What Is Open Enrollment?
Open enrollment is a set period each year during which you can enroll in, change, or cancel a health insurance plan. Outside of this window, you generally cannot sign up for coverage unless you qualify for a Special Enrollment Period (SEP). Missing open enrollment can mean going without coverage for up to a year.
Key Open Enrollment Dates
- ACA Marketplace Plans: Typically November 1 – January 15 (exact dates may vary by year and state). Coverage starts January 1 for enrollments completed by December 15.
- Employer-Sponsored Coverage: Varies by employer — usually in the fall. Check with your HR department.
- Medicare: Annual Enrollment Period runs October 15 – December 7.
- Medicaid & CHIP: Open year-round for eligible individuals — no enrollment window required.
Step-by-Step: How to Enroll Through the ACA Marketplace
- Gather your information. You'll need Social Security numbers for all household members, income estimates for the upcoming year, current employer coverage details (if any), and immigration documents if applicable.
- Create or log into your account. Visit HealthCare.gov (or your state's marketplace if it runs its own). Create a secure account with your email.
- Complete your application. Enter household size, income, and current coverage status. The system will determine your eligibility for subsidies (premium tax credits) and cost-sharing reductions.
- Compare plans. Review plans by metal tier (Bronze, Silver, Gold, Platinum), monthly premium, deductible, and network. Use the plan comparison tool to see how costs would differ for your expected care.
- Enroll and pay your first premium. Select your plan and complete enrollment. Your coverage won't begin until you pay your first month's premium.
Metal Tiers Explained
| Tier | Insurer Pays (Average) | You Pay (Average) | Best For |
|---|---|---|---|
| Bronze | ~60% | ~40% | Healthy, low-use individuals |
| Silver | ~70% | ~30% | Most enrollees; required for cost-sharing reductions |
| Gold | ~80% | ~20% | Those with regular medical needs |
| Platinum | ~90% | ~10% | High medical users who want predictability |
What Is a Special Enrollment Period?
If you miss open enrollment, you may still qualify for a Special Enrollment Period (SEP) if you experience a qualifying life event, such as:
- Losing job-based coverage
- Getting married or divorced
- Having or adopting a child
- Moving to a new coverage area
- Gaining citizenship or lawful presence
You typically have 60 days from the qualifying event to enroll.
Common Enrollment Mistakes to Avoid
- Underestimating income, which can lead to having to repay excess tax credits
- Choosing a plan based solely on the lowest premium
- Not verifying your doctors are in-network before enrolling
- Forgetting to check prescription drug coverage (formulary)
- Missing the deadline and ending up uninsured
Taking an extra hour during open enrollment to compare options carefully can save you significant money and hassle throughout the year.