Updated June 16, 2026 · 6 min read
Both an HSA (Health Savings Account) and an FSA (Flexible Spending Account) let you pay medical costs with pre-tax money, which lowers both your income tax *and* your FICA tax. The big differences are ownership and what happens to unused money: an HSA is yours forever and rolls over, while an FSA is mostly use-it-or-lose-it and belongs to your employer. The catch is that an HSA requires a high-deductible health plan (HDHP). Here's the full comparison with 2026 numbers.
| HSA | FSA | |
|---|---|---|
| Requires a high-deductible plan? | Yes (HDHP) | No — any plan |
| 2026 contribution limit | $4,400 self / $8,750 family | $3,400 (health FSA) |
| Catch-up (age 55+) | +$1,000 | None |
| Unused money at year-end | Rolls over forever | Use it or lose it* |
| Who owns it | You — it's portable | Your employer |
| Can you invest it? | Yes | No |
| Change contributions mid-year? | Anytime | Only at open enrollment / life event |
| Money available up front? | Only what you've deposited | Full annual amount on day 1 |
*Many FSAs allow either a small carryover (up to $680 for 2026) or a grace period of up to 2.5 extra months — but not both, and only if your employer opts in. Anything left beyond that is forfeited.
Both accounts come out of your paycheck before taxes, so every dollar you contribute escapes income tax and (unlike a 401(k)) Social Security and Medicare tax too. If you're in the 22% federal bracket, $1,000 in either account saves roughly $300 in combined taxes.
Not a regular HSA and a regular (general-purpose) health FSA at the same time — that combination disqualifies you from HSA contributions. You can pair an HSA with a 'limited-purpose' FSA that only covers dental and vision. Dependent-care FSAs (for childcare) are separate and can be held alongside an HSA.
An HSA is owned by you, requires a high-deductible health plan, rolls over every year, and can be invested. An FSA is owned by your employer, works with any plan, but is largely use-it-or-lose-it. Both let you pay medical costs with pre-tax dollars.
If you're eligible for an HSA (you have a high-deductible plan), it's usually the stronger account because the money rolls over, stays yours, and can be invested. An FSA is the better choice when you don't have an HDHP or have predictable expenses you'll spend down this year.
For 2026, HSA limits are $4,400 for self-only coverage and $8,750 for family, plus a $1,000 catch-up at age 55+. The health FSA limit is $3,400, with an optional carryover of up to $680 if your employer allows it.
Yes. Unlike a traditional 401(k), money you put into an HSA or FSA through payroll is exempt from Social Security and Medicare tax as well as income tax, so the savings are larger per dollar.
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