Short answer: No. A change in expenses alone does not allow a mid-year FSA change; you must experience a qualifying life event and your employer’s plan must permit the change.
Under Section 125 rules, Flexible Spending Account (FSA) elections are generally locked in for the full plan year. Simply realizing that your medical or dependent care expenses will be higher or lower than expected does not allow you to change your election.
Mid-year FSA changes are permitted only if you experience a qualifying life event that is recognized under federal rules and the change is consistent with that event. Common qualifying events include changes in marital status, changes in the number of dependents due to birth, adoption, or death, certain changes in employment status for you or your spouse, or a dependent gaining or losing eligibility.
Even when a qualifying life event occurs, employers are not required to allow mid-year FSA changes unless their cafeteria plan document specifically permits them. Plans that do allow changes typically require employees to request the change within a limited time window, often 30 days from the event.
Because FSA elections are subject to the Irrevocable Election Rule, employees should carefully estimate expected expenses during open enrollment. Mid-year changes are the exception, not the rule, and are governed by both federal requirements and the employer’s plan design.
FSA election rules are administered under guidance issued by the Internal Revenue Service.
Sources
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Internal Revenue Service, FAQs for Government Entities Regarding Cafeteria Plans
https://www.irs.gov/government-entities/federal-state-local-governments/faqs-for-government-entities-regarding-cafeteria-plans -
Internal Revenue Code, Section 125
Content history
Originally published: March 25, 2025
Last reviewed: January 25, 2026