HSA vs FSA vs HRA: Overview and Comparison

Three distinct account types — Health Savings Accounts (HSAs), Flexible Spending Accounts (FSAs), and Health Reimbursement Arrangements (HRAs) — form the backbone of tax-advantaged health benefit design in the United States. Each operates under separate Internal Revenue Service authority, carries different eligibility rules, and serves different coverage situations. Understanding the boundaries between them determines whether an individual or employer captures maximum tax efficiency or leaves deductible benefits unused.

Definition and scope

All three account types derive their tax-favored status from the Internal Revenue Code, but they occupy distinct statutory positions. The regulatory context for health savings traces how Congress codified each mechanism separately and how the IRS enforces compliance through published guidance.

Health Savings Account (HSA): Authorized under IRC §223, an HSA is an individually owned, interest-bearing account available exclusively to individuals enrolled in a qualifying High-Deductible Health Plan (HDHP). The IRS sets HDHP minimum deductible and out-of-pocket maximum thresholds annually — for 2024, the minimum deductible is $1,600 for self-only coverage and $3,200 for family coverage (IRS Revenue Procedure 2023-23). Contributions may come from the account holder, an employer, or both.

Flexible Spending Account (FSA): Authorized under IRC §125 through a cafeteria plan, an FSA is an employer-sponsored benefit. Employees elect a contribution amount before the plan year begins and access the full election on day one. FSAs are not portable — they are tied to the employer's plan.

Health Reimbursement Arrangement (HRA): Authorized under IRC §106, an HRA is funded exclusively by the employer. No employee salary-reduction contribution is permitted. The employer reimburses documented qualified medical expenses up to a defined annual limit. HRA design rules were substantially updated by IRS and Treasury final regulations in 2019, which introduced the Individual Coverage HRA (ICHRA) and expanded the Qualified Small Employer HRA (QSEHRA) framework (IRS Notice 2019-45; 26 CFR Part 54).

How it works

Each account type follows a distinct funding, access, and rollover structure.

HSA mechanics:
1. The account holder opens the HSA with a qualified trustee (bank, credit union, or insurance company approved under IRC §223(d)(1)).
2. Contributions are deposited pre-tax (via payroll) or are tax-deductible if made directly.
3. Funds are withdrawn tax-free for qualified medical expenses as defined under IRC §213(d).
4. Unused balances roll over indefinitely — there is no annual forfeiture.
5. After age 65, non-medical withdrawals are taxed as ordinary income but carry no additional penalty, making the HSA function as a supplemental retirement account.

For 2024, the contribution limit is $4,150 for self-only coverage and $8,300 for family coverage, with a $1,000 catch-up contribution permitted for individuals age 55 and older (IRS Rev. Proc. 2023-23).

FSA mechanics:
1. The employee elects an annual contribution during open enrollment under the employer's §125 cafeteria plan.
2. The full election amount is available on the first day of the plan year.
3. Funds must be spent on qualifying expenses within the plan year; the IRS "use-it-or-lose-it" rule governs forfeiture.
4. Employers may offer a grace period of up to 2.5 months or a carryover of up to $640 (2024 limit, per IRS Rev. Proc. 2023-34) — but not both simultaneously.
5. The 2024 FSA contribution limit is $3,200 per employee (IRS Rev. Proc. 2023-34).

HRA mechanics:
1. The employer establishes the HRA and sets the annual benefit limit — no statutory maximum applies to traditional group HRAs.
2. The employee submits documentation of a qualified expense; the employer reimburses from the HRA balance.
3. Reimbursements are excluded from the employee's gross income under IRC §106.
4. Carryover is at employer discretion; forfeiture upon termination is common unless the plan document specifies otherwise.
5. QSEHRA limits for 2024 are $6,150 (self-only) and $12,450 (family) (IRS Rev. Proc. 2023-34).

Common scenarios

Scenario 1 — Employer-sponsored HDHP with HSA: An employee covered by a qualifying HDHP through the employer contributes the maximum $8,300 (family, 2024) to an HSA. Because the employee also holds an HSA, the employer may not simultaneously offer a general-purpose FSA — doing so would disqualify HSA eligibility. A Limited-Purpose FSA restricted to dental and vision expenses is IRS-permitted alongside an HSA.

Scenario 2 — Traditional PPO with FSA: An employee enrolled in a non-HDHP PPO cannot open or contribute to an HSA but may participate in a general-purpose FSA if the employer offers one. The FSA's front-loaded access is valuable for early-year expenses such as surgery or orthodontics.

Scenario 3 — Small employer with QSEHRA: A small employer with fewer than 50 full-time-equivalent employees that does not offer a group health plan may establish a QSEHRA to reimburse employees for individual market premiums and qualified medical expenses, up to the 2024 statutory ceiling. Employees receiving QSEHRA benefits must report the benefit when applying for Marketplace subsidies under the Affordable Care Act.

Scenario 4 — Large employer with ICHRA: An employer of any size may offer an ICHRA to reimburse employees for individual coverage premiums and qualified expenses. Employees receiving a qualifying ICHRA are ineligible for Marketplace premium tax credits, per Treasury and IRS final rule published in June 2019.

Decision boundaries

Selecting the appropriate account type requires mapping four dimensions: plan eligibility, ownership structure, funding source, and rollover treatment. The National Health Savings Authority home resource provides structured navigation across all three account types.

Factor HSA FSA HRA
Who owns the account? Employee Employer plan Employer
Who can contribute? Employee and/or employer Employee (salary reduction) Employer only
HDHP required? Yes No No
Rollover at year-end? Unlimited Limited or none Employer discretion
Portable on job change? Yes No Generally no
Investment growth permitted? Yes No No
Statutory ceiling (2024) $8,300 family $3,200 per employee Varies by HRA type

Key decision rules:

  1. HDHP enrollment is the threshold gate. An individual not enrolled in a qualifying HDHP cannot contribute to or receive employer contributions into an HSA. All FSA and HRA types remain available regardless of plan type (subject to HRA-specific rules).
  2. HSA and general-purpose FSA are mutually exclusive. The IRS bars simultaneous participation in both; the limited-purpose FSA and dependent care FSA are the only FSA variants compatible with active HSA contribution.
  3. Employer-only funding defines the HRA. Any account that accepts employee salary-reduction contributions cannot be classified as an HRA under IRC §106; misclassification creates taxable income and potential excise tax exposure under IRC §4980D.
  4. Forfeiture risk favors the HSA. Funds in an FSA that exceed the carryover limit are forfeited to the employer's plan. HSA balances carry forward with no deadline.
  5. Portability favors the HSA. An HSA follows the individual regardless of employment change, COBRA status, or retirement. The regulatory context for health savings details how portability rules interact with ERISA and IRS guidance.
  6. Investment growth creates a compounding advantage. HSA trustees may offer mutual fund or brokerage investment options once a threshold cash balance is maintained. Neither FSAs nor HRAs permit investment of account balances.

For an employee who qualifies for an HDHP and anticipates long-term out-of-pocket costs or retirement health expenses, the HSA's triple tax advantage — deductible contributions, tax-free growth, and tax-free qualified withdrawals — provides the broadest structural benefit. For an employee on a lower-deductible plan who expects predictable current-year expenses, a general-purpose FSA captures immediate pre-tax savings without requiring plan change. For an employer seeking to control benefit cost while supporting employees in accessing individual market coverage, an ICHRA or QSEHRA provides a compliant reimbursement pathway without administering a group health plan.

References

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