FSA vs HSA: Which Healthcare Account Saves You More in 2025?

Both Flexible Spending Accounts (FSAs) and Health Savings Accounts (HSAs) let you pay for medical expenses with pre-tax dollars — but they work very differently. Choosing the wrong one could cost you hundreds of dollars per year. Here's exactly how they compare.

What Is an FSA?

A Flexible Spending Account (FSA) is employer-sponsored and lets you set aside pre-tax dollars to pay for eligible medical expenses. The key limitation: it has a "use it or lose it" rule — most funds expire at year-end, with employers optionally offering a grace period or allowing up to $640 to roll over.

FSAs work with any health insurance plan, making them accessible to more workers. Funds are available in full on day one of the plan year, which is helpful if you have a large expected expense in January.

What Is an HSA?

A Health Savings Account (HSA) is available only to people enrolled in a High-Deductible Health Plan (HDHP). It offers a triple tax advantage: contributions are pre-tax, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. Unused funds roll over indefinitely — and after age 65, you can withdraw for any purpose (taxed as ordinary income, like a 401k).

Which One Should You Choose?

If your employer offers an HDHP and you're relatively healthy, an HSA is almost always the better long-term choice. The unlimited rollover and investment potential make it a powerful retirement savings vehicle alongside its healthcare utility.

If you can't use an HDHP — due to a chronic condition, family health needs, or employer limitations — an FSA is still valuable. Just be deliberate about spending down the balance before year-end.

Eligible Expenses for Both Accounts

Both accounts cover a broad range of out-of-pocket medical costs including: copays and deductibles, prescription medications, dental and vision care, hearing aids, mental health services, and many over-the-counter items since the CARES Act expanded eligibility in 2020.

Using FSA/HSA to Pay Athena Health Bills

Good news: if you receive a bill through an athenahealth provider, you can pay it using your FSA or HSA card directly through the QuickPay Portal at quickpayportal.com. Simply enter your QuickPay Code and select your HSA/FSA card as the payment method. It's one of the most convenient ways to use your tax-advantaged funds.