What a Flexible Spending Account actually does

A Flexible Spending Account (FSA) lets you set aside money from your paycheck before taxes are taken out, then use that money to pay for medical costs your insurance doesn't cover. The money comes out of your pay automatically throughout the year, and you withdraw it as you need it.

The main advantage is the tax savings. Because the money goes in before federal income tax, Social Security tax, and Medicare tax are calculated, you pay less in taxes overall. If you set aside $2,500 for the year and your tax rate is roughly 25 percent, you save about $625 in taxes on that money.

The catch 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. You cannot carry it forward to next year, and you cannot get it back as a refund. This is why you need to estimate carefully how much you will actually spend.

Key Takeaways

  • You choose how much to set aside each year during open enrollment, and that money comes out of your paycheck automatically before taxes.
  • You can use FSA money for copays, deductibles, prescriptions, dental work, vision care, and other medical costs your insurance does not cover.
  • Money left unspent at the end of the year is forfeited, so you should only set aside what you realistically expect to use.
  • You request reimbursement by submitting receipts and a claim form to your FSA administrator, or by using a debit card if your plan offers one.
  • You can only change your FSA election during open enrollment or if you have a may have access to life event like a birth, marriage, or loss of other coverage.

What medical costs you can pay with FSA money

The IRS maintains a list of may have access to medical expenses that FSA money can cover. These include copays and coinsurance (the percentage of a bill you pay after insurance), deductibles, prescription medications, and dental and vision care that your regular insurance does not pay for.

You can also use FSA funds for items like over-the-counter pain relievers, allergy medications, and first aid supplies — but only if you have a prescription or a doctor's written order. Vitamins and supplements do not count unless prescribed by a doctor for a specific medical condition. Cosmetic procedures, gym memberships, and general wellness products are not covered.

Mental health care, physical therapy, hearing aids, and medical equipment like crutches or blood pressure monitors all may have access to. If you are unsure whether a specific cost is covered, ask your FSA administrator before you spend the money — they can give you a written answer.

How to set up your FSA and choose an amount

You enroll in an FSA during your employer's open enrollment period, which usually happens once a year in the fall for coverage starting January 1. You will receive materials from your employer or benefits administrator explaining the plan and asking you to choose how much to set aside.

The key step is estimating your medical spending for the next year. Look back at what you actually spent on copays, prescriptions, dental work, and other out-of-pocket costs. If you wear glasses or contacts, need regular dental cleanings, take daily medications, or have a planned procedure, add those costs. Be realistic — it is better to set aside less and not lose money than to overestimate and forfeit the difference.

For 2024, the IRS allows you to set aside up to $3,200 per year in an FSA (this limit changes annually). Once you submit your election, that amount is locked in for the entire plan year unless you have a may have access to life event like a birth, marriage, divorce, loss of health coverage, or significant change in your medical needs.

How to request money from your FSA

There are two main ways to access your FSA funds, depending on what your employer's plan offers.

If your plan provides a debit card, you can swipe it at pharmacies, doctor's offices, and other providers that accept it. The card is linked to your FSA account and automatically deducts from your balance. This is the fastest method because you do not have to file paperwork.

If your plan does not offer a debit card, you pay out of pocket and then request reimbursement. You submit a claim form (usually available online through your FSA administrator's website) along with receipts or an explanation of benefits from your insurance company. The administrator reviews your claim and deposits the reimbursement into your bank account, usually within one to two weeks.

Keep all receipts and medical bills for at least three years. Your FSA administrator may ask you to prove that an expense was actually incurred and was a may have access to medical cost. If you cannot provide documentation, the reimbursement may be denied.

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

Any money left in your FSA at the end of the plan year is forfeited — your employer keeps it. This is a federal rule, not something your employer chooses. There is no exception for unused balances, and you cannot roll the money into next year or take it as a refund.

To avoid losing money, be conservative when you choose your amount. If you are unsure whether you will spend $2,000 or $2,500, choose $2,000. It is better to set aside less and not lose anything than to overestimate and forfeit the difference.

Some employers offer a grace period of up to 2.5 months after the plan year ends (so through mid-March if your plan year ends December 31). During this grace period, you can still submit claims for expenses you incurred in the previous year. Check with your benefits administrator to see if your plan offers this — it gives you extra time to spend down your balance.

When you can change your FSA election

You can only change how much you set aside during your employer's open enrollment period. You cannot increase or decrease your election mid-year just because you changed your mind about how much you would spend.

The exception is a may have access to life event. If you experience a birth, adoption, marriage, divorce, death of a spouse or dependent, significant change in health status, loss of health coverage, or change in your spouse's employment or benefits, you may be able to change your FSA election within 30 to 60 days of the event. You will need to provide documentation (a birth certificate, marriage license, divorce decree, or letter from your previous employer, for example).

If you leave your job, your FSA coverage usually ends on your last day of employment. You may be able to continue using your FSA through COBRA (a federal law that lets you keep employer health coverage after you leave), but you would have to pay the full premium yourself, which is expensive. Ask your benefits administrator what happens to your FSA balance when you leave.

FSA versus HSA: which one is right for you

If you have access to both an FSA and a Health Savings Account (HSA), you need to choose one — you cannot have both in the same year. The main difference is what happens to unused money.

An FSA is "use it or lose it" — unused money disappears at the end of the year. An HSA lets you carry unused money forward indefinitely and even invest it for growth. However, you can only open an HSA if you are enrolled in a high-deductible health plan, and not all employers offer HSAs.

If your employer offers both and you have a high-deductible plan, an HSA is usually the better choice because you keep the money. If you only have access to an FSA, or if you have a traditional health plan that does not may have access to for an HSA, an FSA is still valuable for the tax savings — just be careful to estimate conservatively so you do not lose money.

Frequently Asked Questions

Can I use my FSA debit card at any store?

No. FSA debit cards only work at pharmacies, doctor's offices, hospitals, and other medical providers. You cannot use it at grocery stores or general retailers, even if you are buying over-the-counter medications. Some pharmacies may require you to specify that you are buying a may have access to medical item.

What happens to my FSA if I get fired or quit my job?

Your FSA coverage ends when your employment ends, usually on your last day. You lose access to any remaining balance in your account. You may be able to continue coverage through COBRA, but you would pay the full premium yourself. Check with your benefits administrator about your specific situation.

Can I use FSA money for my spouse or children?

Yes, if they are covered under your health insurance plan. You can use your FSA to pay for their copays, prescriptions, dental work, and other may have access to medical expenses. You cannot use it for a spouse or child who is not on your plan.

Do I have to submit receipts every time I use my FSA debit card?

Not every time, but your FSA administrator may ask for receipts randomly or if a transaction looks unusual. Keep all receipts for at least three years in case you need to provide proof that an expense was may have access to.

What if I estimate wrong and set aside too much money?

You will lose the unused balance at the end of the year. This is why it is important to estimate conservatively. If your plan offers a grace period, you have extra time to spend the money on may have access to expenses. Otherwise, the best strategy is to set aside only what you are confident you will spend.