💰 Finance & Tax

FSA Deadlines: Use It or Lose It (and How HSAs Differ)

Updated July 21, 2026

A flexible spending account (FSA) is one of the best tax breaks in an employer benefits package, and also one of the easiest ways to lose your own money. FSA funds are generally use-it-or-lose-it: whatever you have not spent by the plan deadline can be forfeited back to your employer.

Health savings accounts (HSAs) look similar on the surface but play by completely different rules. This guide covers the FSA deadlines that actually matter, the grace periods and carryovers that soften them, and why an HSA never expires on you.

The FSA Use-It-or-Lose-It Rule

When you fund an FSA through payroll deductions, you are committing pre-tax dollars to be spent on eligible medical expenses within the plan year. If the plan year ends and money is still sitting in the account, the default outcome is forfeiture. That is not a scare tactic; unspent FSA dollars genuinely disappear.

Most FSA plan years follow the calendar year and end December 31, but not all do. Your plan year, your spending deadline, and your claim submission deadline can be three different dates, and all three are set by your plan documents, not by any universal rule.

FSA funds are generally forfeited if unspent at plan year end
Many plan years end December 31, but yours may differ
The deadline to submit claims often runs later than the deadline to incur expenses

Grace Periods and Carryovers: The Two Softeners

Employers can soften use-it-or-lose-it in one of two ways, but they are not required to offer either, and they generally cannot offer both. A grace period gives you a short window after the plan year ends, commonly around two and a half months, to keep incurring eligible expenses against last year’s balance.

A carryover instead lets you roll a limited amount of unspent funds into the next plan year, with the maximum set by IRS rules and adjusted over time. Anything above the carryover limit is still forfeited. The only way to know which softener your plan offers, if any, is to ask your FSA administrator or read the plan summary. Do this in the fall, not on December 30.

HSAs Are Different: Your Money Rolls Over Forever

A health savings account has no spending deadline at all. HSA funds roll over year after year indefinitely, the account belongs to you rather than your employer, and it follows you when you change jobs. Many HSAs even let you invest the balance, turning it into a long-term, triple-tax-advantaged savings vehicle.

The catch is eligibility: you can only contribute to an HSA while covered by a qualifying high-deductible health plan, and annual contribution limits are set by the IRS. The deadline that matters for HSAs is the contribution deadline, which generally aligns with the tax filing deadline in April for the prior year, not a spending deadline.

A Year-End FSA Spending Plan That Actually Works

The classic FSA failure mode is remembering the balance in the last week of December, when appointment slots are gone and shipping cutoffs have passed. The fix is to check your balance in early fall, while there is still time to schedule dental work, eye exams, or stock up on eligible items.

Set an annual reminder in October or early November to review your FSA balance and book any remaining appointments, plus note your plan’s claim submission deadline so receipts get filed on time. While you are at it, use open enrollment to right-size next year’s contribution based on what you actually spent this year.

Frequently asked questions

Do FSA funds expire at the end of the year?

Generally yes. FSA funds are use-it-or-lose-it at the end of the plan year, unless your employer offers a grace period or a limited carryover. Both are optional plan features, so check with your FSA administrator.

What is the difference between an FSA and an HSA?

An FSA is employer-owned with a spending deadline and possible forfeiture of unused funds. An HSA is yours permanently: funds roll over indefinitely, the account moves with you between jobs, and eligibility requires a qualifying high-deductible health plan.

What is an FSA grace period?

A grace period is an optional plan feature that extends the time to incur eligible expenses shortly after the plan year ends, commonly around two and a half months. Not all plans offer one, and plans that offer a carryover generally cannot also offer a grace period.

Can I still submit FSA claims after the plan year ends?

Usually yes, for expenses incurred during the plan year. Most plans have a claims run-out period after year end for submitting receipts, but the exact deadline is set by your plan, so confirm it with your administrator.

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