An FSA is not a medical savings account — it's a different type of account with stricter rules

A Flexible Spending Account (FSA) and a Health Savings Account (HSA) are often confused because both let you set aside pre-tax money for medical costs. But they work differently and have different limits, rules about what you can carry over, and who can open one. An FSA is an employer-sponsored account where you decide how much to contribute each year, but you lose any money you don't spend by the end of the plan year — with limited exceptions. An HSA is a personal savings account you own, it rolls over year to year, and you can invest the money. Understanding which one you have (or which one you're may be able to access for) matters because the rules about spending and keeping your money are not the same.

Key Takeaways

  • An FSA is employer-sponsored and has a "use it or lose it" rule — unspent money typically goes back to your employer at the end of the year, though some plans offer a grace period or carryover of up to $610.
  • An HSA is a personal account you own, money rolls over indefinitely, and you can invest it like a retirement account if your balance grows large enough.
  • You can only open an HSA if you're enrolled in a high-deductible health plan (HDHP); FSA may be able to access depends on your employer offering one.
  • Both accounts use pre-tax money, but FSA contribution limits are set by your employer (up to $3,300 for 2024), while HSA limits are higher and set by federal law.
  • The IRS publishes a list of what counts as a may have access to medical cost for both accounts, and the list is the same — but how you can spend the money differs based on account type.

How an FSA works and what happens to unspent money

When you enroll in an FSA through your employer, you choose a dollar amount to contribute each pay period. That money comes out of your paycheck before taxes, which lowers your taxable income for the year. You can then use a debit card or submit receipts to get reimbursed for may have access to medical costs — copays, deductibles, prescription drugs, dental work, vision care, and many other expenses. The catch is the "use it or lose it" rule: if you don't spend all the money by the end of the plan year (usually December 31), you forfeit what's left.

However, some employers now offer a grace period or a carryover option. A grace period typically gives you an extra 2.5 months (into March) to spend money from the previous year. A carryover lets you roll up to $610 (for 2024) into the next year. Not all employers offer either option, so check your plan documents or ask your benefits administrator which applies to you. If your plan has neither, you need to estimate carefully how much you'll spend in medical costs during the year, because overestimating means losing money.

How an HSA works and how it differs from an FSA

An HSA is a personal savings account you own and control, even if your employer helps you set one up. Money you contribute is pre-tax (either through payroll deduction or a direct deposit), and it rolls over year after year — there is no "use it or lose it" rule. You can withdraw money tax-free to pay for may have access to medical costs, just like an FSA. But you can also leave the money in the account and let it grow, and once you turn 65, you can withdraw it for any reason (though non-medical withdrawals are taxed as income).

The main catch is that you can only open an HSA if you're enrolled in a high-deductible health plan (HDHP) — a health insurance plan with a deductible of at least $1,600 for individual coverage or $3,200 for family coverage (2024 amounts). If your employer offers a traditional PPO or HMO plan, you're not may be able to access for an HSA. You also cannot be claimed as a dependent on someone else's tax return, and you cannot be enrolled in Medicare. For 2024, you can contribute up to $4,150 to an individual HSA or $8,300 to a family HSA, and these limits are higher than FSA limits.

may have access to medical costs are the same for both accounts

The IRS maintains a list of what counts as a may have access to medical cost, and that list applies to both FSAs and HSAs. may have access to expenses include copays and coinsurance, deductibles, prescription medications, dental and vision care, mental health treatment, physical therapy, and many over-the-counter items like pain relievers and allergy medicine (though you typically need a prescription or doctor's note for OTC items in an FSA). Costs that don't count include cosmetic procedures, gym memberships, and general wellness products.

The difference is not what you can buy — it's how you can spend the money. With an FSA, you have to spend it within the plan year or lose it (unless your plan has a grace period or carryover). With an HSA, you can spend it whenever you want, or not spend it at all and let it grow. This makes an HSA more flexible if you're not sure how much medical care you'll need in a given year.

Contribution limits and how they affect your taxes

FSA contribution limits are set by your employer but capped by federal law. For 2024, the maximum is $3,300 per year. Your employer may set a lower limit. The money comes out of your paycheck before federal income tax, Social Security tax, and Medicare tax, which reduces your taxable income and your take-home pay.

HSA contribution limits are higher and set by federal law, not your employer. For 2024, you can contribute up to $4,150 for individual coverage or $8,300 for family coverage. If you're 55 or older, you can add an extra $1,000 per year (a "catch-up" contribution). Like an FSA, the money is pre-tax and reduces your taxable income. But because HSA money rolls over and can be invested, the long-term tax benefit is often larger — you're not just avoiding taxes on the contribution, you're also avoiding taxes on any growth or interest the account earns.

Who can open each type of account

An FSA is available only if your employer offers one. Not all employers do, and there's no way to open an FSA on your own. If your employer offers one, you can enroll during the open enrollment period (usually in the fall for coverage starting January 1). Self-employed people cannot open an FSA.

An HSA requires two things: enrollment in an HDHP and may be able to access to open the account (you can't be on Medicare, can't be claimed as a dependent, and can't be covered by another health plan that isn't an HDHP). If you meet those requirements, you can open an HSA through a bank, credit union, or investment company — you don't need your employer to offer one. Some employers do offer HSAs and may contribute money to yours, but you can also open one independently. Self-employed people can open an HSA if they have an HDHP.

When to choose or use each account

If your employer offers both an FSA and an HSA, the choice depends on your situation. Choose an FSA if you have predictable medical costs each year (regular prescriptions, ongoing therapy, dental work) and you're confident you'll spend the money. The tax break is immediate and straightforward. Choose an HSA if you want flexibility, if you're generally healthy and don't expect large medical costs, or if you want to build a long-term savings cushion for future medical care. An HSA also makes sense if you're self-employed or if you change jobs frequently, because you own the account and it moves with you.

Some people open both accounts if their employer allows it — they use the FSA for predictable costs and let the HSA grow as a backup. However, you cannot claim the same expense on both accounts; each dollar of medical cost can only be reimbursed once.

Frequently Asked Questions

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

You lose access to the account. FSA money is owned by your employer, not by you, so when you leave the job, you forfeit any remaining balance. You have a limited window (usually 60 days) to submit claims for expenses you incurred while employed, but new expenses don't count. An HSA, by contrast, goes with you — you own it and can take it to a new employer or keep it open independently.

Can I use my FSA or HSA to pay for health insurance premiums?

Not directly. You cannot use FSA or HSA money to pay premiums for your regular health insurance. However, you can use both accounts to pay premiums for long-term care insurance, COBRA continuation coverage, and health insurance you buy while unemployed. Check your plan documents or ask your benefits administrator about the specific rules for your account.

Do I have to submit receipts every time I use my FSA debit card?

Not always. Many FSA debit cards work without requiring a receipt for small purchases, especially at pharmacies and medical offices. However, your plan administrator may ask for receipts later to verify the expense was may have access to. Keep receipts for at least three years in case you're audited. With an HSA, the rules are similar — you don't always need a receipt at the point of purchase, but you should keep them for your records.

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

No. FSA money typically sits in a low-interest account or on a debit card. You cannot invest it in stocks, bonds, or mutual funds. An HSA, once the balance reaches a certain threshold (often $1,000 to $2,500, depending on the provider), can be invested like a brokerage account. This is one of the biggest differences between the two accounts over time.

What if I don't spend all my FSA money and my plan doesn't have a grace period or carryover?

The unspent balance goes back to your employer. You cannot get it back or roll it over to next year. This is why estimating your medical costs carefully is important. If you're unsure, it's safer to contribute a lower amount and add more next year if you need to.