Health Accounts in Self-Funded Plan Design

Self-funded employer health plans occupy a distinct regulatory space that shapes how HSAs, FSAs, and HRAs can be structured, combined, and administered. For employers that bear direct claims risk rather than paying fixed premiums to an insurer, the design of health accounts is not a peripheral benefit decision — it is a core financial and compliance matter. This page covers the definition and scope of self-funded plan design, the operational mechanics of integrating health accounts, common deployment scenarios, and the decision boundaries employers face when configuring these arrangements.

Definition and scope

A self-funded (also called self-insured) health plan is one in which the sponsoring employer assumes direct financial liability for employee health claims, rather than transferring that risk to an insurance carrier through a fully insured premium arrangement. Under the Employee Retirement Income Security Act of 1974 (ERISA), self-funded plans sponsored by private employers are governed primarily by federal law, which means state insurance mandates that apply to fully insured carriers generally do not apply (U.S. Department of Labor, ERISA Overview). This federal preemption gives self-funded plan sponsors significantly broader latitude in benefit design.

Health accounts — HSAs, FSAs, and HRAs — integrate with self-funded plans at the point where the employer controls both the claims mechanism and the account funding rules. The scope of that integration extends across plan eligibility criteria, deductible structures, and reimbursement frameworks that are all defined by the plan document rather than a carrier's standard product terms.

The Internal Revenue Code (IRC) governs the tax treatment of each account type regardless of whether the underlying medical plan is self-funded or fully insured. IRC §223 covers HSAs, IRC §106 and §105 cover HRAs, and IRC §125 governs FSAs through cafeteria plan rules. Because self-funded plans have greater design flexibility, employers can engineer deductible levels, out-of-pocket maximums, and carryover rules to optimize account compatibility in ways that fixed carrier products may not allow.

How it works

Self-funded plan design with integrated health accounts operates through a layered structure:

Plan document drafting. The plan sponsor drafts a Summary Plan Description (SPD) and plan document under ERISA that defines the deductible, covered services, and cost-sharing structure. These parameters determine which health accounts are legally compatible.
High-deductible threshold alignment. For HSA eligibility, the underlying plan must qualify as a High-Deductible Health Plan (HDHP) under IRC §223(c)(2). For the 2024 plan year, the IRS minimum deductible is $1,600 for self-only coverage and $3,200 for family coverage (IRS Revenue Procedure 2023-23). Self-funded sponsors can set deductibles precisely at or above these thresholds without being constrained by carrier product tiers.
Stop-loss coverage acquisition. Most self-funded employers purchase stop-loss (excess loss) insurance to cap aggregate or specific claims exposure. Stop-loss is a contract between the employer and an insurer, not a health plan, so it does not affect ERISA preemption or account eligibility rules.
Third-party administrator (TPA) engagement. A TPA processes claims, adjudicates benefits, and often administers the health account alongside the medical plan. The TPA implements the plan document's rules and interfaces with the account custodian or administrator.
Account funding and contribution mechanics. Employer HSA contributions flow directly to employee-owned custodial accounts. HRA credits are notional employer obligations recorded in the plan. FSA elections are collected through a Section 125 cafeteria plan. Each funding mechanism has distinct payroll, reporting, and forfeiture rules.
Coordination with ACA requirements. Self-funded plans remain subject to applicable Affordable Care Act (ACA) requirements — including the prohibition on annual and lifetime dollar limits on essential health benefits under 42 U.S.C. §300gg-11 — even though they are exempt from state insurance mandates. The health-accounts-and-aca-compliance rules apply to self-funded sponsors and must be reflected in plan document design.

Common scenarios

Scenario 1 — HDHP/HSA self-funded design. A mid-size employer with 400 employees moves from a fully insured PPO to a self-funded HDHP. The employer sets a $2,000 self-only deductible, seeds employee HSAs with $750 per year, and retains specific stop-loss at the $75,000 per-claimant level. Employees retain HSA portability and investment rights regardless of employment status, reducing the employer's ongoing obligation.

Scenario 2 — HRA layered over a self-funded plan. An employer with a non-HDHP self-funded plan establishes a traditional integrated HRA to reimburse cost-sharing after the deductible is met. Because the HRA is employer-funded and notional, no HSA is compatible in this configuration unless a limited-purpose HRA is used.

Scenario 3 — Self-funded plan with Section 125 FSA. An employer maintains a self-funded plan that does not qualify as an HDHP and offers a general-purpose Health Care FSA through a Section 125 cafeteria plan. The FSA election maximum is governed by IRS limits — $3,200 for 2024 (IRS Publication 969) — and is separate from the self-funded plan document itself.

Scenario 4 — ICHRA paired with a self-funded small group. A smaller employer uses an Individual Coverage HRA (ICHRA) under IRS Notice 2019-45 to reimburse employees for individual market premiums, bypassing the group health plan entirely. This is not technically a self-funded group plan, but it represents the outer boundary of employer-controlled health account design.

Decision boundaries

Employers evaluating self-funded plan design with health accounts face four primary decision boundaries:

HSA compatibility vs. HRA flexibility. An employer that wants employees to accumulate portable HSA savings must design the self-funded plan as a qualifying HDHP and may only offer a limited-purpose or post-deductible HRA alongside it — not a general-purpose HRA. General-purpose HRAs that reimburse expenses before the HDHP deductible is met disqualify employees from HSA contributions under IRS guidance (IRS Notice 2004-2).

Fully insured vs. self-funded cost structure. Self-funded plans eliminate the carrier's risk and profit margin but expose the employer to claims volatility. Stop-loss premiums, TPA fees, and plan administration costs replace the insurance premium. For employers with 100 or more enrolled employees, self-funding is statistically more predictable due to larger risk pools.

ERISA preemption scope. Because self-funded ERISA plans are preempted from state insurance law under 29 U.S.C. §1144, plan sponsors can design benefit structures — including health account integrations — that would be prohibited in a state-regulated fully insured product. This is particularly relevant for multi-state employers seeking uniform benefit design.

Nondiscrimination testing exposure. Self-funded plans are subject to IRC §105(h) nondiscrimination rules, which prohibit plans from disproportionately benefiting highly compensated employees. HRA designs embedded in self-funded plans must satisfy these tests. FSAs under Section 125 have their own nondiscrimination testing requirements. HSAs, as individual accounts, are not subject to §105(h), but employer contribution strategies must be structured consistently for all eligible employees.

For a broader introduction to how these accounts fit within the employer benefits landscape, the main resource index provides orientation across all account types and plan structures.

References

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