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Both an HSA and FSA let you pay for medical expenses with pre-tax dollars. But they work very differently. Choosing the wrong one — or missing out on one — can cost you real money. Here is the full comparison for 2026.
What Is an HSA?
An HSA is a Health Savings Account. To open one, you must be enrolled in a High-Deductible Health Plan (HDHP). You contribute pre-tax money. It grows tax-free. Withdrawals for qualified medical expenses are tax-free. That is the “triple tax advantage.”
Unlike most accounts, an HSA rolls over completely every year. There is no use-it-or-lose-it rule. Your HSA balance can compound for decades.
What Is an FSA?
An FSA is a Flexible Spending Account. You can open one with most employer health plans, including non-HDHP plans. You contribute pre-tax money. It can be used for qualified medical or dependent care expenses.
The key difference: most FSAs have a use-it-or-lose-it rule. Money you do not use by the end of the plan year is forfeited (with one exception — see below).
HSA vs FSA: 2026 Contribution Limits
| Account | 2026 Contribution Limit |
|---|---|
| HSA (individual) | $4,300 |
| HSA (family) | $8,550 |
| HSA catch-up (age 55+) | +$1,000 |
| Healthcare FSA | $3,300 |
| Dependent Care FSA (per household) | $5,000 |
Limits as of May 2026.
HSA vs FSA: Side-by-Side Comparison
| Feature | HSA | FSA |
|---|---|---|
| Requires HDHP? | Yes | No |
| Rolls over? | Yes, fully | No (limited carryover or grace period) |
| Portable (if you change jobs)? | Yes | No (tied to employer) |
| Invest the balance? | Yes (once balance exceeds threshold) | No |
| Triple tax advantage? | Yes | No (pre-tax only) |
| Available at start of year? | Only what you’ve contributed | Full annual election upfront |
The FSA Carryover Rule
Some FSA plans allow a small carryover. In 2026, the maximum carryover for a healthcare FSA is $660. Any amount above that is forfeited. Other plans offer a grace period — 2.5 months after the plan year ends to use the remaining funds. Ask your employer which option your plan uses.
What Can You Spend HSA and FSA Money On?
Both cover a wide range of medical expenses including:
- Doctor’s office copays and deductibles
- Prescription drugs
- Dental and vision expenses
- Mental health services
- Medical equipment (crutches, blood pressure monitors)
- Over-the-counter medications (now eligible after the CARES Act)
- Sunscreen with SPF 15+
Cosmetic procedures and most gym memberships are not eligible.
The HSA as a Retirement Account
Here is the power of an HSA that most people miss: after age 65, you can withdraw HSA money for any reason. You pay ordinary income tax on non-medical withdrawals — the same as a traditional IRA. But for medical expenses, it stays tax-free forever.
This makes an HSA function as a stealth retirement account — especially valuable because healthcare costs are one of the biggest expenses in retirement. You can invest your HSA balance in index funds and let it grow for decades.
Which Should You Choose?
Choose an HSA if:
- You are enrolled in a qualifying HDHP
- You are relatively healthy and do not expect high medical bills this year
- You want to invest the balance and use it in retirement
Choose an FSA if:
- Your employer does not offer an HDHP or HSA option
- You have predictable, high medical or childcare expenses this year
- You want access to the full annual election from January 1
Use your savings strategically alongside other smart money tools. See our picks for best budgeting apps to track all your accounts in one place. And build a proper emergency fund — here is how much to save and where to keep it.
Frequently Asked Questions
Can I have both an HSA and an FSA?
Generally, no. You cannot have a standard healthcare FSA if you have an HSA. However, you can have an HSA paired with a Limited Purpose FSA (for dental and vision only) or a Dependent Care FSA (for childcare). Check with your employer to see what is available.
What happens to my HSA if I switch to a non-HDHP plan?
You keep all the money in your HSA. You can still use it for qualified medical expenses tax-free. You just cannot make new contributions until you are enrolled in an HDHP again. The existing balance continues to grow tax-free.
Is an HDHP actually a good deal if I use it with an HSA?
Often yes — especially for healthy individuals and families. The lower monthly premiums of an HDHP can more than offset the higher deductible when you are not a heavy healthcare user. The HSA tax savings add additional value. Run the numbers for your specific premium difference versus expected out-of-pocket costs.
How do I invest my HSA funds?
Most HSA providers require a minimum cash balance (often $1,000-$2,000) before you can invest. Once you exceed that threshold, you can typically move excess funds into mutual funds or ETFs. Fidelity and Lively offer HSAs with no investment minimums and low-cost investment options.
What happens to unused FSA money at the end of the year?
Most of it is forfeited. Depending on your plan, you may be able to carry over up to $660 into the next year, or you may have a 2.5-month grace period to use remaining funds. Always check your plan rules so you do not lose money you already set aside.