A flexible account holds money you set aside before taxes for specific expenses

A flexible spending account (FSA) is a workplace benefit that lets you put pre-tax money into an account to pay for medical, dental, vision, or dependent care costs. Your employer deducts the money from your paycheck before income tax is calculated, which lowers your taxable income for the year. You then use a debit card, reimbursement form, or direct payment to draw from that account when you have a covered expense.

The trade-off is strict: you must spend the money on may be able to access expenses within the plan year, or you lose it. There is no rollover to next year, and no refund if you don't use what you contributed. This is called the "use-it-or-lose-it" rule, and it is the defining feature that separates FSAs from regular savings accounts.

FSAs are offered by employers, not banks. You cannot open one on your own. If your employer offers one, you enroll during open enrollment, usually in the fall, and the account runs on the calendar year (January through December).

Key Takeaways

  • Money in a flexible spending account is deducted from your paycheck before taxes, reducing the income tax you owe that year.
  • You can only use FSA funds for specific medical, dental, vision, or dependent care expenses defined by the IRS.
  • Any money you don't spend by December 31 is forfeited—there is no rollover, no refund, and no exception for unused balances.
  • You enroll during your employer's open enrollment period, and contribution limits change each year (check your plan documents for the current cap).
  • FSAs are employer-sponsored; you cannot open one independently or move money between accounts once the plan year starts.

How money flows in and out of an FSA

When you enroll, you decide how much to contribute for the year. Your employer deducts that amount from your paychecks in equal installments throughout the year. The money sits in the FSA account, held by a third-party administrator (often the same company that manages your health insurance).

When you have a covered expense, you pay out of pocket and then request reimbursement, or you use the FSA debit card if your plan provides one. If you use the card, the transaction is deducted directly from your FSA balance. If you pay out of pocket, you submit a receipt and a reimbursement form to the FSA administrator, and they send you a check or direct deposit within a few days to a week.

Some plans allow you to submit claims before you have spent the full amount you contributed—meaning you can get reimbursed for expenses you plan to have. Others require you to have already paid before you request reimbursement. Check your plan documents or call the administrator to know which applies to you.

What expenses are covered and what are not

The IRS publishes a list of may be able to access expenses. Medical FSAs cover copays, deductibles, prescription drugs, dental work, vision care, hearing aids, and certain medical equipment. Dependent care FSAs cover daycare, after-school programs, and summer camps for children under 13, or adult day care for a dependent you claim on your taxes.

Common expenses that are not covered include over-the-counter medications (unless prescribed by a doctor), cosmetic procedures, gym memberships, vitamins, and general wellness products. Health insurance premiums themselves are not covered, though you can use an FSA to pay the out-of-pocket costs that your insurance does not cover.

If you submit a receipt for an ineligible expense, the FSA administrator will deny the reimbursement and the money stays in your account. You can then use it for another may be able to access expense, or it will be forfeited at year-end if you don't spend it.

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

Money in an FSA does not roll over. If you contribute $2,500 and spend only $2,000 by December 31, the remaining $500 is gone. You cannot carry it to next year, request a refund, or move it to another account. This rule exists because FSAs are a tax benefit—the IRS does not allow you to indefinitely defer taxes on unspent money.

To avoid forfeiting money, estimate your expenses carefully before you enroll. Look at what you spent on medical, dental, and vision care in the past year, add any planned procedures or expenses you know are coming, and contribute that amount. If you are unsure, contribute a conservative amount rather than overestimate.

Some employers offer a grace period of up to 2.5 months into the next year to spend money from the prior year's FSA. A few plans also allow a small carryover (usually $570 or less, depending on the year). Check your plan documents to see if either applies to you. If not, treat December as a deadline: schedule dental cleanings, order glasses, or stock up on may be able to access supplies before the year ends.

Tax savings and how much you actually save

The tax savings come from the fact that FSA contributions are deducted before income tax and payroll taxes (Social Security and Medicare) are calculated. If you contribute $2,500 to an FSA and your combined tax rate is 25 percent (federal income tax plus payroll taxes), you save $625 in taxes that year.

The savings are real, but they depend on your tax bracket and how much you contribute. Higher earners in higher tax brackets save more per dollar contributed. Someone in the 22 percent federal bracket plus 7.65 percent payroll tax saves about 30 cents per dollar; someone in the 12 percent bracket saves about 20 cents per dollar.

The risk is that if you overestimate and don't spend the money, you lose the entire contribution—not just the tax savings. A $2,500 overestimate costs you $2,500, not $625. This is why conservative estimates are safer than aggressive ones.

FSA vs. HSA: which account to use

If your employer offers both an FSA and a health savings account (HSA), they work differently. An HSA is only available if you are enrolled in a high-deductible health plan, but money rolls over year to year and never expires. An FSA has no plan restriction but uses the use-it-or-lose-it rule.

If you have access to both, an HSA is usually the better choice because you keep unused money. However, you can only contribute to one account per year—you cannot use both simultaneously. If your employer offers an FSA but not an HSA, the FSA is still a useful tax benefit as long as you estimate your expenses accurately.

Some employers offer an FSA for dependent care and an HSA for medical expenses, which is allowed. In that case, you can use both in the same year for their separate purposes.

What happens if you leave your job or change plans

If you leave your employer, your FSA account closes. Any unused balance is forfeited, even if you leave on December 30. You cannot transfer the money to a personal account or to an FSA at a new employer. This is another reason to spend down your FSA before you plan to resign or retire.

If you change jobs mid-year and your new employer offers an FSA, you can enroll in the new plan, but you start fresh with a new contribution amount and a new account. The old FSA is closed and any remaining balance is lost.

If you experience a may have access to life event—birth of a child, marriage, loss of coverage—you may be able to change your FSA contribution mid-year. Check with your employer's benefits department to see what events may have access to and what the deadline is to make changes.

Frequently Asked Questions

Can I use my FSA debit card for anything, or only medical expenses?

Only may be able to access expenses. The FSA debit card is restricted to purchases at pharmacies, doctors' offices, dental clinics, and other providers that process FSA transactions. If you try to use it at a grocery store or gas station, it will be declined. Some retailers that sell medical supplies (like bandages or crutches) may accept it, but the transaction is flagged for review.

What if I don't know how much to contribute?

Start low. Contribute an amount you are confident you will spend—for example, your annual copays plus one or two planned procedures. You can always contribute more next year if you undershoot. Overestimating and losing money is worse than underestimating and missing out on some tax savings.

Can I get my FSA money back if I don't use it?

No. The use-it-or-lose-it rule is final. Money not spent by December 31 is forfeited to your employer or the plan. Some plans offer a grace period to spend money into early February, but this is rare and must be stated in your plan documents.

What if I submit a receipt for an expense and it gets denied?

The FSA administrator will notify you that the expense is not may be able to access. The money stays in your account and you can use it for another may be able to access expense. If you don't spend it by year-end, it is forfeited. Keep receipts and check the IRS may be able to access expense list before you submit claims.

Can I have an FSA and an HSA at the same time?

No, not for medical expenses. You can have a medical FSA or an HSA, but not both in the same year. However, you can have a dependent care FSA and an HSA simultaneously, since they cover different things. Check your employer's plan documents to see what combinations are offered.