ACA and Self-Funded Plan Design

Self-funded (self-insured) health plans occupy a distinct regulatory position under the Affordable Care Act, carrying some ACA obligations while remaining exempt from others that apply to fully insured arrangements. Understanding which ACA requirements attach to self-funded plans — and which do not — is essential for employers structuring benefits programs outside the commercial insurance market. This page covers the definition and regulatory scope of self-funded plans under the ACA, the mechanics of how those plans operate, common employer scenarios, and the decision boundaries that separate self-funded from fully insured compliance obligations.

Definition and scope

A self-funded health plan is one in which the plan sponsor — typically an employer — assumes direct financial responsibility for paying covered health care claims rather than transferring that risk to an insurance carrier through the payment of premiums. The plan sponsor collects contributions, holds reserves, and pays claims as they arise, often using a third-party administrator (TPA) to process payments and manage network access.

Under the ACA, self-funded group health plans are governed primarily through ERISA (the Employee Retirement Income Security Act of 1974), with the Department of Labor (DOL) holding primary enforcement authority over plan administration and the IRS enforcing the employer mandate provisions under Internal Revenue Code §4980H. The ACA itself was layered on top of ERISA's existing framework rather than replacing it.

The scope distinction matters because Section 1201 of the ACA — which amended the Public Health Service Act to impose market reform rules on health insurance — applies differently depending on funding structure. Self-funded plans are subject to federal market reforms but are largely preempted from state insurance mandates under ERISA Section 514. This preemption is the principal reason employers with operations across multiple states find self-funded arrangements strategically attractive; a single plan design can apply nationally without conforming to 50 different state benefit mandates.

The broader regulatory context for ACA compliance — covering the agencies, statutes, and enforcement mechanisms involved — provides additional background on how these overlapping frameworks interact.

How it works

Self-funded plan operation follows a defined structural sequence:

Plan document execution. The employer drafts a written plan document and summary plan description (SPD) satisfying ERISA §102 and §104 requirements. The plan document defines eligibility, covered benefits, exclusions, and claims procedures.
Stop-loss insurance procurement. Most self-funded employers purchase stop-loss (excess loss) coverage to cap financial exposure. Specific stop-loss policies reimburse the employer for individual claims exceeding a per-claimant attachment point (commonly ranging from $50,000 to $500,000 or more). Aggregate stop-loss policies cap total plan year liability across all claims.
TPA engagement. A third-party administrator handles claims adjudication, network contracting, utilization management, and participant communications. The employer remains the plan fiduciary under ERISA, meaning TPA errors do not transfer the employer's fiduciary duty.
ACA compliance layering. The employer applies mandatory ACA market reforms to the plan design:
Prohibition on lifetime and annual dollar limits on essential health benefits (ACA §2711)
Coverage for dependents to age 26 (ACA §2714)
Prohibition on pre-existing condition exclusions ([ACA §2704])
First-dollar coverage of preventive services rated A or B by the U.S. Preventive Services Task Force (ACA §2713)
No cost-sharing for grandfathered preventive services (subject to ongoing litigation following Braidwood Management v. Becerra)
Employer mandate compliance. Applicable Large Employers (ALEs) — those with 50 or more full-time equivalent employees — must offer minimum essential coverage meeting minimum value and affordability standards to full-time employees or face IRC §4980H penalties. Self-funded status does not alter this obligation.
IRS reporting. ALEs sponsoring self-funded plans use Forms 1095-C and 1094-C to report offers of coverage. Self-funded plan sponsors complete Part III of Form 1095-C to report actual enrollment, a requirement that does not apply to ALEs using fully insured coverage (where the insurer handles enrollment reporting).

Common scenarios

Large employer replacing fully insured coverage. An employer with 800 employees moves from a fully insured carrier arrangement to a self-funded plan administered by a TPA. The employer retains the same network through a leased network agreement and purchases specific stop-loss with a $150,000 per-claimant attachment point. The ACA market reforms continue to apply; the primary change is that state-mandated benefits (such as state infertility coverage mandates) no longer bind the plan under ERISA preemption.

Level-funded arrangement for smaller employers. Employers below the ALE threshold — fewer than 50 full-time equivalents — may access "level-funded" plans, which are a hybrid product: the employer pays a fixed monthly amount, and the arrangement is structured as self-funded with stop-loss protection. Because these employers are not ALEs, they face no IRC §4980H penalty exposure, but the ACA's market reforms still apply if the plan is structured as a self-funded group health plan rather than an individual insurance product.

Reference-based pricing plans. Some self-funded employers replace traditional network contracts with reference-based pricing, reimbursing providers at a fixed percentage of Medicare rates (often 140–200% of Medicare). These designs require careful structuring to avoid ACA cost-sharing violations, particularly the out-of-pocket maximum limits (45 CFR §147.104), which cap individual out-of-pocket at amounts adjusted annually by HHS — $9,450 for self-only coverage in plan years beginning in 2024 (CMS Out-of-Pocket Maximum Notice).

Captive arrangements. Groups of employers — particularly in the same industry — sometimes pool stop-loss exposure through a captive insurance entity. The underlying plan for each member employer remains self-funded and subject to ERISA and ACA market reforms; the captive addresses only the risk-financing layer above each employer's retention.

Decision boundaries

The choice between self-funded and fully insured plan design turns on four primary variables:

1. Risk tolerance and claims predictability. Self-funding transfers claims volatility to the employer. Employers with fewer than 200 employees typically face more pronounced year-to-year claims variance; below approximately 100 employees, stop-loss attachment points may be priced in ways that erode the cost advantages of self-funding.

2. Regulatory relief from state mandates. ERISA §514 preempts state insurance laws as applied to self-funded plans. Employers operating in states with extensive mandated benefit laws — such as California, New York, or New Jersey — often realize administrative simplification by moving to a single federally governed self-funded plan. Fully insured plans remain subject to state law in each state where coverage is issued.

3. ACA obligations that remain constant. Self-funded status does not eliminate employer mandate penalties, reporting requirements, or ACA market reforms. The ACA compliance resources at acaauthority.com document these persistent obligations in full. Employers sometimes incorrectly assume that self-funding removes ACA compliance burdens; the correct analysis is that it selectively removes state-law obligations while federal ACA requirements remain intact.

4. Essential health benefits and self-funded plans. A critical ACA boundary: self-funded large-group plans are not required to cover the full set of essential health benefits (EHBs) defined under ACA §1302 and 45 CFR Part 156. The EHB mandate in its full form applies to non-grandfathered individual and small-group insurance plans. Self-funded plans are, however, prohibited from placing annual or lifetime dollar limits on EHBs, even without being required to cover every EHB category. This asymmetry — no mandate to cover EHBs, but restrictions on how coverage is limited if EHBs are covered — is one of the more technically complex boundaries in ACA plan design.

References

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)