A Flexible Spending Account lets you set aside pre-tax money from your paycheck to pay for medical expenses your insurance doesn't cover

A Flexible Spending Account (FSA) is an employer-sponsored plan where you contribute money before taxes are taken out, then use that money to pay for may have access to medical, dental, and vision expenses. The money comes directly from your paycheck, so you never see it as taxable income. You decide how much to contribute each year during your employer's open enrollment period, and that amount is set until the next enrollment window — usually once per year.

The main trade-off is the "use it or lose it" rule: money you don't spend by the end of the plan year generally cannot be carried forward. Some employers offer a grace period of up to 2.5 months into the next year, or let you carry over up to $640 (this limit changes annually), but most do not. This means you need to estimate carefully what you'll actually spend.

FSAs are different from Health Savings Accounts (HSAs) because they don't require a high-deductible health plan, they're not portable if you change jobs, and the contribution limits are lower. But they work well if you have predictable medical costs or know you'll need dental work in the coming year.

Key Takeaways

  • You contribute pre-tax money through payroll deduction, which reduces your taxable income and the taxes you owe that year.
  • You can use FSA funds to pay for copays, deductibles, prescriptions, dental work, vision care, and many over-the-counter medical items — but not health insurance premiums or cosmetic procedures.
  • Money left unspent at the end of the plan year is forfeited unless your employer offers a grace period or carryover option.
  • FSA funds are held in an account you access through a debit card, online portal, or reimbursement requests, depending on your plan.
  • You must enroll during your employer's open enrollment period; you cannot start or change your FSA outside that window unless you have a may have access to life event.

What expenses you can and cannot pay for with FSA money

FSA funds cover most medical, dental, and vision costs that your insurance doesn't fully pay. This includes copays and coinsurance, deductibles, prescription medications, glasses and contact lenses, dental cleanings and fillings, orthodontia, hearing aids, and many over-the-counter items like pain relievers, allergy medicine, and first-aid supplies. The IRS publishes a detailed list of may have access to expenses, and most everyday healthcare costs fall into it.

You cannot use FSA money for health insurance premiums, cosmetic procedures (like teeth whitening or Botox), gym memberships, vitamins, or anything considered a general wellness product rather than treatment for a specific condition. Long-term care insurance and certain other insurance products are also off-limits. If you're unsure whether something qualifies, your plan administrator or the IRS website can confirm before you spend the money.

How much you can contribute and how the tax savings work

The IRS sets an annual contribution limit for FSAs, which changes each year. For 2024, the limit is $3,300; for 2025, it is $3,300. You choose your contribution amount during open enrollment, and that money is deducted from your paycheck in equal installments throughout the year. Because the money is taken out before federal income tax, Social Security tax, and Medicare tax are calculated, you pay less in taxes overall.

The tax savings depend on your tax bracket. If you're in the 22% federal tax bracket and contribute $2,000 to an FSA, you save roughly $440 in federal taxes alone, plus state and payroll taxes in most states. That's money back in your pocket simply by using pre-tax dollars for expenses you'd pay for anyway. However, this benefit only works if you actually spend the money you contribute — unspent funds are lost.

How to access and use your FSA funds

Most employers provide an FSA debit card that you can use at pharmacies, doctors' offices, and other healthcare providers. The card is linked to your FSA balance, and you swipe it like a regular debit card. Some providers will ask you to submit a receipt or explanation of benefits afterward to confirm the expense was may have access to; this is called substantiation, and it's a normal part of the process.

If your employer doesn't provide a debit card, you pay out of pocket and then submit a reimbursement request to your plan administrator. You'll need to include a receipt or itemized bill showing what you paid for. Reimbursement typically takes one to two weeks. Some employers also offer an online portal where you can check your balance, upload receipts, and track spending in real time.

You can only access your FSA funds for may have access to expenses. If you try to use the card for something that doesn't may have access to — like groceries or gas — the transaction will be declined or flagged for review. Keep receipts for all FSA purchases in case your plan administrator asks for proof that the expense was legitimate.

The "use it or lose it" rule and how to avoid losing money

At the end of each plan year, any money left in your FSA that you haven't spent is forfeited. You cannot roll it over to the next year, carry it in a personal account, or get it refunded. This is a hard rule set by the IRS, and it applies to almost all FSAs. The only exceptions are if your employer offers a grace period (up to 2.5 months into the next year to spend the previous year's balance) or a carryover option (up to $640 per year, depending on your plan).

To avoid losing money, estimate conservatively. Look at your medical expenses from the past two years: copays, prescriptions, dental visits, vision care, and any planned procedures. Add a small buffer for unexpected costs, but don't over-contribute hoping you'll find ways to spend it. If you're unsure, start with a lower amount and increase it next year once you see how much you actually spend. Some employers also let you change your contribution if you have a may have access to life event, such as a change in family size, loss of coverage, or a significant change in healthcare costs.

FSA enrollment, timing, and what happens if you change jobs

You can only enroll in an FSA during your employer's open enrollment period, which is usually once per year in the fall for coverage starting January 1. If you miss the window, you cannot start an FSA until the next enrollment period unless you have a may have access to life event: marriage, divorce, birth or adoption of a child, loss of health coverage, or a significant change in your spouse's benefits. Your employer's human resources or benefits department can tell you the exact dates and whether your situation qualifies for a mid-year change.

If you leave your job, your FSA coverage ends, and you lose access to any remaining balance in the account — even if you have a grace period or carryover option. You cannot transfer FSA funds to a new employer's plan. This is one reason to be conservative with FSA contributions if you think you might change jobs during the year. Some employers offer COBRA continuation of FSA coverage for a limited time, but this is rare and you would have to pay the full premium yourself.

FSA versus HSA: which one makes sense for you

An FSA and an HSA are both tax-advantaged accounts for medical expenses, but they work differently and have different rules. An FSA is available to anyone with employer health coverage, has a lower contribution limit, and follows the use-it-or-lose-it rule. An HSA requires enrollment in a high-deductible health plan, has a higher contribution limit, lets you roll over unused money year to year, and is portable if you change jobs. HSAs also let you invest the money and withdraw it tax-free in retirement for any expense, not just medical.

If your employer offers both, choose based on your situation. An FSA makes sense if you have predictable medical expenses you know you'll spend, you don't have a high-deductible plan, or you want the simplicity of a lower contribution limit. An HSA makes sense if you're in a high-deductible plan, you want to build savings over time, or you think you might change jobs. Some people use both: an HSA for long-term savings and an FSA to cover this year's known expenses. Check with your employer about whether you're allowed to enroll in both.

Frequently Asked Questions

Can I use my FSA debit card at any store, or only at pharmacies and doctors?

FSA debit cards work only at healthcare providers, pharmacies, and medical suppliers. You cannot use it at grocery stores or general retailers, even if they sell over-the-counter medical items. Some stores have separate pharmacy sections where the card will work, but the main store checkout will decline it. If you buy may have access to items at a store that accepts the card, keep your receipt to prove the purchase was medical.

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

Unspent FSA money is forfeited and goes back to your employer or the insurance company — you lose it. Some employers offer a grace period of up to 2.5 months into the next year, or let you carry over up to $640, but most do not. Check your plan documents or ask your benefits department whether your FSA has either option. If not, spend or lose the money by December 31.

Can I change my FSA contribution amount during the year?

No, unless you have a may have access to life event such as marriage, birth, adoption, loss of coverage, or a significant change in your spouse's benefits. Outside of these events, your contribution amount is locked in for the entire plan year. If you realize you contributed too much or too little, you'll have to wait until next year's open enrollment to adjust it.

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

Not always. Many transactions are automatically approved, especially at pharmacies and doctor's offices. However, your plan administrator may randomly request receipts to verify that expenses were may have access to. Keep all receipts for at least three years in case you're asked to provide proof. If you don't submit a receipt when requested, the transaction may be reversed and the money returned to your account.

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

Yes. FSA funds can be used for may have access to 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 the one receiving the care — you just need to be the account holder and the expense needs to be may have access to.