Every fall, the same thing happens to a lot of people. The renewal email arrives, it gets flagged “for later,” and later turns out to be mid-December. By then, the choice is no longer which plan to pick, but whether coverage will start on time.
For 2027 coverage, the calendar is simple once you see it. On HealthCare.gov, three dates do most of the work: November 1, December 15 and January 15.
Here is what each one means, what happens if you do nothing, and a short checklist to get through enrollment without surprises.
The three dates that matter
Dates from HealthCare.gov for states using the federal Marketplace. Some states run their own marketplaces and set different deadlines.
Why December 15 is the date to circle
January 15 gets attention because it is the last day of Open Enrollment. But if you want coverage that starts on January 1, the date that matters is December 15.
Enroll after December 15 but by January 15, and coverage generally starts February 1. That can leave a one-month gap if your current coverage ends December 31. A month without coverage may not sound like much, until something happens in it.
What happens if you do nothing
If you already have a Marketplace plan and do not act, HealthCare.gov may automatically re-enroll you so you do not lose coverage. Automatic renewal is convenient, but it is not the same as choosing.
Even if you plan to keep your plan, it is worth logging in, updating your information and confirming what you will pay.
Related: You Didn’t Change Your Health Plan. So What Changed?
Your income estimate matters more than you think
Financial help with Marketplace premiums, called the premium tax credit, is based on the household income you expect for the coming year. If your estimate is too low, you may have to pay some of the credit back when you file taxes. If it is too high, you may get less help than you could during the year.
The amount of financial help available can also change from year to year. Do not assume your 2027 premium will match 2026. Update your application and compare the new numbers.
Related: Your ACA Enrollment Looks Finished. One More Step Could Still Matter
A 15-minute enrollment checklist
- Log in and update your application. Check household members, address and expected income for 2027.
- List your doctors and prescriptions. Write down who you see and what you take before you compare plans.
- Compare at least three plans. Look past the premium to the deductible, out-of-pocket maximum and copays.
- Check networks and drug lists. Confirm your doctors and medicines are covered by each plan you are considering.
- Enroll by December 15 if you want coverage to start January 1.
- Pay your first premium. Coverage generally does not start until the first payment is made.
Related: Don’t Click “Enroll” Just Yet: 8 Things to Check on Your Health Plan
Missed the window? You may still have options
After Open Enrollment ends, you generally need a Special Enrollment Period to sign up or change plans. These are usually triggered by certain life events, for example:
- Losing other health coverage, such as job-based insurance
- Moving to a new area with different plan options
- Getting married, having a baby or adopting a child
- Certain changes in household income or other circumstances
Special Enrollment Periods have their own deadlines, often around 60 days from the event, and may require documents. Medicaid and the Children’s Health Insurance Program (CHIP) generally accept applications year-round. Check HealthCare.gov for the rules that apply to you.
Watch for enrollment scams
Enrollment season brings a wave of calls, texts and ads offering “free” plans or urgent deadlines. Use HealthCare.gov or your state’s official marketplace directly, or a licensed agent or official assister you have verified. Never share your login or Social Security number with an unexpected caller.
Related: Is That Insurance Text Real? A 30-Second Checklist
Two things people get wrong
Which situation looks like yours?
How to compare plans in about ten minutes
The plan list on the Marketplace can be long. A simple way to narrow it down is to estimate each plan’s total yearly cost, not just its monthly premium.
Here is a made-up comparison to show the idea. These numbers are for illustration only.
Hypothetical example. Actual premiums, deductibles and maximums vary by plan, location and income.
In this example, the plan with the higher premium costs less in a typical year and much less in a bad one. Your result depends on your own plans and expected care.
Related: Your Health Plan Has a Number That Can Cap Your Bills. Most People Never Look for It
Metal levels in one minute
Marketplace plans are grouped into metal levels. The level is about how costs are split between you and the plan, not the quality of care.
- Bronze: usually lower premiums and higher costs when you get care. Starting in 2026, bronze plans can be paired with a Health Savings Account.
- Silver: moderate premiums and costs. If your income qualifies, silver plans can come with cost-sharing reductions that lower deductibles and copays.
- Gold: usually higher premiums and lower costs when you get care.
- Catastrophic: available to certain people, such as those under 30 or who qualify for an exemption, with very high deductibles.
Related: Have a Bronze Plan? You May Now Be Able to Open This Tax-Saving Health Account
What to have ready before you log in
Gathering a few things first makes the application faster and reduces mistakes:
- Social Security numbers, or document numbers for eligible immigrants, for each person applying
- Recent pay stubs, W-2 forms or other proof of income, and your best estimate of 2027 household income
- Information about any job-based coverage offered to anyone in the household, even if you do not take it
- Policy numbers for any current health coverage
- A list of your doctors, hospitals and prescriptions, to check against each plan
Free help is available
You do not have to do this alone. HealthCare.gov has a “find local help” tool that lists trained assisters, sometimes called Navigators, who can help you apply and compare plans at no cost. Licensed agents and brokers can also help, and are generally paid by insurers rather than by you.
Whoever you work with, you should never be asked to pay a fee to enroll in a Marketplace plan through official channels, and you should never share your HealthCare.gov password with anyone.
Frequently asked questions
When is Open Enrollment for 2027 coverage?
On HealthCare.gov, it runs from November 1, 2026 to January 15, 2027. Enroll by December 15 for coverage starting January 1. Some state marketplaces have different dates.
What if I enroll on January 10?
On HealthCare.gov, enrolling after December 15 but by January 15 generally means coverage starts February 1.
Will I be automatically re-enrolled?
If you have Marketplace coverage now, you may be automatically re-enrolled if you take no action. It is still wise to update your application and review your plan.
Does Open Enrollment apply to employer insurance or Medicare?
No. Employers set their own enrollment periods, and Medicare has a separate annual enrollment period. This article covers the ACA Marketplace.
Keep reading
Sources to review: HealthCare.gov, “Dates and deadlines for 2027 health insurance”; HealthCare.gov pages on Special Enrollment Periods and the premium tax credit; your state’s marketplace website.
This article is educational information, not legal, tax or financial advice. Dates shown apply to HealthCare.gov and may differ in state-run marketplaces. Confirm current deadlines with official sources.