When Does Your FSA Actually Expire? Grace Periods, Carryover, and the Gym-Membership Play (2026)

Adam Z. Kawalek, MD

August 25, 2026 · 6 min read

Americans forfeit billions in FSA dollars every year, and most of it dies quietly on December 31. But FSAs don't all expire the same way — there are three designs, and which one you have decides whether your real deadline is New Year's Eve, mid-March, or effectively never for part of the balance. Here is how to find out, and what to do with money that is about to vanish.

The three expiration designs

Use-it-or-lose-it (the default): whatever is left at the end of the plan year is forfeited to your employer. For calendar-year plans, that is December 31.

Grace period: some employers add up to 2.5 extra months — typically through March 15 — during which you can still SPEND last year's balance on new expenses.

Carryover: other employers instead let you roll a capped amount (a few hundred dollars, indexed yearly) into the next plan year. The rest above the cap still dies. Employers can offer a grace period or carryover, not both.

How to find YOUR deadline in two minutes

• Log into your FSA administrator's portal and look for "plan year end," "grace period," or "carryover" on the account summary
• Check whether there is also a claims run-out date — a separate deadline for SUBMITTING claims for expenses you already incurred
• If the portal is unclear, your benefits or HR team knows the plan design cold

The distinction that trips people: a grace period extends when you can incur expenses; a run-out period only extends when you can file them. Money spent after the plan year without a grace period is not reimbursable no matter when you file.

The gym-membership play for a doomed balance

If you have a qualifying diagnosed condition — obesity, high blood pressure, prediabetes or type-2 diabetes, high cholesterol, osteoarthritis, chronic back pain, depression, anxiety — a physician can document that structured exercise treats it in a Letter of Medical Necessity. That letter makes gym membership fees an eligible expense, which means a balance that was about to be forfeited can pay for months of something you would have bought anyway.

Two timing rules make or break this. First, the letter must come before the expense — plans reimburse from the letter's date forward. Second, the expense must land inside your plan year or grace period. So the December sequence is: letter first (same-day is possible), then pay for the membership period, then file with the letter and the itemized receipt. Our year-end guide walks the December version step by step.

What does not work

• Backdating: claiming January-through-November gym fees with a December letter. Reimbursement runs forward from the letter, not backward
• Prepaying far beyond the plan year: most administrators reimburse coverage periods, not multi-year prepayments
• General wellness framing: without a diagnosed condition, no letter makes a gym membership eligible — and the IRS warned about services that pretend otherwise

Adam Z. Kawalek, MD

Board-Certified Physician · Founder, MedSlip · Cedars-Sinai · Johns Hopkins

Dr. Kawalek is a board-certified internal medicine physician with 15+ years of clinical experience. He founded MedSlip to give patients fast, affordable access to the Letters of Medical Necessity that make fitness and wellness spending HSA/FSA-eligible.