- HSA vs. FSA Pros and Cons
- Tax Advantages and Contribution Limits
- Fund Rollover and Ownership
- Eligibility and Qualified Expenses
- Can You Have an HSA and an FSA at the Same Time?
- How a MERP Differs in Funding, Eligibility, Portability and Reimbursement
- How The Difference Card's MERP Solution Saved One Employer $230,000
- Which Is Better, an HSA or an FSA?
As open enrollment approaches, whether you choose a health savings account (HSA) or a flexible spending account (FSA) can affect what you pay out of pocket for medical care next year. Comparing eligibility requirements, tax benefits and unused balances helps you weigh your options. Your employer may also offer a medical expense reimbursement plan (MERP), which follows different funding and reimbursement rules.
HSA vs. FSA Pros and Cons
The difference between an HSA and an FSA affects how you fund medical care and manage unused money. Weigh these trade-offs against your expected expenses.
Tax Advantages and Contribution Limits
An HSA offers deductible or pretax contributions, federally tax-free investment earnings and tax-free withdrawals for qualified expenses. Taylor Britt, The Difference Card's Vice President of Marketing, with more than 10 years of health insurance experience, explains, "This combination creates what many financial professionals call the triple tax advantage."
The 2027 HSA contribution limits set the ceiling at $4,500 for self-only coverage or $9,000 for family coverage, including employer contributions. Eligible participants age 55 or older can add $1,000. An FSA offers pretax contributions and tax-free qualified reimbursements without investment growth. Its salary reduction limit is $3,500 for 2027.
Fund Rollover and Ownership
Your HSA belongs to you, follows you between jobs and rolls over indefinitely. Your employer controls the FSA, and any unused funds are generally forfeited unless your employer offers a grace period or limited carryover.
A grace period gives you extra time to incur eligible expenses, while carryover preserves a limited balance for the following plan year. In 2024, approximately four in 10 FSA holders in the Employee Benefit Research Institute database forfeited money, with forfeitures averaging $404.
Eligibility and Qualified Expenses
To contribute to an HSA, you must have an HSA-qualified high-deductible health plan (HDHP) and meet other eligibility requirements. You cannot be enrolled in Medicare, have disqualifying health coverage or be eligible to be claimed as a dependent on another person's tax return.
An FSA does not require an HDHP, although employers must offer it. Both accounts can cover qualified doctor visits, prescriptions and dental or vision care. You cannot reimburse the same expense from both accounts, so keep records showing which account paid each bill.
Can You Have an HSA and an FSA at the Same Time?
A general-purpose FSA usually prevents HSA contributions, even if you have an HSA-qualified health plan. You can remain eligible if your FSA restricts benefits to eligible dental and vision costs or follows IRS rules for reimbursement after the required deductible is met.
Ask your benefits team how your accounts work together. If your employer also offers a MERP structured as a health reimbursement arrangement (HRA), review its rules too. This reimburses eligible expenses, and it can affect your ability to contribute to an HSA.
How a MERP Differs in Funding, Eligibility, Portability and Reimbursement
Chris Frascarelli, The Difference Card's Senior Sales Consultant, brings more than 15 years of insurance and healthcare experience to his explanation of employer-funded reimbursement. His HRA comparison provides useful context for evaluating a MERP across four dimensions:
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Funding: Your employer funds this reimbursement benefit, with no employee contributions. Qualified medical reimbursements generally remain excluded from your taxable income, while the employer sets the available benefit amount.
Eligibility: Your employer establishes participation terms within legal requirements, rather than applying a universal HDHP requirement. HSA-compatible designs can limit reimbursements to dental, vision or permitted preventive care, or postpone broader reimbursement until the required deductible is met.
Portability: Frascarelli notes, "Portability is where an HRA and an FSA fall short." You typically cannot take an unused MERP benefit with you to another employer, although continued access depends on the plan's terms and applicable continuation rights.
Reimbursement: A MERP may require you to pay an eligible bill and submit documentation for reimbursement, although some employers structure the plan with a card-based payment system instead, similar to an HSA or an FSA. Reimbursement mechanics vary by plan design.
How The Difference Card's MERP Solution Saved One Employer $230,000
A Texas real estate technology company with more than 200 employees expected its health insurance costs to exceed $3.1 million in 2026. The challenge was to lower that spending while preserving employee benefits and plan choice.
Its broker and insurer introduced higher deductibles, cutting annual fixed premiums by more than $500,000. Employees could still choose between a preferred provider organization copay buy-up plan and an HSA-qualified HDHP. The Difference Card, a company administering employer-funded medical reimbursement benefits, then designed a MERP to reimburse eligible out-of-pocket expenses and offset the higher deductibles.
Under a pay-as-you-go model, the employer funded claims as they arose, with payments processed through a card-based system. The arrangement delivered $230,000 in guaranteed annual savings after accounting for MERP funding, without reducing benefits or plan choice. If MERP funding exceeded the agreed threshold, the Difference Guarantee covered the excess.
This example shows how lower premiums and employer-funded reimbursements can work together within a broader benefits strategy. Whether a MERP preserves your ability to contribute to an HSA depends on its design. An HRA that reimburses dental and vision fees can remain compatible, for example.
Which Is Better, an HSA or an FSA?
Your eligibility, expected expenses and preference for long-term savings shape the answer, while an employer-funded MERP addresses a different funding need. Before open enrollment closes, review premiums, deductibles, employer funding and reimbursement restrictions with your benefits broker or human resources team so you can compare the complete package.
