No, they are not the same, and you cannot have both at the same time

A Health Savings Account (HSA) and a Flexible Spending Account (FSA) both let you set aside pre-tax money for medical costs. But they have different rules about who can open one, how much you can save, how long the money lasts, and what happens to it if you do not spend it. The biggest difference: an HSA is yours to keep forever and grows like a savings account, while an FSA is a use-it-or-lose-it account tied to your job. Your employer chooses which one to offer, and federal law prevents you from having both in the same year.

Understanding which account you have—or which one your employer offers—matters because the rules about what you can buy, how much you can contribute, and what happens to unspent money are completely different.

Key Takeaways

  • An HSA requires a high-deductible health plan and lets you keep the money indefinitely; an FSA is tied to your job and typically expires at year-end.
  • HSA contributions are higher ($4,150 for individual coverage in 2024, varying by year), while FSA limits are lower and set by your employer, usually $3,200 to $3,300 per year.
  • Money left in an FSA at year-end is forfeited unless your employer offers a grace period or carryover; HSA money rolls over automatically and earns interest or investment returns.
  • You can only have an HSA if you are enrolled in a high-deductible health plan; FSAs are available to anyone with employer health coverage.
  • Both accounts cover the same medical expenses, but HSA funds can be invested for retirement growth, while FSA funds sit in a spending account.

Who can open each account

To open an HSA, you must be 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 (these amounts vary by year). You cannot have other health coverage at the same time, with limited exceptions for dental, vision, or accident plans. You also cannot be claimed as a dependent on someone else's tax return, and you cannot be enrolled in Medicare.

An FSA has no such restrictions. If your employer offers one, you can open it as long as you are on the company health plan. You do not need a high-deductible plan. Many employers offer FSAs to all employees regardless of which health plan they choose.

How much you can contribute each year

HSA contribution limits are set by the IRS and change annually. For 2024, you can contribute up to $4,150 if you have individual coverage or $8,300 for family coverage. These limits are higher than FSA limits and increase slightly each year. If you are 55 or older, you can add an extra $1,000 per year as a catch-up contribution.

FSA limits are lower and vary by employer. Most employers cap FSA contributions between $3,200 and $3,300 per year, though the IRS allows up to $3,300 (this limit also changes annually). Your employer sets the exact amount, and you choose how much to contribute during open enrollment, up to that cap.

The key difference: HSA limits are higher, and you control the amount. FSA limits are lower, and your employer may set a cap below the IRS maximum.

What happens to money you do not spend

This is the most important difference between the two accounts. HSA money is yours permanently. If you do not spend it in a given year, it stays in your account and rolls over automatically. You can let it accumulate for decades, and it will grow through interest or investment returns (many HSAs let you invest the balance like a brokerage account). If you change jobs, you take the HSA with you. If you retire, you can keep using it for medical expenses, and after age 65, you can withdraw money for any reason without penalty (though non-medical withdrawals are taxed as income).

FSA money is use-it-or-lose-it. Money left in the account at the end of the plan year is forfeited—you lose it. Some employers offer a grace period (usually two and a half months into the next year) to spend remaining FSA funds, or a carryover of up to $640 into the next year. But if your employer offers neither, unspent money disappears. When you leave your job, you lose access to the FSA entirely.

What medical expenses each account covers

Both accounts cover the same list of may have access to medical expenses under IRS rules. This includes copays, coinsurance, deductibles, prescription drugs, dental work, vision care, mental health treatment, and over-the-counter medications (with a prescription). Both can pay for medical equipment like crutches, wheelchairs, or hearing aids.

The expenses are identical. The difference is not what you can buy—it is how long you have to spend the money and what happens to what you do not use.

Tax treatment and investment options

Both HSA and FSA contributions come out of your paycheck before taxes, so you save on federal income tax, Social Security tax, and Medicare tax. If you use the money for may have access to medical expenses, the withdrawal is tax-free in both accounts.

HSAs offer an additional advantage: investment options. Many HSA providers let you invest the balance in mutual funds, stocks, or bonds, similar to a 401(k). This means your HSA can grow over time and serve as a retirement savings tool. FSAs are typically held in a simple spending account with no investment options—the money just sits there until you spend it or lose it.

Why your employer chooses one or the other

Employers choose which account to offer based on their health plan design and administrative costs. An HSA requires offering a high-deductible plan, which shifts more medical costs to employees but often has lower premiums. An FSA works with any health plan and is simpler to administer, but employees lose unspent money each year.

Some larger employers offer both—an HSA paired with the high-deductible plan, and an FSA for employees on other plans. But you cannot contribute to both in the same year. If your employer offers both, you choose one during open enrollment.

Frequently Asked Questions

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

No. Federal law prohibits you from contributing to both in the same calendar year. If your employer offers both, you must choose one during open enrollment. However, if you had an FSA in a previous year and still have money in it, you can open an HSA in the current year as long as you do not contribute to the FSA anymore.

What happens to my FSA money if I leave my job mid-year?

You lose access to the FSA immediately. Any unspent balance is forfeited, even if you have not reached the end of the plan year. You do not get a refund. If you are leaving your job, spend down your FSA balance before your last day if possible. An HSA, by contrast, goes with you when you leave.

Can I use HSA money for my spouse or children?

Yes. HSA money can pay for may have access to medical expenses of you, your spouse, and your dependents, even if they are not on your health plan. FSA money works the same way—it covers family members' medical costs. Both accounts require that the person receiving care be claimed as a dependent on your tax return or be your spouse.

What if I do not spend all my HSA money by the end of the year?

Nothing happens—it stays in your account. HSA money does not expire. You can let it accumulate for years, decades, or your entire life. After age 65, you can withdraw HSA money for any reason, though non-medical withdrawals are taxed as regular income. This makes HSAs a powerful retirement savings tool.

Can I withdraw HSA money for non-medical reasons?

Yes, but there is a penalty. Before age 65, if you withdraw HSA money for something other than a may have access to medical expense, you pay income tax on the withdrawal plus a 20 percent penalty. After age 65, you can withdraw money for any reason without the penalty, but you still pay income tax on non-medical withdrawals. This is different from an FSA, which can only be used for medical expenses.