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 during your employer's open enrollment period, and that money comes out of your paycheck before taxes are calculated. When you have a medical bill—copays, deductibles, prescriptions, dental work, vision care—you submit a receipt to your FSA administrator and they reimburse you from your account.

The main advantage is the tax savings. Because FSA contributions reduce your taxable income, you pay less in federal income tax, Social Security tax, and Medicare tax. If you spend $2,400 on medical expenses in a year and contribute that amount to an FSA, you avoid taxes on that $2,400. For someone in the 22% federal tax bracket, that's roughly $528 in tax savings, plus additional savings on payroll taxes.

FSAs are different from Health Savings Accounts (HSAs) in one critical way: FSAs are "use it or lose it." Money you don't spend by the end of the plan year (usually December 31) goes back to your employer. Some plans offer a grace period of up to 2.5 months into the next year, or let you carry over up to $610 (the amount changes yearly), but most do not. This means you need to estimate carefully how much medical spending you'll actually have.

Key Takeaways

  • FSA contributions come from your paycheck before taxes, reducing what you owe in federal income tax and payroll taxes.
  • You can use FSA money for copays, deductibles, prescriptions, dental, vision, and other may have access to medical expenses—but not health insurance premiums or cosmetic procedures.
  • Money left in your FSA at the end of the plan year is forfeited unless your employer offers a grace period or carryover option.
  • You must enroll during your employer's open enrollment window, usually once per year, and cannot change your contribution mid-year unless you have a may have access to life event.
  • FSAs are only available through employers; you cannot open one on your own.

How much you can contribute and when

The IRS sets an annual limit on FSA contributions. For 2024, the limit is $3,200 per year. This limit changes occasionally, so check with your employer or FSA administrator for the current year's cap. You decide your contribution amount during open enrollment, which is typically in the fall for a plan year starting January 1.

Once you choose an amount, you're locked in for the entire plan year. You cannot increase or decrease your contribution unless you experience a may have access to life event—marriage, divorce, birth of a child, loss of other health coverage, or a significant change in your spouse's benefits. Even then, you can only change your contribution to match the change in your life circumstances, not to any amount you want.

The money is deducted from your paycheck in equal installments throughout the year. If you contribute $2,400, you'll see roughly $200 deducted from each monthly paycheck (before taxes). Your employer may also contribute to your FSA, though this is less common than with HSAs.

What medical expenses you can pay with FSA money

FSAs cover a broad range of may have access to medical expenses. These include copays and coinsurance, deductibles, prescription medications, over-the-counter drugs (with a prescription from your doctor), dental work, vision care and glasses, hearing aids, mental health treatment, and physical therapy. You can also use FSA funds for certain medical equipment like crutches, wheelchairs, and blood pressure monitors.

What you cannot use FSA money for: health insurance premiums (with rare exceptions), cosmetic procedures, gym memberships, vitamins without a medical condition diagnosis, and most over-the-counter items without a prescription. The IRS maintains a detailed list of may have access to expenses, and your FSA administrator can tell you whether a specific item qualifies before you spend the money.

One practical note: if you're unsure whether something qualifies, ask your FSA administrator in writing before you buy it. Getting reimbursement denied after you've already paid out of pocket is frustrating and wastes money you set aside for medical care.

How to get reimbursed from your FSA

The reimbursement process varies by FSA administrator, but the basic steps are the same. You pay for a medical expense out of pocket, then submit a claim to your FSA administrator with proof of the expense—usually an itemized receipt from the provider or pharmacy showing what was charged and what you paid.

Most FSA administrators now offer online portals or mobile apps where you can upload receipts and track your balance. Some still accept paper claims by mail. Processing typically takes one to two weeks. Once approved, the money is deposited into your bank account or sent as a check.

Some FSAs issue a debit card that you can use directly at pharmacies, doctors' offices, and other medical providers. This eliminates the need to submit receipts for every small purchase. However, you may still need to provide documentation if the card is used at a merchant that also sells non-medical items (like a grocery store with a pharmacy).

The "use it or lose it" rule and how to plan around it

This is the biggest risk with FSAs. Any money left in your account at the end of the plan year is forfeited—your employer keeps it. This creates a real incentive to estimate your medical spending accurately. If you guess too high, you lose money. If you guess too low, you miss out on tax savings.

To estimate wisely, look at your medical spending from the past two or three years. Add up copays, prescriptions, dental work, and vision care. If you know you'll need a procedure or start a new medication, factor that in. If you're healthy and rarely see a doctor, a lower contribution makes sense. If you have chronic conditions or wear glasses and braces, a higher contribution is justified.

Some employers offer a grace period of up to 2.5 months into the next calendar year to spend remaining FSA funds. Others allow you to carry over up to $610 (this amount is adjusted yearly by the IRS) into the next plan year. Ask your employer which option, if any, your plan offers. If neither applies, any unspent money is gone.

FSA vs. HSA: which is right for you

Both FSAs and HSAs offer tax savings on medical expenses, but they work differently. An HSA is only available if you have a high-deductible health plan (HDHP), while an FSA works with any health plan. HSAs let you carry money over year to year and even invest it for growth, while FSAs are use-it-or-lose-it. HSAs have higher contribution limits ($4,150 for individual coverage in 2024, $8,300 for family coverage).

If your employer offers both, an HSA is generally the better choice because you keep the money and can invest it. But if you only have access to an FSA, or if you have a traditional health plan that doesn't may have access to for an HSA, an FSA is still valuable for the tax savings. If you're unsure which plan your employer offers, check your benefits materials or ask your HR department.

Common mistakes to avoid with FSAs

The most common mistake is overestimating how much you'll spend and losing money at year-end. The second is underestimating and missing out on tax savings. Both are avoidable with honest math about your actual medical spending.

Another mistake is forgetting to submit receipts. If you use an FSA debit card, keep your receipts anyway—your administrator may ask for them later to verify the expense was medical. If you pay out of pocket and forget to submit a claim within the deadline (usually 90 days to a year after the expense, depending on your plan), you forfeit reimbursement.

A third mistake is assuming you can change your contribution mid-year. You cannot, except for may have access to life events. If you contribute $3,000 and realize by March that you won't spend it, you're stuck. Plan carefully at enrollment time.

Frequently Asked Questions

Can I use my FSA for my spouse or children?

Yes, if they are covered under your health plan. You can use FSA funds to pay for medical expenses for yourself, your spouse, and any dependents claimed on your tax return. The expenses must be for may have access to medical care, but the person receiving the care doesn't have to be the account holder.

What happens to my FSA if I leave my job?

You lose access to the account immediately. Any unspent money is forfeited to your employer. However, you may be able to continue FSA coverage through COBRA (Consolidated Omnibus Budget Reconciliation Act) if your employer offers it, though you'll pay the full premium yourself. Check with your HR department about your options before you leave.

Can I get reimbursed for expenses from before I enrolled in the FSA?

No. You can only be reimbursed for expenses incurred after your FSA coverage begins. If you had medical bills before your plan year started, you cannot use FSA funds for them, even if you submit the claim during the plan year.

Do I need receipts for every FSA purchase?

Yes, your FSA administrator will ask for proof of the expense. If you use an FSA debit card, keep receipts in case you're asked to verify the purchase later. If you pay out of pocket, submit the receipt with your reimbursement claim. Itemized receipts showing what was purchased and what you paid are best.

Can I contribute to both an FSA and an HSA?

No. If you have an HSA, you cannot also have an FSA (with limited exceptions for dependent care FSAs). The IRS treats them as overlapping benefits. If your employer offers both, you must choose one during enrollment.