Is an FSA use it or lose it?
Generally, yes: unused health flexible spending arrangement money can be forfeited after the applicable deadline. But your employer's plan may allow a limited carryover or a grace period. Those exceptions are not automatic. Check the written plan rules before assuming you must spend everything by December 31 or that your balance will move into next year.
U.S. guidance reviewed October 27, 2026. This guide concerns employer health FSAs, not dependent-care FSAs. Laws and plan guidance can change, and updates may take time to appear here. Confirm current details with your benefits administrator and the IRS. The cover is an AI-generated conceptual illustration.
Late October is a useful time to do this review: you still have time to find receipts, schedule needed care and ask questions without a last-minute shopping rush. The aim is to use benefits thoughtfully, not to buy things simply because a balance remains.
What are the three FSA deadlines to check?
Ask the administrator for three separate dates, preferably in writing:
- Plan-year end: when the current benefit year finishes. Not every plan follows the calendar year.
- Last date to incur an eligible expense: usually the plan-year end unless an applicable grace period extends it. An expense is generally incurred when care is provided, not simply when you pay a bill.
- Last date to submit the claim: sometimes called the run-out deadline. It can fall after the plan-year end, but does not by itself extend the period when care can be received.
For example, a March claims deadline does not necessarily mean you can buy something in February using last year's money. It may only allow submission of receipts for care received during the earlier coverage period.
Job changes, termination and other coverage changes may create different deadlines or continuation options. If you are leaving an employer, ask about your specific situation immediately rather than relying on the ordinary year-end schedule.
How do a carryover and a grace period differ?
A carryover allows a limited amount of unused health FSA money to be used in the next plan year if the plan adopts that option. Federal limits apply, and the employer's rules may allow less. Check which year's limit and which plan provisions apply rather than using a number from an old article.
A grace period allows additional time after the plan year to incur eligible expenses. IRS guidance permits a grace period of up to two months and 15 days; the plan must offer it, and its actual rules control. A health FSA cannot provide both the carryover and grace-period options for the same plan year.
A run-out period is different from both: it is time to submit claims. A plan can have a submission window alongside an applicable carryover or grace period.
None of these terms means your FSA becomes a savings account. Unlike a health savings account, a health FSA generally does not let you keep an unlimited balance indefinitely.
Which purchases can you pay for with a health FSA?
Health FSAs generally reimburse qualifying medical expenses for eligible covered people. Examples can include qualifying prescription costs, copayments, eyeglasses and certain over-the-counter medicines. Health insurance premiums generally are not eligible health FSA reimbursements.
Do not assume every item in a pharmacy qualifies. General wellness products, cosmetic services and items with mixed personal and medical uses can have restrictions or documentation requirements. Some expenses require a letter of medical necessity. Ask the administrator about a specific expense before buying it if you are uncertain.
Keep an itemized receipt showing the provider or seller, date, item or service and amount. If insurance is involved, retain the explanation of benefits as well. Paying with an FSA card does not remove all documentation requirements, and a bank statement alone may not show enough information to substantiate a claim.
You cannot reimburse the same expense twice, including through insurance, an HSA or another reimbursement arrangement. Keep track of which account paid which bill.
Worked example: a $280 balance without panic buying
Consider a hypothetical employee, Maya. Her plan ends December 31, permits a claims run-out period through March 31, and offers neither carryover nor a grace period. These dates and amounts are made up to explain the method, not universal plan rules.
Maya has $280 remaining. She first finds an unreimbursed $80 eligible copayment from earlier in the year. After that reimbursement, $200 remains. She already needs replacement prescription glasses costing $150 and confirms the purchase qualifies under her plan. That leaves $50.
She checks whether any other legitimate, unreimbursed eligible expenses exist. She does not buy a $200 wellness device just to consume the balance. If she has no further eligible expenses within the coverage period, the remaining $50 may be forfeited under her plan.
The March 31 deadline gives her time to submit documentation for eligible expenses incurred by December 31; it does not authorize new January spending against that year's balance. For the next election, she considers reducing contributions to better match predictable costs.
What should you elect during the next open enrollment?
Use predictable eligible spending as a starting point: recurring prescriptions, regular visits and planned dental or vision care. Adjust for employer contributions, changes in coverage and any available carryover. The legal contribution maximum is a ceiling, not a recommendation to elect that amount.
Check whether a general-purpose health FSA could interfere with HSA contribution eligibility, including a spouse's FSA that can reimburse your expenses. Limited-purpose arrangements may work differently. If you are choosing an HSA-eligible plan, confirm compatibility before making elections.
Read our HSA and open-enrollment guide for the separate HSA rules. Do not apply health FSA carryover rules to a dependent-care FSA; that is a different benefit with different requirements.
Common mistakes to avoid
- Confusing the deadline to receive care with the deadline to submit a receipt.
- Assuming all employers allow a carryover or that December 31 is every plan's year-end.
- Buying unnecessary products without checking eligibility.
- Losing receipts after an FSA card transaction.
- Seeking two reimbursements for the same expense.
- Electing a large balance next year without reviewing actual eligible spending.
Your next step: a ten-minute balance review
Open your administrator's portal, note the remaining balance and all applicable dates, find unsubmitted receipts and identify any needed eligible care. Save the rules somewhere you can find them. If anything is unclear, ask the benefits team before a purchase rather than after a claim is rejected.
MoneyPatrol can help you review healthcare spending in supported connected accounts and see how it fits your budget. It does not determine FSA eligibility, submit claims or guarantee that an FSA account can connect. A transaction record is not a replacement for an itemized receipt. You can start free with Essential.
Related reading: how to review a medical bill and the 2026 year-end tax checklist.
Official sources
Your written plan documents decide the available benefit options and deadlines. Check current guidance and consult a qualified benefits or tax professional for your circumstances.
MoneyPatrol is not a financial, tax, investment, legal or accounting advisor. This article is for general educational purposes only and is not a substitute for personalised advice from a qualified professional. See our full disclaimer.
