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What Is a Flexible Spending Account and How Does It Work?

FSAs can be a lifesaver when paying for out-of-pocket medical costs. But there are IRS rules you have to follow.

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A flexible spending account is a health care savings fund offered by employers. It allows you to lower your taxable income by setting aside pre-tax dollars for eligible health care expenses, such as prescription drugs.

FSAs have specific rules you must follow, to best leverage them. For example, FSAs have annual contribution limits and generally require you to use all of your set aside funds within a calendar year. 

Below is everything you need to know to ensure you get the most out of your coverage.

What is a flexible spending account?

An FSA is a tax-advantaged account that lets you contribute and use pre-tax dollars to pay for eligible medical expenses. You don’t need any specific type of health plan to qualify for an FSA, but your employer must offer one in order for you to enroll.

When you sign up for an FSA, you declare your contributions for the year. Your FSA is then prefunded on the first day of the plan, and your contributions are broken down into installments that your employer will automatically withdraw from your paycheck.

FSAs can be an effective way to pay for health-related expenses such as:

  • Birth control
  • Crutches
  • Eyeglasses and contact lenses
  • Insulin
  • Over-the-counter drugs
  • Pregnancy tests
  • Prescribed medicines
  • Breastfeeding pumps
  • Dental treatments
  • Chiropractors
  • Hearing aids 

The IRS offers a comprehensive list of eligible medical expenses. But note that you can’t use your FSA to pay for insurance premiums.

Below are three main types of FSAs, along with 2024 contribution limits:

Type of FSAWhat it coversMaximum contribution
Health Care FSA or HCFSAAny eligible medical costs, like medical devices or prescriptions$3,200
Limited Health Expense Health Care FSA, or LEX HCFSAAny eligible dental and vision expenses$3,200
Dependent Care FSAAny child or adult dependent care expenses$5,000 per household or $2,500 if married but filing separately

How does an FSA work?

A flexible spending account can help you plan for predictable medical expenses -- and sometimes unexpected costs -- throughout the year. Here’s what to expect if you sign up for an FSA:

Choose how much to contribute. At the beginning of the plan year, when you’re enrolling in your benefit plans, you’ll decide how much money you want to put in your FSA for the year. In some cases, employers may also contribute to flexible spending accounts. In 2024, the maximum amount an employee can contribute to an FSA is $3,200. 

Your plan begins. The amount you designate for the year is available in full on the first day of the year. Your employer will then take contributions out of your paycheck in equal installments each pay period. Your employer may also contribute to your account.

Spend your money or submit a claim, as needed. Some providers will give you an FSA debit card, which allows you to cover eligible expenses at the time of purchase. Otherwise, you’ll pay the costs out-of-pocket and submit a claim to your FSA provider, along with the receipt for your purchase.

Use your money before the end of the year. You could lose the money in your FSA if you don’t use it by Dec. 31. Some employers offer a grace period to use any excess funds. Others might allow you to roll over a portion of your FSA money -- if your employer does, you can roll over only up to $610 for 2023.

Who qualifies for an FSA?

You may be eligible for an FSA if you are an employee of a company that offers this type of account. Your employer may have specific rules or eligibility criteria to qualify for an FSA. Not all employers offer flexible spending accounts.

A healthcare FSA can help you pay for medical expenses from year to year, such as regular over-the-counter medicine costs. It alsoAn FSA allows you to plan ahead and put pre-tax dollars toward anticipated expenses.

What makes a product FSA eligible?

The IRS determines what medical and health care expenses are covered by an FSA. In addition to costs such as over-the-counter meds and medically related upgrades to your home or car, this includes copays and deductibles charged to you over the course of a year.

It’s important to spend all your allocated funds in your company-provided FSA within a calendar year. Unlike a health savings account (HSA), money in an FSA doesn’t always roll over to the next year. 

How much should you contribute to an FSA?

The first step in determining how much money to put into your FSA is to calculate your out-of-pocket medical expenses for that year. This can be tricky since you can’t always anticipate illnesses and injuries. Looking back at the previous year’s expenses is one way to try to calculate your out-of-pocket spend. 

For 2024, the IRS has set the FSA annual contribution limit to $3,200 for individuals. So if you anticipate your medical expenses will be $267 each month, it may be best to max out your FSA contributions in order to cover those expected costs with pre-tax dollars. 

Conversely, if you expect your medical expenses will be lower, put less into your FSA so you don’t wind up with a large amount of money at the end of the year that you’ll either need to spend on eligible expenses or forfeit.

Can I pay for my spouse’s expenses from my FSA?

FSA funds can be used on eligible medical expenses for individuals, as well as their spouses and listed dependents. Your spouse can also contribute up to $3,200 to their FSA in 2024 to help cover family medical expenses.

Don’t contribute more into individual FSAs than you and your partner think you’ll need for costs like copayments, drugs or medical equipment. Health insurance premiums cannot be paid for by an FSA.

Pros and cons of an FSA

Pros

  • Tax savings. You can reduce your taxable income and lower your tax bill by using pre-tax dollars to pay for eligible medical expenses.

  • Convenient. FSAs can make it easier to budget for out-of-pocket health care costs.

  • Employer contribution. Some employers may contribute to your FSA, providing additional funds to cover eligible expenses.

Cons

  • You could lose your funds if you don’t spend them. Unless your employer lets you roll over your FSA funds, you may lose whatever you don’t spend by the end of the year.

  • Reimbursement limitations. FSAs have strict eligibility requirements and may not reimburse you for all medical expenses, such as cosmetic procedures and certain over-the-counter medications.

  • Contributions are fixed. You have to estimate your FSA contribution before the beginning of the plan year. If you have unexpected medical expenses, you can’t increase your contributions.

What’s the difference between an FSA and an HSA?

A flexible spending account and health savings account are both tax-advantaged accounts you can use to pay for eligible medical expenses. However, there are key differences to note:

  • Eligibility. To qualify for an FSA, you must be an employee of a company that offers one. However, anyone with a high-deductible health plan, or HDHP, can open an HSA.
  • Contribution limits. For 2024, you can contribute up to $3,200 for an FSA. For an HSA, you can contribute up to $4,150 (for individuals) and up to $8,300 (for family plans) for 2024.
  • Pre-tax or after-tax contributions. You contribute pre-tax to an FSA, while you can contribute pre-tax or after-tax to an HSA. 
  • Rollover rules. With an FSA, you may forfeit the remainder of your funds at the end of the year, or if your employer lets you roll over funds, you can roll over a portion (for 2023, the maximum rollover limit is $610). HSAs don’t have this limitation. Instead, you can roll over the full amount from year to year. 
  • Investment options. You can invest your HSA funds to potentially grow your money even more -- a benefit you can’t explore with an FSA. 

What is a Limited Purpose FSA (LPFSA)? 

A limited purpose flexible spending account is a tax-advantaged savings account that allows you to pay for eligible dental and vision costs. 

Like an FSA, an LPFSA can be opened only if it is provided by your employer. Unused funds earmarked for an LPFSA are also subject to being forfeited at the end of the plan year. 

The difference between an FSA and LPFSA is that the latter can be paired with a health savings account to maximize pre-tax dollars set aside for health costs. While FSAs cover eligible medical expenses in addition to dental and vision costs, they can’t be paired with an HSA account.

The bottom line

An FSA is a flexible spending account offered through employers to help employees save for health care costs. You contribute pre-tax to an FSA, and depending on your employer, may be able to roll a portion of unused funds over for the next year. pay for eligible medical expenses. FSAs can be a valuable benefit for budgeting the cost of medical expenses, but it’s important to understand the specific rules of your FSA and to plan accordingly to ensure that you use all of the funds in your account before the end of the plan year.

FAQs

At the beginning of the plan year, you decide how much you want to add to your FSA, up to $3,200 for 2024. Then, your employer will break this amount into regular installment that will be pulled from your paycheck, pre-tax, during the year. Your employer might also contribute to your flexible spending account.

For 2024, employees can contribute up to $3,200 to their health care FSA before taxes, through payroll deductions. If you’re married, your spouse can also contribute up to $3,200 to their own FSA through their employer.

In general, you have to spend the money in your FSA account or you lose it at the end of the year. However, some employers offer a grace period that allows employees to spend FSA funds for a limited time after the end of the plan year. Some employers also let you carry over a portion of your funds into the following year. For 2023, you can roll over up to $610 in your FSA, if your employer offers this option.

Lizzie Nealon is a contributor for CNET and Bankrate. Lizzie earned her bachelor's degree in political science from Clemson University. At Clemson, she co-founded a campus publication called the Sensible Tiger that made news and politics digestible to college students. This experience instilled her passion for helping audiences navigate complex personal finance topics. She enjoys partially completing New Yorker crosswords, finding the best local restaurants and reading biographies in her free time.
Danni Santana has spent seven years as an editor and business journalist covering industries like sports, retail, restaurants, and now personal finance. Most recently he worked as a retail editor at Business Insider. He is a graduate of the Craig Newmark Graduate School of Journalism at CUNY. His biggest loves outside of the newsroom include, running, cooking, playing video games and collecting sneakers.
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