What a Flexible Spending Account Is

A Flexible Spending Account (FSA) is a workplace benefit that lets you set aside pre-tax money to pay for medical and dependent care expenses. Your employer deducts the money from your paycheck before taxes are calculated, which lowers your taxable income for the year. You then use a debit card or submit receipts to withdraw that money and pay for may be able to access expenses.

FSAs are offered through your employer's benefits plan, usually during open enrollment in the fall. You choose how much to contribute each year—typically between $0 and a maximum set by the IRS (which changes annually). The money sits in an account managed by a third-party administrator, and you control when and how you spend it on covered medical or dependent care costs.

The main trade-off 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. Some plans offer a grace period of up to 2.5 months into the next year, or a carryover of up to $610 (as of 2024), but most do not. This means you need to estimate your expenses carefully before you commit.

Key Takeaways

  • FSA contributions come out of your paycheck before taxes, reducing what you owe to the IRS and increasing your take-home benefit.
  • You can use FSA money for copays, deductibles, prescriptions, dental work, vision care, and certain medical equipment—but not for health insurance premiums or over-the-counter items without a prescription.
  • Money left in your FSA at the end of the year is forfeited unless your plan offers a grace period or carryover option.
  • You enroll in an FSA once a year during your employer's open enrollment period, and your choice locks in for the entire plan year unless you have a may have access to life event.
  • FSAs are separate from Health Savings Accounts (HSAs) and work differently—you cannot have both at the same time if you are enrolled in a high-deductible health plan.

What Expenses You Can Pay For With an FSA

FSAs cover a broad range of medical and dental expenses. You can use the money for copays and coinsurance, deductibles, prescription medications, eyeglasses and contact lenses, dental cleanings and fillings, orthodontics, hearing aids, crutches, and certain medical equipment like blood pressure monitors or glucose meters. Mental health care, physical therapy, and chiropractic services are also covered if they are medically necessary.

Dependent care FSAs work differently: they cover childcare, adult day care, and elder care expenses that allow you to work. This includes daycare centers, nannies, after-school programs, and summer camps (but only the care portion, not tuition or education).

Over-the-counter items like pain relievers, cold medicine, and antacids are not covered unless you have a prescription from your doctor. Health insurance premiums, cosmetic procedures, and gym memberships do not may have access to. If you are unsure whether an expense is covered, your FSA administrator's website usually has a searchable list, or you can call them directly.

How Much You Can Contribute and When

The IRS sets an annual limit on how much you can contribute to a medical FSA. For 2024, the limit is $3,200; for 2025, it is $3,300. Your employer may set a lower limit, but cannot exceed the IRS maximum. Dependent care FSAs have a separate limit of $5,000 per household per year (or $2,500 if you are married and file taxes separately).

You choose your contribution amount during open enrollment, which typically happens once a year in the fall for a plan year that starts January 1. Once you enroll, 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 dependent care costs. A job change or loss of employment also qualifies.

Your contributions are spread evenly across your paychecks for the year. If you contribute $2,400 and are paid biweekly, you will have $100 deducted from each paycheck. The money goes into your FSA account immediately, so you can use it right away even though you have not yet paid the full amount through payroll deductions.

How to Use Your FSA Money

Most FSAs issue a debit card that you can swipe at pharmacies, doctors' offices, and medical suppliers. The card is linked to your FSA account, and the purchase is deducted automatically. For expenses where you cannot use the card—such as copays at a doctor's visit or out-of-pocket costs—you pay out of pocket and then submit a receipt to your FSA administrator for reimbursement.

Reimbursement usually takes one to two weeks after you submit your receipt. You will need the original receipt showing the date, the provider's name, the service or item purchased, and the amount paid. Your FSA administrator's website typically has a portal where you can upload receipts and track reimbursements.

Some FSAs require substantiation, meaning the administrator may ask you to prove that an expense was medically necessary before they reimburse it. This is less common now, but if your plan uses it, keep all receipts and medical documentation for at least three years.

The Use-It-or-Lose-It Rule and How to Plan Around It

Any money left in your FSA at the end of the plan year is forfeited—your employer keeps it. This is a hard rule set by federal tax law, and there are no exceptions. If you contribute $2,400 and spend only $1,800, you lose $600.

Some employers offer a grace period of up to 2.5 months into the next year (so through mid-March if your plan year ends December 31). During this time, you can spend down your remaining balance on may be able to access expenses. Other employers allow you to carry over up to $610 into the next year (the amount changes annually with inflation). Check your plan documents or ask your benefits administrator which option, if any, your employer offers.

To avoid losing money, estimate your medical and dependent care costs for the coming year. Include regular expenses like copays and prescriptions, plus any planned procedures or services. If you are uncertain, start with a conservative number—you can always increase your contribution next year. Some people use FSAs strategically by contributing just enough to cover predictable costs, while others skip them entirely if their expenses are unpredictable.

FSA vs. HSA: Key Differences

FSAs and HSAs are both tax-advantaged accounts for medical expenses, but they work very differently. An FSA is offered by your employer and has the use-it-or-lose-it rule. An HSA is a personal savings account that you own, and money rolls over year to year—there is no deadline to spend it.

You can only have an FSA if your employer offers one. You can only have an HSA if you are enrolled in a high-deductible health plan (HDHP), and you own the account even if your employer contributes to it. You cannot have both an FSA and an HSA at the same time; if you are in an HDHP, you must choose one or the other.

HSAs have lower annual contribution limits than FSAs ($4,150 for individual coverage in 2024, $8,300 for family coverage), but the money is yours to keep forever. FSAs have higher limits but you must spend the money or lose it. If your employer offers both, an HSA is usually the better choice because of the flexibility and the ability to save for future medical costs.

Enrollment, Changes, and What Happens When You Leave Your Job

You enroll in an FSA during your employer's open enrollment period, which is usually in October or November for a plan year starting January 1. You will receive information from your benefits department or HR, and you enroll through an online portal or paper form. Once you enroll, your contribution is locked in for the entire year.

If you have a may have access to life event—such as marriage, divorce, birth or adoption of a child, loss of other health coverage, or a change in your dependent care situation—you can change your FSA contribution within 30 to 60 days of the event (the exact window depends on your employer). You will need to provide documentation of the event, such as a birth certificate or marriage license.

If you leave your job, your FSA account ends. You have a limited time (usually 60 to 90 days) to submit any remaining receipts for reimbursement from expenses you incurred while you were employed. Any unspent balance is forfeited. If you move to a new job with an FSA, you start fresh with a new account and a new contribution election.

Frequently Asked Questions

Can I use my FSA debit card at any pharmacy or doctor's office?

Most pharmacies and medical providers accept FSA debit cards, but not all. Some smaller practices or specialty providers may not be set up to process them. If a provider does not accept the card, you can pay out of pocket and submit a receipt for reimbursement. Always keep receipts as backup.

What happens to my FSA money if I quit my job mid-year?

Your FSA account closes when you leave your employer. You can submit receipts for expenses you incurred while employed, but any unspent balance is forfeited. You do not get to take the money with you or roll it over to a new employer's plan.

Can I contribute to an FSA if I am self-employed?

No. FSAs are only available through an employer's benefits plan. If you are self-employed, you cannot set up an FSA. You may be able to open an HSA if you have a high-deductible health plan, or you can deduct certain medical expenses on your tax return.

How do I know if an expense is FSA-may be able to access?

Your FSA administrator maintains a list of may be able to access expenses on their website, usually searchable by category or keyword. You can also call their customer service line with a specific question. When in doubt, ask before you spend the money—some items like certain over-the-counter medications require a prescription to be FSA-may be able to access.

Can I change my FSA contribution amount during the year?

Only if you have a may have access to life event, such as marriage, divorce, birth, adoption, loss of other coverage, or a significant change in dependent care costs. A job change or loss of employment also qualifies. Outside of these events, your contribution is locked in until the next open enrollment period.