Open enrollment is the annual window when you can sign up for a new Marketplace health insurance plan or change the one you have. Outside this window, you generally cannot enroll unless you qualify for a special enrollment period due to a life change. Dates, deadlines, and what you need to prepare all matter, so knowing what to expect before the window opens can save you time and help you avoid gaps in coverage.
At a glance
- Open enrollment happens once a year and is the main opportunity to enroll in or switch Marketplace health plans.
- There is typically an early deadline within the open enrollment window if you want coverage to start January 1.
- Returning enrollees should actively review their options each year rather than auto-renewing without checking.
What is open enrollment?
Open enrollment is a set period each fall and winter when anyone can apply for health insurance through the Marketplace (HealthCare.gov or a state-based exchange) regardless of health status. During this window, you can:
- Sign up for coverage for the first time.
- Switch to a different plan or metal tier.
- Update your income, household, or other information that affects your eligibility and premium tax credit.
- Renew your current plan for the new year.
No qualifying life event is needed. Open enrollment is available to everyone.
Key dates
For the plan year starting January 1, 2027:
| Milestone | Date |
|---|---|
| Open enrollment begins | November 1, 2026 |
| Deadline for January 1 coverage | December 15, 2026 |
| Open enrollment ends | January 15, 2027 |
Important: These dates are for the federal Marketplace (HealthCare.gov). If your state runs its own exchange (such as Covered California, NY State of Health, or others), dates may differ. Check your state exchange directly for confirmed deadlines.
These dates are confirmed for the 2027 plan year on HealthCare.gov.
What to prepare before you shop
Gathering this information before open enrollment starts will make the process faster and help you get a more accurate estimate of costs and financial help:
Income and household information
- Your estimated household income for the coming year (wages, self-employment income, Social Security, unemployment, and other taxable income for everyone in your tax household).
- The number of people in your tax household, including dependents.
- Social Security numbers or document numbers for everyone who will be on the application.
Current coverage details
- Your current plan name and ID number, if you have coverage now.
- Whether you currently receive a premium tax credit or cost-sharing reductions.
Healthcare needs
- A list of doctors, specialists, and facilities you want to keep seeing (to check plan networks).
- Prescription medications, including dosages (to check plan formularies).
- Any expected medical needs for the coming year: planned surgeries, ongoing treatments, or regular specialist visits.
Financial information
- Your most recent tax return or pay stubs to estimate income.
- Any expected income changes for the new year.
Step-by-step enrollment process
- Go to HealthCare.gov (or your state exchange) and create or log into your account.
- Complete or update your application with current income, household, and coverage information.
- Review your eligibility results, including any estimated premium tax credit or cost-sharing reduction.
- Browse available plans. Compare premiums, deductibles, out-of-pocket maximums, provider networks, and prescription coverage. Filter by the doctors and medications that matter to you.
- Select a plan and confirm your enrollment.
- Pay your first premium by the due date shown. Your coverage generally does not start until your first payment is received.
The early deadline matters
Open enrollment typically includes an early deadline for coverage starting January 1. If you enroll after the early deadline but before open enrollment closes, your coverage generally starts February 1 instead.
If you need coverage without a gap at the start of the year, plan to enroll before the early deadline. Do not wait until the final day of open enrollment if January 1 coverage matters to you.
What returning enrollees should do
If you had a Marketplace plan this year, you may be auto-renewed into the same plan or a similar one. However, auto-renewing without reviewing your options can cost you:
- Plan details change. Premiums, deductibles, networks, and formularies can all change from year to year, even for the same plan.
- Your financial help may change. The benchmark Silver plan in your area may be different, which changes your premium tax credit even if your income stays the same.
- Better options may exist. New plans may be available in your area, or a different metal tier may now be a better fit.
Take 15 to 30 minutes to log in, update your income estimate, and compare your current plan against alternatives. This is one of the most effective things you can do to avoid overpaying.
What happens after open enrollment closes
Once open enrollment ends, you generally cannot enroll in a Marketplace plan unless you qualify for a special enrollment period (SEP). Common qualifying events include:
- Losing other health coverage (such as leaving a job or aging off a parent's plan).
- Getting married or having a baby.
- Moving to a new area with different plan options.
- Changes in household income that affect Medicaid or Marketplace eligibility.
If you miss open enrollment and do not have a qualifying event, you may need to wait until the next open enrollment period, which could mean several months without Marketplace coverage.
State-specific variations
If you live in a state with its own health insurance exchange, your open enrollment dates, plan options, and enrollment process may differ from the federal Marketplace. For the 2027 plan year, states that run their own exchanges include California, Colorado, Connecticut, the District of Columbia, Georgia, Idaho, Illinois, Kentucky, Maine, Maryland, Massachusetts, Minnesota, Nevada, New Jersey, New Mexico, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia, and Washington.
Always confirm dates and enrollment steps through your state's exchange if applicable.
What to do next
Primary action: Start my application when open enrollment begins to see your plan options, check your eligibility for financial help, and enroll in coverage.
Alternative: Read Do I qualify for help paying for health insurance? to understand how income-based financial help works before you start shopping.
This article provides general educational information, not legal, tax, or financial advice. Plan availability, pricing, subsidies, and benefits depend on individual circumstances, location, and the current plan year, and may change.
