Health Account Administration and Third-Party Providers

Health account administration encompasses the operational and compliance infrastructure required to maintain HSAs, FSAs, and HRAs in conformance with IRS rules and applicable federal law. Third-party administrators (TPAs) and custodians occupy distinct roles in this infrastructure, and selecting the wrong provider type — or misunderstanding the division of responsibilities — can trigger plan disqualification, tax liability, or participant harm. This page covers the definition and scope of health account administration, how the administrative process operates, the most common deployment scenarios, and the boundaries that determine which administrative structure a plan sponsor or individual account holder should use.

Definition and scope

Health account administration refers to the full set of functions required to open, fund, document, adjudicate, and report on tax-advantaged health accounts. The Internal Revenue Code establishes distinct legal frameworks for each account type: HSAs are governed under 26 U.S.C. § 223, FSAs are authorized under 26 U.S.C. § 125 (the cafeteria plan statute), and HRAs are authorized under 26 U.S.C. § 105(b) with supplemental rules issued by the IRS and the Departments of Treasury, Labor, and Health and Human Services.

The administrative ecosystem includes three distinct entity types:

  1. Custodians or trustees — For HSAs specifically, IRS Notice 2004-2, Q&A 9 requires that the account be held by a bank, insurance company, or IRS-approved nonbank trustee. The custodian holds assets, issues IRS Form 1099-SA to report distributions, and accepts Form 5498-SA data for contribution reporting.

  2. Third-party administrators (TPAs) — TPAs handle plan administration without holding assets. For FSAs and HRAs, the employer is the plan sponsor and technically the plan itself, but most employers contract a TPA to manage enrollment, claims adjudication, debit card issuance, and participant communications.

  3. Payroll integration partners — These entities coordinate pre-tax payroll deductions for HSA and FSA contributions, ensuring amounts are excluded from FICA and federal income tax withholding in accordance with IRS Publication 969.

The scope of administration differs by account type. HSA administration is primarily custodial — the account belongs to the individual, and the employer's involvement is limited to contribution deposits and payroll coordination. FSA and HRA administration is plan-level — the employer sponsors the plan, assumes fiduciary-adjacent responsibilities, and must maintain plan documents as required under ERISA where applicable. For a complete overview of the regulatory context for health savings, the applicable statutes, Treasury regulations, and agency guidance form the binding framework.

How it works

The administrative process follows a defined sequence for each account type:

  1. Plan document creation — FSA and HRA sponsors must maintain a written plan document. The IRS requires this under the cafeteria plan rules at Treasury Regulation § 1.125-1. HSAs do not require a plan document from the employer, but the custodian must execute an account agreement with the account holder.

  2. Enrollment and eligibility verification — TPAs collect enrollment elections during open enrollment or qualifying life events. For FSAs, elections are irrevocable for the plan year absent a qualifying change in status, per Treasury Regulation § 1.125-4.

  3. Contribution processing — Employer contributions and pre-tax payroll deductions flow through payroll systems. For HSAs, the custodian receives deposits and credits the individual account. The 2024 HSA contribution limit is $4,150 for self-only coverage and $8,300 for family coverage (IRS Rev. Proc. 2023-23).

  4. Claims adjudication — For FSAs and HRAs, the TPA reviews reimbursement requests against the list of qualified medical expenses under 26 U.S.C. § 213(d). Debit card transactions are auto-adjudicated against an IIAS (Inventory Information Approval System) database maintained under IRS Notice 2006-69.

  5. Tax reporting — Custodians file Form 1099-SA and Form 5498-SA for HSAs. Employers or their TPAs handle FSA and HRA reporting through W-2 Box 12 (Code W for employer HSA contributions) and general plan compliance filings. Detailed HSA tax reporting is covered separately on the HSA tax reporting Form 8889 page.

  6. Year-end administration — FSA plans must enforce use-it-or-lose-it forfeiture rules or apply carryover and grace period provisions. HRA administrators track carryover balances in conformance with plan design. HSA custodians carry balances forward without restriction.

Common scenarios

Employer-sponsored group FSA administered by a TPA — This is the most prevalent arrangement for employer-sponsored FSAs. The employer retains plan sponsor status, signs a TPA services agreement, and the TPA handles all participant-facing functions. The employer remains responsible for plan document maintenance and ERISA compliance where the FSA is not excepted from ERISA coverage.

HSA with a bank custodian and separate employer payroll integration — An employer selects a bank or financial institution as the HSA custodian and uses a payroll provider to transmit contribution files. The custodian and payroll vendor operate independently, and the employer must ensure data reconciliation between the two systems to avoid excess contribution errors.

ICHRA administered by a specialized TPA — Individual Coverage HRAs, authorized under 26 C.F.R. § 1.105-17 and final rules published jointly by Treasury, DOL, and HHS in June 2019, require substantiation that employees maintain qualifying individual health coverage before reimbursement. Specialized TPAs manage this verification workflow, which differs materially from traditional HRA or FSA adjudication.

Self-employed individual as sole HSA account holder — A self-employed individual with no employees opens an HSA directly with a custodian, contributes up to the statutory limit, and handles all tax reporting through IRS Form 8889. No TPA or employer plan infrastructure is involved.

Decision boundaries

The choice of administrative structure depends on account type, employer size, and plan complexity. The following distinctions define the operative boundaries:

Custodian vs. TPA — These are not interchangeable. An HSA custodian holds assets and has a federally regulated trust relationship with the account holder. A TPA administers claims and plan mechanics but holds no assets. Misclassifying a TPA as a custodian — or relying on a TPA to perform custodian functions — violates the account structure requirements under IRS Notice 2004-2.

Employer plan vs. individual account — HSAs are individual accounts. The employer does not sponsor the HSA; it only contributes to it. FSAs and HRAs are employer-sponsored plans. This distinction carries significant compliance consequences: an employer has no plan document obligations for an HSA but has affirmative obligations for FSA and HRA plan documents, summary plan descriptions (where ERISA applies), and COBRA administration for health FSAs.

ERISA applicability — Health FSAs are generally subject to ERISA. HRAs are also generally subject to ERISA. HSAs held outside an employer arrangement are not ERISA plans. The Department of Labor's guidance at 29 C.F.R. § 2510.3-1 addresses the payroll practice exception, which may exclude certain arrangements, but this determination is fact-specific.

Size thresholds for administrative complexity — Employers with fewer than 50 full-time equivalent employees are not subject to the Affordable Care Act's employer shared responsibility provisions under 26 U.S.C. § 4980H, but they remain subject to FSA and HRA plan document requirements regardless of size. Small employers considering HRAs should evaluate whether the Qualified Small Employer HRA (QSEHRA), authorized under 26 U.S.C. § 9831(d), is more appropriate than a traditional HRA — both require TPA support but have distinct annual contribution caps ($6,150 for self-only and $12,450 for family coverage in 2024, per IRS Notice 2023-73).

The main resource index for health savings accounts provides a structured entry point to the full account of HSA, FSA, and HRA topics covered across this reference network.

References

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