Open Enrollment Timeline

Open Enrollment is the annual window during which anyone can sign up for or change their Marketplace health plan for the coming year. During this period you don't need a special reason to enroll — it's the one time each year the door is open to everyone.

For most states, Open Enrollment runs from November 1 through January 15. To have coverage effective January 1, you generally need to enroll by December 15. Enroll after that and coverage typically starts the first of the following month. A few states run their own exchanges with slightly different dates, so it's worth confirming the exact window for your state.

Your coverage choice sticks for the entire year unless you have a qualifying life event that opens a Special Enrollment Period. Because of this, it's important to use Open Enrollment to review not just whether you have coverage, but whether your current plan still fits — premiums and networks change from year to year, and plans sometimes disappear.

If you're receiving a premium tax credit, you should also update your income and household information during Open Enrollment. Your subsidy is recalculated based on your projected income for the new plan year, so an accurate estimate now helps avoid surprises when you file taxes.

What if you miss the deadline? Outside Open Enrollment you can only enroll with a qualifying life event — like marriage, a baby, job loss, or a move. There's no general 'late enrollment' path for most health plans, so missing the window can mean waiting until the next one unless an event applies to you.

The practical tip is to start early. Rather than waiting until the last week of December, begin comparing plans in November, when you have the full picture of what's available and time to ask questions. The best plan for you is the one that balances monthly cost, out-of-pocket exposure, and the doctors and drugs you actually use.