Open Enrollment is the one annual window when anyone can enroll in, change, or drop ACA marketplace health insurance without needing a qualifying life event. Miss this window and you may wait a full year unless a life change triggers Special Enrollment.
| Key date | What it means |
|---|---|
| November 1, 2026 | Open Enrollment begins. You can enroll in or change 2027 plans starting this date. |
| December 15, 2026 | Deadline to enroll for coverage starting January 1, 2027. |
| January 1, 2027 | 2027 coverage begins for plans selected by December 15. |
| January 15, 2027 | Open Enrollment closes. Last day to enroll (coverage starts February 1, 2027). |
| After January 15, 2027 | Enrollment closed. Only qualifying life events trigger Special Enrollment. |
What Open Enrollment Is
The ACA marketplace operates on an annual enrollment cycle. Outside of the November–January window, you can only enroll or change plans if you have a qualifying life event (QLE) that triggers a 60-day Special Enrollment Period. Open Enrollment removes that restriction — anyone can enroll or change plans during this window, regardless of their health status or life circumstances.
Open Enrollment applies to ACA marketplace plans purchased through healthcare.gov or state-based exchanges. Employer group plans have their own annual enrollment periods set by the employer, which typically run in the fall but may differ. Medicaid has no enrollment window — you can apply year-round if you meet income and eligibility requirements.
What to Do Before November 1, 2026
Open Enrollment rewards preparation. People who research plans in advance — rather than enrolling on the last day — consistently make better choices and catch issues before they become expensive surprises. Before November 1:
- Estimate your 2027 income: Your premium tax credit (subsidy) is calculated based on your projected Modified Adjusted Gross Income. If you are self-employed, use your best estimate of net self-employment income after business expenses. If your income will be significantly different from 2026, your subsidy amount will change.
- List your doctors and medications: Know the names of your primary care physician, any specialists, and your preferred hospital. Write down every prescription you take and the dosage. You will use this list to verify network and formulary coverage on any plan you consider.
- Check whether your current plan auto-renews: Marketplace plans auto-renew if you take no action, but the plan details (premium, deductible, network) may change year over year. Never assume your 2026 plan is optimal for 2027 without reviewing.
- Contact a licensed broker before enrollment opens: A broker can pull your 2027 options before enrollment opens so you are ready to enroll on November 1, not scrambling in January.
December 15 vs. January 15: Which Deadline Matters
There are two deadlines within Open Enrollment. The December 15 deadline gives you January 1 coverage — a gap-free transition into the new year. The January 15 final deadline gives you February 1 coverage, meaning you are uninsured for January if you start fresh. If you are currently uninsured or your current plan ends December 31, the December 15 deadline is the critical one.
If you are switching plans (already enrolled in a 2026 plan that is auto-renewing), you can make your final decision any time through January 15 since your existing plan covers January 1 regardless.
What If You Miss Open Enrollment?
After January 15, 2027, the marketplace closes to new enrollment until November 1, 2027 unless you have a qualifying life event. Common qualifying events that open a 60-day Special Enrollment Period include:
- Losing employer health coverage (layoff, reduction in hours, end of COBRA)
- Losing Medicaid or CHIP eligibility
- Marriage or divorce
- Birth or adoption of a child
- Moving to a new coverage area (new state or county)
- Turning 26 and aging off a parent’s plan
- Gaining citizenship or lawful presence
If you do not have a qualifying event and miss Open Enrollment, your options outside the marketplace include short-term plans, fixed-indemnity products, and health sharing ministries — none of which are ACA-compliant and all of which lack the consumer protections ACA plans provide. Avoiding this gap is one of the strongest reasons to prioritize the Open Enrollment window.
State-Based Exchanges: Different Deadlines
If you live in California, Colorado, Connecticut, Idaho, Kentucky, Maine, Maryland, Massachusetts, Minnesota, Nevada, New Jersey, New Mexico, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia, or Washington, your state operates its own marketplace. State-based exchange deadlines typically align with the federal dates but some states extend enrollment longer. Check your state’s specific marketplace for exact 2027 deadlines.
A licensed broker can guide you through enrollment on any exchange — federal or state-based — at no cost. Call (713) 575-9904 to get a free plan comparison before Open Enrollment opens.