Flex spending accounts cover medical costs your insurance won't pay
A flexible spending account (FSA) is an employer-sponsored account where you set aside pre-tax money to pay for out-of-pocket medical expenses. The money you put in reduces your taxable income for the year. You can use it to pay for things your health insurance plan doesn't cover, or to cover the costs your plan does cover but you have to pay upfront — like deductibles, copays, and coinsurance.
The IRS maintains a specific list of what counts as a medical expense. If it's not on that list, you cannot use FSA money for it, even if it seems health-related. The rules are strict, and using FSA funds for ineligible items can trigger taxes and penalties on that money.
FSAs are different from Health Savings Accounts (HSAs). An HSA is portable — you keep it even if you change jobs — and the money rolls over indefinitely. An FSA is tied to your employer and has a "use it or lose it" rule: money you don't spend by the end of the plan year (usually December 31) is forfeited, though some employers offer a grace period or carryover of up to $610 into the next year.
Key Takeaways
- FSA money covers copays, coinsurance, deductibles, and other out-of-pocket medical costs your insurance requires you to pay.
- Prescription medications, medical equipment, and certain over-the-counter items are covered, but only if they treat a diagnosed medical condition.
- Cosmetic procedures, vitamins without a medical condition, and general wellness items are not covered, even if they benefit your health.
- Money you don't spend by the end of the plan year is typically forfeited, so estimate carefully when you enroll.
- You must have a receipt or explanation of benefits to prove the expense was medical and may be able to access before you reimburse yourself.
Medical expenses your FSA will pay for
FSA funds cover the out-of-pocket costs tied to treating a diagnosed medical condition. This includes copays when you see a doctor, coinsurance (the percentage of a bill you pay after insurance pays its share), and deductibles (the amount you pay before insurance kicks in). If your plan requires you to pay $50 to see a specialist, your FSA can cover that $50.
Prescription medications are covered. Over-the-counter medications are covered only if you have a prescription for them — a doctor's written order, not just a recommendation. Insulin, for example, is covered without a prescription because the IRS treats it as an exception, but most other OTC drugs require one.
Medical equipment and supplies are covered: blood glucose monitors and test strips, blood pressure cuffs, thermometers, crutches, wheelchairs, hearing aids, glasses, contact lenses, and dental work (fillings, crowns, root canals, orthodontia). Mental health treatment, including therapy and psychiatric medications, is covered. Physical therapy, chiropractic care, and acupuncture are covered if a doctor orders them to treat a specific condition.
Certain preventive care is covered: flu shots, cancer screenings, and annual physicals. Fertility treatments, including in vitro fertilization (IVF) and related medications, are covered. Pregnancy-related expenses, including prenatal care and delivery, are covered.
What your FSA will not pay for
Cosmetic procedures are not covered, even if they improve your appearance and confidence. Botox, teeth whitening, hair removal, and cosmetic surgery are ineligible. If a procedure is cosmetic but also medically necessary — for example, reconstructive surgery after an accident or burn — it may be covered, but you need documentation from your doctor stating the medical necessity.
Vitamins and supplements are not covered unless a doctor prescribes them to treat a specific diagnosed deficiency or condition. A multivitamin you take for general wellness is not covered. Probiotics, protein powders, and general nutritional supplements are not covered.
Gym memberships, fitness classes, and general wellness programs are not covered, even if your doctor recommends exercise. Weight loss programs are not covered unless they are medically supervised treatment for obesity or a weight-related condition, and even then, only the medical supervision portion may be covered, not the program itself.
Cosmetic dentistry (whitening, veneers) is not covered. Over-the-counter pain relievers, allergy medications, and cold medicines are not covered without a prescription. Sunscreen, skincare products, and toiletries are not covered. Maternity clothes are not covered. Childcare and dependent care are handled through a separate account type (a dependent care FSA), not a medical FSA.
How to pay for may be able to access expenses with your FSA
Most employers issue an FSA debit card that you can use at pharmacies, doctor's offices, and medical suppliers. The card is linked to your FSA balance and deducts money directly. Some providers will ask you to swipe the card and then verify the expense is may be able to access — the system may decline the transaction if it doesn't recognize it as medical.
If you don't have a debit card or the provider won't accept it, you can pay out of pocket and then request reimbursement. You submit a claim form (usually online through your employer's benefits portal) along with a receipt or explanation of benefits showing the date, amount, and nature of the expense. The FSA administrator reviews it and deposits the reimbursement into your bank account, typically within one to two weeks.
Keep all receipts and documentation. The IRS can audit FSA claims, and your employer's plan administrator may request proof that an expense was may be able to access. A receipt from a pharmacy or doctor's office is usually sufficient, but for borderline items, an explanation from your doctor stating the medical purpose strengthens your claim.
The use-it-or-lose-it rule and how to plan
Money in your FSA does not roll over to the next year. If you contribute $2,500 and spend only $2,000, the remaining $500 is forfeited — you lose it. This is why FSAs require careful estimation at enrollment time.
Some employers offer a grace period (usually two and a half months into the next plan year) to spend down the previous year's balance. Others allow you to carry over up to $610 of unused funds. Check your employer's plan documents to see which option applies to you.
To avoid forfeiture, estimate your medical expenses conservatively. Include predictable costs: copays for regular doctor visits, prescription refills, dental cleanings, and glasses or contact lens replacements. If you have a planned procedure (surgery, orthodontia, fertility treatment), add those costs. If you're unsure, contribute less rather than more — you can always adjust at the next enrollment period.
FSA debit cards and what happens at the register
When you use an FSA debit card, the merchant's system checks whether the item is may be able to access. At a pharmacy, the system usually recognizes prescription medications and may be able to access OTC items. At a grocery store, the card may decline if you're buying food or non-medical items, even if you're also buying an may be able to access item like a heating pad.
Some merchants require you to separate may be able to access and ineligible items at checkout. If you buy a prescription and groceries together, the cashier may ask you to pay for groceries with a different card. This is not a malfunction — it's the system working as designed.
If the card declines, it does not mean the item is ineligible; it may mean the merchant's system doesn't recognize it. You can pay out of pocket and request reimbursement by submitting a receipt and claim form. This is often faster than troubleshooting at the register.
Frequently Asked Questions
Can I use my FSA to buy over-the-counter pain relievers or allergy medicine?
Not without a prescription. As of 2020, the IRS requires a prescription for over-the-counter medications, including ibuprofen, acetaminophen, antihistamines, and decongestants. If your doctor writes a prescription for any of these, you can use your FSA. Without a prescription, you must pay out of pocket.
Is my FSA money taxed if I don't spend it?
The money you contribute is not taxed when you put it in. If you don't spend it by the end of the plan year, it is forfeited — you lose access to it, but you are not taxed on it. The tax benefit you received when you contributed is simply lost. Some plans allow carryover or a grace period; check your plan documents.
Can I use FSA money for my spouse's or child's medical expenses?
Yes, if they are covered under your health insurance plan or are your tax dependents. You can use FSA funds to pay for their copays, prescriptions, and medical equipment. You need documentation (receipt or explanation of benefits) showing the expense, just as you would for your own.
What if I leave my job — do I lose my FSA balance?
Yes. FSA funds are tied to your employer's plan. When you leave, you forfeit any remaining balance. You have a limited time (usually 60 days) to submit claims for expenses you incurred while employed, but any unspent money is lost. This is why FSAs are riskier than HSAs if you think you may change jobs.
Can I use my FSA for dental work or vision care?
Yes. Dental work (cleanings, fillings, crowns, root canals, braces) and vision care (eye exams, glasses, contact lenses, laser eye surgery) are covered. You can use your FSA to pay copays, coinsurance, and the full cost if your dental or vision plan has a separate deductible.