A flexible savings account holds money you set aside before taxes are taken out, so you can pay for medical or dependent care costs with pre-tax dollars

A flexible savings account (FSA) is an employer-sponsored plan where you contribute money from your paycheck before income tax and payroll taxes are applied. The money sits in an account you control, and you withdraw it to pay for may have access to medical expenses or dependent care costs — depending on which type of FSA your employer offers. Because the contributions come out before taxes, you pay less in federal income tax and Social Security tax on that money.

The catch is that FSAs operate on a "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. Some employers offer a grace period of up to 2.5 months into the next year, or let you carry over up to $610 annually, but this varies. You decide how much to contribute each year during your employer's open enrollment period, and that amount is locked in unless you have a may have access to life event like a birth, marriage, or loss of coverage.

Key Takeaways

  • FSA contributions come from your paycheck before taxes, which lowers your taxable income and the amount of federal and payroll tax you owe.
  • You can use FSA money only for may have access to medical expenses (medical FSA) or dependent care costs like daycare or after-school programs (dependent care FSA).
  • Money left unspent at the end of the plan year is forfeited unless your employer offers a grace period or carryover option.
  • You set your contribution amount once per year during open enrollment, and you cannot change it mid-year unless you have a may have access to life event.

How contributions and withdrawals work

When you enroll in an FSA, you choose a dollar amount to contribute for the year — typically between $100 and $3,200 for a medical FSA, or up to $5,000 for a dependent care FSA (these limits change annually). Your employer divides that amount by the number of pay periods and deducts it from each paycheck before calculating your income tax. The money goes into an account managed by a third-party administrator, usually a benefits company your employer contracts with.

To withdraw money, you submit a claim to the FSA administrator. Most plans give you a debit card linked to the account that you can use at pharmacies, doctors' offices, and other providers — the card automatically deducts the cost from your FSA balance. If you pay out of pocket, you keep the receipt and submit it to the administrator for reimbursement, which typically takes one to two weeks. Some employers also let you request reimbursement through an online portal or mobile app.

The administrator verifies that your expense is may have access to before releasing the money. For medical FSAs, this means the expense must be for diagnosis, treatment, or prevention of disease or injury — things like copays, deductibles, prescription medications, and dental work. For dependent care FSAs, the expense must be for care that allows you to work, such as daycare, preschool, or summer camp for children under 13.

Medical FSA versus dependent care FSA

An employer may offer one or both types of FSA. A medical FSA covers healthcare costs not paid by your insurance — copays, coinsurance, deductibles, prescription drugs, dental care, vision care, and medical equipment like crutches or hearing aids. It does not cover insurance premiums, over-the-counter medications (unless prescribed), or cosmetic procedures. You can use it for yourself, your spouse, or any dependent you claim on your taxes.

A dependent care FSA covers the cost of childcare or adult dependent care that enables you to work. This includes daycare centers, in-home babysitters, preschool, after-school programs, and adult day care for an aging parent. It does not cover education (like K–12 tuition), overnight camps, or care provided by a spouse or dependent. The annual limit is lower than a medical FSA — currently capped at $5,000 per household per year — because the tax benefit is structured differently.

Some employers offer both plans, and you can contribute to each separately. Your contribution limits are independent: you might put $2,000 into a medical FSA and $3,000 into a dependent care FSA in the same year. However, you cannot use money from one account to pay for expenses covered by the other.

The use-it-or-lose-it rule and carryover options

FSAs operate under a strict forfeiture rule: any money remaining in your account at the end of the plan year is returned to your employer and you lose access to it. This is why FSAs require careful planning — you need to estimate your expenses accurately or risk leaving money behind. The plan year typically runs from January 1 to December 31, though some employers use different fiscal years.

To soften this rule, the IRS allows employers to offer one of two options. A grace period lets you spend FSA money through March 15 of the following year on expenses incurred during that grace period. A carryover lets you carry up to $610 (adjusted annually for inflation) from one year into the next. Your employer chooses which option to offer, if any — not all employers provide either. Check your plan documents or ask your benefits administrator which option applies to you.

If you have a may have access to life event — birth of a child, marriage, divorce, loss of health coverage, or significant change in dependent care costs — you can change your FSA contribution mid-year. You have 30 to 60 days from the event to notify your employer and adjust your contribution for the remainder of the year.

Tax savings from an FSA

The main benefit of an FSA is the tax savings. Because your contribution comes out before federal income tax, Social Security tax, and Medicare tax are calculated, you reduce your taxable income. For example, if you contribute $2,000 to a medical FSA and your combined federal, state, and payroll tax rate is 25 percent, you save $500 in taxes on that $2,000. The exact savings depend on your tax bracket and state taxes.

This tax benefit is available only if you use the money for may have access to expenses. If you withdraw money for a non-may have access to expense, you owe income tax on that amount plus a 20 percent penalty. The FSA administrator is responsible for flagging non-may have access to claims, so submitting a receipt for an ineligible expense will be rejected.

How to enroll and what happens if you miss the deadline

FSA enrollment happens once per year during your employer's open enrollment period, which is usually in the fall for a plan year starting January 1. You receive information about the plan, the contribution limits, and the claims process, then submit your election through your employer's benefits portal or benefits administrator. You must enroll during this window — if you miss it, you cannot join the plan until the next open enrollment period, unless you have a may have access to life event.

If you are a new employee, you typically have 30 to 60 days from your hire date to enroll in the FSA. If you miss that window and do not have a may have access to event, you will have to wait until the next open enrollment to join. Some employers allow you to enroll in an FSA when you first become may be able to access for health insurance through the company, so timing matters.

Once you enroll, your contributions are deducted automatically from each paycheck for the remainder of the plan year. You can change your contribution amount only during the next open enrollment period or if you experience a may have access to life event. If you leave your job, your FSA coverage typically ends on your last day of employment, though you may have the option to continue claims for expenses incurred while you were enrolled (called COBRA continuation, though FSA COBRA rules differ from health insurance COBRA).

Common mistakes and how to avoid them

The most common mistake is overestimating expenses and losing money to forfeiture. To avoid this, track your actual medical or dependent care spending from the previous year and use that as a baseline. If your expenses vary, choose a conservative amount — it is better to contribute less and not use all of it than to contribute too much and forfeit the difference.

Another mistake is submitting claims for non-may have access to expenses. Before you submit a receipt, check your plan's list of may have access to expenses or ask the administrator. Over-the-counter medications, for example, are not covered unless prescribed by a doctor. Cosmetic procedures, gym memberships, and vitamins are also commonly rejected.

A third mistake is forgetting to submit claims before the deadline. If your plan has a grace period, you have until March 15 of the following year to submit claims for expenses incurred during that period. After the deadline passes, you cannot file a claim for that money. Keep receipts organized and submit them promptly to avoid missing the window.

Frequently Asked Questions

Can I use my FSA debit card at any store?

No. The FSA debit card works only at merchants that accept FSA payments — pharmacies, doctors' offices, hospitals, and medical supply stores. It will be declined at grocery stores or gas stations, even if you are buying FSA-may have access to items like over-the-counter pain relievers. Some online retailers that sell medical supplies accept FSA cards, but you need to check before purchasing.

What happens to my FSA if I leave my job?

Your FSA coverage ends on your last day of employment. You can submit claims for expenses you incurred while enrolled, but you cannot make new withdrawals after you leave. Some employers allow you to continue the plan under COBRA rules, which means you pay the full premium yourself, but FSA COBRA is less common than health insurance COBRA. Check with your benefits administrator about your options.

Can I use my FSA to pay for my spouse's medical expenses?

Yes, if your spouse is your dependent for tax purposes. You can use your medical FSA to pay for your spouse's copays, deductibles, prescriptions, and other may have access to medical expenses. However, your spouse cannot have their own separate FSA through their employer — only one FSA per person per household per year.

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

The administrator will send you a notice explaining why the expense is not may have access to. You can appeal the decision by providing additional documentation — for example, a prescription from your doctor for an over-the-counter medication. If the appeal is denied, you can request reimbursement from your own funds, but you will not receive the FSA tax benefit for that expense.

Can I change my FSA contribution if my expenses change mid-year?

Only if you have a may have access to life event, such as a birth, marriage, divorce, or significant change in dependent care costs. A change in your health or medical expenses alone does not may have access to. If you do not have a may have access to event, you are locked into your contribution amount for the rest of the plan year.