What Is an FSA? Everything You Need to Know

The Flexible Spending Account Explained

If you have ever scrolled past the FSA section during open enrollment without fully understanding it, you are not alone. Millions of workers skip this benefit every year and miss out on real savings. So, what’s an FSA? A Flexible Spending Account is an employer-sponsored benefit that lets you set aside pre-tax money from your paycheck to pay for qualified medical expenses. By reducing your taxable income, an FSA effectively gives you a discount on healthcare costs equal to your combined marginal tax rate — often 25 to 35 percent or more. If you want the plain-English one-liner, our companion explainer on what FSA means covers the basics in under a minute.

For 2026, the IRS allows employees to contribute up to $3,400 to a healthcare FSA through salary reductions (verify the current figure with your plan, as the IRS adjusts it most years for inflation). That means if you are in the 22 percent federal bracket, pay roughly 5 percent state income tax, and also avoid the 7.65 percent FICA payroll tax on contributions, electing the maximum could save you well over $1,000 in taxes while covering expenses you would have paid for anyway. The exact savings depend on your bracket and state, but the math makes a strong case for participation.

How an FSA Works

During your employer’s open enrollment period — typically in the fall — you choose how much to contribute for the upcoming plan year. Your employer deducts that amount in equal installments from each paycheck, before federal income tax, state income tax (in most states), and FICA taxes are calculated. Because the money never appears in your taxable wages, the benefit is automatic — you do not claim it separately on your tax return.

The full annual amount is available on the first day of the plan year. If you elect $3,400, you can spend all $3,400 in January even though only one paycheck has been deducted. This is called the uniform coverage rule, and it sets the FSA apart from an HSA, where you can only spend what you have deposited so far. In practice, this means a large planned expense early in the year — orthodontics, LASIK, or a dental procedure — can be paid up front and repaid through the rest of the year’s deductions.

You access your funds through an FSA debit card or by submitting receipts for reimbursement. Eligible purchases are processed tax-free, and your administrator may auto-verify expenses at the point of sale. Keep every receipt: the IRS requires that FSA reimbursements be substantiated, and your administrator can ask for documentation even on card purchases. For a step-by-step walkthrough of enrollment, deductions, and claims, see our detailed guide to how an FSA works.

What Does an FSA Cover?

FSA-eligible expenses are defined by IRS Section 213(d) and Publication 502. The CARES Act of 2020 permanently expanded eligibility to include over-the-counter medicines without a prescription and menstrual care products. Today, qualified expenses commonly include doctor visits, specialist consultations, and hospital charges; prescription medications; over-the-counter medications (pain relievers, allergy meds, cold remedies — no prescription needed); dental care (exams, fillings, orthodontics, dentures); vision care (glasses, contacts, LASIK); mental health services; physical and occupational therapy; medical equipment (blood pressure monitors, CPAP supplies, hearing aids); menstrual care products; sunscreen with SPF 15+; and first-aid supplies.

Items that are not eligible include gym memberships, cosmetic procedures, general-purpose vitamins, standard toiletries, and insurance premiums. Some “dual-use” items — such as an air purifier or a humidifier — can qualify only with a Letter of Medical Necessity from a provider. Eligibility can change year to year and vary by administrator, so treat any list as a starting point and confirm before you buy. For the complete category-by-category breakdown, see our FSA eligible items list.

The Use-It-or-Lose-It Rule

The most important limitation of an FSA is the use-it-or-lose-it provision. Unlike an HSA, FSA funds do not roll over indefinitely. At the end of the plan year, any unspent balance is generally forfeited. Employers may offer one (but not both) of two relief provisions, and neither is required:

• Grace period: Up to 2.5 additional months after the plan year ends to incur eligible expenses against the prior year’s balance.
• Carryover: Up to $680 (2026 limit, indexed for inflation) carries into the next plan year. Amounts above the carryover cap are forfeited.

Confirm which option — if either — your plan offers, and note the exact deadlines in writing, because they differ by employer. Because of this rule, the standard advice is to contribute conservatively — only the amount you are confident you will spend. Review your prior year’s medical expenses to set a realistic target, then add a modest buffer.

Types of FSAs

Not all Flexible Spending Accounts are the same. Understanding the differences helps you choose the right account for your situation.

Healthcare FSA (General Purpose)

This is the most common type. It covers the full range of IRS-qualified medical expenses — medical, dental, vision, and prescription costs. If you are enrolled in a traditional health plan (PPO or HMO), this is the FSA available to you. A general-purpose healthcare FSA makes you ineligible to contribute to an HSA, which matters if you also have a high-deductible health plan.

Limited Purpose FSA (LPFSA)

Designed for people who also have an HSA, the LPFSA covers only dental and vision expenses (and, in some plans, post-deductible medical costs). By restricting the scope, it avoids conflicts with HSA eligibility rules, letting you stack tax-advantaged accounts. Learn more in our LPFSA guide.

Dependent Care FSA (DCFSA)

This account is separate from the healthcare FSA and covers child care, preschool, day camp, and some elder care expenses that enable you to work. For years the household contribution limit was capped at $5,000 ($2,500 if married filing separately). Under the 2025 federal tax law, this cap is scheduled to increase — reported at up to $7,500 per household beginning in 2026 — but the effective figure depends on final IRS guidance and whether your employer adopts it, so verify the current limit with your plan administrator before electing. For details, see our article on dependent care FSA eligible expenses.

FSA vs. HSA: Which Is Better?

When people ask “what’s an FSA,” the follow-up question is usually how it compares to a Health Savings Account. Both offer tax-free spending on medical expenses, but they differ in key ways. (Our dedicated FSA vs HSA explainer walks through each account side by side.)

• Eligibility: An FSA is available with most employer-sponsored health plans; an HSA requires enrollment in a qualifying high-deductible health plan (HDHP).
• Rollover: FSA funds generally expire at year-end (with limited carryover or a grace period); HSA funds roll over forever and can be invested.
• 2026 limits: The health FSA salary-reduction limit is $3,400; the HSA limit is $4,400 (self-only) or $8,750 (family), plus a $1,000 catch-up at age 55 — verify current HSA figures, as they are indexed annually.
• Ownership: FSAs are tied to your employer and generally end when you leave; HSAs belong to the individual and are portable across jobs.

For employees without access to an HDHP, the FSA is the only option. For those with an HDHP, the HSA is typically the stronger long-term vehicle — but pairing it with a Limited Purpose FSA adds dental and vision coverage without affecting HSA eligibility. Our HSA and FSA comparison goes deeper into the trade-offs.

How to Maximize Your FSA

Start by estimating your predictable annual medical costs: copays, prescriptions, dental cleanings, glasses or contacts, and any planned procedures. Add a small buffer for unexpected expenses like urgent care visits or OTC medications. Compare that total to the $3,400 cap and elect accordingly. Because the money is pre-tax, even a modest election returns real savings — the trick is not over-electing beyond what you will realistically spend.

If you reach the fourth quarter with a remaining balance, spend it on qualifying items before your deadline. Schedule dental work, order new glasses, stock up on OTC medications and first-aid supplies, replace CPAP consumables, or purchase SPF 15+ sunscreen for the year ahead. The goal is to use every dollar without rushing into unnecessary purchases. Keep a running list of expenses and receipts throughout the year so December is not a scramble.

Frequently Asked Questions

Can I change my FSA election mid-year?

Generally, no. FSA elections are locked for the plan year. Exceptions include qualifying life events such as marriage, divorce, the birth or adoption of a child, or a change in employment status. Some plans also permit changes if the cost of covered insurance changes significantly. Check your plan document for the specific rules.

What happens to my FSA if I leave my job?

Your FSA typically ends on your last day of employment. You can be reimbursed for eligible expenses incurred before your termination date, but you cannot submit new claims after that. COBRA continuation for FSAs is available in some cases but is rarely cost-effective. Because of the uniform coverage rule, if you have spent more than you have contributed when you leave, you generally are not required to repay the difference.

Can I have both an FSA and an HSA?

You can have an HSA and a Limited Purpose FSA or a post-deductible FSA simultaneously. You cannot have a general-purpose healthcare FSA and an HSA at the same time — the general FSA disqualifies you from HSA contributions, and this can apply if your spouse’s general FSA covers you as well.

Is the FSA debit card accepted everywhere?

FSA debit cards work at most pharmacies, medical offices, and online retailers that sell eligible products. Some merchants require manual claim submission. If your card is declined, pay out of pocket and submit a reimbursement request with your receipt.

Do both spouses need separate FSAs?

Each spouse can have their own healthcare FSA if their employer offers one, and each can contribute up to the IRS maximum. However, the same expense cannot be reimbursed from both accounts. For a Dependent Care FSA, the household limit is shared between spouses rather than doubled.

Does an FSA cover my spouse and dependents?

Yes. A healthcare FSA can reimburse qualified medical expenses for you, your spouse, and your tax dependents, even if they are not on your health plan. Dependent Care FSA rules are different and tied to expenses that let you (and your spouse, if married) work.

Take Advantage of Your FSA This Year

Now that you know what an FSA is and how it works, the next step is putting it into action. Review your upcoming medical expenses, set a realistic contribution during open enrollment, and keep your receipts organized throughout the year. The pre-tax savings are automatic and meaningful — especially when you combine them with smart shopping for eligible products. For further guidance, explore our detailed FSA breakdown, our FSA vs HSA comparison, and our healthcare costs guide.