Can I change my FSA contribution mid-year?

Generally no. Your election is locked in during open enrollment for the plan year, unless you have a qualifying life event like marriage, divorce, birth of a child, or a change in employment status.

What happens to my FSA if I leave my job?

In most cases you lose access to unused FSA funds when your employment ends, unless your plan offers COBRA continuation or you've already incurred eligible expenses before your last day. Spend down your balance before you give notice if you're planning a job change.

Is a dependent care FSA the same as a health FSA?

No. A dependent care FSA covers child care or adult dependent care costs so you can work, while a health FSA covers medical, dental, and vision expenses. They have separate contribution limits and separate elections.

FSAs Explained: The Pre-Tax Benefit Most People Waste Every Year

How Flexible Spending Accounts work in 2026, the contribution limits, the use-it-or-lose-it rule, and how to avoid forfeiting your own money.

If your employer offers a Flexible Spending Account during open enrollment, there's a good chance you either skipped it or guessed at a number and moved on. That's a mistake. An FSA is one of the few benefits that gives you an immediate, guaranteed return: every dollar you put in avoids income and payroll taxes before it ever hits your paycheck. But it comes with a strict deadline most people don't plan around, and that deadline is where the money gets lost.

What an FSA Actually Is

A Flexible Spending Account is an employer-sponsored account you fund through payroll deductions before taxes. You choose an annual amount during open enrollment, and that money comes out of your paycheck in equal installments over the year. You then use it to pay for eligible medical, dental, vision, or dependent care costs.

The tax benefit is straightforward. If you elect $3,000 for the year, that $3,000 never counts as taxable income. Depending on your tax bracket, that can mean hundreds of dollars in tax savings on money you were going to spend on medical costs anyway.

2026 Contribution Limits

The IRS has bumped up the annual contribution limit for health FSAs to $3,400 in 2026, up from $3,300 in 2025. That limit is per employee, per employer, so if both spouses have access to an FSA through separate employers, each can contribute up to that amount.

Dependent care FSAs work differently and got a much bigger jump. Effective January 1, 2026, families can contribute up to $7,500 annually to a Dependent Care FSA, up from the previous $5,000. This increase came from the One, Big, Beautiful Bill Act, which raised the dependent care FSA limit to $7,500 or $3,750 for married couples filing separately, for tax years starting in 2026. Unlike the health FSA limit, which adjusts for inflation, this one was a legislative change, not an annual inflation bump.

The Rule That Trips People Up: Use It or Lose It

This is the part that scares people away from FSAs, and for good reason. Because FSAs operate under a use-it-or-lose-it rule, employees should carefully estimate their eligible health care expenses and only contribute funds they are certain they will spend. Any unspent funds remaining after the grace period, if applicable, or the plan year's end will be forfeited.

That's not a technicality. If you overestimate, that money is gone. It doesn't roll into your paycheck, and it doesn't carry into next year unless your employer's plan specifically allows it.

The Two Safety Nets: Carryover and Grace Period

Employers can soften the use-it-or-lose-it rule in one of two ways, but not both at the same time. Some employers offer a grace period of up to 2.5 months after the plan year ends, allowing employees to incur expenses and use remaining funds, while plans cannot offer both a grace period and a carryover.

If your employer offers a carryover instead, the amount you can roll forward is capped and adjusted each year. For cafeteria plans that permit the carryover of unused amounts, the 2026 maximum carryover amount is $680, an increase of $20 from 2025. That carryover is on top of whatever new amount you elect for the following year, but you'll want to confirm with HR whether your specific plan even offers it, since it's optional for employers.

How to Pick Your Election Amount

The goal is to get as close to your actual spending as possible without going over. A few ways to estimate:

Add up last year's out-of-pocket costs for copays, prescriptions, dental work, and vision care.
Factor in anything predictable coming up: braces, a planned surgery, new glasses, a baby on the way.
If your plan has no carryover or grace period, lean toward underestimating slightly rather than overestimating.
Check your plan's eligible expense list before enrolling, since it usually covers more than people assume, including certain over-the-counter items, sunscreen, and menstrual products.

FSA vs. HSA in One Sentence

They're not interchangeable. An individual generally cannot contribute to both a general-purpose health FSA and an HSA in the same year, though a limited-purpose FSA restricted to dental and vision, or a post-deductible FSA, can be paired with an HSA. HSAs require a high-deductible health plan and let unused money roll over indefinitely and even get invested; FSAs don't require a specific plan type but come with the forfeiture risk described above.

The Bottom Line

An FSA is free tax savings if you use it right and a small, predictable loss if you don't plan it out. The fix isn't complicated: look at last year's actual medical spending, elect close to that number, and know your specific plan's carryover or grace period rules before December hits. If you're not sure how a decision like this fits into your broader financial picture, running your numbers through a tool like Grade My Finance can help you see whether your benefit elections, savings rate, and spending are actually working together instead of against each other.