The short answer: it depends on the path. Private plans enroll any month, and for most private plans on our site, applications submitted by the 23rd of the month start on the 1st of the next month. On the Marketplace, in most states you enroll by December 15 for a January 1 start. Whichever path you take, keep your old plan until the new one is in force.
The three paths and when each one starts
- A private plan, any month. No Open Enrollment window. For most private plans on our site, applications submitted by the 23rd of the month start on the 1st of the next month; some carriers allow mid-month starts. Private plans ask health questions, and approval is the carrier's decision, so the start date applies once you are approved.
- A life event. Losing other coverage, moving, marriage or a new baby can open a Special Enrollment Period on the Marketplace. You generally have about 60 days from the event to enroll, so tell us the date it happened.
- Marketplace Open Enrollment. In most states it runs November 1 through January 15 for coverage the following year (enroll by December 15 for a January 1 start); a few state-run exchanges use their own windows.
Whichever path fits, we confirm the exact effective date before you sign, and never backdate.
Picture it
You apply for a new plan on the 10th and feel relieved it is done. You book the specialist visit you have been putting off for the following week. At the front desk they ask for your new card, and you learn the plan does not start until the 1st of next month. The visit goes on the old plan, or on nothing at all.
Now picture the other version. Before you apply, we tell you the start date in writing. You book the visit for the week after it, keep your old plan until that day, and cancel it effective the same date. The carrier issues your ID card, usually by email within a day or two of approval, so it is in your hand before you need it.
Keep the old plan until the new one is in force
Do not cancel anything until the new plan is approved and you have its start date. The order matters: the new policy is in force first, then the old one is cancelled effective the same date, so you are never double-paying or uncovered. How to switch without a gap.
Starting late in the year?
A calendar-year deductible resets every January 1 no matter when you enrolled; a plan-year deductible resets on your enrollment anniversary. If your new plan starts in the fall, that detail can matter as much as the start date. When does my deductible reset?
Missed Open Enrollment? You may still have a way in. See which doors are still open, or compare ACA and private plans side by side.
This is general education, not tax advice and not a guarantee of coverage. Approval, start dates, enrollment windows and cancellation terms depend on the carrier, your state and underwriting.