Roughly 35 million Americans set money aside in a flexible spending account this year, and a big chunk of them are about to forfeit whatever is left.
The rules are simple and unforgiving: use it by December 31, or watch it vanish.
Here is the part most people learn too late.
Unlike a 401(k) or an HSA, an FSA is a use-it-or-lose-it account.
It is not a scam exactly, since the terms are disclosed up front, but it is a deal structured in the house's favor.
The average worker contributes somewhere between $1,500 and $2,000 a year, according to benefits industry surveys.
A leftover balance of even $300 or $400 is real grocery money, a car payment, or a chunk of a heating bill.
Multiply that across millions of accounts and you start to see why employers are not exactly scrambling to hand it back.
Many plans offer a grace period through March 15, or a carryover of up to $640 in 2025, but not both, and not automatically.
You have to check your specific plan documents.
Assuming your employer offers the friendlier option is how people end up surprised in January.
So what can you actually spend it on before the clock runs out?
Over-the-counter medications, bandages, menstrual products, sunscreen with SPF 15 or higher, glasses, contact lenses, and even some compression socks qualify.
A doctor's note can unlock far more, including some exercise and wellness expenses.
If you are staring down a balance with days to go, the smart move is a bulk run, not a panic run.
Order prescription glasses now, even if the frames arrive in January, as long as you pay before the deadline.
Sites like the FSA Store exist specifically to sell eligible items, which tells you something about how much money gets stranded every year.
It is a business built on the gap between what people set aside and what they remember to spend.
One genuine caution: do not buy stuff you will never use just to zero out the account.
Spending $200 to save $60 in taxes is not a win.
If you are truly stuck, some employers let you roll funds into an HSA if you have one, but that is rare and plan-specific.
The bigger lesson is for next year's enrollment.
If you usually leave money on the table, cut your contribution.
The tax savings on an FSA are real, but they only pay off when the money actually gets spent.
The deadline is not a crisis for everyone, but it is a quiet transfer of wealth from workers to employers, and it repeats every single year.
Check your balance today, not on December 30.
Final Thoughts
The people who benefit most from your forgetfulness are counting on you to wait.