The 7-Month Window: When to Sign Up for Medicare

Most of the Medicare mistakes I help people fix come down to one thing: timing. Medicare isn't something you can sign up for whenever you get around to it. There's a specific window, it's only seven months long, and missing it can cost you money every single month for the rest of your life.

The good news? Once you understand the window, it's simple. Let's walk through it.

Your Initial Enrollment Period is 7 months

When you turn 65, you get a one-time Initial Enrollment Period (IEP) to sign up for Medicare Part A and Part B. It runs for seven months:

• The 3 months before the month you turn 65
• The month you turn 65
• The 3 months after the month you turn 65

So if your 65th birthday is in September, your window opens June 1 and closes December 31. That's it.

Some people are enrolled automatically — many are not

If you're already collecting Social Security benefits before 65, you'll usually be enrolled in Part A and Part B automatically — your card just shows up in the mail. Easy.

But if you haven't started Social Security yet (more and more people wait), nobody signs you up. It's on you to do it during that 7-month window. This is where a lot of folks get tripped up.

The penalty that follows you for life

Here's why the timing matters so much. If you miss your window and don't have other qualifying coverage, you can face a late enrollment penalty:

• Part B: your premium goes up 10% for each full 12 months you could have had it but didn't — and that higher premium sticks for as long as you have Part B.
• Part D (drug coverage): a separate penalty added to your premium for going without creditable drug coverage, also ongoing.

These aren't one-time fees. They're permanent. That's the part people don't realize until it's too late.

Still working at 65? The rules change

If you (or your spouse) are still working and have health coverage through an employer with more than 20 employees, you can usually take premium-free Part A and delay Part B without any penalty. When that job or coverage ends, you get a Special Enrollment Period to sign up.

But if your employer has fewer than 20 employees, or you're on COBRA, retiree coverage, TRICARE, or a Marketplace (ACA) plan, the rules are different — and those plans usually do not let you delay Part B safely. This is exactly the kind of situation worth a five-minute phone call before you make a move.

The bottom line

Mark your calendar three months before your 65th birthday. If you're not on Social Security, plan to actively enroll. And if you're still working, don't assume — confirm. Get the timing right and the rest of Medicare gets a whole lot less stressful.

Once your timing is set, the next step is choosing your coverage. If you're here in central Kentucky, my local Medicare guide for Lexington walks through your 2026 options, costs, and hospital networks in plain English.

Turning 65 soon? You can grab the free Kentucky Medicare guide. Or have a local agent walk you through your enrollment window so you don’t miss a deadline.

This article is general information, not advice for your specific situation, and Medicare rules can change. Tyler Insurance Group is not connected with or endorsed by the U.S. government or the federal Medicare program. For complete details on all your options, contact Medicare.gov or 1-800-MEDICARE.