No, an FSA is not an HSA, though they look similar at first glance

A Flexible Spending Account (FSA) and a Health Savings Account (HSA) are both tax-advantaged accounts that let you set aside pre-tax money for medical expenses. But they have different owners, different rules about what happens to unused money, different contribution limits, and different may be able to access requirements. The biggest difference: money in an FSA that you don't spend by the end of the plan year is gone. Money in an HSA rolls over forever and grows like an investment account.

If your employer offers both, you can't have both at the same time. You pick one. Understanding which account you actually have—and what the rules are—matters because the penalties for mixing them up are real.

Key Takeaways

  • An FSA is run by your employer and the money expires at the end of the plan year; an HSA is yours to keep and grows year to year.
  • You can only open an HSA if you're enrolled in a high-deductible health plan (HDHP); an FSA has no plan requirement.
  • FSA contribution limits are set by your employer (usually $2,500 to $3,200 per year); HSA limits are higher and set by federal law.
  • Both accounts cover the same medical expenses, but only an HSA lets you invest the money and use it in retirement.
  • If you have an FSA, you must spend the money or lose it; if you have an HSA, unused money is yours forever.

Who owns the account and what happens to leftover money

Your employer owns and administers your FSA. You contribute money through payroll deduction, and your employer holds the account. At the end of the plan year (usually December 31), any money you didn't spend is forfeited—you lose it. Some employers offer a grace period of up to 2.5 months into the next year to spend remaining funds, or a carryover of up to $610 (the amount changes annually), but most do not. The "use it or lose it" rule is the defining feature of an FSA.

An HSA is yours. You own it, you control it, and you can take it with you if you change jobs or retire. Money you don't spend in a given year stays in the account and earns interest or investment returns. There is no expiration date. This is why an HSA functions like a retirement account—you can let the money grow for decades.

may be able to access: who can open each account

To open an HSA, you must be enrolled in a high-deductible health plan (HDHP). Your employer chooses whether to offer an HDHP, and you choose whether to enroll in it. If your employer doesn't offer an HDHP, you cannot open an HSA through them. You can open one independently if you buy an HDHP on the individual market, but most people get HSAs through their employer.

An FSA has no plan requirement. Your employer can offer an FSA to anyone on any health plan—HMO, PPO, HDHP, or otherwise. This makes FSAs more widely available, but it also means you might have an FSA without realizing you could have an HSA instead.

You cannot have both an FSA and an HSA in the same year. If your employer offers both, you must choose one during open enrollment. If you have an FSA and later switch to an HDHP, you can switch to an HSA the following year.

How much you can contribute each year

FSA contribution limits are set by your employer, not by federal law. Most employers cap FSA contributions between $2,500 and $3,200 per year. Your employer decides the limit and communicates it during open enrollment. You contribute through payroll deduction, and the money is taken out before taxes, which reduces your taxable income.

HSA contribution limits are set by federal law and are higher. For 2024, the limit is $4,150 for individual coverage and $8,300 for family coverage. These limits change annually. If you're 55 or older, you can contribute an additional $1,000 per year ("catch-up" contributions). Like an FSA, HSA contributions are pre-tax and reduce your taxable income.

What medical expenses both accounts cover

Both FSAs and HSAs cover the same list of may have access to medical expenses: copays, coinsurance, deductibles, prescription drugs, dental work, vision care, mental health treatment, and many over-the-counter items (with a doctor's note). You can use either account to pay for these expenses directly, or you can pay out of pocket and reimburse yourself from the account later.

The IRS publishes a full list of may have access to expenses. If you're unsure whether something qualifies, check the IRS Publication 502 or ask your account administrator. Using account money for non-may have access to expenses triggers a tax penalty and income tax on the amount withdrawn.

How HSAs work differently in retirement and as investments

An HSA is the only health savings account that functions as a retirement account. After age 65, you can withdraw money from your HSA for any reason without penalty—you'll pay income tax on non-medical withdrawals, but no 20% penalty. This makes an HSA a powerful retirement tool: you can let the money grow tax-free for decades, use it for medical expenses tax-free while working, and then use it for anything in retirement.

An FSA cannot be used this way. Once the plan year ends, the money is gone. There is no investment option and no retirement component.

Many HSAs also let you invest the money in mutual funds, stocks, or bonds—similar to a 401(k) or IRA. Your HSA administrator determines what investment options are available. An FSA is typically a simple savings account with no investment option.

How to know which account you have

Check your benefits paperwork from your employer or your most recent benefits statement. It will say either "FSA" or "HSA" clearly. If you're unsure, contact your employer's benefits department or your health plan administrator. They can tell you which account you have, what the contribution limit is, and what the plan year end date is.

If you have an FSA, mark the plan year end date on your calendar and plan your spending accordingly. If you have an HSA, keep the account open even after you leave your job—the money is yours and will continue to grow.

Frequently Asked Questions

Can I transfer money from an FSA to an HSA?

No. You cannot move money between the two accounts. If you have an FSA and want to switch to an HSA, you must wait until the FSA plan year ends. Any unused FSA money is forfeited. You can then enroll in an HDHP and open an HSA in the following year.

What happens to my FSA money if I leave my job?

You lose it. FSA money is forfeited when your employment ends, even if you have unused funds. Some employers allow you to continue the FSA under COBRA for a limited time, but the money still expires at the end of the plan year. An HSA, by contrast, stays with you and is yours to keep.

Can I use my HSA to pay for my spouse's medical expenses?

Yes. HSA money can be used for may have access to medical expenses of you, your spouse, and your dependents, regardless of whether they're on your health plan. An FSA has the same rule—you can use it for family members' medical expenses.

Do I have to spend my HSA money before I turn 65?

No. You can let HSA money accumulate indefinitely. After age 65, you can withdraw it for any reason without the 20% penalty (though you'll owe income tax on non-medical withdrawals). This is one reason an HSA is often called a "stealth retirement account."

What if I contribute to an FSA but don't use all the money?

The unused money is forfeited at the end of the plan year. Some employers offer a grace period (usually 2.5 months into the next year) or a carryover of up to $610, but most do not. This is why it's important to estimate your medical expenses carefully before contributing to an FSA.