FSA (Flexible Spending Account): What It Is, How It Works, and What’s Eligible
Last updated 05/06/2026 by
Ante Mazalin
Edited by
Andrew Latham
Summary:
A Flexible Spending Account (FSA) is an employer-sponsored benefit that lets you set aside pre-tax dollars to pay for eligible healthcare or dependent care expenses.
Contributions reduce your taxable income, making FSAs one of the most straightforward tax advantages available to employees.
- Healthcare FSA: Covers out-of-pocket medical, dental, and vision expenses including copays, prescriptions, and eyeglasses.
- Dependent care FSA: Covers childcare, after-school programs, and elder care for dependents while you work.
- Use-it-or-lose-it: Unused FSA funds typically expire at the end of the plan year, making accurate contribution planning essential.
An FSA can save the average employee several hundred dollars a year in taxes without requiring any investment decisions or financial expertise. The catch is that planning matters: contribute too much and you may forfeit the difference at year end.
What Is an FSA?
A Flexible Spending Account is a tax-advantaged account offered through an employer as part of a benefits package. You elect a contribution amount during open enrollment, and that amount is deducted from your paycheck in equal installments throughout the year, before federal, state, and Social Security taxes are applied.
According to the Internal Revenue Service, FSA contributions reduce your taxable income dollar for dollar, which effectively gives you a discount on every eligible expense equal to your marginal tax rate.
Types of FSAs
Two distinct types of FSAs exist, each covering a different category of expenses. They cannot be combined into a single account.
| FSA Type | 2025 Contribution Limit | What It Covers |
|---|---|---|
| Healthcare FSA | $3,300 per year | Copays, deductibles, prescriptions, dental, vision, and eligible OTC items |
| Dependent Care FSA | $5,000 per household ($2,500 if married filing separately) | Daycare, after-school programs, summer day camps, and elder care for qualifying dependents |
| Limited Purpose FSA | $3,300 per year | Dental and vision only; available to HSA holders who cannot use a standard healthcare FSA |
FSA-Eligible Expenses
Healthcare FSA funds can be applied to a wide range of out-of-pocket costs. Common eligible expenses include your health insurance deductible, copays for doctor visits, prescription medications, glasses and contact lenses, dental cleanings and fillings, and over-the-counter medications including pain relievers and allergy medicine.
Expenses that are not eligible include insurance premiums, cosmetic procedures, gym memberships, and most nutritional supplements. The IRS publishes a complete list of eligible expenses in Publication 502.
Pro Tip
With a healthcare FSA, the full annual election amount is available to use on January 1, even before your contributions have been fully withheld. If you have a large expected expense early in the year, like braces or a planned surgery, you can use the full balance immediately and repay it through payroll deductions over the rest of the year.
The Use-It-or-Lose-It Rule
FSA funds that remain unused at the end of the plan year are forfeited. This is the most important planning consideration for FSA holders, and the reason accurate contribution estimates matter.
Employers may offer one of two relief provisions, but are not required to. A grace period extends the spending deadline up to 2.5 months into the new year. A rollover option allows carrying over up to $660 (2025 limit) into the following year. Check your plan documents to see which, if either, your employer offers.
Good to know: You can use an FSA to stock up on eligible over-the-counter items near the end of the plan year if you have an unspent balance. Eligible OTC purchases including bandages, pain relievers, and cold medicine count as qualified expenses and do not require a prescription.
FSA vs. HSA: Key Differences
FSAs and Health Savings Accounts (HSAs) both reduce your tax burden on healthcare spending, but they work differently and are not always interchangeable.
- Eligibility: An FSA is available with any employer health plan. An HSA requires enrollment in a high-deductible health plan (HDHP).
- Rollover: HSA funds roll over indefinitely with no annual forfeiture risk. FSA funds expire each year (subject to any grace period or rollover your employer offers).
- Portability: An HSA belongs to you and moves with you when you change jobs. An FSA is tied to your employer.
- Investment: HSA balances above a threshold can be invested. FSA balances cannot.
- Combined use: You generally cannot hold both a healthcare FSA and an HSA simultaneously. A limited purpose FSA (dental and vision only) is allowed alongside an HSA.
How to Enroll in an FSA
FSA enrollment happens during your employer’s open enrollment period, typically in the fall for plans that begin January 1. You elect your contribution amount for the full year, and that election is generally locked in until the next open enrollment unless you have a qualifying life event (marriage, birth of a child, change in employment).
To estimate how much to contribute, review your prior year’s out-of-pocket healthcare spending and any anticipated expenses for the coming year. Dental work, prescription refills, and vision expenses are often predictable enough to plan around.
Reviewing your health insurance plan options at the same time helps you coordinate your FSA election with your expected deductible and copay obligations for the year.
Related reading on healthcare benefits
- Deductible — how health insurance deductibles work and why FSA funds are a tax-efficient way to cover them before your plan kicks in.
- Copay — the fixed out-of-pocket cost at each medical visit, one of the most common eligible expenses for a healthcare FSA.
- Health insurance — how health plans are structured and how your plan type determines whether you qualify for an FSA or an HSA.
- Federal income tax — how FSA contributions reduce your taxable wages and lower your overall federal income tax bill.
Frequently Asked Questions
What does FSA stand for?
FSA stands for Flexible Spending Account. It is an employer-sponsored, tax-advantaged account used to pay for eligible healthcare or dependent care expenses with pre-tax dollars.
What happens to my FSA if I leave my job?
Healthcare FSA funds are generally forfeited when you leave your employer, unless you elect COBRA continuation coverage. Under COBRA, you can continue accessing your FSA through the end of the plan year, but you must continue making contributions. Dependent care FSA funds already contributed may still be used for eligible expenses through the plan year end.
Can I use my FSA for dental and vision expenses?
Yes. A standard healthcare FSA covers eligible dental expenses (cleanings, fillings, orthodontia) and vision expenses (exams, glasses, contact lenses, and contact lens solution). These costs are among the most common and predictable uses for FSA funds.
Is an FSA worth it?
For most employees with predictable healthcare expenses, an FSA provides a guaranteed tax savings on dollars you would have spent anyway. The main risk is overestimating your expenses and forfeiting the excess. Start conservatively if you are unsure, and increase your election once you have a clear picture of your annual spending.
Can I change my FSA contribution mid-year?
FSA elections are locked at the start of the plan year and generally cannot be changed mid-year unless you experience a qualifying life event. Qualifying events include marriage, divorce, the birth or adoption of a child, or a change in your own or your spouse’s employment status.
Key takeaways
- An FSA lets you set aside pre-tax dollars through your employer to pay for eligible healthcare or dependent care expenses.
- The 2025 healthcare FSA limit is $3,300; the dependent care FSA limit is $5,000 per household.
- Unused FSA funds are forfeited at year end unless your employer offers a grace period or a rollover option of up to $660.
- The full healthcare FSA election is available to spend on January 1, even before payroll contributions have been fully deducted.
- FSAs differ from HSAs in portability, rollover rules, and eligibility requirements; the two generally cannot be held simultaneously.
Your health plan choice determines whether an FSA or an HSA is the better fit for your situation. Compare health insurance plans on SuperMoney to find coverage that aligns with your expected out-of-pocket costs and tax-saving goals.
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