You can change your FSA contribution mid-year only if you have a qualifying life event, the change fits that event, and you submit the request within your plan’s deadline. Most plans give you 30 days from the date of the event. Without a qualifying event, whatever you elected during open enrollment stays fixed until the next plan year.
Why FSAs Are Normally Locked for the Year
The IRS treats FSAs as part of a cafeteria plan under Section 125 of the Internal Revenue Code.1Office of the Law Revision Counsel. 26 USC 125 – Cafeteria Plans The trade for pre-tax funding is an irrevocability rule: your election amount is locked in for the plan year. Realizing you set aside too much, or that your medical spending shifted, is not enough on its own. Federal regulations recognize a specific set of exceptions, and everything else waits for open enrollment.
The rule applies to both health care FSAs and dependent care FSAs. Your employer’s plan does not have to permit every exception the regulations allow, so the practical starting point is your Summary Plan Description.
Qualifying Life Events That Let You Change Your Election
Federal regulations list five categories of change-in-status events that can unlock a mid-year election change:2GovInfo. 26 CFR 1.125-4 – Permitted Election Changes
- Change in legal marital status: marriage, divorce, legal separation, annulment, or death of a spouse.
- Change in number of dependents: birth, adoption, placement for adoption, or death of a dependent.
- Change in employment status affecting benefit eligibility: starting or losing a job, going on or returning from unpaid leave, a strike or lockout, a change in worksite, or a shift between full-time and part-time. This can be your own change, your spouse’s, or a dependent’s.
- Dependent eligibility change: aging out, losing student status, or a similar event. For dependent care FSAs, a child turning 13 no longer qualifies for reimbursable expenses.3Internal Revenue Service. Publication 503 (2025), Child and Dependent Care Expenses
- Change in residence, when it affects access to providers or the plan’s coverage area.
Gaining or losing eligibility for Medicaid or the Children’s Health Insurance Program (CHIP) is treated separately and usually opens a 60-day window rather than the standard 30 days.
Your Change Has to Match the Event
Federal rules require any mid-year change to be “on account of and consistent with” the qualifying event.2GovInfo. 26 CFR 1.125-4 – Permitted Election Changes The direction and size of your adjustment need to make sense given what happened.
A few concrete illustrations:
- Having a baby: you can increase your health care FSA to cover new medical costs and increase your dependent care FSA to cover child care. Decreasing either would generally not be consistent with adding a dependent.
- Getting divorced: if you had been covering a spouse’s expenses, you can decrease your health care FSA.
- Spouse starts a job with benefits and enrolls in that employer’s health plan: you can decrease your health care FSA because your family gained coverage elsewhere.
Your plan administrator reviews the request against this consistency test. A change with no logical connection to the event, such as cutting your dependent care FSA after a birth, will be denied.
Deadlines and How to File the Change
There is no single federal deadline. Each plan sets its own window, and most use 30 days from the event date; some allow 60. Plans must give at least 60 days for Medicaid or CHIP events. Miss the window and you are locked in until the next open enrollment, so confirm the exact deadline in your Summary Plan Description or with HR before anything else.
The typical process:
- Gather documentation of the event: marriage certificate, birth certificate, adoption decree, termination notice, or similar proof.
- Submit a change-of-status form. Most employers use an online benefits portal; some still use paper forms routed to HR or a third-party administrator.
- Wait for approval. The administrator confirms the change is consistent with the event.
- Check your next pay stubs. Payroll recalculates the remaining contributions and spreads the new annual total across the pay periods left in the year.
Mid-year changes take effect going forward only. The new rate typically starts on the first day of the month after approval and continues through the end of the plan year, unless another qualifying event occurs.
How the New Contribution Amount Is Calculated
Your revised annual election still has to fit within the IRS limits for the plan year. For 2026:
- Health care FSA: up to $3,400 per employee in voluntary salary reductions, plus any employer contributions.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
- Dependent care FSA: up to $7,500 per household ($3,750 if married filing separately), increased from $5,000 beginning in 2026. Contributions also cannot exceed your earned income, or your spouse’s if lower.5Internal Revenue Service. 2026 Publication 15-B, Employer’s Tax Guide to Fringe Benefits
The administrator takes your revised annual target, subtracts what you have already contributed, and divides the remainder across the pay periods left in the plan year. If a mid-year increase would push you past the annual limit, your election gets capped at the maximum.
If You Drop Your Health Care FSA and Have an HSA
A general-purpose health care FSA counts as “other health coverage” that disqualifies you from making Health Savings Account contributions.6Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans If your mid-year change involves dropping the FSA so you can start funding an HSA, ask your administrator when the FSA coverage actually ends and from what date HSA eligibility resumes. A limited-purpose FSA, which only covers dental and vision, does not create the same conflict.
Leaving Your Job Is Not the Same as a Mid-Year Election Change
Ending employment does not “change” your election in the normal sense. Your health care FSA stops covering new expenses as of your termination date, and you generally have 60 to 90 days to file claims for expenses incurred while you were still employed. Check your plan for the exact deadline.
One feature worth knowing: the uniform coverage rule makes your full annual health care FSA election available for reimbursement from day one of the plan year, regardless of how much you have contributed. If you elected $3,400, used it all by March, and left in April, your employer cannot claw back the difference.
COBRA continuation of a health care FSA is sometimes offered, but it is funded with after-tax dollars plus a 2% administrative fee and usually lasts only through the end of the plan year. It rarely makes sense unless you have a positive balance you want to spend down.
Dependent care FSAs work differently after separation: the remaining balance stays available to reimburse expenses incurred during your period of employment and enrollment, but no new contributions go in.