It’s Your Money. On December 31, Your Employer’s Plan May Keep It

Priya chose the number last November in about ninety seconds. Open enrollment was ending that afternoon, the benefits page asked how much she wanted to set aside for a health flexible spending account, and $2,400 sounded reasonable. It was less than she had spent on health care the year before. She clicked confirm and went back to work.

All year it came out of her paycheck in small pieces, so small she stopped noticing. She used the account for an urgent care visit in March, for her daughter’s glasses in June, and for a steady stream of prescriptions. She felt careful and a little smug about the tax savings. Then, in the first week of December, a coworker said something in passing: “I’m spending down my FSA before it disappears.”

Disappears? Priya logged in that night. The balance read $1,050. She had used $1,350 of the $2,400 she had elected, and she had no idea that the rest was on a clock.

She spent the next hour looking for answers and found three terms that seemed to contradict each other. Her plan documents mentioned a “carryover.” A message from the administrator mentioned a “run-out period.” A forum post mentioned a “grace period.” Were they the same thing? Did she have all of them, one of them, none? Nobody had ever explained, and the amount at stake was more than her monthly rent.

Priya is a composite character and the figures are invented for this article. The confusion is real, and it has a clear answer once you know that these three terms describe three different rules.

Carryover, grace period and run-out sound alike. Only one of them gives you more time to spend, and your plan may not offer it.

Why FSA money can expire at all

A health FSA lets you set aside pre-tax pay for eligible medical, dental and vision costs. In exchange for that tax break, IRS rules generally require that money you do not use within the plan year goes back to the employer’s plan, not back to you. People call this the use-it-or-lose-it rule, and it is the reason a balance that looks like savings is actually closer to a coupon with an expiration date.

The IRS allows employers to soften that rule in limited ways. They can offer a carryover, or a grace period, or neither. They cannot offer both on the same health FSA. Which one your employer chose, if any, determines everything else in this article.

Three rules that sound alike

That last distinction is where most people trip. A run-out period saves your receipts. It does not save your balance. If you reach January 1 with $1,000 unspent and your plan has only a run-out period, you can still file for dental work you had in November, but you cannot buy new glasses in January and charge them to the old year.

What happens to Priya’s $1,050

The same balance can end three different ways depending on the plan design. Here is the same $1,050, three times. All figures are hypothetical.

Notice what changes the outcome in each row. In Plan A, nothing Priya does matters beyond the cap. In Plan B, the number depends on what she can sensibly buy before the grace period ends. In Plan C, the only way to avoid a loss is to find eligible expenses from this year that she has not claimed yet, which is why digging out old receipts is the first step in any plan.

Find your own numbers in ten minutes

There is one more reason to settle this early. Plan years are not always the calendar year. If your employer’s plan year runs July to June, or October to September, the deadlines in this article apply on those dates instead, and the carryover limit that applies depends on the year your plan began. A coworker on a different employer’s plan can have a completely different cutoff, so a rule you heard from a friend is a prompt to check, not an answer.

It also helps to know that the FSA debit card does not always tell the whole story. Some purchases are approved automatically at the register, while others trigger a request for an itemized receipt weeks later. Keep your receipts and explanation-of-benefits statements, because an unverified charge can be reversed and the amount deducted from future claims.

Spending what is left, sensibly

The goal is to use the money on things you actually need, not to buy things because a deadline is near. Most of what people use FSA money for falls into a few groups.

Vision and dental work are the usual places people find real value, because the needs are predictable and often postponed. If you are weighing how a vision plan fits alongside an FSA, our comparison of vision discount plans and vision insurance explains the difference, and our piece on low-cost dental care through dental school clinics shows how to stretch a dental budget. If you are heading to an appointment soon, the checklist in what people forget to bring to doctor appointments includes the FSA card.

If you are leaving your job

A health FSA belongs to your employer’s plan, not to you. If you leave, coverage generally ends with your employment unless the account is continued through COBRA, and you can generally only use it for expenses incurred while you were still covered. If a job change is coming, check your balance and use it for eligible care before your last day.

One feature works in your favor. Your full yearly election is generally available from the first day of the plan year, even though the money is deducted from your pay gradually. If you spent more than you had contributed before you left, you generally do not have to pay the difference back. For more on protecting yourself during a job loss, see how to protect yourself from health insurance gaps when laid off.

FSA or HSA: not the same account

The two can conflict. A general-purpose health FSA generally makes you ineligible to contribute to an HSA for the period it covers, and that can include money carried over into a new year. If you are switching to an HSA-compatible plan for 2027, ask HR how a carryover would be handled, or whether a limited-purpose FSA for dental and vision is available. Our guide to opening an HSA with a bronze plan and our explainer on which high-deductible plans qualify for an HSA go deeper on that side.

Choosing next year’s number

Open enrollment is also when you pick your FSA election for the coming year, and Priya’s mistake was the common one: she picked a figure quickly and never revisited it. A calmer approach has four steps.

If you also pay for child or adult care so you can work, a dependent care FSA is a separate account with its own limit, which rose to $7,500 per household for 2026. The health FSA carryover rule does not apply to it, so check that plan’s deadlines separately.

Two assumptions to drop

Priya, in the end, spent an evening on the phone with her administrator. Her plan turned out to have a carryover. She used part of the balance on a dental visit she had delayed, let $680 roll forward, and lost far less than she had feared. The bigger change was in her habits. This year, she checked her balance in June.

If your plan sits alongside an employer-funded benefit, you may also want to read how a health reimbursement arrangement differs, since the two are easy to confuse and follow different rules.