Flex spending accounts do not roll over—money you don't use by the end of the plan year is forfeited

A flexible spending account (FSA) is a tax-advantaged account where you set aside pre-tax dollars to pay for 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 (or whenever your plan year ends) 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 different from a health savings account (HSA), which does roll over year to year. FSAs are designed to encourage you to estimate your expenses carefully and spend down your balance before the deadline. If you miscalculate and leave money behind, that money is gone.

Key Takeaways

  • FSA funds expire on December 31 (or your plan year end date) and do not carry over to the next year under any circumstances.
  • Your employer keeps any unused balance; you cannot withdraw it, transfer it, or get it refunded to you.
  • A limited grace period of up to 2.5 months may allow you to spend down your balance after the plan year ends, but this is optional and varies by employer.
  • You can change your FSA contribution amount only during open enrollment or if you have a may have access to life event like marriage, birth, or job loss.
  • Submitting receipts and claims before the deadline is your responsibility—the account does not automatically spend down.

The grace period: a small window to spend remaining funds

Some employers offer a grace period that extends the spending deadline by up to 2.5 months into the next calendar year. If your plan includes a grace period, you can submit claims for expenses incurred during that window and draw from your previous year's FSA balance. This is not automatic—you must check your plan documents or ask your benefits administrator whether your employer offers it.

Grace periods are optional and not all employers provide them. Even if yours does, the grace period applies only to expenses you actually incurred during that time. You cannot use it to reimburse yourself for expenses from years past. Once the grace period ends, any remaining balance is forfeited.

How to avoid losing money: estimate conservatively

The best strategy is to estimate your annual medical and dependent care expenses as accurately as possible and contribute only what you are confident you will spend. Review your previous year's receipts, factor in known upcoming expenses (dental work, vision exams, prescriptions), and add a small buffer for unexpected costs.

If you are unsure whether an expense qualifies, check the IRS list of may be able to access medical expenses or ask your FSA administrator before you contribute. Common may be able to access expenses include copays, deductibles, prescription medications, dental work, vision care, and dependent care (childcare or adult day care). Ineligible expenses—like cosmetic procedures, gym memberships, or over-the-counter medications without a prescription—cannot be reimbursed, so do not count them in your estimate.

Underestimating is safer than overestimating. If you contribute too much and cannot spend it all, you lose the difference. If you contribute too little, you simply pay for additional expenses out of pocket—no penalty, no loss.

Submitting claims before the deadline is your responsibility

FSA accounts do not automatically reimburse you. You must submit claims or request reimbursement for may be able to access expenses you have already paid out of pocket. Keep all receipts and documentation. Your FSA administrator will have a deadline for submitting claims—often 60 to 90 days after the plan year ends—and claims submitted after that date will be denied, even if you have a remaining balance.

Do not assume that because you have money in the account, it will be spent automatically. If you incur an expense in December but do not submit the claim until February, you may miss the deadline and forfeit both the expense reimbursement and the balance. Submit claims promptly, especially as the year-end deadline approaches.

Life events that let you change your contribution mid-year

You can adjust your FSA contribution only during your employer's open enrollment period (usually once a year in the fall) or if you experience a may have access to life event. These events include marriage, divorce, birth or adoption of a child, death of a spouse or dependent, significant change in dependent care costs, or loss of health coverage.

If your circumstances change mid-year and you realize you will not spend your full FSA balance, you cannot simply withdraw the money or reduce your contribution retroactively. You are locked into your election for the plan year unless you have a may have access to event. This is why starting with a conservative estimate matters.

FSA vs. HSA: why the rollover rules are different

A health savings account (HSA) is a separate product with different rules. HSA balances roll over year to year indefinitely—you can accumulate funds and use them whenever you need them. However, HSAs require enrollment in a high-deductible health plan (HDHP), and not all employers offer them.

FSAs are more common and do not require a specific health plan, but they come with the use-it-or-lose-it rule. If your employer offers both, an HSA is generally better for long-term savings because the money does not expire. An FSA makes sense if you have predictable annual medical expenses and want to reduce your taxable income in the short term.

What happens to forfeited FSA money

When you forfeit FSA funds, the money does not go to you, and it does not stay in a general company fund. Instead, it goes back to your employer, who can use it to offset the cost of administering the FSA program or reduce the employer's contribution to health insurance premiums. Some employers use forfeited funds to lower FSA administrative fees for all employees in the following year.

This is why FSAs are sometimes called "use-it-or-lose-it" accounts—the incentive is built into the system. The IRS allows this forfeiture rule to discourage over-contribution and to keep FSA administration costs reasonable.

Frequently Asked Questions

Can I roll over any FSA money to next year?

No. FSA balances never roll over to the next plan year under any circumstances. The only exception is a grace period, which some employers offer and which extends the spending deadline by up to 2.5 months. Even then, you can only spend the money on expenses incurred during the grace period, not carry it forward indefinitely.

What if I leave my job before using my FSA balance?

When you leave your job, your FSA coverage typically ends on your last day of employment. Any unused balance is forfeited immediately. You cannot take the money with you or transfer it to a new employer's FSA. If you are planning to leave, try to spend down your balance before your final day.

Can I get my FSA money back as a refund?

No. FSA funds are forfeited, not refunded. Once the plan year ends and your grace period (if any) expires, any remaining balance is gone. You cannot request a refund, withdrawal, or transfer to another account.

How do I know my plan year end date?

Your plan year end date is in your FSA plan documents, which your employer or benefits administrator should provide. Most plans run January 1 to December 31, but some employers use different dates. Check your benefits summary or ask your HR department to confirm your specific deadline.

Can I change my FSA contribution if I realize I contributed too much?

Only if you have a may have access to life event (marriage, birth, divorce, death, or significant change in dependent care costs). Otherwise, you are locked into your contribution for the entire plan year. This is why conservative estimates are important—you cannot reduce your contribution mid-year just because you overestimated your expenses.