What is the effective date?
The effective date is the date your insurance coverage commences. In most cases, this will always be the first of a future month, although a newborn baby or newly adopted child can have coverage retroactive to the date of birth or adoption.
Here’s more about how effective dates work when you enroll in a health plan through the exchange.
In most cases, employer-sponsored coverage will be effective the first of the month following your enrollment, or the first of the coming plan year if you enroll or make a plan change during your employer’s open enrollment period.
Similarly, individual market coverage will generally be effective the first of the month after you enroll during a special enrollment period, or on January 1 if you enroll during the annual open enrollment period. For enrollments submitted during special enrollment periods, state-run Marketplaces previously had some flexibility on effective dates. But the rules were standardized nationwide as of 2025.
During open enrollment for individual market coverage, most years have included an option to enroll in a plan with a February 1 effective date, but that’s no longer available as of the 2027 plan year.
During the open enrollment period in the fall of 2026, open enrollment will end on December 15 in states that use HealthCare.gov. State-run exchanges will have the option to extend open enrollment until as late as December 31, but not into January. And all plans selected during open enrollment will have a January 1 effective date. This is due to a federal rule change that was implemented in 2025.