If you have a flexible spending account through work, there's a decent chance you're sitting on a few hundred dollars that will evaporate if you don't use it.
Most plans run on the calendar year, which means the clock is already ticking toward December 31.
Miss it, and the money goes back to your employer.
Here's the part that trips people up: an FSA is not a bank account.
You funded it with pre-tax dollars pulled from your paycheck, which lowered your taxable income all year.
The trade-off is that the IRS makes you spend it on eligible expenses within a set window.
Unlike an HSA, which rolls over and can even be invested, an FSA is use-it-or-lose-it by design.
Some employers offer a grace period, usually until March 15, or a carryover of a limited amount into next year.
The carryover cap for 2025 sits at $660, and plenty of companies don't offer it at all.
If you're not sure which rules apply to you, your benefits portal or HR contact has the answer in about thirty seconds.
What counts as eligible is broader than most people assume.
Doctor visits, prescriptions, glasses, contacts, dental work, therapy, and medical equipment all qualify.
So do a long list of over-the-counter items if you have a prescription or if your plan uses the newer receipt-based rules.
Bandages, pregnancy tests, blood pressure monitors, and even sunscreen with an SPF of 15 or higher have made the eligible list in recent years.
The deadline crunch is real, and it collides with the most expensive month on the calendar.
December already drains wallets with gifts, travel, and higher heating bills.
Adding a scramble for medical spending on top of that is how people end up buying things they don't need just to avoid forfeiting the balance.
That's a bad trade, since you're still spending real money to save pre-tax money.
A smarter move is to schedule the care you've been putting off.
That dental cleaning you skipped, the eye exam, the dermatologist check, the therapy sessions you meant to book in September.
December appointments fill up fast, so call now rather than the week before the holiday.
If you wear glasses or contacts, this is the moment to use that vision benefit.
You can also stock up on genuinely useful items.
Contact lens solution, first aid supplies, thermometers, and allergy medication won't go bad.
If you have dependents on your plan, their eligible expenses count too, which widens your options considerably.
Buying something that isn't eligible means the claim gets denied, and you're stuck with a receipt and a shrinking calendar.
Your plan's eligible expense list is the final word, not a random blog or a cashier's opinion.
If you do end up with a small leftover balance and no way to spend it, that's a signal for next year.
Estimate your FSA contribution based on actual expected costs, not the maximum your employer allows.
Overfunding an FSA is one of the quietest ways to lose money in personal finance, because nothing about it feels like a loss until the balance disappears.
The takeaway is simple: log into your benefits account today, find your exact deadline and balance, and book whatever care you've been deferring.
A fifteen-minute check now beats watching a few hundred dollars vanish on January 1.
Final Thoughts
Treat the deadline like a bill you actually want to pay.