Pick the situation that fits → see your exact 2026 enrollment window.
Quick answer: Your Medicare enrollment window depends on your situation. Most people use their 7-month Initial Enrollment Period (the 3 months before, the month of, and 3 months after your 65th birthday). Others qualify for a Special Enrollment Period — losing employer coverage or moving — while the rest use the General (Jan–Mar) or Annual (Oct 15–Dec 7) windows. Enrolling in the right one avoids permanent late penalties.
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Special Enrollment Periods are where the off-season sales are — but only if you catch them in time. Our SEP & AEP trackers (Excel + Google Sheets) flag every client window automatically so you work the calendar instead of memorizing it.
See the enrollment toolkits on Etsy →| Window | When | What you can do |
|---|---|---|
| Annual Enrollment (AEP) | Oct 15 – Dec 7 | Change anything; effective Jan 1 |
| Medicare Advantage OEP | Jan 1 – Mar 31 | Switch MA plans once, or return to Original Medicare + a Part D plan |
| Initial Enrollment (IEP) | 7 months around your 65th birthday | Enroll for the first time |
| Special Enrollment (SEP) | Triggered by a life event | Varies — usually about 2 months from the event |
October 15 through December 7. Changes you make take effect January 1.
January 1 to March 31. If you're already in a Medicare Advantage plan, you can make one switch — to a different MA plan, or back to Original Medicare with a Part D plan.
Life events such as losing employer coverage, moving out of your plan's area, your plan leaving, or qualifying for Medicaid/Extra Help. Most SEPs last about two months, but the exact rules vary — confirm with Medicare or a licensed agent.