No, a flexible spending account (FSA) and a health savings account (HSA) are two separate things, though both let you set aside pre-tax money for medical costs.

An FSA is an employer-sponsored account where you contribute money before taxes are taken out, then spend it on may have access to medical expenses during the plan year. An HSA is a tax-advantaged savings account tied to a high-deductible health plan (HDHP) that you can carry money in from year to year. The biggest difference: FSA money expires at the end of the year if you don't use it (with limited exceptions), while HSA money rolls over indefinitely and can grow like an investment account.

You cannot have both an FSA and an HSA in the same year. If your employer offers an HSA-compatible plan, you can choose that and open an HSA instead of using an FSA. If your employer only offers a traditional health plan with an FSA, you use the FSA and cannot open an HSA until you switch to an HDHP.

Key Takeaways

  • FSA money must be spent within the plan year or it is forfeited; HSA money carries over year to year and can accumulate indefinitely.
  • An FSA is tied to your employer's plan and ends if you leave the job; an HSA belongs to you and moves with you.
  • You can only have an HSA if you are enrolled in a high-deductible health plan; FSAs work with any employer health plan.
  • Both accounts reduce your taxable income, but only an HSA can be invested to grow like a retirement account.
  • If you have access to an HSA through your employer, it usually offers more long-term value than an FSA.

How FSA and HSA contributions work differently

With an FSA, you decide at the start of the plan year how much to contribute—usually between $100 and $3,200 per year (the limit changes annually). That money comes out of your paycheck before federal income tax, Social Security tax, and Medicare tax are calculated. You then use a debit card or submit receipts to draw from the account throughout the year.

With an HSA, you also contribute pre-tax money, but the limit is higher—$4,150 for individual coverage and $8,300 for family coverage in 2024 (limits vary by year). You can contribute through payroll deduction if your employer offers it, or you can contribute directly to an HSA you open on your own. Unlike an FSA, you control the account entirely; it is not managed by your employer.

The tax savings are similar in both cases: if you contribute $2,000 to either account, you avoid paying income tax and payroll taxes on that $2,000. But the FSA savings end when the year ends and the money is gone. The HSA savings compound over time because unused money stays in the account.

What happens to unspent money at year-end

FSA money that is not spent by December 31 is forfeited—you lose it. This is called the "use-it-or-lose-it" rule. Your employer may offer a grace period (usually 2.5 months into the next year) to spend the remaining balance, but this is optional and not all plans include it. Some employers also allow you to carry over up to $610 of unused FSA funds into the next year, but again, this is optional.

HSA money never expires. If you don't spend it this year, it stays in the account. You can let it accumulate for decades, invest it in stocks or mutual funds (depending on your HSA provider), and use it in retirement. This makes an HSA function like a retirement savings account in addition to a medical account.

Because of the use-it-or-lose-it rule, FSA planning requires you to estimate your medical expenses accurately. If you overestimate, you forfeit the overage. If you underestimate, you pay out of pocket for expenses that could have been covered tax-free.

may be able to access and enrollment rules

You can open an FSA only if your employer offers one. You enroll during your company's open enrollment period, usually once a year. If you leave the job, the FSA account closes and any remaining balance is forfeited (with rare exceptions for COBRA continuation).

You can open an HSA only if you are enrolled in a high-deductible health plan (HDHP)—a plan with a deductible of at least $1,600 for individual coverage or $3,200 for family coverage in 2024. You do not have to enroll through your employer; you can open an HSA independently if you have an HDHP from any source. If you leave your job, the HSA stays with you and you keep the money forever.

You cannot have an FSA and an HSA at the same time. If your employer offers both, you choose one. Some employers offer an FSA alongside an HDHP, in which case you must choose: take the FSA and forfeit HSA may be able to access, or skip the FSA and open an HSA instead.

What medical expenses each account covers

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). Both accounts also cover expenses your health insurance does not cover, as long as they are medically necessary.

The main difference is not what you can buy, but what happens if you don't spend the money. With an FSA, unspent money vanishes. With an HSA, it stays available for future medical expenses—or for retirement, since you can withdraw HSA funds tax-free for any reason after age 65 (though non-medical withdrawals are taxed as income).

Which account offers better long-term value

If you have access to an HSA, it almost always offers more value than an FSA, especially if you are young and healthy. Here is why: an HSA lets you accumulate money year after year, invest it, and use it decades later. An FSA forces you to spend or lose the money every year.

An FSA makes sense in two situations. First, if you have predictable, high medical expenses each year (ongoing prescriptions, regular therapy, frequent dental work), you can use an FSA to cover those costs tax-free without worrying about losing money. Second, if your employer does not offer an HSA option, an FSA is better than nothing.

If your employer offers both, choose the HSA. Contribute what you can afford, use it to pay for current medical expenses, and let the rest grow. You can always withdraw the money later if you need it, and the tax advantages compound over time.

Portability and what happens when you change jobs

An FSA is tied to your employer. When you leave the job, the account closes. You can continue to submit claims for expenses you incurred while enrolled, but you cannot add new money or open a new FSA until you start a job that offers one. If you have unused FSA funds when you leave, they are forfeited (with rare exceptions for COBRA).

An HSA is yours to keep. When you leave your job, the account stays open and the money remains yours. You can continue to contribute to it if you have an HDHP from another source (a new job, a spouse's plan, or an individual plan). You can also leave the money untouched and let it grow. This portability is one of the biggest advantages of an HSA over an FSA.

Frequently Asked Questions

Can I use my FSA to pay for my HSA deductible?

No. If you have an FSA, you cannot have an HSA, so this situation does not arise. If you have an HSA, you can use HSA money to pay the deductible, but you cannot use an FSA to do so because you cannot have both accounts open at the same time.

What if I have an FSA and I get a new job with an HSA option?

You can switch to the HSA at your new job. Your old FSA account closes and any remaining balance is forfeited. You can then open an HSA through your new employer or independently, as long as you are enrolled in an HDHP.

Can I invest FSA money like I can with an HSA?

Some FSA providers allow limited investment options, but most do not. Most FSAs are designed to be spent quickly, so the money sits in a cash account. HSAs, by contrast, are designed for long-term growth and most providers offer investment options like mutual funds and stocks.

If I don't use my FSA money, can I get it back as a refund?

No. FSA money that is not spent by the end of the plan year (or grace period, if your plan offers one) is forfeited. It does not roll over and you cannot withdraw it. This is a federal rule, not a choice by your employer.

Is an HSA better than an FSA for everyone?

An HSA is better if you can afford to save money and let it grow. An FSA is better if you have high, predictable medical expenses each year and want to use the money immediately. If your employer only offers an FSA, it is still valuable because it reduces your taxes on medical spending.