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

A Flexible Spending Account (FSA) is a way to use money before taxes are taken out to pay for certain out-of-pocket health and care expenses. Your employer takes the amount you choose directly from your paycheck across the year, reduces your taxable income, and puts that money into an account you control. You then submit receipts or use a debit card to withdraw money for covered expenses. The main trade-off: money you don't spend by the end of the plan year is forfeited — you cannot roll it over or get it back.

FSAs come in two types. A medical FSA covers copays, deductibles, prescriptions, dental work, vision care, and other medical expenses your health insurance doesn't pay for. A dependent care FSA covers daycare, after-school programs, or adult day care for a dependent so you can work. Most employers offer one or both. The money sits in an account managed by a third-party administrator — not your employer directly — and you access it by submitting claims or using a debit card tied to the account.

Key Takeaways

  • You choose how much to contribute each year during open enrollment, and that amount is deducted from your paychecks before income tax is calculated, lowering your tax bill.
  • Medical FSAs typically reimburse copays, deductibles, prescriptions, dental, and vision expenses; dependent care FSAs cover daycare and adult care costs.
  • You must submit receipts or use a debit card to withdraw money, and the account administrator verifies that expenses are covered before paying out.
  • Any money left unspent at the end of the plan year is forfeited under the "use-it-or-lose-it" rule, though some employers offer a grace period or carryover of up to $610.
  • You can only enroll or change your contribution during open enrollment, unless you have a may have access to life event such as marriage, birth, or loss of coverage.

How money flows from your paycheck into the account

During your employer's open enrollment period — usually once a year in the fall — you decide how much to contribute to your FSA for the coming plan year. You submit this choice to your employer or the benefits administrator. The IRS sets a maximum contribution limit each year; for 2024, the medical FSA limit is $3,300 and the dependent care FSA limit is $5,000 per household (these limits change annually).

Once you enroll, your employer divides your annual contribution by the number of pay periods and deducts that amount from each paycheck before calculating income tax and Social Security tax. This reduces your taxable income for the year. For example, if you contribute $2,400 to a medical FSA and earn $50,000 annually, your taxable income drops to $47,600. The money goes into an account managed by a third-party administrator — companies like WageWorks, Conduent, or Fidelity — not directly to your employer.

You do not receive a lump sum or a debit card in the mail on day one. Instead, the administrator sets up your account and gives you access to claim reimbursement as you incur expenses throughout the year. Some administrators issue a debit card that you can use at pharmacies or medical providers; others require you to pay out of pocket and submit a claim for reimbursement later.

What expenses are covered and how to get reimbursed

A medical FSA covers a long list of out-of-pocket health costs. Copays and coinsurance are covered. Deductibles are covered. Prescription medications are covered. Dental work — fillings, crowns, orthodontia — is covered. Vision care including eye exams, glasses, and contact lenses is covered. Over-the-counter medications like pain relievers and allergy medicine are covered only if you have a prescription or a doctor's note. Insulin is always covered without a prescription. Therapy copays, medical equipment like crutches or blood pressure monitors, and hearing aids are all covered.

A dependent care FSA covers costs to care for a child under age 13 or a dependent adult so that you can work. Daycare centers, in-home nannies, after-school programs, and adult day care all may have access to. Summer camp is covered only if it is day camp; overnight camp is not. Babysitting for a night out does not may have access to because you are not working.

To get reimbursed, you have two paths depending on your administrator. If your account comes with a debit card, you can swipe it at a pharmacy or medical provider and the charge is deducted from your FSA balance on the spot — no paperwork required. If you do not have a debit card, or if the provider does not accept it, you pay out of pocket and then submit a claim. You upload a receipt or explanation of benefits to the administrator's website or mobile app, and they review it to confirm the expense is covered. Reimbursement typically arrives in your bank account within 5 to 10 business days.

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

Money left in your FSA at the end of the plan year does not roll over to the next year — it is forfeited. This is called the use-it-or-lose-it rule, and it is set by federal law. If you contribute $2,000 and spend only $1,500, the remaining $500 is gone. You cannot withdraw it, transfer it, or carry it forward. This rule exists because FSAs are tax-advantaged accounts; allowing unused money to roll over would let people accumulate large tax-free balances indefinitely.

Some employers soften this rule by offering a grace period or a carryover. A grace period gives you an extra 2.5 months after the plan year ends to spend money from the previous year. A carryover lets you roll up to $610 (for 2024) into the next year; any amount above that is still forfeited. Not all employers offer either option, so check your plan documents to see what applies to you.

To avoid losing money, estimate conservatively. Look back at what you actually spent on medical or dependent care in the past year, add a small buffer for unexpected costs, and contribute that amount. If you have a dependent care FSA, remember that the limit is per household, not per child — if you have two kids in daycare, the $5,000 limit covers both. If you are unsure whether an expense is covered, ask the administrator before you incur it; they can tell you whether a specific service or product qualifies.

When you can enroll, change, or stop contributing

You can enroll in an FSA only during your employer's open enrollment period, which typically happens once a year and lasts 30 to 45 days. If you miss open enrollment, you cannot enroll until the next year — there is no second chance. The exception is 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 dependent care costs. If a may have access to event occurs, you usually have 30 to 60 days to enroll or change your contribution.

Once you are enrolled, you are locked into your contribution amount for the entire plan year. You cannot increase or decrease it mid-year unless you have a may have access to life event. If your circumstances change — for example, your child starts school and you no longer need full-time daycare — you can request a change, but you will need to document the change with your employer or benefits administrator.

If you leave your job, your FSA coverage usually ends on your last day of employment. Any unused balance is forfeited. Some employers offer a limited window (often 60 days) to submit claims for expenses you incurred while employed, even if you submit the claim after you leave. Check with your former employer's benefits team to see what your important date is.

How FSAs compare to other tax-advantaged accounts

FSAs are often confused with Health Savings Accounts (HSAs) and Health Reimbursement Arrangements (HRAs), but they work differently. An HSA is a savings account you own and control; unused money rolls over indefinitely and you can invest it. An HRA is funded entirely by your employer; you do not contribute. An FSA is funded by you through payroll deduction and money is forfeited if unused. FSAs also have lower contribution limits than HSAs ($3,300 versus $4,150 for individual coverage in 2024).

The main advantage of an FSA over paying out of pocket is the tax savings. If you contribute $2,400 to a medical FSA and are in the 22% federal tax bracket, you save roughly $528 in federal income tax, plus state and local taxes and Social Security tax. That is real money. The main disadvantage is the use-it-or-lose-it rule — if you contribute too much and do not spend it, you lose the tax benefit and the money itself.

Common mistakes and how to avoid them

The biggest mistake is overestimating how much you will spend. People often think "I might need this" and contribute too much, then lose money at year-end. Be honest about what you actually spent in the past year, not what you think you might spend. If you have a dependent care FSA, remember that the amount covers only the months you actually use care — if your child is in daycare 10 months a year, do not contribute for 12.

A second mistake is not knowing what is covered. Over-the-counter medications are a common source of confusion — they are covered only with a prescription or doctor's note. Vitamins and supplements are not covered unless prescribed by a doctor. Cosmetic procedures are not covered. If you are unsure, ask the administrator before you buy or submit a claim.

A third mistake is missing the important date to submit claims. Most administrators require you to submit claims within 90 days to one year after the expense is incurred, depending on the plan. If you wait too long, the claim may be rejected and you lose the money. Keep receipts and submit claims promptly.

A fourth mistake is not updating your contribution if your life changes. If you have a child, get married, or change jobs, your FSA needs may shift. If you have a may have access to life event, contact your benefits administrator within 30 to 60 days to adjust your contribution for the next plan year.

Frequently Asked Questions

Can I use my FSA debit card at any store?

No. An FSA debit card works only at pharmacies, medical providers, and other merchants that accept FSA payments. You cannot use it at a grocery store or gas station. If you try to use it for a non-covered expense, the transaction will be declined. Some administrators require you to submit a receipt after you use the card to verify the expense is covered.

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

Your FSA coverage ends on your last day of employment, and any unused balance is forfeited. You may have a limited window (often 60 days) to submit claims for expenses you incurred while employed. After that, the account closes. You cannot transfer the balance to a new employer's FSA.

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

Yes, if your spouse is a dependent on your tax return. You can use your medical FSA to pay for your spouse's copays, prescriptions, dental work, and other covered expenses. The same rule applies to your children and any other tax dependents.

What if I do not spend all my FSA money by the end of the year?

The unused balance is forfeited unless your employer offers a grace period or carryover. A grace period gives you an extra 2.5 months to spend the money; a carryover lets you roll up to $610 into the next year. Check your plan documents to see which option, if any, your employer offers.

Can I enroll in an FSA if I am self-employed?

No. FSAs are offered only through employers. If you are self-employed, you can set up an HSA if you have a high-deductible health plan, or you can deduct medical expenses on your tax return if they exceed 7.5% of your adjusted gross income. Talk to a tax professional about which option works best for your situation.