If you set aside money in a flexible spending account this year, there's a decent chance you're about to hand some of it back to your employer.
Unlike a savings account, an FSA comes with a deadline, and whatever you don't spend by the cutoff can vanish.
The average FSA contribution runs somewhere north of $1,500 a year, and surveys consistently find that a meaningful slice of account holders forfeit at least some balance.
Even a few hundred dollars left on the table is real money — roughly a week of groceries for a family of four, or a tank and a half of gas.
The rules depend on your plan, and this is where people get burned.
Some employers offer a grace period of up to 2.5 months into the next year.
Others allow you to carry over a limited amount — for 2024 into 2025, the IRS caps that at $640.
You have to read your own benefits paperwork or call HR, because nobody is going to remind you loudly enough.
What counts as an eligible expense is broader than most people assume.
Prescription glasses and contacts, dental work, therapy, bandages, sunscreen, menstrual products, and certain over-the-counter medicines all typically qualify.
You generally can't use FSA funds for insurance premiums, and cosmetic procedures are out.
If you're unsure, check the IRS list or your plan's eligible-expense tool before you swipe the card.
The practical move is to stop treating this like a scavenger hunt in the final week of December.
Pull your balance now, list what you or your family actually needs, and schedule appointments while slots still exist.
Eye exams and dental cleanings book up fast in December, and a December 31 receipt with a January purchase date can create a reimbursement headache.
One more thing worth questioning: the "use it or lose it" structure isn't a law of nature.
It's a policy choice that shifts unspent money back to employers.
Some companies do the right thing and offer rollovers or grace periods; others quietly pocket the difference.
It's worth knowing which kind you work for — and worth asking about it the next time open enrollment comes around.
Also watch the fine print on dependent care FSAs, which follow separate rules and often have a different deadline than your medical account.
And if you switched jobs mid-year, your old account may have its own cutoff that has nothing to do with your new one.
If you're staring down a balance you can't realistically spend, some plans let you submit expenses incurred before the deadline even if you file the paperwork later — but confirm that with your administrator, not a coworker's recollection.
None of this is complicated, but it is easy to ignore until it's too late.
A 20-minute review of your balance and your calendar could easily save you several hundred dollars.
That's a better return than most things you'll do with your money this month.
The honest take: FSAs reward people who plan ahead and quietly punish everyone else.
If your employer offers a carryover or grace period, use it as a buffer, not an excuse to procrastinate.
Final Thoughts
Set a calendar reminder for November next year, and you'll never donate your own money back to the payroll department again.