ACA Open Enrollment 2026: Key Dates and What to Know

Health insurance through the Affordable Care Act (ACA) marketplace is only available to enroll in during specific windows. Knowing the 2026 dates — and preparing before they arrive — is the difference between locked-in coverage and a costly gap.

When Open Enrollment Happens

For most states, ACA Open Enrollment for 2026 coverage runs from November 1, 2025 through January 15, 2026. Enroll by December 15 for coverage that starts January 1; enroll between December 16 and the deadline and your coverage typically starts February 1.

A handful of states run their own marketplaces with slightly different deadlines, so always confirm the dates for your state.

Special Enrollment Periods

If you miss Open Enrollment, you can still get covered if you have a qualifying life event — losing job-based coverage, moving, getting married, or having a baby. These trigger a Special Enrollment Period, usually lasting 60 days from the event.

Lower-income households may also qualify to enroll year-round, depending on current rules and income level.

Understanding Subsidies

Many people qualify for premium tax credits that lower their monthly cost, and some qualify for cost-sharing reductions that shrink deductibles and copays. Eligibility is based on your household size and estimated income for the year.

It is worth checking every year, because subsidy amounts and income thresholds change and you may qualify for more help than you expect.

Choosing a Metal Tier

Marketplace plans come in Bronze, Silver, Gold, and Platinum tiers. Bronze has the lowest premiums and highest out-of-pocket costs; Platinum is the reverse. If you qualify for cost-sharing reductions, they only apply to Silver plans — an important detail many shoppers miss.

How to Prepare Now

Gather your income information, a list of your doctors and medications, and any current plan details before enrollment opens. Comparing plans side by side — or having a licensed specialist do it with you — helps you balance premium, network, and total expected costs rather than just the sticker price.