How FSA money works in practice

Your FSA holds pre-tax dollars that you set aside during open enrollment. To use that money, you pay for a covered medical expense out of pocket, then submit a claim to your FSA plan administrator with a receipt or explanation of benefits. The administrator reviews it, approves it if it's a covered item, and reimburses you. You don't get the money automatically — you have to request it.

The key difference from a regular savings account: your FSA money is only yours if you spend it on things the IRS allows. If you set aside $2,500 and only spend $1,800 on covered expenses by the end of the plan year, you lose the remaining $700. That's called the use-it-or-lose-it rule, and it's why planning matters.

Some plans offer a grace period (usually 2.5 months into the next year) or a carryover of up to $610 (the amount changes yearly) to soften that rule. Check your plan documents to see if yours does.

Key Takeaways

  • You pay for covered medical expenses yourself, then submit receipts to your FSA administrator to get reimbursed.
  • Covered expenses include copays, deductibles, prescriptions, dental work, vision care, and many over-the-counter items, but not insurance premiums or cosmetic procedures.
  • Keep every receipt and explanation of benefits — your FSA administrator will ask for proof before they reimburse you.
  • Money you don't spend by the end of the plan year is forfeited unless your plan offers a grace period or carryover.
  • You can request reimbursement by mail, online portal, or phone, depending on your plan administrator.

What counts as a covered expense

The IRS maintains a list of medical expenses you can pay for with FSA money. Copays and coinsurance on any doctor visit count. Deductibles count. Prescription medications count. Dental work — fillings, cleanings, root canals, orthodontia — counts. Vision care including eye exams, glasses, and contact lenses counts.

Many over-the-counter items also count: pain relievers, allergy medicine, antacids, cold medicine, bandages, and first-aid supplies. Sunscreen counts. Feminine hygiene products count. Hearing aids and batteries count. Therapy copays count. Mental health treatment copays count.

Things that do not count: health insurance premiums (medical, dental, or vision), cosmetic procedures like teeth whitening or Botox, vitamins and supplements (unless prescribed by a doctor for a specific condition), gym memberships, weight-loss programs, and over-the-counter items that are not medical in nature. Your plan administrator should provide a full list of covered and non-covered items, or you can search the IRS's Publication 502 online.

How to submit a claim and get reimbursed

The process starts with keeping your receipt or explanation of benefits. When you're ready to claim reimbursement, log into your FSA plan's online portal, call the administrator's customer service line, or mail in a claim form — the method depends on your specific plan. Your plan documents or the back of your FSA debit card should list all three options.

You'll need to provide the date of the expense, the provider's name, the amount, and what the expense was for. Attach a copy of the receipt or EOB. If you're claiming multiple expenses at once, list them all on one form or submission.

The administrator will review your claim within 5 to 10 business days. If the expense is covered and your documentation is clear, they'll approve it and send the reimbursement to your bank account or issue a check. If they need more information — for example, if the receipt doesn't clearly show what you bought — they'll contact you and ask you to clarify or provide additional proof.

Using an FSA debit card versus requesting reimbursement

Some FSA plans issue a debit card that you can swipe at pharmacies, doctor's offices, and other providers. This is faster than paying out of pocket and claiming later. However, the debit card only works at merchants that are set up to accept FSA payments, and the transaction has to be for a covered expense.

If you use the debit card, the administrator may still ask you to submit a receipt after the fact to confirm the purchase was FSA-may be able to access. This is called substantiation, and it's a compliance requirement. If you don't provide the receipt within a set time frame (usually 30 to 60 days), the administrator may reverse the charge and deduct it from your FSA balance.

Many people prefer to pay out of pocket and claim reimbursement later because it gives them full control over the documentation and timing. Others prefer the debit card for convenience. Both methods draw from the same FSA balance, so the choice is yours.

Timing: when you can claim expenses and when money runs out

You can only claim expenses that occurred during your plan year. If your plan year runs from January 1 to December 31, you can claim any expense from that calendar year, even if you submit the claim in early January of the next year. Once the plan year ends, you cannot claim expenses from the previous year.

Your FSA balance resets to zero on the first day of the new plan year. If your plan offers a grace period, you have a window (usually through mid-March) to spend remaining money from the previous year. If your plan offers a carryover, up to $610 rolls into the new year and you can spend it anytime during that year.

If you run out of FSA money before the end of the plan year, you cannot claim any more expenses until the next year. This is why estimating your annual medical expenses during open enrollment matters — you want to set aside enough to cover what you'll actually spend, but not so much that you forfeit money.

What happens if you change jobs or lose coverage

If you leave your job mid-year, your FSA coverage typically ends on your last day of employment. You can claim any expenses that occurred before that date, but you cannot claim expenses after you've left. Any remaining balance in your FSA is forfeited — you don't get to take it with you or roll it into a new plan.

This is one reason to submit claims promptly if you know you're leaving. If you have $800 left in your FSA and you're leaving at the end of the month, submit any pending claims before your coverage ends so you don't lose that money.

If you have a may have access to life event — birth of a child, marriage, loss of coverage — you may be able to enroll in an FSA outside of open enrollment. The rules vary by employer, so check with your HR department.

Common mistakes to avoid

The biggest mistake is setting aside too much money and losing it at year-end. If you're unsure how much you'll spend, start low — you can always increase your contribution next year. The second mistake is not keeping receipts. Your FSA administrator will ask for proof, and without it, they won't reimburse you.

A third mistake is claiming non-covered expenses. Cosmetic procedures, gym memberships, and over-the-counter items that aren't medical won't be reimbursed, and submitting false claims can trigger an audit of your entire account. Stick to the IRS-approved list.

Finally, don't wait until December to submit claims. If you're unsure whether an expense is covered, submit the claim early so the administrator has time to ask for clarification. If you wait until late December and they need more information, you may run out of time before the plan year ends.

Frequently Asked Questions

Can I use my FSA money for my spouse or children?

Yes. FSA money can pay for covered medical expenses for you, your spouse, and any dependent children, regardless of whether they're on your health insurance plan. You'll need receipts showing the dependent's name and the date of service, but the money comes from your FSA balance.

What if my receipt doesn't show exactly what I bought?

Contact your FSA administrator and ask what additional documentation they need. If you bought multiple items and the receipt just says "pharmacy," they may ask for an itemized receipt from the pharmacy or a note from your doctor confirming the purchase was medically necessary. Call the provider and request a detailed receipt if the original one isn't clear enough.

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

No. You can only claim expenses that occurred on or after your FSA plan start date. If you enrolled mid-year, expenses from before that date are not covered, even if you pay for them with FSA money after enrollment.

What if I submit a claim and the administrator denies it?

The administrator will send you a denial letter explaining why the expense isn't covered. If you believe the decision is wrong, you can appeal it — your plan documents should explain the appeal process. You can also contact your employer's HR department to ask whether the plan has any flexibility or whether the expense might be covered under different circumstances.

Do I have to use all my FSA money before I can claim a reimbursement?

No. You can claim reimbursement for any covered expense as soon as it occurs, regardless of how much money is left in your account. The administrator will deduct the reimbursement from your balance, and you can continue to claim other expenses throughout the plan year.