Under an IRS Section 125 cafeteria plan, the elections you make at open enrollment are locked in for the plan year unless a specific qualifying event lets you change them. The permitted election changes are set out in Treasury Regulation 1.125-4 and cover situations like marriage, divorce, a new child, a job change, a loss of other coverage, or a significant shift in the cost of a benefit. Even when the IRS would allow the change, three things all have to be true: the event has to fit one of the listed categories, your employer’s plan document has to permit changes for that type of event, and the change you request has to be consistent with the event that triggered it.
The Three Conditions for Any Mid-Year Change
The default rule is irrevocability. Once you elect pre-tax benefits during open enrollment, you generally cannot change them until the next plan year. That rule exists so employees cannot fund benefits only when they know they will use them.
The IRS recognizes exceptions, but a plan is not required to offer any of them. If your plan does allow mid-year changes, all three of these must line up:
- A qualifying event listed in Treasury Regulation 1.125-4 has occurred.
- Your plan document explicitly permits changes for that type of event.
- The change you request is consistent with the event.
The consistency piece is where most requests fail. Getting married lets you add your new spouse to health coverage. It does not let you double your health FSA or drop your dependent care election, because those benefits have nothing to do with a spouse joining your plan. Each benefit in your cafeteria plan is evaluated separately against the event.
Health coverage carries an extra restriction. When the event is a divorce, the death of a dependent, or a dependent losing eligibility, you can only cancel coverage for that specific person. You cannot use the event to rework your whole benefits package.
Life Events That Qualify
Marriage, Divorce, Legal Separation, or Annulment
A change in your legal marital status is a qualifying event. Marriage typically lets you add your new spouse to health coverage and adjust related elections. Divorce or legal separation lets you drop the former spouse from coverage and reduce your contribution accordingly.
Birth, Adoption, or Death of a Dependent
The birth of a child, an adoption, or a placement for adoption lets you add the child to your health plan and increase your dependent care or health FSA election. The death of a spouse or dependent lets you remove that person from coverage and reduce your contribution.
Employment Status Changes
A change in employment status that affects eligibility for coverage qualifies. This covers starting or leaving a job, a strike or lockout, a return from unpaid leave, and shifts between part-time and full-time that trigger new eligibility. The change can be to your employment or your spouse’s or dependent’s. What matters is that the employment change actually affects benefit eligibility under some plan.
A Dependent Losing Eligibility
When a dependent ages out or otherwise stops meeting the plan’s eligibility rules, you can remove the dependent and reduce your pre-tax election.
A Change in Residence
Moving qualifies when the move affects the benefits available to you. The clearest example is an HMO with a defined service area: if you move out of the network, you may switch to another plan option or drop coverage.
Cost and Coverage Events
Significant Cost Changes
If the cost of a benefit rises or drops significantly during the plan year, your plan may let you adjust the corresponding election. A mid-year premium hike could let you switch to a cheaper option or drop coverage. For dependent care, a significant change in what your provider charges can qualify. The regulation does not define “significant” with a specific number; the plan makes that call on the facts.
Significant Curtailment or Loss of Coverage
If an option is eliminated or benefits are substantially cut mid-year, that qualifies. You can move to a remaining option or, in some cases, drop coverage entirely. A provider network shrinking to the point it no longer serves you can also count.
Gaining or Losing Coverage Under Another Plan
This is one of the most common triggers. If your spouse enrolls in a new employer plan, you can drop your spouse from your coverage. If your spouse loses their employer coverage, you can add them to yours. The person actually has to gain or lose the other coverage for the change to be valid.
Marketplace Enrollment
IRS Notice 2014-55 added two situations where you can revoke your employer health plan election mid-year to enroll in a Marketplace plan. The first is when your hours drop below 30 per week but you technically remain eligible under the employer plan. The second is when you intend to enroll in other minimum essential coverage, including a Marketplace qualified health plan. Both revocations must be prospective, and neither applies to a health FSA.
Court-Ordered Coverage
A court judgment or decree requiring health coverage for your child is a qualifying event, most often through a Qualified Medical Child Support Order. You can add the child mid-year. If the order requires someone else to cover the child, you may be able to drop that coverage from your own plan.
HIPAA and CHIPRA Special Enrollment Rights
Federal law layers special enrollment rights on top of the cafeteria plan rules, and your plan must let you make a matching salary reduction change to pay for the new coverage.
For marriage, birth, adoption, or placement for adoption, you have 30 days from the event to request enrollment. For birth or adoption, coverage can be made retroactive to the date of birth or placement, which is an exception to the general rule that cafeteria plan changes only work going forward.
A separate 60-day window applies if you or a dependent lose Medicaid or state CHIP coverage, or if you become eligible for premium assistance under one of those programs. These longer windows come from the Children’s Health Insurance Program Reauthorization Act and override shorter plan deadlines.
FMLA Leave
Taking unpaid leave under the Family and Medical Leave Act has its own rules. Your employer must either let you revoke health coverage during the unpaid leave or keep coverage in place while letting you stop paying your share of the premiums. When you return, you have the right to be reinstated in the same coverage on the same terms, whether or not your coverage lapsed during leave.
While on FMLA leave, you keep the same rights as active employees to make election changes based on qualifying events. If a change-in-status or cost event happens during your leave, you can request the same mid-year change any working employee could.
HSA Contributions Are Different
Health Savings Account contributions made through salary reduction technically sit inside the same irrevocability framework, but most cafeteria plans let you change your HSA contribution amount on a prospective, per-pay-period basis without a qualifying event. IRS proposed regulations have long supported this approach, and it has become the standard plan design.
For 2026, HSA contribution limits are $4,400 for self-only coverage and $8,750 for family coverage. Under the One, Big, Beautiful Bill Act, HSA eligibility also expanded so that people enrolled in bronze or catastrophic Marketplace plans can contribute even if their plan does not meet the traditional high-deductible health plan definition.
Deadlines and Documentation
Once a qualifying event occurs, you typically have 30 days to notify your plan administrator and request the change. That is the standard window most plans adopt, though the regulation itself defers to the plan document on timing. HIPAA events carry their own deadlines: 30 days for marriage, birth, and adoption, and 60 days for loss of Medicaid or CHIP.
Miss the deadline and you are usually stuck with your current elections until the next open enrollment. Employers generally cannot make an exception without putting the plan’s tax-qualified status at risk.
Expect to prove both the event and its date. A marriage certificate, birth certificate, or court order is standard. For a loss of other coverage, a letter confirming the end date typically works.
All salary reduction changes have to be prospective. They apply to future paychecks only and cannot reach back to salary you have already received. The one exception is birth or adoption of a child, where the coverage itself can be effective retroactively to the date of the event even though the salary reduction starts going forward.
The 2026 Contribution Caps That Limit Any Increase
Any increase you request after a qualifying event still cannot push you past the annual maximum for that benefit:
- Health FSA: $3,400 for 2026, up from $3,300 in 2025.
- Dependent care account: $7,500 for single filers and married couples filing jointly, $3,750 for married individuals filing separately. This is the first increase in decades, enacted under the One, Big, Beautiful Bill Act.
- HSA: $4,400 self-only, $8,750 family.
If you have already contributed $2,000 to your health FSA before a qualifying event and then increase your election, everything you contribute the rest of the year plus that $2,000 has to stay within the $3,400 cap.
What Happens If a Plan Ignores the Rules
The consequences of getting this wrong fall mostly on the employer, but employees pay too. If the IRS determines that a plan allowed an unauthorized mid-year change, the plan can be disqualified. Pre-tax treatment of benefits is then retroactively lost, and amounts employees thought were excluded from income get reclassified as taxable wages. That means back taxes, potentially for every participant, not just the person whose change was improper.
Disqualification can also cause problems under ERISA reporting rules and COBRA obligations. Plans that accept mid-year changes without verifying the event, checking consistency, or collecting documentation are the ones most likely to have issues during an audit. If your employer denies a change because your paperwork is missing or the event does not fit, that denial is protecting the plan’s tax status for everyone in it.