What a Medical FSA Does

A Medical Flexible Spending Account (FSA) is a workplace benefit that lets you set aside pre-tax money to pay for medical costs that your health insurance doesn't cover. You decide how much to contribute each year, the money comes out of your paycheck before taxes are taken, and you use a debit card or submit receipts to get reimbursed for may be able to access expenses.

The key difference from a regular savings account is the tax advantage: money you put into a Medical FSA reduces your taxable income for the year. If you contribute $2,500, you pay no federal income tax, Social Security tax, or Medicare tax on that $2,500. That's the main reason employers offer these accounts and why they're worth understanding.

You can only open a Medical FSA through your employer's benefits plan. You cannot open one on your own, and you can only contribute during your employer's open enrollment period each year, or when you have a may have access to life event like getting married, having a child, or losing other health coverage.

Key Takeaways

  • A Medical FSA holds pre-tax money you set aside to pay for medical expenses your insurance doesn't cover, reducing what you owe in federal and payroll taxes.
  • You choose how much to contribute each year during your employer's open enrollment, and the money comes out of your paycheck automatically.
  • You can use the money to pay for copays, deductibles, prescriptions, dental work, vision care, and many other medical costs, but not health insurance premiums or over-the-counter items without a prescription.
  • Any money you don't spend by the end of the plan year is forfeited—you cannot roll it over or get it back—so you need to estimate carefully what you'll actually use.
  • You must be enrolled in your employer's health plan to open a Medical FSA, and you can only change your contribution amount during open enrollment or after a may have access to life event.

What Medical Expenses You Can Pay For

Medical FSA money covers a wide range of healthcare costs. The main categories are copays and coinsurance (the amounts you pay when you see a doctor), deductibles (the amount you pay before insurance kicks in), prescription medications, dental work including cleanings and fillings, vision care including eye exams and glasses, and hearing aids and related services.

The account also covers less obvious expenses: over-the-counter medications if you have a prescription from your doctor, medical equipment like crutches or blood pressure monitors, mental health counseling, physical therapy, and certain medical supplies. You can even use it for some fertility treatments and certain cosmetic procedures if they're medically necessary.

What you cannot pay for with a Medical FSA includes health insurance premiums (with a few exceptions for COBRA or retiree coverage), over-the-counter items without a prescription, gym memberships or general wellness programs, and cosmetic procedures that aren't medically necessary. The IRS publishes a full list of may be able to access expenses, and your employer's plan documents will specify what their particular FSA covers.

How Much You Can Contribute and Tax Savings

The IRS sets a maximum contribution limit each year. For 2024, the limit is $3,300 per person. Your employer may set a lower limit, so check your plan documents. You decide your contribution amount during open enrollment, and that amount is divided by the number of pay periods and deducted from each paycheck.

The tax savings depend on your income and tax bracket, but here's a concrete example: if you contribute $2,500 and you're in the 22% federal tax bracket, you save roughly $550 in federal taxes alone. Add state income tax and payroll taxes, and your actual savings could be $700 or more. That's money back in your pocket just by shifting how you pay for medical costs you'd pay for anyway.

Keep in mind that lower contributions mean lower tax savings, but also lower risk of losing money at year-end. Many people contribute $1,000 to $1,500 to cover predictable costs like copays and prescriptions while staying conservative about what they might not use.

The Use-It-or-Lose-It Rule and Carryover

This is the most important rule to understand: money left in your Medical FSA at the end of the plan year is forfeited. You cannot roll it over to the next year, you cannot withdraw it, and you cannot get it back. If you contribute $2,500 and only spend $1,800, the remaining $700 is gone.

Some employers offer a grace period—usually 2.5 months into the next year—during which you can still spend money from the previous year's account. A few employers also allow you to carry over up to $610 (the 2024 limit) to the next year, but this is less common and you need to check your specific plan. Most plans have neither option, so the money truly disappears.

This rule is why estimating your actual medical spending is critical. Look at what you spent on copays, prescriptions, and dental work over the past year, and use that as your baseline. If you're unsure, contribute less rather than more—you can always adjust during the next open enrollment.

How to Use Your Medical FSA

Most employers issue a debit card linked to your FSA account. You use it like a regular debit card at pharmacies, doctor's offices, and other healthcare providers. The card is declined if you try to use it for ineligible expenses, so there's a built-in check against mistakes.

For expenses the card won't cover—like dental work billed directly to you, or reimbursement from an out-of-network provider—you submit a claim form with a receipt. Your employer's benefits administrator reviews it and deposits the reimbursement into your bank account, usually within one to two weeks. Keep all receipts for at least three years in case of an audit.

You can check your account balance anytime through your employer's benefits portal or by calling the FSA administrator. This helps you track how much you have left to spend before year-end and plan your remaining medical care accordingly.

Who Can Open a Medical FSA

You must be enrolled in your employer's health insurance plan to open a Medical FSA. You cannot have a Medical FSA if you're on Medicare, covered by your spouse's plan only, or not enrolled in any health plan. Self-employed people and employees of very small employers may not have access to an FSA through their workplace.

If your employer offers a Medical FSA, enrollment is voluntary—you don't have to open one. Some people skip it because they're unsure about their medical spending or worried about losing money. Others open one because the tax savings are worth the risk, especially if they have predictable costs like regular prescriptions or dental work.

If you leave your job, you lose access to your FSA. Any unspent money in the account is forfeited immediately. This is another reason to be conservative with your contribution amount if you think you might change jobs during the year.

Medical FSA vs. Health Savings Account

A Health Savings Account (HSA) is different from a Medical FSA in important ways. An HSA is only available if you're enrolled in a high-deductible health plan, and unlike an FSA, unused money rolls over to the next year indefinitely. You can also invest HSA money and withdraw it for non-medical expenses after age 65 without penalty (though you'll pay taxes on non-medical withdrawals).

A Medical FSA has no investment option and no rollover, but it doesn't require a high-deductible plan and the contribution limits are slightly higher. If your employer offers both, you cannot open both in the same year—you have to choose one. If you have an HSA, you can still open a limited-purpose FSA that only covers dental and vision expenses.

The choice depends on your health plan type and how confident you are about your medical spending. HSAs are better if you want to keep money year to year and have flexibility. Medical FSAs are better if you have predictable annual costs and want the simplest option.

Frequently Asked Questions

What happens to my FSA money if I don't use it by the end of the year?

The money is forfeited and goes back to your employer. You cannot roll it over, withdraw it, or get it back in any form. Some employers offer a grace period of up to 2.5 months into the next year to spend the previous year's money, but most do not. Check your plan documents to see if yours does.

Can I change my FSA contribution amount during the year?

No, except after a may have access to life event like marriage, divorce, birth of a child, loss of other health coverage, or a significant change in your employer's plan. Outside of these events, you're locked into your contribution amount until the next open enrollment period.

Can I use my FSA debit card to buy over-the-counter pain relievers or cold medicine?

Not without a prescription. As of 2020, over-the-counter medications are only may be able to access if your doctor writes a prescription for them. The debit card will be declined if you try to buy them without one. Prescription medications are always may be able to access.

What if my employer doesn't offer a Medical FSA?

You cannot open one on your own—FSAs are only available through employers. If you have a high-deductible health plan, you may be able to open an HSA, which offers similar tax advantages and more flexibility. Otherwise, you pay for medical expenses with after-tax money.

Do I need receipts to use my FSA debit card?

For most transactions, the debit card works without a receipt. However, your FSA administrator may request receipts after the fact to verify that charges were may be able to access. Keep all receipts for at least three years. If you submit a claim form for reimbursement, you must include a receipt.