An FSA and a medical savings account are not the same thing, though both let you set aside pretax money for health costs
A Flexible Spending Account (FSA) is an employer-sponsored plan where you contribute pretax dollars from your paycheck to cover medical, dental, and vision expenses. A Health Savings Account (HSA) is a medical savings account you own individually, tied to a high-deductible health insurance plan, and the money rolls over year to year. The key difference: FSA money is tied to your job and you lose what you don't spend each year. HSA money is yours to keep, grows tax-free, and follows you if you change jobs.
Both reduce your taxable income and let you pay for out-of-pocket health costs without paying federal income tax on that money. But the rules about what you can buy, how long you can keep the money, and who controls the account are completely different. Knowing which one you have—or which one you're choosing—matters because the wrong move costs you money you can't get back.
Key Takeaways
- FSA money comes from your paycheck through your employer and disappears at the end of the year if you don't spend it, while HSA money is yours to keep and grows year after year.
- An HSA requires enrollment in a high-deductible health plan, but an FSA works with any health insurance your employer offers.
- FSA contributions are capped at $3,300 per year (for 2024), while HSA limits are higher and vary by whether you have individual or family coverage.
- Both accounts cover the same types of medical expenses—copays, deductibles, prescriptions, dental, vision—but HSA money can be invested and used for retirement after age 65.
- If you change jobs, your FSA money stays with your old employer's plan, but your HSA travels with you.
How FSA money works and when you lose it
An FSA is a use-it-or-lose-it account. You decide at the start of the year how much to contribute—up to $3,300 for 2024—and that money is deducted from your paychecks before taxes. You can spend it on copays, deductibles, prescriptions, dental work, glasses, hearing aids, and other may have access to medical expenses. The money sits in an account managed by your employer's benefits administrator, and you access it with a debit card or by submitting receipts for reimbursement.
At the end of the plan year, any money you didn't spend is gone. Your employer keeps it. Some employers offer a grace period—usually two and a half months into the next year—where you can still spend the previous year's leftover funds, but this is optional and not all employers offer it. A few employers also allow a small carryover (usually $610 for 2024), but most do not. This is why FSA planning matters: you have to guess how much you'll spend on health costs in the next 12 months, and a wrong guess costs you real money.
How HSA money works and why it stays with you
An HSA is a medical savings account you own, not your employer. To open one, you must be enrolled in a high-deductible health plan (HDHP)—a type of insurance with lower premiums but higher deductibles. For 2024, a high-deductible plan means a deductible of at least $1,600 for individual coverage or $3,200 for family coverage. You can contribute up to $4,150 per year for individual coverage or $8,300 for family coverage, and you can contribute through your employer's payroll or on your own.
Unlike an FSA, HSA money rolls over every year. If you contribute $2,000 and spend $800, the remaining $1,200 stays in your account and earns interest or investment returns. You can let it grow for decades. When you change jobs, the HSA goes with you—it's your account, not your employer's. After age 65, you can withdraw HSA money for any reason without penalty, though non-medical withdrawals are taxed as income. This makes an HSA function like a retirement account if you don't need the money for health costs.
What expenses both accounts cover
Both FSAs and HSAs cover the same list of may have access to medical expenses under IRS rules. This includes copays and coinsurance, deductibles, prescription medications, dental work (fillings, cleanings, root canals), vision care (glasses, contacts, exams), hearing aids, mental health counseling, physical therapy, and many over-the-counter items like pain relievers and allergy medicine. You cannot use either account for cosmetic procedures, gym memberships, or general wellness products.
The IRS maintains a detailed list of what qualifies, and the rules are the same whether you're using FSA or HSA money. The difference is not what you can buy—it's what happens to the money if you don't buy anything.
Contribution limits and tax savings compared
| FSA (2024) | HSA (2024) | |
|---|---|---|
| Annual contribution limit | $3,300 | $4,150 (individual) / $8,300 (family) |
| Money rolls over year to year | No (use-it-or-lose-it) | Yes, indefinitely |
| Requires specific health plan | No, works with any plan | Yes, must have HDHP |
| Portable if you change jobs | No | Yes |
| Can invest the money | Usually no | Yes |
The tax savings from either account come from the same place: you avoid federal income tax, Social Security tax, and Medicare tax on the money you contribute. If you're in the 22% tax bracket and contribute $2,000 to an FSA, you save roughly $440 in taxes. The same contribution to an HSA saves the same amount. The difference is that FSA money disappears if you don't spend it, while HSA money stays and can grow.
HSA contribution limits are higher than FSA limits, which means you can set aside more money tax-free if you have a high-deductible plan. However, you're also responsible for paying more out of pocket before your insurance kicks in, so the higher limit reflects the higher deductible you're carrying.
When to choose FSA over HSA, and vice versa
Choose an FSA if you know you'll spend the money on medical costs this year. If you have regular prescriptions, dental work scheduled, or vision expenses coming up, an FSA lets you set aside money and use it immediately without worrying about investment returns or long-term growth. FSAs also work with any health insurance plan, so you're not locked into a high-deductible plan. If your employer offers both, an FSA is simpler if you have predictable health spending.
Choose an HSA if you can afford to pay medical costs out of pocket and let the account grow. HSAs make sense if you're young and healthy, have low medical expenses, and want to build a tax-free cushion for future health costs or retirement. If you're likely to change jobs, an HSA is better because it travels with you. If your employer offers a match or contribution to your HSA, that's assistance programs—take it. You can also have both an FSA and an HSA at the same time if your employer offers both, though there are coordination rules about which expenses you can claim from each.
What happens to your FSA or HSA when you leave your job
If you have an FSA and leave your job, the money in the account stays with your employer's plan. You can usually access it for a limited time (often 60 to 90 days) to submit claims for expenses you incurred while employed, but you cannot add new money or use it for future expenses. Any unspent balance is forfeited. This is one reason FSAs are riskier than HSAs—job changes can cost you money.
If you have an HSA and leave your job, the account is yours. You keep the money, can continue to use it, and can even continue to contribute to it if you're still enrolled in a high-deductible plan (through a spouse's employer, the marketplace, or Medicare). The HSA follows you to your next job, your next insurance plan, and into retirement. This portability is one of the biggest advantages of an HSA over an FSA.
Frequently Asked Questions
Can I have both an FSA and an HSA at the same time?
You can have both, but there are limits. If you have an FSA, you cannot contribute to an HSA in the same year unless the FSA is a limited-purpose FSA (which covers only dental and vision). If your employer offers both a regular FSA and an HSA, you have to choose one. Some employers offer a limited-purpose FSA alongside an HSA specifically to let you use both.
What happens if I contribute to an FSA and don't spend the money?
The money is forfeited at the end of the plan year. Some employers offer a grace period (usually 2.5 months into the next year) to spend leftover funds, or allow a small carryover (up to $610 for 2024), but most do not. This is why FSA planning is important—contribute only what you're confident you'll spend.
Can I use HSA money for my spouse or children?
Yes. HSA money can be used for may have access to medical expenses of you, your spouse, and your dependents, even if they're not covered under your high-deductible plan. FSA money works the same way—you can use it for family members' medical costs.
What if I enroll in Medicare? Can I still use my HSA?
Once you enroll in Medicare, you cannot contribute new money to an HSA. However, you can still withdraw money from an existing HSA for any reason without penalty after age 65, though non-medical withdrawals are taxed as income. You can also use HSA money to pay Medicare premiums and long-term care insurance.
Is an FSA the same as a Dependent Care FSA?
No. A Dependent Care FSA is a separate account for childcare and adult care expenses, with a different contribution limit ($5,000 per year for 2024). A medical FSA covers health expenses only. Some employers offer both, and you can contribute to each one in the same year.