A medical FSA is a workplace account that lets you set aside pre-tax money to pay for out-of-pocket healthcare costs

A Flexible Spending Account (FSA) for medical expenses is an account your employer offers that holds money you contribute before taxes are taken out of your paycheck. You use that money to pay for healthcare costs that your insurance doesn't cover or that you have to pay upfront — copays, deductibles, prescriptions, dental work, vision care, and many other medical expenses. Because the money goes in before taxes, you pay less in federal income tax and payroll taxes that year.

The account is "use it or lose it," meaning money you don't spend by the end of the plan year generally doesn't roll over to the next year. Your employer sets the plan year, which often runs January through December but may run on a different schedule. You decide how much to contribute each year, and that amount is deducted from your paycheck in equal installments throughout the year.

Key Takeaways

  • Medical FSA contributions come out of your paycheck before taxes, which reduces your taxable income and the taxes you owe that year.
  • You can use FSA money for copays, deductibles, prescriptions, dental care, vision care, and other may have access to medical expenses your insurance doesn't cover.
  • Money left unspent at the end of the plan year is forfeited, so you need to estimate carefully how much you will actually use.
  • You can only enroll in or change your FSA contribution during your employer's open enrollment period, or if you have a may have access to life event like a birth or job loss.
  • You access the money through a debit card, reimbursement request, or direct payment to providers, depending on how your employer's plan works.

How the tax savings work

When you contribute to a medical FSA, that money is deducted from your gross pay before federal income tax, Social Security tax, and Medicare tax are calculated. This means your taxable income for the year is lower, so you owe less in taxes overall.

For example, if you earn $50,000 a year and contribute $2,500 to your medical FSA, your taxable income becomes $47,500. You pay income tax and payroll taxes on $47,500 instead of $50,000. The exact tax savings depends on your tax bracket and local taxes, but the savings are real — you're spending pre-tax dollars on healthcare instead of after-tax dollars.

This is different from using after-tax money to pay medical bills. If you paid those same $2,500 in medical costs with money you'd already paid taxes on, you'd have to earn more than $2,500 to cover it, depending on your tax rate.

What expenses you can pay for with FSA money

The IRS maintains a list of may have access to medical expenses that FSA money can cover. Common ones include copays and coinsurance, deductibles, prescription medications, insulin and diabetes supplies, dental work, orthodontia, eyeglasses and contact lenses, hearing aids, and physical therapy. Over-the-counter medications like pain relievers and allergy medicine also may have access to, as do bandages, crutches, and other medical supplies.

Some expenses do not may have access to. Cosmetic procedures, gym memberships, vitamins (unless prescribed by a doctor), and general wellness products are not covered. Health insurance premiums themselves are not covered, though you can use FSA money for costs your insurance requires you to pay out of pocket.

Your employer's plan document will specify which expenses are covered under your particular FSA. If you're unsure whether something qualifies, ask your plan administrator or check your plan's website before you spend the money.

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

Money you don't spend by the end of your plan year is forfeited — you lose it. This is the biggest risk of an FSA. If you contribute $2,500 but only spend $1,800, the remaining $700 disappears. You cannot roll it over to next year or cash it out.

Some employers offer a grace period of up to 2.5 months after the plan year ends, during which you can still spend money from the previous year's account. Not all employers offer this, so check your plan documents. A few employers also allow a small carryover — typically $570 or less per year, depending on IRS limits — but this is less common.

Because of this rule, you should contribute only what you reasonably expect to spend. Overestimating means losing money; underestimating means paying for medical costs with after-tax dollars. Many people estimate based on their actual medical spending from the previous year, plus any planned expenses they know are coming.

When you can enroll and make changes

You can enroll in a medical FSA or change your contribution amount only during your employer's open enrollment period, which is usually once a year. Most employers hold open enrollment in the fall for a plan year starting January 1, but the timing varies by employer.

Outside of open enrollment, you can change your FSA contribution only if you have a may have access to life event. These include marriage, divorce, birth or adoption of a child, loss of health insurance coverage, a significant change in your spouse's benefits, or a substantial change in your healthcare costs. You typically have 30 to 60 days after the event to make changes, depending on your employer's rules.

If you miss open enrollment and have no may have access to event, you're locked into your current contribution (or out of the FSA entirely if you didn't enroll) until the next open enrollment period. This is why it's important to pay attention to your employer's enrollment deadlines.

How you access the money

Your employer determines how you access FSA funds. Most plans issue a debit card linked to your FSA account that you can use at pharmacies, doctors' offices, and other healthcare providers. The card works like a regular debit card, but it only works for may have access to medical expenses.

Some plans require you to pay out of pocket and then submit a reimbursement request with receipts to your plan administrator, who then sends you a check or direct deposit. This takes longer but gives you documentation of what you spent. A few plans let you pay providers directly through the plan's website or app.

Keep receipts for all FSA purchases. If you use the debit card, the plan administrator may ask you to prove that a purchase was for a may have access to expense. If you can't provide proof, you may have to repay the money to the account.

FSA vs. other healthcare savings accounts

An FSA is different from a Health Savings Account (HSA), which is available only if you have a high-deductible health plan. HSAs let you carry money over year to year, so there's no use-it-or-lose-it rule. HSAs also let you invest the money and withdraw it tax-free in retirement for any expense, not just medical ones.

A Dependent Care FSA is a separate account for childcare and adult care expenses, not medical care. Some employers offer both types of FSA.

If your employer offers an HSA and you're may be able to access, compare the two. An HSA is usually better if you expect to have low medical expenses and want to save long-term. An FSA is useful if you have predictable annual medical costs you want to pay with pre-tax dollars.

Frequently Asked Questions

Can I use my FSA money for my spouse or children?

Yes. FSA money can pay for may have access to medical expenses for you, your spouse, and any dependents you claim on your tax return. You don't have to be the one receiving the care — the account holder can pay for anyone in the family's medical costs.

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

You lose access to the account. Money you've already contributed but not spent is forfeited. Some employers offer a continuation period (usually 60 to 90 days) during which you can submit claims for expenses you incurred while employed, but you cannot add new contributions or use the card after you leave.

Can I change my FSA contribution mid-year?

Only if you have a may have access to life event like a birth, marriage, divorce, or loss of health insurance. A change in your income or a desire to contribute more or less is not a may have access to event. You're locked into your contribution amount until the next open enrollment period.

What if I don't spend all my FSA money by the end of the year?

The money is forfeited. Some employers offer a grace period of up to 2.5 months after the plan year ends to spend remaining funds, but this is optional. Check your plan documents to see if your employer offers a grace period or carryover option.

Can I withdraw FSA money for non-medical expenses?

No. If you use FSA money for non-may have access to expenses, you have to repay that money to the account, and you may owe taxes and penalties on it. The debit card is designed to block non-medical purchases, but if you use reimbursement, you're responsible for only submitting may have access to expenses.