An FSA is a savings account your employer sets up so you can pay medical bills with pre-tax money

A Flexible Spending Account (FSA) is a special savings account that lets you set aside money from your paycheck before taxes are taken out, then use that money to pay for certain medical and dependent care costs. Your employer sets it up through payroll — you do not open it yourself at a bank. The money you put in reduces your taxable income for the year, which means you pay less in federal income tax and Social Security tax.

The main reason people use an FSA is the tax savings. If you set aside $2,500 in an FSA and you are in the 22% federal tax bracket, you save roughly $550 in taxes that year. That is money back in your pocket just for using an account your employer already offers.

FSAs come in two types: a medical FSA (sometimes called a healthcare FSA) covers doctor visits, prescriptions, dental work, and vision care, and a dependent care FSA covers childcare or adult daycare costs. Most people use the medical version. You choose which type when you enroll, usually once a year during your employer's open enrollment period.

Key Takeaways

  • An FSA lets you set aside pre-tax money from your paycheck to pay for medical or dependent care costs, lowering your annual tax bill.
  • You must enroll during your employer's open enrollment window, usually in the fall, and the money you commit stays in the account for that calendar year only.
  • You can use FSA money for a wide range of costs: doctor visits, prescriptions, dental work, glasses, hearing aids, and some over-the-counter items with a prescription.
  • Any money left unspent at the end of the year is forfeited — you cannot roll it over to the next year, so you should estimate carefully what you will actually use.
  • You access the money through a debit card, reimbursement form, or direct payment to your provider, depending on how your employer's plan works.

How much you can contribute and when you choose

The IRS sets a limit on how much you can put into a medical FSA each year. That limit changes annually — check your employer's enrollment materials or your plan documents for the current year's cap. For a dependent care FSA, the limit is lower and is also set by the IRS each year.

You choose your contribution amount once a year during open enrollment, which is usually in October or November for coverage starting January 1st. You tell your employer how much to deduct from each paycheck, and that money goes into your FSA account. Once you make that choice, you are locked in for the entire calendar year — you cannot change the amount unless you have a may have access to life event, like a birth, marriage, divorce, or loss of other health coverage.

This is why estimating carefully matters. If you commit $2,500 but only spend $1,800, you lose the remaining $700. There is no way to get it back or roll it forward. Some employers offer a short grace period (usually two and a half months into the next year) to spend leftover money, but not all do, so check your plan documents.

What you can actually buy with FSA money

A medical FSA covers a long list of costs. The basics are doctor visit copays, deductibles, coinsurance (the percentage you pay after insurance), prescription medications, dental work, and vision care including glasses and contact lenses. You can also use it for hearing aids, crutches, wheelchairs, and other durable medical equipment.

Some over-the-counter items count too, but only if you have a prescription from your doctor. For example, you can buy over-the-counter pain relievers, allergy medicine, or antacids with FSA money if your doctor writes a prescription for them. Without a prescription, they do not count. Vitamins and supplements generally do not count unless your doctor prescribes them for a specific medical condition.

Items that do not count include cosmetic procedures, gym memberships, general wellness products, and most toiletries. If you are unsure whether something qualifies, ask your FSA plan administrator before you buy it — they can tell you whether a specific item or service is covered under your plan.

How you access and spend the money

Most employers give you a debit card linked to your FSA account. You swipe it at the pharmacy, doctor's office, or dental clinic just like a regular debit card, and the money comes straight from your FSA. Some employers instead require you to pay out of pocket and then submit a reimbursement form with receipts to get your money back. A few plans let you do both.

If you use the debit card, keep your receipts anyway. Your plan administrator may ask you to prove that a charge was for a covered expense, especially if the merchant's name is unclear. For example, if you buy groceries at a supermarket, the receipt shows what you bought so you can prove it was a covered medical item and not groceries.

When you submit a reimbursement form, include the receipt and a description of what the expense was for. The plan administrator reviews it and sends you a check or direct deposit. This usually takes one to two weeks. Some plans let you submit forms and receipts online through a website or app, which speeds up the process.

The "use it or lose it" rule and how to plan around it

The biggest catch with an FSA is that any money you do not spend by December 31st is gone. This is called the "use it or lose it" rule, and it exists because of IRS regulations. You cannot roll the money over to next year, transfer it to another account, or get it back as a refund. That is why choosing the right contribution amount is so important.

To avoid losing money, think about what medical costs you actually expect in the coming year. If you wear glasses and need a new pair, if you have regular dental cleanings and expect a filling, if you take prescription medications, or if you have a high insurance deductible, add those up. Be realistic — do not guess high just because the account exists.

If your employer offers a grace period, you have a little more flexibility. A grace period typically gives you until mid-March of the following year to spend money from the previous year's account. Check your plan documents to see if yours has one. If it does, you can be slightly more generous with your estimate.

FSA versus HSA: when to choose each one

If your employer offers both an FSA and an HSA (Health Savings Account), you need to understand the difference to choose correctly. An FSA is simpler but has the use-it-or-lose-it rule. An HSA is more flexible — money rolls over year to year and you can invest it — but you can only open one if you are enrolled in a high-deductible health plan, and not all employers offer HSAs.

If you have a high-deductible plan and your employer offers an HSA, the HSA is usually the better choice because you keep the money forever and can invest it for retirement. If your employer only offers an FSA, or if you have a regular (not high-deductible) health plan, then an FSA is your option for pre-tax medical savings.

Some people with high-deductible plans use both: they contribute to an HSA first (up to the annual limit), and then open a dependent care FSA if they have childcare costs. You cannot have both a medical FSA and an HSA in the same year, but you can have an HSA and a dependent care FSA together.

What happens if you change jobs or leave your employer

If you leave your job mid-year, you lose access to your FSA account when ready. Any money you contributed but did not spend is forfeited — your new employer cannot transfer it, and you cannot take it with you. This is another reason to be conservative with your contribution amount if you think you might change jobs.

If you are laid off or your hours are cut, you may be able to continue your FSA under COBRA (Consolidated Omnibus Budget Reconciliation Act), which lets you keep certain employer benefits for a limited time. You pay the full premium yourself, which is expensive, but it preserves access to the money you already set aside. Ask your employer's benefits department whether COBRA is available for FSAs at your company.

If you retire or turn 65, your FSA ends and you cannot use the remaining balance. Medicare does not work with FSAs the way employer health plans do. Plan your contribution carefully in the year you expect to retire so you do not leave money on the table.

Frequently Asked Questions

Can I use my FSA debit card at any store?

No. The debit card only works at pharmacies, doctor's offices, dental clinics, vision centers, and other medical providers. It will be declined at grocery stores or general retailers, even if you are buying a covered item like pain reliever, because the merchant is not classified as a medical provider. You can buy over-the-counter medical items with FSA money, but you usually have to pay out of pocket and request reimbursement.

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

You lose it. The IRS does not allow FSA money to roll over to the next year. If your employer offers a grace period, you have until mid-March of the following year to spend the previous year's balance. Otherwise, any unspent money is forfeited. This is why estimating your annual medical costs carefully is important.

Can I change my FSA contribution amount during the year?

Only if you have a may have access to life event: birth or adoption of a child, marriage, divorce, loss of other health coverage, or a significant change in your dependent care costs. A change in your medical expenses alone does not may have access to. You must request the change within 30 to 60 days of the event, depending on your employer's rules.

Do I need to file anything special on my taxes if I have an FSA?

No. Your employer handles the tax deduction automatically when they deduct FSA contributions from your paycheck before calculating taxes. You do not need to report it on your tax return. The money you set aside straightforward reduces your taxable income for the year.

Can I use FSA money for my spouse or children?

Yes. FSA money can be used for medical expenses of you, your spouse, and your dependents, as long as they are claimed on your tax return. You do not need to be the person receiving the care — you can use your FSA to pay for your child's dental work or your spouse's prescription, for example.