What a Healthcare Flexible Spending Account Is

A healthcare flexible spending account (FSA) is a workplace benefit that lets you set aside pre-tax money to pay for medical expenses. You choose how much to contribute each year, your employer deducts it from your paycheck before taxes are calculated, and you use the money to pay for may be able to access medical costs—copays, deductibles, prescriptions, dental work, vision care, and other out-of-pocket expenses. The tax savings come from not paying federal income tax, Social Security tax, or Medicare tax on the money you set aside.

The catch is the use-it-or-lose-it rule: money you don't spend by the end of the plan year (usually December 31) goes back to your employer. You don't get it back. This is the biggest difference between an FSA and an HSA, which lets you carry unused money forward indefinitely. Because of this rule, you need to estimate carefully how much medical spending you'll actually have.

FSAs are offered by employers, not purchased on your own. If your workplace offers one, you enroll during open enrollment, usually once a year. If your employer doesn't offer an FSA, you cannot get one—there is no individual FSA market.

Key Takeaways

  • You contribute pre-tax money to an FSA through payroll deduction, which lowers your taxable income and saves you money on federal, Social Security, and Medicare taxes.
  • Money left unspent at the end of the plan year is forfeited—you cannot roll it over or get it back, so you must estimate your medical expenses carefully.
  • FSAs cover copays, deductibles, prescriptions, dental, vision, and many other out-of-pocket medical costs, but not health insurance premiums or cosmetic procedures.
  • You access FSA money through a debit card, reimbursement request, or direct payment to providers, depending on how your employer's plan is set up.
  • FSAs are only available through employers; you cannot open one on your own, and you can only enroll during your workplace's open enrollment period.

How Much You Can Contribute and Tax Savings

The IRS sets an annual contribution limit for FSAs. For 2024, the limit is $3,200 per person per year. This limit changes occasionally, so check with your employer or the IRS website if you're planning for a future year. You decide how much to contribute within that limit, and your employer deducts it evenly from each paycheck across the plan year.

The tax savings depend on your income and tax bracket. If you contribute $2,000 to an FSA, you avoid paying federal income tax, Social Security tax (6.2%), and Medicare tax (1.45%) on that $2,000. For someone in the 22% federal tax bracket, that's roughly $440 in tax savings on a $2,000 contribution, plus another $150 or so in payroll taxes—a total of about $590 in savings. The lower your tax bracket, the smaller the savings; the higher your bracket, the larger.

This tax advantage only works if you actually spend the money. If you contribute $2,000 and spend only $1,200, you lose the tax benefit on the $800 you didn't use, and you lose the $800 itself.

What Expenses an FSA Covers

FSAs cover most out-of-pocket medical, dental, and vision expenses. This includes copays and coinsurance (your share of the cost after insurance pays), deductibles, prescription medications, over-the-counter medications (with a prescription from your doctor), dental work, eyeglasses, contact lenses, hearing aids, and medical equipment like crutches or blood pressure monitors. You can also use FSA money for certain preventive care and mental health services.

FSAs do not cover health insurance premiums, cosmetic procedures (like teeth whitening or elective surgery), or expenses that your health insurance already paid for. Some items sit in a gray area—ask your plan administrator or check your plan documents before spending FSA money on something unusual, like acupuncture or a gym membership marketed as medical.

The IRS maintains a detailed list of may be able to access expenses. If you're unsure whether something qualifies, your employer's benefits team or the FSA provider can tell you before you spend the money.

How to Access and Use FSA Money

Most employers offer FSA money through a debit card linked to your account. You swipe it at the pharmacy, doctor's office, or medical supplier just like a regular debit card. Some plans require you to submit a reimbursement request instead—you pay out of pocket and then send a receipt to your FSA administrator, who deposits the money back into your account or sends you a check. A few plans let you pay providers directly, and the provider bills your FSA account.

The debit card method is fastest because you don't have to wait for reimbursement. However, some FSA administrators require you to submit receipts even when you use the card, especially for large purchases or items that might not be obviously medical. Keep receipts for at least three years in case your FSA administrator asks for proof that the expense was may be able to access.

You can access your FSA balance through an online portal or mobile app provided by your plan administrator. This lets you check how much you have left and track your spending throughout the year.

The Use-It-or-Lose-It Rule and Carryover Options

Money you don't spend by the end of the plan year is forfeited. This is the rule that makes FSA planning difficult. If you contribute $2,500 and spend only $2,000, you lose the $500. Your employer keeps it; you don't get a refund, and it doesn't roll over to next year.

Some employers offer a grace period of up to 2.5 months after the plan year ends (so until mid-March if your plan year ends December 31). During the grace period, you can still spend down your FSA balance. Not all employers offer this, so check your plan documents.

A few employers also offer a carryover option that lets you carry up to $640 (for 2024) of unused FSA money into the next plan year. This is less common than the grace period, and employers can choose whether to offer it. If your employer offers both a grace period and a carryover, you can use the grace period first, then carry over any remaining balance up to the limit.

FSA vs. HSA: When to Choose Each

If you have access to both an FSA and an HSA through your employer, the choice depends on your health spending and job stability. An HSA is better if you expect to have low medical expenses in the near term, because unused money rolls over forever and grows tax-free. An FSA is better if you know you'll have significant medical expenses this year—dental work, vision correction, or ongoing prescriptions—because you can use all the money you contribute without worrying about carrying it over.

FSAs are also better if you're not sure how long you'll stay at your job. When you leave an employer, your FSA balance is forfeited—you cannot take it with you or roll it into an HSA. If you're planning to change jobs soon, contributing to an FSA is riskier because you might lose unspent money.

Some employers let you enroll in both an FSA and an HSA in the same year, but the rules are complex. If you do, you can only use the HSA for expenses, not the FSA, until you've met your HSA deductible. Talk to your benefits team before enrolling in both.

Enrollment, Changes, and Life Events

You enroll in an FSA during your employer's open enrollment period, which is usually once a year in the fall or early winter. You choose your contribution amount and confirm your election. Once the plan year starts, you cannot change your contribution unless you have a may have access to life event—marriage, divorce, birth or adoption of a child, loss of other health coverage, or a significant change in your spouse's benefits.

If you experience a may have access to life event, you typically have 30 to 60 days to notify your employer and request a change to your FSA contribution. The change takes effect the month after you request it, not retroactively. If you lose your job or your employer ends the FSA plan, you can access any remaining FSA balance through the end of the plan year, but you cannot contribute more.

If you leave your job mid-year, your FSA contributions stop, but you can still use any balance you've already accumulated through the end of that plan year. After that, the balance is forfeited. Some employers offer COBRA continuation for FSAs, which lets you keep the FSA for a limited time after you leave, but you have to pay the full contribution yourself (no employer subsidy).

Common Mistakes and How to Avoid Them

The most common mistake is overestimating how much you'll spend and losing money at year-end. To avoid this, track your actual medical spending from the past two or three years, add up copays, prescriptions, and other out-of-pocket costs, and use that as a baseline. If you're unsure, contribute less rather than more—you can always increase your contribution next year.

Another mistake is forgetting to submit receipts or losing them. Keep all receipts for FSA purchases, even if you used the debit card. Your FSA administrator may ask for proof that an expense was may be able to access, and without a receipt, you might have to repay the money out of pocket. Store receipts digitally or in a folder so you can find them quickly.

A third mistake is not using the grace period or carryover option if your employer offers it. If you have $300 left in your FSA in December and your employer offers a grace period, you have until mid-March to spend it. Use that time to stock up on may be able to access items like over-the-counter pain relievers, allergy medications, or first-aid supplies.

Frequently Asked Questions

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

Your FSA balance is forfeited when you leave your employer. You cannot take it with you, roll it into an HSA, or get a refund. You can use any remaining balance through the end of the current plan year, but after that, it's gone. Some employers offer COBRA for FSAs, which lets you continue the account for a limited time, but you pay the full contribution yourself.

Can I use my FSA to pay for my spouse's or child's medical expenses?

Yes. FSA money can be used for may be able to access medical expenses of you, your spouse, and your dependents, regardless of whether they're covered under your health insurance plan. You don't need to be on the same insurance policy to use FSA money for their care.

Can I buy over-the-counter medications with my FSA?

Over-the-counter medications require a prescription from your doctor to be FSA-may be able to access. Aspirin, cold medicine, allergy pills, and other OTC drugs are covered only if your doctor writes a prescription for them. Vitamins and supplements are generally not covered unless prescribed for a specific medical condition.

What if I don't spend all my FSA money by the end of the year?

Unspent money is forfeited. However, if your employer offers a grace period (usually until mid-March), you can spend it down during that time. If your employer offers a carryover option, you can carry forward up to $640 (for 2024) into the next plan year. Check your plan documents to see which options your employer offers.

Can I enroll in an FSA if my employer doesn't offer one?

No. FSAs are only available through employers. If your workplace doesn't offer an FSA, you cannot open one on your own. If you have a high-deductible health plan, you may be able to open an HSA instead, which offers similar tax advantages and more flexibility with unused money.