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What Is an FSA and How Does It Work?

A Flexible Spending Account (FSA) is a type of savings plan offered through many employers that lets workers set aside pre-tax money for certain out-of-pocket healthcare costs. The basic concept is straightforward: instead of paying for medical expenses with after-tax dollars, you contribute money directly from your paycheck before taxes are taken out. This means you pay less in federal income taxes because your taxable income is reduced.

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Here's a practical example of how this works: If you earn $50,000 per year and contribute $2,500 to an FSA, your taxable income becomes $47,500. You don't pay federal income tax on that $2,500. Depending on your tax bracket, this could save you between $500 and $750 in taxes each year. That's real money back in your pocket.

The money you put into your FSA sits in an account that you control. When you have an eligible medical expense, you can withdraw funds from your FSA to pay for it. You don't need to wait for reimbursement from insurance—you can use the funds immediately. The employer typically provides a debit card or allows you to submit receipts for reimbursement.

According to the IRS, approximately 37 million Americans have access to FSA plans through their employers, though not all choose to participate. In 2023, the maximum amount workers could contribute to an FSA was $3,050 per year. This limit changes annually and is adjusted for inflation.

One important distinction: FSAs are different from Health Savings Accounts (HSAs) and Health Reimbursement Arrangements (HRAs), though all three serve similar purposes. Understanding these differences helps you make informed decisions about which accounts might work for your situation.

Practical Takeaway: An FSA is essentially a tax-advantaged savings tool for healthcare costs. By contributing pre-tax dollars, you reduce your overall tax burden while building funds specifically for medical expenses you know you'll have.

What Medical Expenses Can You Pay For With FSA Funds?

FSA funds can be used for a wide range of medical expenses, but not every healthcare cost qualifies. The IRS maintains a specific list of eligible expenses, and understanding this list is crucial because using FSA funds for ineligible expenses can result in taxes and penalties.

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Common eligible expenses include doctor visit copayments, prescription medications, dental work, vision care, and mental health counseling. If you need glasses or contact lenses, those are covered. Dental cleanings, fillings, and orthodontia all count. If you take prescription medications regularly, those expenses are eligible. Even over-the-counter medications like pain relievers and allergy medications can be paid for with FSA funds, as long as you have a prescription from your doctor.

The list of eligible expenses is quite extensive and includes:

• Medical equipment and supplies: blood pressure monitors, glucose monitors, bandages, crutches, hearing aids, and wheelchairs
• Therapy and rehabilitation: physical therapy, occupational therapy, and speech therapy
• Diagnostic services: lab tests, X-rays, and medical imaging
• Preventive care: vaccinations and screening tests
• Mental health services: therapy sessions and psychiatric treatment
• Dental expenses: fillings, crowns, root canals, extractions, and braces
• Vision care: eye exams, glasses, contact lenses, and surgery like LASIK
• Chiropractic care and acupuncture performed by licensed practitioners
• Weight loss programs if prescribed by a doctor for a specific medical condition
• Medical transportation costs to receive treatment

Expenses that typically do not qualify include cosmetic procedures not related to medical conditions, gym memberships (unless part of a doctor-prescribed weight loss program), vitamins and supplements without a medical condition requiring them, and general wellness products. Health insurance premiums themselves cannot be paid with FSA funds, though some exceptions exist for specific plan types.

A helpful approach is to check with your FSA plan administrator before making large purchases or trying unorthodox treatments. Most plans provide a list of eligible expenses, and many have customer service representatives who can answer specific questions about whether a particular expense qualifies.

Practical Takeaway: Keep records of all medical expenses throughout the year. Review the IRS list of eligible expenses on the official website or in your plan documents so you know what you can and cannot purchase with FSA funds. This prevents unexpected problems and maximizes your use of these funds.

The Annual Enrollment Period and How to Get Started

FSA plans operate on a calendar year basis, and workers can only enroll during a specific window called the Annual Enrollment Period, which typically occurs in the fall (usually October or November) for coverage beginning January 1st. If your employer offers an FSA, this is when you need to make your contribution decision for the coming year.

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The enrollment process involves deciding how much money to contribute to your FSA during the upcoming year. This requires some planning because you need to estimate your healthcare costs for the year ahead. Think about recurring expenses: Will you need regular prescriptions? Do you wear glasses and need annual exams? Are you planning dental work? What about therapy or ongoing medical treatment?

For example, if you know you take three prescription medications regularly and each costs $30 per month, that's $1,080 annually. If you have two dental visits per year at $150 each, that's $300. Annual eye exams and new glasses might cost $400. Adding these together, you might contribute $1,800 to your FSA. The exact amount depends on your personal healthcare situation.

To make this calculation, review your previous year's medical expenses if you have that information available. Look at insurance statements, receipts, and prescription records. Consider any planned expenses for the coming year—orthodontia, surgery, or other treatments you know are coming. Some people track their spending for a few months to get a sense of their average monthly medical costs.

During enrollment, your employer provides information about the FSA plan offered. Most employer plans are handled through payroll deduction, meaning your contribution comes directly from your paycheck across all pay periods during the year. If you're paid biweekly, and you want to contribute $2,400, that would be approximately $92 per paycheck.

If you experience a major life change—birth of a child, marriage, loss of employer health coverage—you may be able to make changes to your FSA contribution outside the normal enrollment period. These "qualifying events" vary by employer but typically include family status changes and changes in insurance coverage.

Practical Takeaway: Start planning your FSA contribution several weeks before your enrollment period begins. Review past medical expenses and estimate future costs realistically. Contributing too little means you don't take full advantage of tax savings; contributing too much means you might lose unused funds.

Understanding the Use-It-or-Lose-It Rule

The most important and often misunderstood rule about FSAs is the "use-it-or-lose-it" provision. This rule states that any money you contribute to your FSA that you don't use by the end of the plan year is forfeited—you lose it. This is not like a regular savings account where unused money rolls over to the next year. Understanding this rule is critical for making wise decisions about how much to contribute.

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However, there are some flexibility measures that employers may offer. Many plans now allow a "grace period" of up to 2.5 months into the following year. This means you have until mid-March of the next year to use funds you contributed in the previous year. For example, if you contributed money in 2024 for the 2024 plan year but didn't use all of it by December 31, 2024, you might still have until March 15, 2025 to spend it if your employer offers a grace period.

Some employers also offer a "carryover" option, allowing you to roll over up to $610 (as of 2024) of unused funds into the next plan year. This is different from a grace period—it's actual money that carries over. However, not all employers offer this option, and it's something you need to verify with your specific plan