What an FSA actually does with your money

A Flexible Spending Account lets you set aside pre-tax dollars from your paycheck to pay for medical expenses your insurance doesn't cover. Your employer holds the account, deducts your contributions before taxes are calculated, and you withdraw money as you need it throughout the year. The tax savings come from not paying federal income tax, Social Security tax, or Medicare tax on that money — so a $2,500 FSA contribution might save you $600 to $800 in taxes, depending on your tax bracket.

The money sits in an account managed by a third-party administrator (often the same company that handles your health insurance). You don't invest it or earn interest on it. When you incur a medical expense, you submit a receipt or claim form, and the administrator pays the provider or reimburses you directly. The account resets every January, and any money you don't use by the end of the year is forfeited — this is the "use it or lose it" rule that makes FSA planning crucial.

Key Takeaways

  • FSA contributions come from your paycheck before taxes are taken out, which reduces your taxable income and saves you money on federal, Social Security, and Medicare taxes.
  • You choose how much to contribute during your employer's open enrollment period, and that amount is locked in for the entire year unless you have a may have access to life event.
  • You can only withdraw money for expenses that meet IRS rules for medical care — copays, deductibles, prescriptions, and dental work, but not insurance premiums or over-the-counter items without a prescription.
  • Any money left in your FSA at the end of the year is forfeited; you cannot carry it over or get it back, so estimating your spending accurately is essential.
  • You must submit receipts or claim forms to the FSA administrator to prove the expense is may be able to access before you receive reimbursement.

How much you can contribute and when

The IRS sets an annual limit on FSA contributions. For 2024, that limit is $3,200 per person per year (this amount changes annually, so check with your employer for the current year). You decide your contribution amount during your employer's open enrollment period, which usually happens once a year in the fall for coverage starting January 1. Your employer then deducts that amount in equal installments from each paycheck throughout the year.

You cannot change your contribution mid-year unless you experience a may have access to life event — marriage, divorce, birth or adoption of a child, loss of other health coverage, or a significant change in your spouse's employment or benefits. If you change jobs, your FSA ends with your old employer, and you cannot transfer the balance to a new FSA. Any unused money is forfeited when you leave.

What expenses the IRS allows you to pay for

The IRS maintains a detailed list of may be able to access medical expenses. Common ones include copays and coinsurance, deductibles, prescription medications, dental work (cleanings, fillings, orthodontics), vision care (glasses, contacts, exams), and medical equipment (crutches, wheelchairs, hearing aids). Mental health counseling and physical therapy also may have access to. Over-the-counter medications like ibuprofen or cold medicine do not may have access to unless you have a prescription from your doctor.

Health insurance premiums themselves do not may have access to for FSA reimbursement, nor do cosmetic procedures, gym memberships, or vitamins. If you are unsure whether an expense qualifies, ask your FSA administrator before you pay — they can tell you whether a specific item or service is may be able to access under IRS rules. Submitting a claim for an ineligible expense can trigger an audit of your account.

How to submit claims and get reimbursed

When you incur a medical expense, you have two main ways to access your FSA money. Some employers issue an FSA debit card that works like a credit card at pharmacies, doctor offices, and dental clinics. You swipe it, and the charge comes directly from your FSA balance. Other employers require you to pay out of pocket and then submit a claim for reimbursement.

To submit a claim, you gather your receipt or explanation of benefits (EOB) from your provider, fill out a claim form (usually available online through your FSA administrator's website or app), and submit it. The administrator reviews the claim to confirm the expense is may be able to access, then either reimburses your bank account or pays the provider directly. This process typically takes one to two weeks. Keep all receipts for at least three years in case the IRS or your employer audits your account.

The "use it or lose it" rule and how to plan around it

Money left in your FSA at the end of the calendar year does not roll over to the next year — it is forfeited. This is a federal rule, not a choice by your employer. The only exception is a small grace period: some employers allow a 2.5-month carryover (until March 15 of the following year) to spend remaining funds, but this is optional and not all employers offer it. Check your employer's plan documents to see if this applies to you.

To avoid losing money, estimate your medical spending conservatively. Review your past year's expenses: copays, prescriptions, dental work, vision care, and any recurring treatments. Add a small buffer for unexpected costs, but do not overestimate. If you realize mid-year that you will not spend your full contribution, you cannot reduce it unless you have a may have access to life event. Some people deliberately contribute a smaller amount to avoid forfeiture.

FSA versus HSA: which account to choose

If your employer offers both an FSA and a Health Savings Account (HSA), they serve different purposes. An FSA is "use it or lose it" and available to anyone with a health plan. An HSA requires a high-deductible health plan (HDHP), allows you to carry money over year to year, and lets you invest the balance like a retirement account. HSAs have lower annual contribution limits than FSAs but offer more long-term flexibility.

You cannot contribute to both an FSA and an HSA in the same year — the IRS prohibits this. If you have access to an HSA and a high-deductible plan, an HSA is usually the better choice because you keep the money and can invest it. If you have a traditional health plan with lower deductibles, an FSA lets you save on taxes for predictable medical costs. Ask your employer's benefits team which accounts you are may be able to access for and compare the contribution limits and rules.

What happens to your FSA when you leave your job

When you leave your employer, your FSA account closes immediately. Any unused balance is forfeited — you cannot take it with you or transfer it to a new employer's FSA. If you have already submitted claims but not yet been reimbursed, contact your FSA administrator before you leave to ensure those claims are processed. After you leave, you typically have 60 to 90 days to submit any remaining claims for expenses you incurred while employed.

If you move to a new job with FSA coverage, you start fresh with a new account and a new contribution amount. You cannot carry over unused funds, so plan your final contribution carefully in your last year. If you are between jobs or moving to a job without FSA coverage, you may be able to continue your FSA through COBRA, though you will pay the full premium yourself plus administrative fees, which is usually not cost-effective.

Frequently Asked Questions

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

Most pharmacies and medical providers accept FSA debit cards, but not all. Some smaller practices or specialty clinics may not have the infrastructure to process FSA payments. If a provider declines your card, you can pay out of pocket and submit a claim for reimbursement. Always ask the provider in advance if they accept FSA payments to avoid surprises at checkout.

What happens if I submit a claim for an ineligible expense?

The FSA administrator will deny the claim and ask you to resubmit with an may be able to access expense or documentation showing the expense qualifies. If you dispute the denial, you can appeal through your employer's benefits department. Repeated claims for ineligible expenses can trigger an audit of your entire account, so verify may be able to access before submitting.

Can I get my unused FSA money back if I don't spend it?

No. The IRS rule is firm: unused FSA money is forfeited at the end of the year. Some employers offer a grace period until mid-March to spend remaining funds, but this is optional. There is no way to recover forfeited money or have it refunded to you.

Do I need receipts to prove I spent FSA money?

Yes. When you submit a claim, you must provide a receipt or explanation of benefits showing the date, amount, and type of expense. If you use an FSA debit card at a pharmacy or doctor's office, the transaction is usually documented automatically, but keep your receipts anyway. The IRS can audit FSA accounts, and you need proof that expenses were may be able to access and actually occurred.

Can I change my FSA contribution if my circumstances change mid-year?

Only if you have a may have access to life event: marriage, divorce, birth or adoption, loss of other health coverage, or a significant change in your spouse's job or benefits. Routine changes like a raise or deciding you spent less than expected do not may have access to. If you do have a may have access to event, you typically have 30 to 60 days to make changes, so notify your employer's benefits team immediately.