What an FSA is and how the money flows
A Flexible Spending Account (FSA) is a workplace benefit that lets you set aside pre-tax dollars to pay for may be able to access medical 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, reimbursement forms, or direct payment to draw from that account when you have a medical bill.
The money is held in an account managed by a third-party administrator—often the same company that handles your health insurance or a separate benefits firm. You decide how much to contribute each year during your employer's open enrollment period, and that amount is locked in until the next enrollment window (usually once per year). The account itself earns no interest; it is simply a holding tank for your pre-tax dollars.
Unlike a Health Savings Account (HSA), an FSA is tied to your job. If you leave your employer, you lose access to the account and any money remaining in it—with limited exceptions. The account is also "use it or lose it": money you do not spend by the end of the plan year or grace period is forfeited to your employer.
Key Takeaways
- You contribute pre-tax dollars through payroll deduction, which reduces your taxable income and the taxes you owe that year.
- FSA money can only be used for IRS-approved medical expenses: copays, deductibles, prescriptions, dental work, vision care, and certain medical equipment and supplies.
- You access the money using a debit card, submitting receipts for reimbursement, or paying providers directly from the account.
- Any money left unspent at the end of the plan year is forfeited; your employer keeps it, with rare exceptions for a grace period or carryover.
- If you leave your job, you lose the FSA and any remaining balance, though you may be able to use remaining funds for a short window after termination.
How much you can contribute and when
The IRS sets an annual contribution limit for FSAs, which changes most years. For 2024, the limit is $3,200 per person. Your employer may set a lower limit, but cannot exceed the IRS maximum. You choose your contribution amount during open enrollment—usually in October or November for a plan year starting January 1.
Once you elect an amount, you cannot change it mid-year 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. A job change or salary increase alone does not may have access to. If you try to change your election without a may have access to event, your employer's benefits administrator will deny the request.
The money is deducted from your paycheck in equal installments throughout the year. If you contribute $2,400, you will see roughly $200 deducted each month (before taxes). This reduces your gross income, which lowers your federal income tax, Social Security tax, and Medicare tax for that year.
What you can and cannot buy with FSA money
The IRS maintains a detailed list of may be able to access medical expenses. The broadest categories are copays and coinsurance for doctor visits, deductibles, prescription medications, dental work (fillings, cleanings, orthodontia), vision care (glasses, contacts, exams), and medical equipment (crutches, wheelchairs, blood glucose monitors). Mental health treatment, physical therapy, and chiropractic care are also covered if prescribed by a doctor.
Over-the-counter medications are may be able to access only if you have a prescription from a doctor—a simple note from your provider counts. Insulin is an exception and can be purchased without a prescription. Certain medical supplies like bandages, heating pads, and pregnancy tests are covered; others like cosmetic products, vitamins, and general wellness items are not.
Common ineligible expenses include gym memberships, cosmetic surgery, teeth whitening (cosmetic), hair loss treatments, and most over-the-counter items without a prescription. If you are unsure whether something qualifies, ask your FSA administrator or check the IRS Publication 502 before you spend the money—using FSA funds on ineligible expenses can trigger tax penalties.
How to access your FSA money
Most FSAs issue a debit card that works like a regular payment card at pharmacies, doctors' offices, and other medical providers. When you swipe it, the transaction is deducted from your FSA balance. Some administrators require you to submit a receipt or explanation of benefits (EOB) after the purchase to verify it was may be able to access; others do not. Check your plan documents or call your administrator to learn what documentation they require.
If your FSA does not have a debit card, or if a provider will not accept it, you can pay out of pocket and then request reimbursement. You submit receipts and an itemized claim form to your administrator, and they send you a check or direct deposit within 5 to 10 business days. Keep all receipts for at least three years in case of an audit.
Some employers allow you to pay providers directly from the FSA without a debit card—you authorize the provider to bill the account. This is less common but eliminates the need for receipts. Ask your benefits team whether this option is available in your plan.
The "use it or lose it" rule and grace periods
Money left in your FSA at the end of the plan year is forfeited. If your plan year ends December 31 and you have $400 remaining, that $400 goes back to your employer. You do not get a refund, and you cannot roll it over to the next year (unlike an HSA). This is why FSAs work best if you can predict your medical expenses fairly accurately.
Some employers offer a grace period—usually 2.5 months after the plan year ends—during which you can still spend money from the previous year's account. If your plan has a grace period, you might have until mid-March to use December's remaining balance. Not all employers offer this; check your plan documents.
A smaller number of employers allow a limited carryover: you can roll up to $640 (in 2024) into the next year's account. This is rare and requires your employer to elect it. If your employer offers neither a grace period nor a carryover, the only way to avoid losing money is to contribute conservatively—estimate what you will actually spend and contribute that amount, not the maximum.
What happens to your FSA if you leave your job
When you terminate employment, you lose access to your FSA immediately. Any money remaining in the account is forfeited to your employer, regardless of how much you contributed. This is a hard rule with no exceptions—the account is tied to your employment, not to you as an individual.
Some plans allow you to submit claims for expenses incurred before your termination date for a short window after you leave (usually 30 to 90 days). You must have receipts showing the date of service was before your last day of work. After that window closes, the account is closed permanently.
If you are leaving a job and have a large FSA balance, try to use it before your final day. Schedule dental work, order glasses, or stock up on may be able to access supplies if you can. If you cannot spend it all, accept the loss and plan differently at your next employer. Do not contribute the maximum to an FSA if you think you might leave mid-year.
FSA vs. HSA: key differences
An FSA and an HSA both use pre-tax dollars for medical expenses, but they work very differently. An HSA is portable—you keep it even if you change jobs—and unused money rolls over forever. An FSA is use-it-or-lose-it and tied to your employer. An HSA requires you to be enrolled in a high-deductible health plan (HDHP); an FSA works with any health plan.
HSAs allow you to invest the money and earn returns; FSAs do not. HSAs have higher contribution limits ($4,150 for individual coverage in 2024). FSAs are more common at large employers and are simpler to set up. If your employer offers both, an HSA is usually the better long-term choice because you do not lose the money. If only an FSA is available, it still saves you money on taxes—just be conservative with how much you contribute.
Frequently Asked Questions
Can I use my FSA debit card at any store?
No. The card only works at pharmacies, medical providers, and merchants that accept FSA payments. You cannot use it at grocery stores or general retailers, even to buy over-the-counter medications. If a store does not accept it, you will need to pay out of pocket and request reimbursement from your administrator.
What if I submit a claim and the administrator says it is not may be able to access?
You can appeal the decision by submitting additional documentation—a prescription, a letter from your doctor, or a copy of the IRS rules showing the expense qualifies. If the administrator still denies it, you can ask your employer's benefits team to review it. If it is truly ineligible, you may owe taxes on that amount plus penalties, so do not dispute frivolously.
Can I use FSA money for my spouse or children?
Yes. FSA money can be used for any family member you claim as a dependent on your taxes, including your spouse and children. You do not need to be on the same health plan. The money just has to be used for may be able to access medical expenses for someone in your household.
What happens if I do not spend all my FSA money by the deadline?
It is forfeited to your employer. You do not get a refund or a rollover (unless your plan offers a grace period or limited carryover). This is why it is important to estimate conservatively. If you are unsure how much you will spend, contribute less rather than more.
Can I change my FSA contribution mid-year?
Only if you have a may have access to life event like marriage, birth, adoption, or loss of other coverage. A job change, salary increase, or change of mind does not may have access to. If you want to adjust your contribution, you will have to wait until the next open enrollment period.