FSA vs HSA: Which Should You Use?
It's open-enrollment season and HR is asking you to pick — FSA or HSA? They sound similar, but one is a "spend it or lose it" account and the other is arguably the best retirement tool nobody talks about. Here's the honest comparison.
FSA limit
$3,400
2026, use-it-or-lose-it
HSA self-only
$4,400
Rolls over forever
HSA family
$8,750
Investable, portable
Key difference
Rollover
HSA keeps; FSA expires
The Core Difference
Both accounts let you set aside pre-tax money for medical costs — that part is the same. The difference is what happens to the money you don't spend:
- FSA — "use it or lose it." Whatever you don't spend by the deadline is gone.
- HSA — the money is yours forever. It rolls over, can be invested, follows you between jobs, and never expires.
See what pre-tax contributions save you
Plug in your income to see the tax impact.
The FSA: Use It or Lose It
An FSA lets you set aside up to $3,400 (2026) pre-tax for medical expenses. The catch: you must generally spend it within the plan year (some plans allow a small rollover or a grace period, but that's optional). If you have predictable medical costs — glasses, copays, a known procedure — an FSA is a fine, simple way to save the tax. Just don't over-contribute.
The HSA: The Keeper
An HSA requires a high-deductible health plan, but it's the more powerful account by a mile. The 2026 limits are $4,400 self-only and $8,750 family. The money:
- Rolls over year after year.
- Can be invested and grow tax-free.
- Comes out tax-free for medical expenses — at any age.
- After 65, can be withdrawn for anything (taxed like a traditional IRA).
That's why the HSA is called the "triple tax advantage" account, and why many people fund it aggressively and treat it like a stealth retirement fund.
Which Should You Pick?
- You have predictable yearly medical costs and a regular health plan → an FSA is simple and fine.
- You're on a high-deductible plan and can afford to save → the HSA is strictly better long-term.
- You want a retirement edge → HSA, every time.
Frequently Asked Questions
Can I have both an FSA and an HSA?
Generally not a regular healthcare FSA. You can pair an HSA with a "limited-purpose" FSA that only covers dental and vision. A general-purpose FSA disqualifies you from HSA contributions.
Does FSA money really disappear?
Yes, if you don't spend it by the deadline — though many plans offer a grace period or let you roll over a small amount (up to a few hundred dollars). Check your plan's specific rule.
Can I use HSA money for non-medical things?
Before 65, non-medical withdrawals are taxed plus a 20% penalty. After 65, they're taxed as ordinary income (like a traditional IRA) with no penalty. Medical expenses are always tax-free.
Which is better for a young healthy person?
The HSA — young and healthy is exactly when you can let the HSA compound for decades tax-free, using it as a long-term healthcare and retirement fund.
Sources
- IRS — 2026 FSA and HSA contribution limits.
- IRS Publication 969 — Health Savings Accounts and FSAs.
- IRS — HSA eligibility and HDHP requirements.
This is informational, not tax or benefits advice. Your plan's specific rules may vary.