Open Enrollment

Open enrollment is the defined period each year when employees choose their benefits for the upcoming plan year: medical, dental, and vision coverage, which dependents to cover, flexible spending or health savings account contributions, and voluntary benefits such as supplemental life or disability coverage.

Most employers run a window of one to three weeks, ending well before the plan year starts so elections can be loaded, verified, and sent to carriers.

Why elections lock for a year

Employee contributions for most group health coverage are taken pre-tax through a cafeteria plan under Section 125 of the Internal Revenue Code. The tax treatment is conditioned on the election being irrevocable for the plan year, with changes allowed only in the limited circumstances the rules describe.

That is why an employee who wants to add a spouse in March cannot simply do it. It is not the benefits team being rigid, it is the condition attached to the pre-tax treatment of the premium. The exceptions are real and specific, which is what makes the qualifying life event process a distinct workflow rather than an exception queue.

Separately, insurers price a plan on the population that enrolls, so a mid-year election free-for-all would let people buy coverage only when they expect to need it. The annual window is what makes the pricing work.

Running an open enrollment

A workable sequence, starting roughly two to three months before the window opens.

1. 1Set the plan year and the enrollment window, and confirm both against the carrier deadlines and the payroll calendar so the first deduction of the new plan year lands correctly.
2. 2Finalize plan design and rates, including the employee contribution for every plan and coverage tier, and confirm the employer contribution strategy.
3. 3Decide active versus passive enrollment, and document exactly what carries over. Flexible spending account elections do not carry over and must be re-elected every year.
4. 4Configure and test the enrollment setup end to end: plans, tiers, rates, eligibility rules, dependent rules, effective dates, and the payroll deduction mapping. Test with real employee scenarios, including a new hire, a family tier, and a mid-window change.
5. 5Assemble the participant notices that have to go out, confirm the distribution method, and record when and how each was delivered.
6. 6Communicate on a schedule: an announcement before the window, a plan comparison and cost calculator during it, live or recorded sessions, and reminders at the midpoint and in the final 48 hours.
7. 7Open the window and monitor completion by population, not just in total. Chase the non-responders directly, because the last 10 percent are rarely reached by another all-company email.
8. 8Close the window, freeze elections, and reconcile the enrollment file against both the carrier records and the payroll deduction setup before the plan year starts.
9. 9Send each employee a confirmation statement showing their elections, covered dependents, and per-paycheck cost, and open a short correction period for data errors.
10. 10Audit the first two payroll runs of the new plan year against elected coverage, and reconcile the first carrier invoice against enrollment.

Qualifying life events that allow a mid-year change

These are the situations that generally permit an election change outside the annual window. The change requested must be consistent with the event.

• Marriage, divorce, legal separation, or annulment.
• Birth, adoption, placement for adoption, or a court order requiring coverage of a child.
• Death of a spouse or dependent.
• A change in employment status for the employee, spouse, or dependent that affects benefit eligibility, including starting or ending a job, or moving between full time and part time.
• A dependent gaining or losing eligibility, most commonly a child reaching the plan's age limit.
• Loss of other coverage, including a spouse's employer coverage ending or eligibility for Medicaid or a state child health program ending.
• Becoming eligible for premium assistance under Medicaid or a state child health program.
• A change in residence that affects which plans are available, such as moving out of a plan's service area.

Administering a qualifying life event

The event itself is only half of it. The deadlines are the part that trips employers up.

• Employers commonly give employees 30 days from the event to request a change, and the plan document, not custom, sets the actual window.
• Certain special enrollment rights, including loss of eligibility for Medicaid or a state child health program and becoming eligible for premium assistance, carry a longer window of 60 days.
• Supporting documentation should be defined in advance by event type, so the request is not delayed while someone decides what proof is needed.
• The election change must be consistent with the event. A birth supports adding the child and moving to a family tier, it does not support switching to a different medical plan unless the plan permits it.
• The effective date rule has to be written down. Coverage for a newborn commonly reverts to the date of birth, while other events are effective on the event date or the first of the following month.
• Late requests are the recurring problem. An employee who misses the window generally waits until the next open enrollment, which is a difficult conversation best prevented by reminding employees at the moment life events are likely, such as during parental leave intake.

The failures that show up in January

• Rates loaded into the enrollment system but not into payroll, so deductions are wrong on the first check of the plan year.
• A carrier file that never reconciled, so employees appear enrolled internally and are turned away at a pharmacy counter.
• Dependents rolled forward past the plan's age limit because passive enrollment carried them without a check.
• Flexible spending account elections assumed to have carried over, leaving employees with no election and no way to fix it.
• Terminations processed during the window that never reached the carrier, generating premium for people who have left.
• No record of which notices were distributed, when, and how, which is the first thing requested if the plan is ever examined.