You can change FSA contributions only during open enrollment or after a may have access to life event

Your Flexible Spending Account (FSA) contribution is locked in for the plan year once you enroll — you cannot change it on a whim. The IRS treats FSA elections as binding commitments. You get two windows to alter what you contribute: the annual open enrollment period (usually October or November for the following year) and within 30 to 60 days after a may have access to life event, depending on your employer's rules.

If you miss both windows, you are stuck with your election until the plan year ends. This is why FSA planning matters: you commit money before you know exactly what you will spend, and changing course mid-year is difficult. Understanding when the doors open and what counts as a may have access to event can save you from locking in a contribution that does not match your actual needs.

Key Takeaways

  • Open enrollment typically runs in October or November and lets you change your FSA contribution for the following calendar year with no restrictions.
  • may have access to life events — marriage, divorce, birth of a child, loss of coverage, or significant change in dependent care costs — allow mid-year changes within 30 to 60 days of the event.
  • Your employer sets the exact important date for reporting a life event, so check your plan documents or call your benefits administrator when ready when something changes.
  • If you change your contribution after a life event, the new amount takes effect the first of the month following your request or the next pay period, depending on your employer.
  • Unused FSA money does not roll over to the next year; you forfeit it if you do not spend it, so overestimating your contribution costs you real dollars.

What counts as a may have access to life event

The IRS allows FSA changes only for specific reasons, not for any change of mind. The most common may have access to events are birth or adoption of a child, marriage or divorce, death of a spouse or dependent, and loss of health coverage. A change in your dependent care costs — such as your child aging out of daycare or your spouse starting a job — also qualifies in most plans.

Some employers recognize additional events: a significant change in your health insurance coverage, a change in your spouse's FSA election, or a change in your work schedule that affects your dependent care needs. Your employer's plan document lists the exact events they recognize. If you are unsure whether your situation qualifies, contact your benefits administrator or HR department before the important date passes — once the window closes, you cannot go back.

A change in your income or tax situation does not may have access to, nor does a straightforward change of mind about how much you want to set aside. The IRS is strict about this: the rules exist to prevent people from gaming the system by contributing less when they are healthy and more when they expect medical expenses.

How to report a life event and change your contribution

When a may have access to event happens, you typically have 30 to 60 days to notify your employer — check your plan documents for the exact important date. You will usually submit a form through your benefits portal, email it to HR, or call your benefits administrator. Have your event documentation ready: a birth certificate for a new child, a marriage license, a divorce decree, or a letter from your dependent care provider showing a change in costs.

Your employer will then ask you to submit a new FSA election form. You can increase your contribution, decrease it, or stop contributing altogether. The change usually takes effect on the first day of the month following your request or on your next pay period, depending on how your employer processes changes. Some employers explore the change when ready; others wait until the next payroll cycle. Ask your benefits administrator for the exact timing so you know when the new amount will appear in your paychecks.

If you miss the important date, you lose the right to change your election until the next open enrollment period. This is why acting quickly matters: a 30-day window can close before you realize it. Mark the important date on your calendar and submit your paperwork early.

Open enrollment: your annual chance to adjust

Every year, usually in October or November, your employer opens a window for all employees to change their FSA contributions for the following year. This is the easiest time to make changes because you do not need to justify them — you can increase, decrease, or stop your contribution for any reason. Open enrollment typically lasts one to two weeks, though some employers allow changes for a full month.

During open enrollment, you can also switch between different types of FSAs if your employer offers them: a healthcare FSA (for medical, dental, and vision expenses) and a dependent care FSA (for daycare and after-school care). Some employers let you enroll in both. The contribution limits are separate: healthcare FSA contributions are capped at $3,300 per year (for 2024), and dependent care FSA contributions are capped at $5,000 per year for married couples filing jointly or $2,500 for single filers.

If you do not change your election during open enrollment, your contribution carries over to the next year at the same amount. This is called auto-renewal. It is convenient if your situation has not changed, but it means you should review your election every year to make sure it still fits your needs.

What happens if you change your contribution mid-year

When you change your FSA contribution after a may have access to life event, the new amount applies to paychecks going forward — it does not affect money you already contributed. If you increased your contribution, the higher amount comes out of your next paycheck. If you decreased it, the lower amount starts on the next pay period. Your employer will recalculate how much you contribute for the rest of the year so that you reach your new election by December 31.

For example, if you elected $2,000 for the year but had only contributed $500 by June when you had a baby, you could increase your election to $3,000. Your employer would calculate how much you need to contribute for the remaining six months to reach $3,000 by year-end and adjust your paycheck deductions accordingly. If you decrease your contribution, the lower amount takes effect when ready, and you keep whatever you already set aside.

One important rule: you cannot reduce your FSA contribution below what you have already spent or claimed for reimbursement. If you contributed $1,500 and spent $1,200 on medical expenses by June, you cannot drop your election to $1,000 — you can only reduce it to $1,200 or higher. This prevents people from underfunding their account after they have already used the money.

The forfeiture rule and why overestimating costs you

FSA money does not roll over. Anything you do not spend by December 31 is forfeited — you lose it. This is called the use-it-or-lose-it rule, and it is one of the biggest drawbacks of FSAs. If you contribute $2,500 and spend only $2,000, the remaining $500 goes back to your employer. You cannot carry it forward, and you cannot get it refunded.

This is why changing your contribution mid-year matters. If you realize by June that you overestimated your medical expenses, you can reduce your contribution to avoid losing money at year-end. Conversely, if you underestimated and are running out of funds, you can increase your contribution if a may have access to event allows it. Without the ability to adjust, you are gambling on your own spending patterns.

Some employers offer a grace period of up to 2.5 months into the next year to spend money from the previous year's FSA, but this is optional — check your plan documents to see if yours does. A few employers also offer a carryover of up to $610 (for 2024) to the next year, but again, this is not required. Most plans have neither, so assume your money expires on December 31.

Why you cannot change your FSA outside these windows

The IRS restricts FSA changes to prevent tax abuse. FSAs are funded with pre-tax dollars, which means you save money on federal income tax, Social Security tax, and Medicare tax on the amount you contribute. If people could change their contributions whenever they wanted, they could contribute less when they are healthy and more when they expect big medical bills — essentially using the FSA as a tax shelter that adjusts to their needs.

By locking in contributions except during open enrollment and after may have access to events, the IRS ensures that FSA elections are genuine commitments based on expected spending, not strategic tax moves. Your employer enforces this rule because they face penalties if they allow changes outside the permitted windows. This is why even a sympathetic HR representative cannot bend the rules for you — the restriction comes from federal law, not company policy.

Frequently Asked Questions

Can I change my FSA contribution if I lose my job or change jobs?

Loss of health coverage through your employer qualifies as a life event in most plans, so you can change your FSA election within 30 to 60 days. If you move to a new job with a different FSA, you cannot transfer your old FSA balance — you must spend it or lose it by December 31. Your new employer's FSA is a separate account with a separate contribution limit.

What if I have a baby mid-year — can I increase my FSA right away?

Yes, birth of a child is a may have access to event. You typically have 30 to 60 days from the birth to notify your employer and increase your FSA contribution. Submit a copy of the birth certificate to your benefits administrator and request a new election form. The increased contribution will take effect on the next pay period or the first of the following month.

Can I stop contributing to my FSA mid-year if I do not think I will use it?

Only if a may have access to life event occurs. A straightforward change of mind does not allow you to reduce or stop your contribution. If you realize by June that you overestimated your spending, you are stuck unless you experience a may have access to event like a change in dependent care costs or loss of coverage.

What happens to my FSA money if I leave my job before the year ends?

You forfeit any unspent FSA balance when you leave your job. You have until the end of the calendar year to submit claims for expenses you incurred while employed, but you cannot access money after you separate from the company. This is another reason to spend down your FSA before you leave or plan your resignation around the calendar year.

Can I change my FSA contribution if my spouse's job situation changes?

A change in your spouse's health coverage or FSA election may may have access to as a life event, depending on your employer's plan. Some employers recognize this; others do not. Check your plan documents or ask your benefits administrator whether your spouse's job change allows you to adjust your election.