ACA Special Enrollment Periods: When You Can Enroll Outside Open Enrollment

SEP basics

ACA Open Enrollment runs annually from November 1 through January 15 in most states, with state-based exchanges sometimes setting their own dates. Outside that window, you typically cannot enroll in a Marketplace plan unless you qualify for a Special Enrollment Period.

SEPs are triggered by qualifying life events. Most give you 60 days from the event to enroll, and the Marketplace asks for documentation of the event when you apply. Some events allow advance enrollment in the 60 days before the event (for example, a known coverage end date).

Common SEP triggers

Loss of other health coverage

Losing job-based coverage (because you left the job, hours were reduced, or coverage ended), losing COBRA when it expires, losing Medicaid or CHIP eligibility, or losing dependent coverage when you turn 26 — all qualify. The SEP runs 60 days before through 60 days after the loss in most cases. Documentation is typically a letter from the insurer or employer showing the date coverage ended.

Marriage or divorce

Getting married opens an SEP for the new spouse and any dependents. Divorce can open an SEP for the spouse and dependents losing coverage as a result. Marriage SEP requires that at least one spouse had qualifying coverage for at least one day in the 60 days before the marriage (with exceptions for those moving from a foreign country or U.S. territory).

Birth, adoption, or foster care placement

Adding a child through birth, adoption, or foster placement triggers an SEP. The new coverage can be effective from the date of the event, and the SEP runs 60 days from the event for adding the child to existing coverage or enrolling in a new plan that covers the child.

Moving

Moving permanently to a new home in a new ZIP code or county that changes available plans qualifies. Moving into the U.S. from a foreign country or U.S. territory also qualifies. Moving for vacation or short-term reasons does not. The SEP runs 60 days from the move, and the Marketplace may require proof you had qualifying coverage one of the 60 days before the move.

Income changes affecting subsidy eligibility

For households already enrolled in Marketplace coverage, an income change that newly qualifies for or substantially changes Premium Tax Credit eligibility can trigger an SEP to update plan choice based on the new subsidy amount. This SEP is more limited and reporting income changes to the Marketplace is the first step.

Other qualifying events

Additional SEPs exist for becoming a U.S. citizen, leaving incarceration, gaining membership in a federally recognized tribe (with year-round SEP eligibility), and several less common situations. The Marketplace eligibility tool walks you through the qualifying event questions to identify what applies.

Enrollment paths that work differently

A few categories of people work differently from the usual 60-day clock:

• Households at or below 150% of FPL used to have a monthly enrollment option. It ended for 2026 coverage, and federal law and a 2027 federal rule keep it closed for 2027 and later years, so do not plan around it. HealthCare.gov's Special Enrollment Period page lists what applies now, including a path for households whose income dropped and who now qualify for savings.
• Members of federally recognized tribes can enroll or change plans monthly throughout the year.
• Medicaid and CHIP enrollment is open year-round; there is no Open Enrollment Period for those programs.

When coverage starts and what you may need to show

The start date depends on the event. HealthCare.gov says that for a marriage, if you pick a plan by the last day of the month your coverage can start the first day of the next month, and that for a birth, adoption or foster placement your coverage can start the day of the event. For loss of job-based coverage, HealthCare.gov says Marketplace plans take effect the first day of the month after that coverage ends.

The windows differ too. Most events give you 60 days, but HealthCare.gov lists 90 days for losing Medicaid or CHIP. You may be asked to submit documents confirming your event, and HealthCare.gov says that if you lose coverage and can't provide acceptable documents, you won't qualify for the Special Enrollment Period, so keep the termination letter, marriage certificate or lease handy before you apply.

If you are not sure an event counts, Open Enrollment for 2027 coverage runs November 1, 2026 through January 15, 2027 on HealthCare.gov, and December 15, 2026 is the last day to choose a plan that starts January 1. State-run marketplaces may set different dates.

How to enroll during an SEP

Apply through HealthCare.gov or your state-based exchange. The application asks about life events; identifying a qualifying event opens the SEP enrollment path. Have documentation ready — the Marketplace will ask for it before processing the enrollment, and incomplete documentation can delay coverage start.

You can also work with a licensed agent or broker who can walk you through eligibility, plan comparison, and enrollment. HealthCare.gov says agents and brokers are generally paid by the insurance companies whose plans they represent, and that to get Marketplace savings the agent or broker must enroll you through the Marketplace. Help from a Marketplace-certified assister is another option, listed on HealthCare.gov.

When the SEP doesn't apply

Some situations are not SEP triggers, despite being major life changes:

• Voluntarily dropping other coverage
• Loss of coverage due to non-payment of premium
• Eligibility for COBRA (you can still elect COBRA)
• Routine plan changes by your current carrier
• Moving for short-term reasons (vacation, school)

If your situation doesn't fit an SEP, the Open Enrollment Period (November 1 - January 15 in most states) is the next opportunity to enroll. Marketplace eligibility for SEPs is decided case-by-case based on the documentation provided.