FSA Use-It-or-Lose-It Rule: Deadlines, Grace Periods, and Rollovers

The FSA use-it-or-lose-it rule means unspent funds in a healthcare flexible spending account are forfeited at year-end—with two exceptions: most employers now offer a 2.5-month grace period to spend down the balance, and some allow a $640 rollover to the next plan year. Understanding these deadlines and how to strategically spend prevents leaving money on the table.

Why the use-it-or-lose-it rule exists

The use-it-or-lose-it rule is a federal requirement tied to the tax benefit of FSAs. Because contributions are made with pre-tax dollars—lowering your taxable income and tax bracket—the IRS prohibits FSA balances from rolling over indefinitely. The rule prevents people from “banking” five years of unused medical expenses and claiming a massive deduction in a later year when income is lower.

The forfeiture is strict: money not spent by the deadline is gone. It goes back to the employer (or in some cases is split between employer and insurer), not refunded to you.

The standard deadline: December 31

For a calendar-year FSA (the most common), the deadline is December 31. Any money in the account on that date that hasn’t been claimed for medical expenses is forfeited. If your plan operates on a fiscal year (April–March, for example), the deadline moves accordingly.

The deadline applies to claims submitted, not expenses incurred. You can incur a medical expense in November, wait until January to submit the claim and pay from the FSA, and still be within the window. But if you incur an expense in November and don’t submit the claim until February, it’s likely too late.

The 2.5-month grace period

To provide breathing room, the IRS allows employers to voluntarily extend the deadline by up to 2.5 months into the following year. If your plan offers this grace period, you have until March 15 (or later, if your plan sets a custom date within the 2.5-month window) to spend down the balance from the prior year.

Approximately 90% of employers now offer the grace period, making it nearly standard. Check your plan summary or benefits website to confirm your plan’s grace period end date.

The grace period is not a rollover. It’s extra time to spend money from the same plan year. Once the grace period ends, any remaining balance is forfeited—unless your plan also offers the optional rollover.

The $640 rollover provision

A newer option (introduced in 2013) allows employers to let employees carry over up to $640 of unspent FSA balance into the next plan year. This is separate from the grace period and is optional for employers.

Key details:

• $640 limit. Only $640 can roll over; anything above that is forfeited.
• Plan-level choice. Not all employers offer this. It must be written into the plan document.
• Rare alongside grace period. Most plans offer either the grace period or the rollover, not both. Having both would allow you to spend the prior year’s funds during the grace period and still roll over $640, which many plans view as too permissive.
• Combining grace and rollover. Some plans do allow both. In that case, you spend money during the grace period, and if the prior year’s balance still exceeds $640, you can roll over $640 and lose the rest.

Strategic spending before the deadline

To avoid forfeiture, estimate your healthcare costs and monitor your balance:

Predictable expenses:

• Prescription refills (fill early if expiring)
• Dental cleanings and checkups (schedule before deadline)
• Vision exams and glasses (order new frames even if you don’t urgently need them)
• Copays and deductibles (schedule routine procedures)

FSA-eligible expenses (full IRS list is extensive):

• Over-the-counter medications (aspirin, cold medicine, allergy pills—post-2020, these no longer require a prescription)
• Dental work (cleanings, fillings, orthodontia, crowns)
• Vision care (exams, glasses, contacts, solutions)
• Medical equipment (crutches, blood glucose monitors, hearing aids)
• Therapy and mental health (copays and deductibles, if covered under your health plan)
• Dependent care (if you have a dependent care FSA, separate rules apply)

What doesn’t qualify:

• Health insurance premiums (usually)
• Cosmetic procedures (unless medically necessary)
• Vitamins and supplements (unless prescribed)
• General wellness products (gym memberships, fitness trackers)

Strategy for large balances: If you’re carrying $2,000 or more going into December, schedule a dental cleaning, buy six months of contact lens solution, fill routine prescriptions early, and confirm you have adequate over-the-counter pain relievers and allergy medications on hand.

Timing of claims and reimbursements

A common point of confusion: when you incur an expense versus when you claim it.

• Incurred: The date you receive the service or purchase the item.
• Claimed: The date you submit a receipt or receipt form to the FSA administrator for reimbursement.

You can incur an expense in the plan year and claim it during the grace period. So if your plan’s grace period ends March 15, you can have dental work done on December 20 of the prior year, submit the claim on January 10, and still be within the window.

But if the claim is submitted after the grace period or rollover deadline, it will typically be rejected. Keep receipts organized and submit them promptly to avoid missing the deadline.

Managing balances across jobs

If you change jobs mid-year, FSA accounts are not portable. You lose access to your prior employer’s FSA, and any remaining balance may be forfeited.

To minimize loss:

• Spend down your balance before leaving.
• If you’re laid off or resigned mid-year, check whether your plan allows COBRA continuation (uncommon for FSAs, but possible). This lets you extend the plan and claim expenses during the extension period.
• In your new role, enroll in a new FSA if available, but start with a conservative estimate until you understand your new healthcare usage.

Dependent care FSA and the separate rule

Dependent care FSAs (used for childcare or adult care) have the same use-it-or-lose-it deadline and grace period. However, unlike healthcare FSAs, the IRS has been stricter about dependent care rollover provisions, and fewer employers offer the $640 rollover for dependent care accounts. Verify your plan’s rules if you use dependent care.

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