Millions of American workers are about to forfeit money they already earned, and most of them won't notice until it's gone.
The culprit is the flexible spending account deadline, a use-it-or-lose-it rule that turns unspent healthcare dollars back over to your employer once the plan year ends.
If you set aside money in an FSA this year, that balance doesn't roll over like a 401(k).
Miss the cutoff, and the cash simply vanishes.
For households that tucked away the maximum—$3,200 in 2025—that can mean losing hundreds of dollars that could have covered glasses, prescriptions, or a dental cleaning.
The rules vary by employer, which is exactly why so many people get caught off guard.
Some plans offer a grace period of up to two and a half months into the new year.
Others allow a carryover of up to $660 to the next plan year.
The only way to know which camp you're in is to read your plan documents or call your HR department directly.
Your benefits portal usually lists the exact deadline and any rollover terms.
Don't assume last year's rules still apply—employers change them more often than you'd think.
There's a long list of eligible expenses people forget they can claim.
Bandages, contact lens solution, sunscreen with SPF 15 or higher, and even some over-the-counter medications qualify.
Acupuncture, chiropractic visits, and mental health counseling typically count too.
If you've been putting off a new pair of prescription sunglasses, now is the moment.
One of the easiest ways to burn a balance fast is to stock up on everyday items at a store with an FSA-eligible section.
Many pharmacies label qualifying products right on the shelf or online, so you can filter and check out in minutes.
Claims usually must be submitted shortly after the expense is incurred, and reimbursement paperwork can take weeks to process.
If you wait until the final days of December to schedule a appointment, you may not get the receipt in time to file.
A few practical moves can rescue a shrinking balance.
Book that overdue eye exam or dental visit now, refill recurring prescriptions before the year closes, and dig through receipts from the past several months—you may have already paid for something you can still claim.
If your plan allows a carryover, confirm the exact cap before you spend down to zero.
And if you're nowhere near using the money, ask HR whether you can adjust next year's election so you're not overcommitting again.
The bigger takeaway is that an FSA only pays off if you actually use it.
Workers who underestimate their medical spending end up subsidizing the plan, while the savviest users treat the deadline like a bill that must be paid.
Our take: an FSA is a genuine tax break, but it rewards planners and punishes procrastinators.
Final Thoughts
Set a calendar reminder for early December every year, and treat that balance like cash in your pocket—because that's exactly what it is until the clock runs out.