You cannot change your FSA contribution mid-year unless you have a may have access to life event

FSA contributions are locked in for the plan year, which usually runs January through December. Once you enroll and your payroll deductions begin, you cannot increase or decrease the amount you contribute unless your situation changes in a way the IRS recognizes as a may have access to event. This rule exists because FSAs receive tax-assistance programs — the IRS limits when you can alter that arrangement to prevent people from gaming the system.

If you have no may have access to event, you are stuck with your election until the next open enrollment period, which typically happens in the fall for coverage starting January 1. The only exception is if your employer offers a special mid-year change window, which some do but most do not.

Key Takeaways

  • FSA contribution changes mid-year require a may have access to life event such as marriage, divorce, birth of a child, loss of coverage, or a significant change in childcare costs.
  • You must request the change within 30 to 60 days of the may have access to event, depending on your plan rules — waiting longer usually means you lose the right to change.
  • Your employer's benefits administrator, not the FSA provider, processes mid-year changes and determines whether your event qualifies.
  • Some employers allow changes during a special open enrollment window in the fall, but this is optional and not may provide at your workplace.
  • If you cannot change your contribution and you have unused FSA money at year-end, you forfeit it under the use-it-or-lose-it rule.

What counts as a may have access to life event

The IRS has a specific list of events that allow you to change your FSA contribution. The most common are: marriage, divorce, birth or adoption of a child, death of a spouse or dependent, significant change in childcare costs or provider, loss of health coverage (yours or a family member's), change in your spouse's employment or benefits, and a substantial change in your health care needs.

Less obvious events also may have access to. If your child ages out of daycare and you no longer need dependent care FSA coverage, that is a may have access to event. If your employer changes the FSA plan itself — for example, raising the annual contribution limit — that triggers a change window. If you move to a state with different tax rules, that may may have access to as well, though this varies by plan.

Events that do not may have access to include a simple change of mind, a change in your income, or a change in the cost of medical services. You cannot increase your FSA contribution just because you expect higher medical bills next month, and you cannot decrease it because you had a good year and did not spend much.

The timeline for requesting a change

Once a may have access to event occurs, you typically have 30 to 60 days to notify your employer's benefits administrator and request the change. The exact window depends on your plan — your benefits handbook or summary of benefits and coverage should state the deadline. If you miss this window, your request will be denied and you cannot change your contribution until the next open enrollment.

The clock starts on the date the event happens, not the date you find out about it. If you have a baby on June 15 and do not contact benefits until August 1, you may already be outside the window. Contact your benefits administrator as soon as the event occurs — do not wait to see if you remember later.

How to request a mid-year change

Contact your employer's benefits administrator or human resources department, not the FSA provider directly. Your HR team handles the paperwork and determines whether your event qualifies under your specific plan. They will ask you to document the event — a birth certificate for a new child, a divorce decree, a letter from your childcare provider showing a cost increase, or proof of loss of coverage.

Submit the required documents along with your request. Do this in writing (email is usually fine) so you have a record of when you submitted it. Keep copies of everything you send. Once HR approves the change, they will notify the FSA provider and your payroll department. The new contribution amount typically takes effect in the next pay period after approval, though some plans delay it to the first of the following month.

What happens if you miss the deadline

If you do not request a change within the allowed window, you cannot alter your contribution for the rest of the plan year. You are responsible for the full amount you elected, and if you do not spend it by December 31, you lose it. There is no carryover, no refund, and no exception — this is the use-it-or-lose-it rule that applies to all FSAs.

If you realize mid-year that you elected too much and cannot spend it, your only option is to wait for open enrollment in the fall and reduce your contribution for the following year. Some employers offer a grace period (usually 2.5 months into the new year) to spend money from the previous year, but this is optional and not all plans include it. Check your plan documents to see if yours does.

Special open enrollment windows some employers offer

A small number of employers allow FSA changes during a special mid-year open enrollment window, separate from the may have access to event process. This might happen in the spring or summer and typically lasts one to two weeks. If your employer offers this, it will be announced in advance and you can change your contribution without a may have access to event.

This is not required by law — it is an employer choice. Ask your benefits administrator whether your workplace offers a mid-year change window and when it occurs. If it does, mark the dates on your calendar because the window is usually short and you cannot change outside of it.

Frequently Asked Questions

Can I increase my FSA contribution if I expect higher medical costs?

No, unless the increase in costs is tied to a may have access to event. A diagnosis or planned surgery alone does not may have access to. However, if the diagnosis triggers a change in your health insurance coverage or your dependent care needs, that event may may have access to you to change.

What if my employer changes the FSA plan mid-year?

If your employer modifies the FSA plan itself — such as raising the annual limit, changing the grace period, or altering covered expenses — you usually get a change window to adjust your contribution. Your HR department will notify you of the window and the deadline.

Can I change my contribution if I get married?

Yes, marriage is a may have access to event. You have 30 to 60 days from the wedding date to notify your benefits administrator. You can increase, decrease, or start an FSA contribution based on your new household situation and your spouse's benefits.

What if I lose my job mid-year?

Loss of employment ends your FSA coverage, and you stop making contributions immediately. You have until the end of the plan year to spend the money you already contributed. If you get a new job with FSA coverage, that is a new plan and a new election — your old FSA money does not transfer.

Do I lose my FSA money if I cannot change my contribution?

Yes. If you cannot change your contribution and you do not spend the full amount by December 31, you forfeit the remaining balance. This is why it is important to estimate carefully during open enrollment and to request changes as soon as a may have access to event occurs.