What Is Open Enrollment?

Open enrollment is a set period each year during which you can sign up for health insurance, switch plans, or drop coverage. Outside of this window, you generally cannot enroll in or change a health plan unless you qualify for a Special Enrollment Period (SEP).

There are two main types of open enrollment to know about:

  • ACA Marketplace open enrollment: Typically runs from November 1 through January 15 in most states (some state-run exchanges have different dates)
  • Employer-sponsored plan open enrollment: Set by your employer, often in the fall for coverage starting January 1

Key Dates to Know (ACA Marketplace)

Action Typical Deadline
Enroll for January 1 coverage start December 15
Enroll for February 1 coverage start January 15
Open enrollment window closes January 15 (federal exchange)

Note: State-run exchanges (like California's Covered California or New York State of Health) may have extended deadlines. Always verify with your specific exchange.

Step-by-Step: How to Enroll Through the ACA Marketplace

  1. Gather your information: Social Security numbers for everyone enrolling, income information (pay stubs, tax returns), and dates of birth
  2. Create or log into your account: Visit HealthCare.gov (or your state's exchange website)
  3. Fill out your application: Enter household size and estimated annual income — this determines whether you qualify for subsidies
  4. Compare plans: Review available plans by premium, deductible, network, and estimated total costs
  5. Enroll and confirm: Select your plan and pay your first premium to activate coverage

Financial Help: Subsidies You May Qualify For

Based on your household income relative to the federal poverty level (FPL), you may qualify for:

  • Premium Tax Credits (PTCs): Reduce your monthly premium cost. Available if your income falls between 100% and 400% FPL (and in some cases above that threshold)
  • Cost-Sharing Reductions (CSRs): Lower your deductible, copays, and out-of-pocket maximum. Only available with Silver-tier plans

What Happens If You Miss Open Enrollment?

If you miss the window, you must wait until the next open enrollment period — unless you experience a qualifying life event that triggers a Special Enrollment Period. Qualifying events include:

  • Losing existing coverage (job loss, aging off a parent's plan)
  • Getting married or divorced
  • Having or adopting a child
  • Moving to a new coverage area

SEPs typically give you 60 days from the qualifying event to enroll.

Tips for a Smooth Enrollment

  • Don't wait until the last day — website traffic peaks at deadlines
  • Use the plan comparison tools to estimate your annual total cost, not just the monthly premium
  • Verify your doctors and hospitals are in the plan's network before enrolling
  • If you need help, free assistance is available through certified navigators and brokers

Taking the time to understand and use open enrollment correctly can save you hundreds — or thousands — of dollars each year.