Can You Change Your FSA Contribution at Any Time?

You can change your FSA contribution mid-year only if you have a qualifying life event that both the IRS recognizes and your employer’s plan allows, and you submit the request within your plan’s deadline. Outside of those windows, the amount you elected during open enrollment is locked in for the full plan year. A change of mind, a tighter budget, or a realization that you overestimated your expenses are not, on their own, reasons the IRS accepts.

Why Your Election Is Locked for the Year

FSAs sit inside a cafeteria plan governed by Internal Revenue Code Section 125.¹ The rules on mid-year changes live in Treasury Regulation 1.125-4, which says a plan may let an employee revoke an election and make a new one during the coverage period, but only for specific reasons the regulation lists.²

That “may” is the key word. The IRS permits these changes; it does not require your employer to offer them. So two things have to line up before your contribution can move. The event has to be one the regulation recognizes, and your employer’s written plan document has to allow election changes for that type of event. If either piece is missing, your election holds.

Events That Let You Change a Health Care FSA

Treasury Regulation 1.125-4 groups the permitted “change in status” events into a handful of categories:²

A change in marital status: marriage, divorce, legal separation, annulment, or the death of a spouse.
A change in the number of dependents: birth, adoption, placement for adoption, or the death of a dependent.
A change in employment status for you, your spouse, or a dependent: starting or leaving a job, switching between part-time and full-time, going on or returning from unpaid leave, beginning or ending a strike or lockout, or changing worksites.
A dependent losing eligibility: aging out, losing student status, or otherwise no longer qualifying.
A move by you, your spouse, or a dependent that affects available coverage options.

The regulation also lets you change when you, your spouse, or a dependent gain or lose eligibility for Medicare or Medicaid, and when a court issues a medical child support order requiring you to cover a child.

Extra Triggers for Dependent Care FSAs

Dependent Care FSAs recognize the same life events, plus several tied to how care actually works day to day:

A significant change in the cost of care, such as a rate increase or a change in the hours your child attends. This does not count if your provider is a relative.
Switching to a different childcare provider.
Your child turning 13, at which point they no longer qualify as an eligible dependent for Dependent Care FSA purposes.³
A change in your spouse’s employment status. Dependent Care FSA eligibility generally requires both spouses to be working, so a spouse who stops working can make you ineligible unless that spouse is a full-time student or unable to provide self-care.

The Change Has to Match the Event

The IRS applies a consistency rule: the adjustment you make has to correspond to what actually happened.² Having a baby and raising your Health Care FSA to cover expected pediatric costs is consistent. Divorcing and cutting your election because your former spouse used most of the funds is consistent. Using a qualifying event as cover for an unrelated financial adjustment is not, and a plan administrator can reject the request on that basis.

Fixing a Genuine Enrollment Mistake

A mid-year correction is also possible when your original election came from a clerical, arithmetic, or data-entry error. Typing $250 per month instead of $25, or HR keying the wrong plan, are the kinds of mistakes that can be fixed retroactively when there is clear and convincing evidence a real error occurred. Plans usually apply either an “impossibility” test, asking whether the mistaken election could have been what the employee intended, or a broader facts-and-circumstances review. Regret about the tax math, such as realizing later that the dependent care tax credit would have saved more than the FSA, does not qualify.

How to Actually Request the Change

Move fast. Most employer plans give you 30 days from the qualifying event to notify HR and submit a change request. A longer 60-day window applies when the trigger is gaining or losing eligibility under Medicaid or a state Children’s Health Insurance Program (CHIP).⁴ Miss the deadline and you are almost always stuck with your original election for the rest of the plan year.

Expect to prove the event happened. Common documentation includes:

A marriage certificate or divorce decree.
A birth certificate or adoption paperwork.
A letter from an employer confirming the start or end of coverage.
A notice showing the date other coverage terminated.

Along with the documents, you will usually complete an enrollment amendment form listing your new contribution amount and the date of the event. The new deduction is not retroactive. It typically starts on a future date, often the first of the month after HR approves the change. Check your next pay stub or a digital confirmation to be sure the adjustment went through.

Watch the Cap and the Forfeiture Risk

A mid-year increase still cannot push you over the annual limit. For 2026, the Health Care FSA cap is $3,400, and the Dependent Care FSA cap is $7,500 per household, or $3,750 if you are married filing separately.⁵⁶ Some employers set lower internal caps, and highly compensated employees may face further limits under Section 125 nondiscrimination testing.¹

FSAs run on a use-it-or-lose-it rule. Money left in the account at the end of the plan year is generally forfeited, so raising your contribution and then failing to spend the extra funds costs you real dollars. Employers can offer one of two softeners, but not both: a carryover of up to $680 of unused Health Care FSA funds into the next plan year (2026 limit), or a grace period of two and a half extra months to incur eligible expenses.⁷⁸ Your plan may offer either one or neither, and Dependent Care FSAs have no carryover option.

What Happens If You Leave Your Job

Leaving mid-year is not a way to reduce your election so much as a hard stop on the account. A Health Care FSA generally ends on your last day of employment. Claims for expenses you incurred before that date can still be submitted, usually during a run-out period of around 90 days, but expenses after your termination date are not covered.⁹

Dependent Care FSAs behave differently. Any balance you have when you leave can keep paying for eligible dependent care expenses until the money runs out or the plan year ends, whichever comes first.⁹ Health Care FSA participants can sometimes continue coverage through COBRA on an after-tax basis, though it usually only makes sense if you have already spent more than you contributed and want to preserve access to the remaining balance.¹⁰

1
Office of the Law Revision Counsel. 26 USC 125 – Cafeteria Plans
2
eCFR. 26 CFR 1.125-4 – Permitted Election Changes
3
Internal Revenue Service. Publication 503 – Child and Dependent Care Expenses
4
U.S. Department of Labor. FAQs on HIPAA Portability and Nondiscrimination Requirements for Workers
5
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
6
FSAFEDS. New 2026 Maximum Limit Updates
7
Internal Revenue Service. Eligible Employees Can Use Tax-Free Dollars for Medical Expenses
8
FSAFEDS. What Is the Use or Lose Rule?
9
FSAFEDS. FAQs
10
U.S. Department of Labor. COBRA Continuation Coverage