What Is the Difference Between FSA and HSA? The Five That Matter

Plain English Benefits · Updated September 16, 2026 · Education, not tax advice

Short Answer

An FSA (flexible spending account) is owned by your employer, typically expires at year-end, and works with any health plan. An HSA (health savings account) is yours permanently, rolls over forever, and requires a high-deductible health plan. Both use pre-tax dollars for medical expenses, but the ownership and rollover rules are opposite.

The five differences that actually matter: who owns it, what happens to unused money, what health plan you need, contribution limits, and whether you can take it when you leave.

Who Owns the Account

FSA: Your employer owns it. You contribute through payroll deduction, but the account belongs to the company. When you leave that job, you typically forfeit anything left in the account unless you're eligible for COBRA continuation.

HSA: You own it. The account is yours whether you're employed, retired, or between jobs. It follows you from employer to employer the same way a 401(k) does.

That ownership difference is why HSAs can roll over and FSAs usually can't.

What Happens to Unused Money

FSA: Most plans follow the "use it or lose it" rule. If you don't spend your full contribution by the plan's deadline, you forfeit what's left. Some employers offer a grace period (up to 2.5 months into the next year) or allow you to carry over up to $640, but neither is required. You get one or the other, not both.

Our full breakdown of FSA rollover rules explains the grace period and carryover options.

HSA: Every dollar rolls over, every year, forever. You can accumulate a balance across decades. Some people treat it as a stealth retirement account because after age 65 you can withdraw for any reason (taxed as ordinary income, but no penalty).

Health Plan Requirements

FSA: Works with any health insurance plan, or no plan at all. Your employer just needs to offer the FSA as part of a Section 125 cafeteria plan.

HSA: Requires a high-deductible health plan (HDHP) that meets IRS minimums. For 2026, that means a deductible of at least $1,650 for self-only coverage or $3,300 for family coverage. If your plan doesn't qualify, you can't contribute to an HSA.

You also can't be covered by other health coverage that pays before the deductible is met. That's why most people can't combine a regular health FSA with an HSA—though a limited-purpose FSA (dental and vision only) is allowed. See the HSA and FSA compatibility rules for the full matrix.

Contribution Limits

FSA (health care): $3,300 per person for 2026. If you're married and both have access to an FSA, you can each contribute up to that limit.

HSA: $4,300 for self-only coverage, $8,550 for family coverage in 2026. If you're 55 or older, you can add another $1,000. These limits apply per person, not per account—if you and your spouse both have HSA-eligible coverage, the family limit is split between you.

When You Leave Your Job

FSA: You lose it unless you elect COBRA continuation, which means paying the full monthly administrative fee to keep access. Most people don't bother unless they have a large balance and a planned expensive procedure.

HSA: You keep it. The account is yours. You can keep using it, keep contributing to it (as long as you stay on an HDHP), or let it sit and grow. The employer connection only matters for payroll contributions—you can fund an HSA on your own if you're self-employed or between jobs.

Which One Makes Sense for You

If your health plan qualifies for an HSA and you can afford to let money sit, the HSA is almost always the better long-term choice. The rollover and portability make it more flexible.

If you don't have an HDHP, an FSA is your only option for pre-tax medical spending. It's still worth using if you have predictable expenses—prescriptions, glasses, regular doctor visits—but you need to estimate carefully because of the year-end deadline.

Some employers offer both, as long as the FSA is limited-purpose (dental and vision only). That combination is covered in detail in what is a limited purpose FSA.

FAQ

Can I have both an FSA and an HSA at the same time?

Not a regular health care FSA. You can combine an HSA with a limited-purpose FSA (dental and vision expenses only) or a dependent care FSA (childcare and elder care), but a full health care FSA disqualifies you from HSA contributions.

Do FSA and HSA contributions lower my taxable income the same way?

Yes, both reduce your taxable income when contributed through payroll. HSA contributions are also deductible if you contribute outside of payroll (like if you're self-employed), which FSAs don't allow.

Which one has better investment options?

HSAs. Because the money rolls over, most HSA providers let you invest balances above a certain threshold (often $1,000 to $2,000) in mutual funds or other investments. FSAs don't offer investment options because the money doesn't stick around long enough.

If I switch jobs mid-year, what happens to each account?

Your HSA comes with you, fully intact. Your FSA typically ends on your last day of employment unless you elect COBRA. If you had $800 in your FSA and you leave in June, you either use it before you go or lose it—COBRA continuation usually isn't worth the administrative cost unless you have a large balance and a scheduled procedure.

Running the Plan, Not Just Using It?

If you're the one setting up these accounts for your team, the Section 125 setup guide walks through the plan document, payroll mechanics, and the two mistakes that catch almost everyone—in plain English.