Flex spending accounts do not roll over—money you don't use by December 31 is forfeited

A flexible spending account (FSA) is a tax-advantaged account where you set aside pre-tax dollars to pay for may be able to access medical and dependent care expenses. The critical rule is the use-it-or-lose-it provision: any balance remaining in your account on December 31 goes back to your employer. You cannot carry the money forward to the next year, and you cannot withdraw it as a refund.

This is fundamentally different from a health savings account (HSA), which does roll over indefinitely. An FSA is designed to be spent within the calendar year. If you contribute $2,500 and spend only $1,800 by year end, the remaining $700 disappears. Your employer keeps it or uses it to offset plan administration costs.

The only exception is a limited grace period that some employers offer: you may have until March 15 of the following year to spend the previous year's balance. Not all employers provide this, and it is optional on their part. You need to check your plan documents or ask your benefits administrator whether your specific FSA includes a grace period.

Key Takeaways

  • Money left in an FSA on December 31 is forfeited to your employer; there is no rollover to the next calendar year.
  • A grace period of up to 2.5 months into the new year is available only if your employer's plan includes it, and you must confirm this with your benefits team.
  • Health savings accounts (HSAs) do roll over year to year, but FSAs do not, making them fundamentally different savings vehicles.
  • The use-it-or-lose-it rule means you should estimate your medical and dependent care expenses carefully when you enroll in an FSA.

How the use-it-or-lose-it rule actually works

When you enroll in an FSA during your employer's open enrollment period, you elect a dollar amount to contribute for the coming year. That money is deducted from your paycheck in equal installments throughout the year, before taxes are taken out. You can then submit claims for may be able to access expenses—copays, deductibles, prescription medications, dental work, vision care, and dependent care costs like daycare.

On December 31, your FSA plan administrator tallies what you spent and what remains. Any unspent balance is gone. There is no carryover, no rollover option, and no way to reclaim it. This is a federal rule built into the FSA structure, not something individual employers can override (except for the grace period, which is optional).

The reason for this rule is tax law. FSAs are funded with pre-tax dollars, which means you save money on income and payroll taxes. In exchange, the IRS requires that the account be used for its intended purpose within the year. The use-it-or-lose-it provision prevents people from treating FSAs as general savings accounts.

The grace period: what it is and whether you have one

Some employers offer a grace period that extends the spending window into the new year. If your plan includes one, you typically have until March 15 to spend money from the previous year's FSA balance. This is not automatic—it is an optional feature that your employer must elect when setting up the plan.

The grace period applies only to the previous year's balance. Money you contribute in the new year is subject to its own December 31 important date. So if you had $500 left over from 2024 and your plan has a grace period, you can spend that $500 through March 15, 2025. But any 2025 contributions must be spent by December 31, 2025.

To find out whether your FSA includes a grace period, check your plan documents or contact your employer's benefits administrator directly. Do not assume you have one. Many employers do not offer it, and the only way to know is to ask.

Why FSAs are different from HSAs

A health savings account (HSA) is often confused with an FSA because both are tax-advantaged accounts for medical expenses. The key difference: HSA balances roll over year to year indefinitely. Money you contribute to an HSA in 2024 can sit in the account until 2034 or beyond, earning interest or investment returns. There is no use-it-or-lose-it rule.

HSAs are available only if you are enrolled in a high-deductible health plan (HDHP). FSAs are available through most employer health plans, regardless of deductible level. If you have access to both, an HSA is generally the better choice for long-term savings because the money does not expire.

Some people maintain both an FSA and an HSA. In that case, you can use your FSA for when ready expenses and let your HSA grow as a backup fund. But you cannot contribute to both in the same year if you are using the FSA for dependent care expenses—dependent care FSAs have different rules.

Strategies to avoid losing money at year end

The best approach is to estimate conservatively when you enroll. Look at your actual medical and dependent care expenses from the previous year, then contribute slightly less than that amount. If you spent $1,500 on copays and prescriptions in 2024, contribute $1,400 to your 2025 FSA rather than $2,000. This reduces the risk of forfeiture.

Track your spending throughout the year. Most FSA plans offer a mobile app or online portal where you can see your balance and submitted claims in real time. Check it quarterly so you know how much you have left to spend. If you notice a large balance in October or November, you still have time to schedule dental work, vision exams, or other may be able to access services before year end.

Keep receipts and documentation for all medical and dependent care expenses, even if you do not submit claims when ready. You can submit claims after the year ends (or after the grace period ends, if your plan has one), so you do not have to spend the money in real time. You just have to incur the expense and document it before the important date.

If you have a dependent care FSA, remember that may be able to access expenses are narrower than medical FSA expenses. Dependent care FSAs cover daycare, preschool, and after-school care for children under 13, but not tuition for K-12 schools or college. Plan accordingly so you do not overestimate what you will spend.

What happens to forfeited FSA money

When you forfeit money in an FSA, it does not go to a general fund or get donated to charity. It goes back to your employer. Employers can use forfeited FSA funds to offset the cost of administering the plan—paying the plan administrator, processing claims, and maintaining the system. Any remaining balance after administration costs may be returned to the employer as a cost reduction.

This is why employers are willing to offer FSAs even though they create administrative work. The forfeited money effectively subsidizes the plan. From the employer's perspective, some employees will not spend their full contribution, which lowers the overall cost of offering the benefit.

You cannot recover forfeited money under any circumstances. There is no appeal process, no exception for hardship, and no way to request a refund. Once December 31 passes (or March 15 if your plan has a grace period), the money is gone.

Frequently Asked Questions

Can I change my FSA contribution amount during the year?

You can change your contribution only if you have a may have access to life event: marriage, divorce, birth of a child, loss of health coverage, or a significant change in dependent care costs. A change in your own medical needs is not a may have access to event. If you want to adjust your contribution, you must wait for the next open enrollment period.

What if I leave my job before the year ends?

When you leave your job, your FSA coverage typically ends on your last day of employment. Any unspent balance is forfeited, even if you leave in November. Some employers allow you to submit claims for expenses incurred before your departure date, but you must do so within a set timeframe (usually 60 to 90 days). Check with your benefits administrator about the claims important date.

Can I use my FSA for my spouse's medical expenses?

Yes, you can use your FSA to pay for may be able to access medical expenses for your spouse and any tax-dependent children, even if they are not on your health insurance plan. The expense must be may be able to access under the FSA rules, and you must have a receipt or documentation. Dependent care FSAs have different rules and cover only care for children under 13.

Does the grace period explore to dependent care FSAs?

Yes, if your employer offers a grace period, it applies to both medical and dependent care FSAs. However, dependent care FSAs have stricter rules about what counts as an may be able to access expense, so confirm with your plan administrator what you can spend the grace period money on.

What counts as an may be able to access FSA expense?

Medical FSA expenses include copays, deductibles, prescription medications, dental work, vision care, hearing aids, and certain medical equipment. Dependent care FSA expenses include daycare, preschool, and after-school care for children under 13. Over-the-counter medications are may be able to access only if you have a prescription. Cosmetic procedures and general wellness expenses are not may be able to access.