and reimbursements haven’t landed yet.

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Specific Stop-Loss: Your Per-Person Catastrophe Shield

Specific stop-loss (also called individual stop-loss) is the primary catastrophe protection in any self-funded plan. It operates at the member level.

How it works: You choose a specific deductible — also called the specific attachment point. For small-to-mid employers (roughly 50–500 employees), this typically ranges from $30,000 to $100,000 per member per year. For any single covered member whose claims exceed that attachment point during the plan year, the stop-loss carrier pays the excess dollar amount up to the policy limit.

If your specific deductible is $50,000 and an employee undergoes cancer treatment generating $300,000 in claims, you pay the first $50,000 and the stop-loss carrier pays the remaining $250,000 (assuming no per-occurrence or lifetime limits in the stop-loss policy — confirm this with your broker).

Setting the right attachment point involves two competing forces:

• Lower attachment point = lower employer risk per person, but higher stop-loss premium. More protection on each claim.
• Higher attachment point = lower premium, but the employer absorbs more of each large claim. Makes sense only if the group has adequate reserves and claims history to justify the higher retention.

Most mid-size employers in the 75–200 employee range land at a $50,000–$75,000 specific deductible as a starting point. The right number is actuarially derived from your group’s demographics, industry risk, historical claims data, and the CFO’s risk tolerance — not from a broker’s gut feeling.

Illustrative Example — not actual quotes:

Scenario 1: A 75-employee manufacturing firm sets its specific deductible at $50,000. Expected claims per employee per month (PEPM) are $650, so the annual expected claims pool is approximately $585,000 (75 × $650 × 12). The employer funds roughly $48,750/month into the claims reserve. Stop-loss premium adds approximately $120 PEPM ($9,000/month). TPA fees run $35 PEPM ($2,625/month). Total monthly cost: approximately $60,375.

Midyear, one employee is diagnosed with an aggressive lymphoma. Chemotherapy, hospitalization, and specialty drug costs total $200,000 by December 31. The employer pays the first $50,000 from the claims reserve. The stop-loss carrier reimburses $150,000 — the amount above the $50,000 attachment point. Net employer exposure on that single claim: $50,000, not $200,000.

Without stop-loss, that $200,000 claim would have consumed the entire claims reserve and required an emergency cash injection to cover other member claims. Stop-loss didn’t just protect the employer financially — it made self-funding viable for a 75-life group.

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Aggregate Stop-Loss: Protection When Everyone Gets Sick at Once

Specific stop-loss handles the single-member catastrophe. Aggregate stop-loss handles the scenario where no single claim is catastrophically large, but a dozen employees all have surgery, two have high-risk pregnancies, and three others have significant chronic disease management needs — and the cumulative claims blow past your annual budget.

How it works: The aggregate attachment point is calculated as a percentage of expected paid claims for the year — typically 120% to 125% of expected claims. If total plan-year paid claims across all members exceed that threshold, the aggregate stop-loss carrier reimburses the excess above the attachment point.

The aggregate corridor — the gap between 100% and 120–125% of expected — is the employer’s retained risk. You absorb claims variation up to 20–25% above expectation before aggregate kicks in. That corridor is intentional: it prevents the stop-loss carrier from paying routine annual variation and keeps premiums manageable.

Important mechanics:

• Aggregate stop-loss is typically settled at plan year-end, not monthly. Reimbursement comes after final claims runout, which can take months after the plan year closes.
• Many stop-loss carriers offer an aggregate accommodation or monthly aggregate — a feature that advances funds if the running total suggests the aggregate threshold will be hit by year-end. This can be a critical cash-flow tool. Ask for it.
• The aggregate attachment point is calculated using a corridor factor applied to the employer’s specific deductible and census. Your broker should show you the full aggregate corridor calculation, not just the attachment dollar amount.

Table 2: Specific vs Aggregate Stop-Loss Comparison

Feature	Specific Stop-Loss	Aggregate Stop-Loss
Trigger	Single member’s claims exceed attachment point	Total plan claims exceed % of expected
Attachment point	Per-member per-year (e.g., $50,000)	120%–125% of expected paid claims
Payout timing	As each qualifying claim is reimbursed	Typically at/after plan year-end
Primary protection against	Catastrophic single-member claims	Adverse aggregate claims experience
Premium cost (relative)	Higher share of total stop-loss cost	Lower share of total stop-loss cost
Availability without the other	Rarely — usually purchased together	Rarely — usually purchased together
Monthly accommodation available?	N/A	Yes, from most carriers (ask)

For most employers, both coverages are purchased together from the same stop-loss carrier. Separating them (buying specific from one carrier and aggregate from another) can create coverage gaps and disputes over claim counting. Keep them with one carrier.

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Setting the Attachment Point: The Risk-vs-Premium Trade-Off

This is where self-funding decisions get real. The attachment point is not just a number on a quote sheet — it defines your retained financial exposure and directly determines your monthly stop-loss premium.

The actuarial framework:

Stop-loss underwriters price specific coverage using:

• Group size (statistical credibility of claims data)
• Industry and risk profile (manufacturing has higher injury and occupational disease rates than office-based professional services)
• Historical claims data (usually 2–3 years; carriers weight the most recent year heavily)
• Plan design (richer benefits = higher expected claims)
• Member demographics (age, gender, family composition)
• Known high-cost claimants (see Lasering section)

A rough rule of thumb for illustrative purposes: Moving the specific deductible from $50,000 to $75,000 may reduce your specific stop-loss premium by 20–35%, but exposes you to an additional $25,000 per large claim. Whether that trade makes sense depends on your claims history. If your group has had zero specific claims above $30,000 in three years, raising the attachment point to $75,000 and pocketing the premium savings is defensible. If you had two $80,000 claims last year, a $50,000 deductible may not even be adequate.

Table 3: 75-Employee Illustrative Monthly Budget

(Illustrative Example — not actual quotes)

Component	PEPM Rate	Monthly Cost (75 employees)
Claims fund (expected paid claims)	$650	$48,750
Specific stop-loss premium	$90	$6,750
Aggregate stop-loss premium	$30	$2,250
TPA/ASO administrative fee	$35	$2,625
Network access fee	$15	$1,125
Utilization management	$10	$750
Total monthly cost	$830	$62,250
Equivalent fully-insured estimate	~$950–$1,050	~$71,250–$78,750

The difference of $120–$220 PEPM represents the employer’s retained risk and potential savings. In a good claims year, some or most of the claims fund surplus is returned. In a bad year, the total can exceed the fully-insured equivalent — but specific and aggregate stop-loss limit how far above budget you can go.

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Lasering: What It Is, When Carriers Do It, and How to Push Back

Lasering is the stop-loss underwriting practice that generates the most confusion — and the most frustration — among HR directors who encounter it for the first time at renewal.

Definition: When a stop-loss carrier identifies a covered member with a known or anticipated high-cost condition, it may assign a laser to that individual: a higher specific attachment point that applies only to that person. The rest of the group retains the standard attachment point; the lasered individual has a higher threshold before stop-loss kicks in.

Why carriers laser: The carrier’s underwriting model prices the group’s aggregate risk. A member who is mid-treatment for end-stage renal disease, scheduled for a liver transplant, or receiving an ongoing biologic medication will generate predictable, high-magnitude claims. If the carrier reimbursed those claims at the standard $50,000 attachment point, it would price the stop-loss premium unsustainably high for the group — or decline to offer coverage. Lasering allows the carrier to write the group while adjusting for known risk.

Common conditions that trigger lasering:

• End-stage renal disease (ESRD) / dialysis
• Active cancer treatment (oncology, specialty drugs)
• Scheduled organ transplants
• Hemophilia and other high-cost chronic blood disorders
• Ongoing high-cost biologic medications (e.g., for Crohn’s, RA, multiple sclerosis)
• Premature infants in NICU (known at renewal if the pregnancy is ongoing)

Illustrative Example — not actual quotes:

Scenario 2: A 120-employee professional services firm has one employee with end-stage renal disease receiving dialysis three times per week. The standard specific deductible for the group is $50,000 per member per year. The stop-loss carrier identifies the dialysis patient as a known high-cost claimant and assigns a laser of $150,000 — meaning the plan must pay the first $150,000 of this individual’s claims before stop-loss reimburses.

Annual dialysis costs (facility, physician, medications) for this employee run approximately $125,000. Under the laser, the employer absorbs all $125,000 — the claims never even cross the $150,000 laser threshold. Without the laser, the employer would have absorbed only $50,000 and received approximately $75,000 in stop-loss reimbursement.

The employer’s out-of-pocket difference: $75,000 more per year due to the laser.

The employer requested a no-laser rider at the prior year’s renewal. The carrier offered it for an additional $45 PEPM — roughly $64,800 per year for 120 employees. The CFO declined. In hindsight, the no-laser rider would have cost $64,800 to save $75,000 in excess claims liability — a marginal positive but with future year risk protection as well. The calculation changes if the employee’s condition improves or worsens.

How to push back on lasers:

1. No-laser rider. Many stop-loss carriers offer a no-laser endorsement for additional premium — typically meaningful PEPM cost but potentially worth it if you have a known high-cost claimant. Request a quote with and without the no-laser rider at every RFP cycle.

2. Negotiate the laser amount. The laser is not always take-it-or-leave-it. A well-capitalized broker with strong carrier relationships can negotiate the laser threshold down, particularly if the group has strong overall claims experience otherwise.

3. Compare carriers. Stop-loss markets vary in their lasering aggressiveness. Some carriers laser more readily; others build the risk into higher aggregate premiums and offer cleaner specific coverage. Running a true market RFP (5–7 carriers minimum) gives you leverage.

4. Consider carve-out programs. For ESRD specifically, some stop-loss structures coordinate with Medicare ESRD eligibility rules (most ESRD patients become Medicare-eligible after 33 months). Your TPA and broker can model when Medicare becomes primary, reducing the employer’s long-term exposure.

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Reading Your Stop-Loss Contract: 12/12 vs 12/15, Run-In, Run-Out, and Contract Basis

The contract basis is one of the most consequential — and most frequently misread — elements of a stop-loss policy. Get it wrong and you can find yourself holding a large claim that technically happened in your plan year but falls outside your coverage window.

The three most common contract bases:

12/12: Claims must be both incurred (the medical service occurred) and paid (the claim was processed and paid) within the same 12-month plan year. Tight. A claim incurred in December but paid in January of the following year is not covered. This basis is cheapest for the carrier and least protective for the employer.

12/15: Claims must be incurred within the 12-month plan year but may be paid within 15 months — a 3-month run-out window after the plan year closes. This is the most common basis in mid-market self-funded plans and the one your broker should default to recommending. It captures the routine billing lag between service and payment.

12/18: Same logic but with an 18-month run-out window. More protective, higher premium. Most common for plans with complex benefit structures or specialty care where billing lag is longer (transplant centers, out-of-network facilities).

Run-in (also called “paid-in” or “prior acts”): When transitioning from a fully insured plan or from a different stop-loss carrier, there will be claims from the prior period that are incurred before the new contract effective date but paid after. The run-in provision determines whether the new stop-loss carrier covers those claims. Without adequate run-in coverage, the transition gap can be costly.

Run-out: When leaving a self-funded arrangement (moving back to fully insured, being acquired, or closing the plan), claims incurred during the self-funded period but paid afterward must be covered somehow. This can be handled through:

• A run-out contract extension from the existing stop-loss carrier
• Tail coverage purchased separately
• A claims run-out reserve held by the employer

At every renewal, confirm your contract basis in writing. A 12/12 contract sold as a 12/15 without explicit documentation is a coverage dispute waiting to happen.

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TPA vs ASO: Who Actually Runs Your Plan and What Do They Cost?

When you self-fund, someone still has to adjudicate claims, manage eligibility, issue member ID cards, answer member calls, and produce the reporting your CFO and stop-loss carrier need. That entity is either a TPA or an ASO.

TPA (Third-Party Administrator): An independent company that provides plan administration services on a contract basis. TPAs are typically not insurance carriers. They charge a PEPM administrative fee that covers claims adjudication, eligibility management, member services, EOB generation, and reporting. Many TPAs have proprietary or leased provider network arrangements.

ASO (Administrative Services Only): Functionally similar to a TPA, but the administrator is a licensed insurance carrier operating in a purely administrative capacity for the self-funded plan. The employer retains claims risk; the carrier provides only services. Blue Cross Blue Shield plans, Cigna, Aetna, and UnitedHealthcare all offer ASO arrangements.

Key distinction: An ASO typically gives you access to the carrier’s national proprietary network — which can be a significant cost advantage in claims repricing. A TPA typically accesses networks through rental agreements (e.g., Multiplan, First Health, PHCS, or regional Blue Card access). For employers with employees in many states, the carrier network breadth of an ASO can be meaningfully better.

Table 6: TPA/ASO Evaluation Scorecard

Evaluation Criterion	What to Ask	TPA Consideration	ASO Consideration
Network breadth	Which networks are included?	Rented/leased; varies by region	Proprietary + rental; usually broader
Claims adjudication speed	Average days to finalize claim?	Varies widely (5–21 days typical)	Typically faster; carrier infrastructure
Reporting transparency	Can we see real-time claim data?	Often more flexible/custom	Standardized reports; may limit custom
Stop-loss coordination	Do they work with our carrier?	Often works with multiple carriers	May prefer affiliated stop-loss
PEPM cost	All-in fee including ancillaries?	Often lower base PEPM	Higher base; may include more services
Reference checks	Can we call 3 current clients?	Essential pre-decision	Essential pre-decision
Contract termination	What are the off-boarding terms?	Check 90–180 day notice clauses	Check data portability terms
Pharmacy carve-out compatibility	Can we use an independent PBM?	Usually yes	Carrier may prefer own PBM

For a 75-employee manufacturing firm, a regional TPA with strong local network access and flexible reporting often outperforms an ASO on cost and service responsiveness. For a 300-employee professional services firm with employees in 15 states, an ASO’s national network footprint often justifies the premium.

What the PEPM actually covers (and what it doesn’t):

Standard TPA PEPM fees typically cover: medical claims adjudication, eligibility, member services, EOB production, and standard reporting. They often do not cover: utilization management (billed separately), disease management programs, pharmacy benefits management (PBM, almost always a separate contract), stop-loss coordination fees, and COBRA administration.

Model the all-in administrative cost, not just the headline PEPM. The difference between a $30 PEPM and a $55 PEPM often disappears when you add back the ancillary services.

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ERISA Preemption: The Federal Umbrella That Overrides State Insurance Mandates

ERISA — the Employee Retirement Income Security Act of 1974 — is the federal law that governs employer-sponsored benefit plans. For self-funded health plans, ERISA’s preemption clause (Section 514) is one of the most financially significant advantages available to employers.

What ERISA preemption does: ERISA preempts state laws that “relate to” employee benefit plans. For self-funded health plans specifically, this means state insurance mandates — requirements that insurance carriers must cover certain services, treatments, or procedures under policies they issue in the state — do not apply.

In practical terms: if your state mandates that all health insurance policies cover in vitro fertilization, acupuncture, autism spectrum disorder services beyond a certain level, or specific mental health parity requirements that exceed federal law, your self-funded plan is not legally required to include those benefits. You may choose to include them — and many employers do for competitive recruiting reasons — but ERISA gives you the choice.

This is not a loophole. It is Congress’s deliberate policy choice to allow national employers to maintain uniform benefit plans across state lines without having to comply with 50 different benefit mandate regimes. A self-funded manufacturer with plants in Ohio, Texas, and California can offer the same plan in all three states, which is administratively and financially practical. Under fully insured plans subject to state regulation, that manufacturer might face materially different benefit requirements in each state.

States with significant benefit mandates (common examples):

Several states have enacted extensive benefit mandates that fully insured plans must comply with but self-funded plans are not required to follow. Examples include mandates covering: fertility treatments, gender-affirming care, specific cancer screenings, step therapy overrides, and substance use disorder services beyond the federal parity floor. The specific mandates vary by state and change regularly; your ERISA counsel and broker should audit the relevant states annually.

What ERISA preemption does NOT do:

ERISA preemption does not exempt self-funded plans from federal law. That distinction matters enormously — see the next section.

ERISA compliance obligations that self-funded plans must meet:

Self-funding triggers meaningful compliance obligations that fully insured employers mostly avoid (because the carrier handles them).

Table 5: ERISA Compliance Checklist for Self-Funded Plans

Obligation	Requirement	Deadline / Frequency
Plan Document	Written document governing plan terms; must be updated for plan changes	Before plan effective date; update within 60–90 days of material change
Summary Plan Description (SPD)	Plain-language summary distributed to all participants	Within 90 days of becoming a participant; updated SPD every 5 years if changes, 10 years if no changes
Summary of Benefits and Coverage (SBC)	Standardized ACA-required 4-page summary	Provided at open enrollment and upon request
Form 5500	Annual DOL filing (financial, participation, and fund data)	7 months after plan year-end; 2.5-month extension available
Audited Financial Statements	Required for plans with 100+ participants at start of plan year	Filed with Form 5500
COBRA Administration	Continuation coverage notices and administration	14 days from qualifying event notification to plan
HIPAA Privacy and Security	Business Associate Agreements with TPA, PBM, others; PHI protection	Ongoing; breach notification within 60 days
Mental Health Parity (MHPAEA)	Federal parity required; nonquantitative treatment limitation (NQTL) analysis mandatory	Ongoing; DOL may request NQTL documentation
Comparative Analysis (NQTL)	Written analysis of mental health/SUD vs medical/surgical benefit parity	Available upon participant or DOL request
No Surprises Act	Independent dispute resolution for out-of-network emergency claims; advance EOBs	Applicable for plan years starting January 1, 2022 and after

Most employers engage ERISA counsel to draft the initial Plan Document and update it annually. This is not optional. An ERISA plan without a written Plan Document is both a DOL enforcement risk and a plan governance problem when member disputes arise.

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ACA Rules That Still Apply to Self-Funded Plans (Don’t Get This Wrong)

ERISA preemption creates a common misconception: that self-funded employers get to design whatever plan they want. That is wrong. The Affordable Care Act imposed federal requirements that apply to virtually all employer-sponsored health plans — including self-funded plans.

ACA requirements that apply to self-funded plans:

1. No lifetime or annual dollar limits on essential health benefits. You cannot cap a member’s cardiac care, cancer treatment, or specialty drug coverage at $1 million. Unlimited lifetime maximum is required. Self-funded plans can still impose limits on non-essential benefits, but the ACA’s protected essential categories must be covered without a dollar cap.

2. Dependent coverage to age 26. Adult children must be offered coverage through age 26, regardless of dependency, marital status, or student status.

3. No pre-existing condition exclusions. Self-funded plans cannot deny coverage, impose waiting periods, or charge higher premiums based on a member’s health history. (This is separate from lasering, which is a stop-loss carrier adjustment, not a plan design exclusion. The employee is still covered by the plan; the employer just absorbs more stop-loss risk on that individual.)

4. Preventive care at no cost-sharing. ACA-required preventive services (as defined by the USPSTF, ACIP, and HRSA) must be covered at 100% — no copay, no deductible. This includes colonoscopies, mammograms, blood pressure screening, well-child visits, and many vaccinations. Note: the specific list of required preventive services has been subject to ongoing litigation; confirm current requirements with ERISA counsel.

5. Mental health and substance use disorder parity (MHPAEA). Federal parity law requires that mental health and substance use disorder benefits be no more restrictive than medical and surgical benefits. This applies to both quantitative limits (day limits, visit limits) and nonquantitative treatment limitations (prior authorization requirements, fail-first protocols). DOL enforcement of NQTL analysis requirements has increased significantly.

6. No rescissions except for fraud or intentional misrepresentation. A plan cannot cancel a member’s coverage retroactively because they got sick, unless they committed fraud on their enrollment.

What self-funded plans do NOT have to cover:

Self-funded plans do not have to comply with state essential health benefit (EHB) mandates. This is the practical expression of ERISA preemption. States define their EHB benchmarks, which fully insured plans in that state must cover. Self-funded plans are exempt from those state EHB definitions — though they must still comply with the federal ACA provisions listed above.

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Level-Funded Plans: The Right On-Ramp for Employers Under 150 Lives

For a healthy 50-life group with good claims history, level-funded is almost always the right first step before committing to full self-funding. That is a position, not a hedge.

Level-funded plans have grown dramatically in the small-employer market. According to the KFF 2025 Employer Health Benefits Survey, 37% of small-firm covered workers are now in level-funded plans, up from just 7% in 2019. That is not a coincidence — it reflects the insurance market recognizing that employers want the economics of self-funding without the cash-flow volatility.

How level-funded works:

The employer pays a fixed monthly amount, which has three components:

1. Claims fund contribution — money set aside to pay anticipated claims
2. Stop-loss premium — specific and aggregate coverage already embedded
3. Administrative fee — TPA/ASO PEPM, network access, etc.

The employer pays the same amount every month regardless of actual claims. At year-end:

• If actual claims are below the funded amount, the employer receives a refund of the surplus claims fund balance (stop-loss premium and admin fees are not refunded).
• If actual claims are above the funded amount but below the aggregate attachment point, the claims fund surplus offsets the overage.
• If claims exceed the aggregate attachment point, stop-loss reimburses the employer.

Illustrative Example — not actual quotes:

Scenario 3: A 50-employee accounting firm switches from a fully insured plan to a level-funded arrangement. The carrier structures a monthly fixed payment of $58,000: $40,000 to the claims fund, $12,000 for stop-loss premium, and $6,000 for administrative fees.

At year-end, the firm’s total annual claims come in at $408,000 — 15% below the $480,000 funded amount. The claims fund has a $72,000 surplus.

The carrier refunds 80% of the surplus to the employer (many level-funded contracts retain 20% as administrative/risk buffer). The employer receives a $57,600 refund.

Net annual cost: $696,000 paid – $57,600 refund = $638,400. Per employee per year: $12,768. Compared to a hypothetical fully insured equivalent of approximately $14,000–$15,500 PEPY for similar benefits.

The employer also gains access to their claims data for the first time, enabling year-two plan design adjustments targeting the top utilization categories.

The refund percentage varies significantly by carrier and plan design — anywhere from 50% to 100% of surplus claims funds may be refundable. This is a negotiable term. The higher the refund percentage, the higher the stop-loss premium (because the carrier is absorbing more risk). Model both scenarios before choosing.

Who should consider level-funded:

• Employers with 25–150 employees
• Groups with 2+ years of favorable claims history
• Employers who want claims data visibility
• Organizations preparing to eventually move to full self-funding

Who should not start with level-funded:

• Groups with high-cost known claimants who may get lasered
• Organizations where cash flow for potential deficit payments would be strained
• Employers who have had a catastrophic claims year in the past 24 months (the carrier will price this in)

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Fully Insured vs Level-Funded vs Self-Funded: A Structured Comparison

Table 1: Fully Insured vs Level-Funded vs Self-Funded

Feature	Fully Insured	Level-Funded	Self-Funded
Who bears claims risk	Insurance carrier	Carrier (stop-loss) + employer	Employer (stop-loss caps exposure)
Monthly cost predictability	Fixed premium; no variation	Fixed monthly payment	Variable (claims + fixed admin + stop-loss)
Claims surplus retained by	Carrier	Employer (partial refund at year-end)	Employer
Claims data visibility	Minimal (aggregated)	Yes (full claim-level data)	Yes (full claim-level data)
ERISA preemption	No	Yes (self-funded structure)	Yes
State insurance mandates	Must comply	Exempt (ERISA)	Exempt (ERISA)
ACA requirements	Fully apply	Fully apply	Fully apply
Stop-loss insurance	Embedded (you’re the policy)	Embedded in monthly payment	Purchased separately
Year-end refund possible	No	Yes (if claims under budget)	Yes (surplus reserves returned)
Working capital required	Minimal	Modest	Significant
ERISA compliance burden	Lower (carrier handles)	Higher (employer is plan sponsor)	Highest (full ERISA obligations)
Ideal employer size	Any, but costly for healthy groups	25–150 employees	100+ employees preferred
Laser risk	None (carrier takes all risk)	Yes (at renewal)	Yes (at renewal)

The transition from fully insured to level-funded to self-funded is not a one-way escalator — some employers move back toward level-funded after a catastrophic claims year. The right structure depends on your group’s size, health status, claims history, cash reserves, and administrative capacity.

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When Self-Funding Is the Wrong Call

Self-funding is not universally better than fully insured. There are specific circumstances where it is the wrong financial decision, and being honest about them is more useful than selling self-funding as the inevitable evolution.

When to stay fully insured (or move back):

Your group is too small. Below 50 employees, claims experience is statistically too volatile to be predictable. A single NICU baby or transplant patient in a 40-life group can represent 25–30% of your entire expected claims pool. Stop-loss helps, but the premium for adequate protection at that size often erodes most of the theoretical savings.

You have several known high-cost claimants. If your group has two dialysis patients, an active cancer case, and a member on a high-cost biologic medication, every carrier will either laser aggressively or decline to quote. The effective stop-loss cost may exceed what you would pay in a fully insured arrangement.

Your cash position cannot absorb claim volatility. Self-funding requires maintaining adequate claims reserves plus the ability to fund claims before stop-loss reimbursement arrives. A company with tight working capital that gets hit with a $400,000 first-quarter claims month can face genuine operational stress.

You lack the administrative capacity. Self-funding requires active engagement with TPA reporting, stop-loss claim filing, ERISA compliance calendar management, and annual plan document maintenance. Small HR departments that are already stretched often underestimate this overhead.

Your workforce is high-risk. Certain industries — long-haul trucking, mining, some manufacturing sectors — have demonstrably higher injury and illness rates. If your loss history reflects that, fully insured may be the right long-term structure regardless of group size.

You are growing rapidly. A company that expects to add 50 employees in the next 12 months is adding unknown health risk. Until the new cohort’s health status is established, the statistical unpredictability of a growing group argues for caution.

The right test: have a benefits actuary or an experienced stop-loss broker model three-year projected costs under both structures using your actual census and claims history. The numbers should drive the decision, not ideology about self-funding being inherently superior.

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The Transition Playbook: Steps to Move from Fully Insured to Self-Funded

If the analysis supports moving to self-funding (or level-funding as a first step), execution matters as much as the decision. Here is the sequence that experienced benefits consultants follow.

Step 1: Gather your historical data (months 6–12 before target effective date)

Request the following from your current fully insured carrier:

• 24–36 months of paid claims experience (monthly)
• Large claim detail for any claim above $15,000
• Member-level utilization report (de-identified if necessary)
• Current plan enrollment by tier (employee only, employee + spouse, family)

Many carriers are reluctant to provide this data. You are entitled to your plan’s experience data; your broker should facilitate the request. Without it, a stop-loss quote will be based solely on your census demographics, which means the carrier prices conservatively (against you).

Step 2: Engage an experienced stop-loss broker (month 5–6 before effective date)

Stop-loss is a specialty market. Not all benefits brokers are equipped to structure and market a stop-loss program effectively. Look for brokers with:

• Documented access to 8–12+ stop-loss carriers
• Experience with your industry and group size
• Ability to provide actuarial modeling, not just quote sheets
• References from comparable clients who transitioned from fully insured

Step 3: Select your TPA or ASO (concurrent with stop-loss selection)

Issue an RFP to at least three TPA/ASO candidates. Evaluate network adequacy for your employee geography, reporting capabilities, references, and all-in administrative cost. Do not select a TPA and then try to find stop-loss — many stop-loss carriers have preferred TPA relationships, and some will not write coverage with certain TPAs.

Step 4: Design your plan (month 4–5 before effective date)

Work with your broker and TPA to design the plan document. Key decisions:

• Deductible, out-of-pocket maximum, coinsurance structure
• Network tier design (single network, tiered network, reference-based pricing)
• Pharmacy benefit structure (carve-out PBM vs carrier integrated)
• Mental health parity compliance strategy
• Specific and aggregate stop-loss attachment points

Step 5: Engage ERISA counsel (month 4 before effective date)

Draft (or have drafted) your Plan Document and SPD. These are legal documents. Boilerplate TPA templates may not reflect your actual plan design and can create coverage dispute exposure. Budget $2,000–$8,000 for initial document preparation depending on plan complexity.

Step 6: Establish your claims reserve account (month 1–2 before effective date)

Work with your CFO to establish adequate reserves. A common starting point: fund the claims account to 2–3 months of expected claims before the plan effective date. This cushion covers early-year claim volatility before the plan reaches steady-state monthly funding.

Step 7: Communicate with employees (month 2 before effective date)

From the employee’s perspective, the plan design may change, but the administration experience (ID cards, network access, customer service) should be seamless. If you are switching networks, communicate the change explicitly with enough lead time for employees to confirm their providers are in-network. Nothing damages employee trust in a new plan faster than unexpected out-of-network billing on the first day.

Step 8: Monitor actively in year one

Pull monthly claims reports from your TPA. Review:

• Actual vs expected paid claims by month
• Large claims approaching specific attachment point
• Running aggregate accumulation vs attachment threshold
• Any pending high-cost cases that may require stop-loss filing coordination

Self-funding requires active financial management. The employers who treat it as a set-and-forget arrangement get unpleasant surprises at renewal.

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For further reading on related risk financing structures, see our guides on captive insurance company formation, directors and officers liability insurance, cyber liability insurance for SMBs, errors and omissions coverage, business liability insurance cost benchmarks, high-net-worth umbrella policies, business overhead expense insurance, and commercial auto coverage.

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Disclaimer (repeated for emphasis): Nothing in this article constitutes insurance advice, legal advice, ERISA counsel, or tax guidance. Statistics cited from the KFF 2025 Employer Health Benefits Survey are used for informational context only. Illustrative financial scenarios are constructed for educational purposes and do not represent actual quotes, carrier commitments, or guaranteed outcomes. Every employer’s situation is materially different. Consult a licensed benefits broker, a stop-loss specialist, and qualified ERISA counsel before making decisions about your employee health plan structure.