A Health FSA is a tax-advantaged account your employer sets up so you can set aside pre-tax money for medical expenses

A Flexible Spending Account (FSA) for health is an account where you contribute money from your paycheck before taxes are taken out. Your employer holds the account and deducts your contributions across your pay periods. You then use that money to pay for may be able to access medical, dental, and vision expenses out of pocket. The tax savings come because the money you contribute is not subject to federal income tax or payroll taxes — you only pay taxes on what you actually spend on healthcare.

The account is not an insurance plan. It works alongside whatever health insurance your employer offers. If you have a high-deductible health plan, you might use an HSA instead (or in addition, depending on your plan). If you have a standard health plan, an FSA is often the option available to you.

The money sits in an account managed by a third-party administrator your employer contracts with — companies like WageWorks, Conduent, or HealthEquity handle these accounts. You request reimbursement when you have an may be able to access expense, usually by submitting a receipt and a claim form, though many administrators now offer debit cards tied directly to the account.

Key Takeaways

  • You contribute pre-tax money through payroll deductions, which reduces your taxable income and the taxes you owe that year.
  • You can use FSA funds for copays, deductibles, prescriptions, dental work, vision care, and other IRS-approved medical expenses, but not for insurance premiums or over-the-counter medications without a prescription.
  • Most FSAs operate on a "use it or lose it" basis — money you do not spend by the end of the plan year is forfeited, though some employers offer a grace period or carryover option.
  • You can only enroll in an FSA during your employer's open enrollment period or within 30 to 60 days of a may have access to life event like marriage, birth, or loss of coverage.
  • FSA contributions have an annual limit set by the IRS, which changes each year and is lower than HSA limits.

How much you can contribute and the annual limit

The IRS sets a maximum amount you can contribute to a health FSA each year. For 2024, that limit is $3,200. For 2025, it is $3,300. The limit changes annually and is announced by the IRS in the fall for the following year. Your employer will tell you the current limit during open enrollment.

You choose your contribution amount when you enroll, and that money is deducted from your paycheck in equal installments across the year. If you are paid biweekly, your employer divides your annual contribution by 26 and deducts that amount from each check. You cannot change your contribution mid-year unless you have a may have access to event — marriage, birth of a child, loss of other coverage, or a significant change in expenses.

The contribution limit for an FSA is lower than for an HSA. If you are comparing the two, this is one key difference: HSAs allow higher annual contributions but require enrollment in a high-deductible health plan, while FSAs work with any health plan but cap contributions lower.

What expenses you can pay for with FSA funds

The IRS maintains a list of may have access to medical expenses you can pay for with FSA money. These include copays and coinsurance, deductibles, prescription medications, dental work (fillings, cleanings, root canals, orthodontia), vision care (eye exams, glasses, contact lenses), hearing aids, and certain medical equipment like crutches or blood pressure monitors.

Over-the-counter medications are may be able to access only if you have a prescription from a doctor — you cannot buy ibuprofen or cold medicine off the shelf and use FSA funds without a prescription. Insulin is an exception and does not require a prescription. Health insurance premiums themselves are not may be able to access, nor are cosmetic procedures, gym memberships, or general wellness products.

The rules are strict because the IRS wants to may support the tax benefit is used only for genuine medical care. If you submit a receipt for an ineligible expense, the administrator will deny the claim and you will have to pay out of pocket. Keep receipts for everything — administrators often request documentation months later to verify that expenses were legitimate.

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

Most FSAs operate under a use-it-or-lose-it rule: any money you do not spend by the end of the plan year is forfeited and goes back to your employer. This is the biggest drawback of an FSA compared to an HSA, where unused money rolls over indefinitely. If you contribute $2,500 and spend only $1,800, you lose the remaining $700.

Some employers offer a grace period — typically 2.5 months into the next calendar year — during which you can still submit claims for expenses incurred in the previous year. Others offer a carryover of up to $640 (for 2024) into the next year, though your employer must elect this option. Not all employers offer either, so check your plan documents or ask your benefits administrator what applies to you.

Because of this rule, you need to estimate your medical expenses carefully when you choose your contribution amount. If you have predictable costs — regular prescriptions, dental work scheduled, or vision care — you can calculate roughly what you will spend. If your expenses are unpredictable, contributing a smaller amount or choosing an HSA (if you are may be able to access) may be safer.

How to request reimbursement and submit claims

The process for getting your money depends on how your employer's plan is set up. Some FSA accounts come with a debit card that you can swipe at the pharmacy, doctor's office, or vision center just like a regular card. The charge is deducted directly from your FSA balance. This is the simplest method and requires no paperwork at the point of purchase.

If your plan does not include a debit card, you pay out of pocket and then submit a claim for reimbursement. You gather your receipt (showing the date, amount, and what was purchased) and the provider's name, fill out a claim form through your administrator's website or app, and submit it. The administrator reviews the claim, verifies it is for an may be able to access expense, and deposits the reimbursement into your bank account — usually within 5 to 10 business days.

Some administrators require a prescription or explanation of benefits from your insurance to verify the expense. Keep all receipts for at least three to five years in case you are audited. The IRS can request documentation to prove that expenses were legitimate and that you did not claim the same expense twice (once through insurance and once through your FSA).

Enrollment, timing, and life events that let you change your election

You can only enroll in an FSA during your employer's open enrollment period, which is usually once a year in the fall for coverage starting January 1. If you miss open enrollment, you cannot enroll until the next year — there is no way to retroactively join mid-year.

You can change your FSA election outside of open enrollment if you have a may have access to life event. These include marriage, divorce, birth or adoption of a child, death of a spouse or dependent, loss of health coverage, a significant change in your spouse's benefits, or a change in your childcare costs. You typically have 30 to 60 days from the event to notify your employer and make changes. Your employer's benefits team can tell you the exact window and what documentation they need.

Once you enroll, your election is locked in for the plan year. You cannot reduce your contribution just because you spent less than expected, and you cannot increase it just because you have a large medical bill coming. This is another reason to estimate carefully at enrollment time.

FSA vs. HSA: when to choose each one

If your employer offers both an FSA and an HSA, the choice depends on your health plan and how predictable your medical expenses are. An HSA requires enrollment in a high-deductible health plan (HDHP) and allows higher annual contributions ($4,150 for individuals in 2024). Unused money rolls over year after year, making it a long-term savings tool. An FSA works with any health plan, has lower contribution limits, and forfeits unused money at year-end.

If you have a high-deductible plan and can afford to contribute to an HSA, that is usually the better choice because of the rollover feature and higher limit. If you have a standard health plan with a lower deductible, an FSA is your option. If you have predictable annual medical expenses and want to use up the full contribution, an FSA works well. If your expenses vary widely year to year, an HSA is safer because you do not lose unused money.

Frequently Asked Questions

What happens to my FSA money if I leave my job?

You lose access to the account. Your employer owns the FSA, and when you leave, your coverage ends. You cannot transfer the balance to a personal account or to an FSA at a new job. Any unused money is forfeited. If you have submitted claims before your last day, those may still be processed, but you cannot make new claims after you leave.

Can I use my FSA debit card at any pharmacy or doctor's office?

Not always. Some FSA debit cards are restricted to in-network providers or specific pharmacies. Others work more broadly. Check with your administrator about which merchants accept your card. If a merchant declines it, you can pay out of pocket and submit a claim for reimbursement instead.

Can I contribute to both an FSA and an HSA at the same time?

No. If you are enrolled in a high-deductible health plan and open an HSA, you cannot also contribute to an FSA in the same year. You must choose one. Some employers offer a limited FSA for dental and vision only, which you can use alongside an HSA — ask your benefits team if that option exists in your plan.

What if I submit a claim and the administrator says the expense is not may be able to access?

You can appeal the decision by providing additional documentation — a prescription, a letter from your doctor explaining medical necessity, or a copy of your insurance explanation of benefits. If the appeal is denied, you will have to pay the amount out of pocket. Keep records of the appeal in case the IRS questions your deductions later.

Do I have to use my entire FSA contribution, or can I contribute less than the maximum?

You can contribute any amount up to the annual limit. You do not have to max it out. Many people contribute $1,000 to $2,000 based on their expected expenses rather than the full $3,200 or $3,300. The lower you contribute, the less you risk losing at year-end.