Still on the job at 65 with group health coverage? Whether you should take Medicare now or wait depends on your situation, and the wrong move can cost you a lifelong penalty. Here is how to get it right.
Turning 65 while you are still working does not force you off your employer plan, but it does start a clock. The right answer depends mostly on one thing: how many employees your company has, because that decides whether your group plan or Medicare pays first.
Get this right and you avoid paying for coverage you do not need, and you sidestep penalties that follow you for life. Get it wrong and it can be expensive and hard to undo.
| Employer size | Who pays first | Common move |
|---|---|---|
| 20 or more employees | Your group plan pays first, Medicare second | Many people take free Part A and delay Part B until they retire |
| Fewer than 20 employees | Medicare usually pays first | You typically need to enroll in Part A and Part B at 65 |
This is the single most important factor, and it is easy to assume wrong. Before you decide, confirm with your HR or benefits office in writing, and let us help you read it. One conversation can save you from a costly mistake.
Most people have paid in enough to get premium-free Part A, so many enroll at 65 even while working. The exception is below.
If you contribute to a Health Savings Account, enrolling in any part of Medicare, including free Part A, stops your HSA contributions. Many people delay all of Medicare to keep funding their HSA.
With a large employer you can usually delay Part B and pick it up later with no penalty using a Special Enrollment Period.
When your job or your group coverage ends, you get a Special Enrollment Period of up to 8 months to sign up for Part B without a late penalty. COBRA and retiree coverage do not extend this window, which surprises a lot of people, so it is important to act when active employment ends, not later.
If you delay Part B without qualifying employer coverage, Medicare adds 10% to your premium for each full 12-month period you waited — for life. Run your numbers below.
The Part B penalty adds 10% of the standard premium ($202.90 in 2026) for each full 12-month period you were eligible but didn't enroll (without other job-based coverage). It's added for as long as you have Part B.
Optional: fill these to auto-calculate your months late, or just type the number below.
$0.00
Estimated monthly penalty added to your Part B premium
Enter your months above to see your estimated penalty.
The Part D penalty adds 1% of the national base premium ($38.99 in 2026) for every full month you went without Part D or other creditable drug coverage (a gap of 63+ days). It's added for life.
Optional: fill these to auto-calculate your uncovered months, or just type the number below.
$0.00
Estimated monthly penalty added to your Part D premium
Enter your months above to see your estimated penalty.
Real reviews from people we have guided through the transition to Medicare.
We will look at your employer plan, your HSA, and your timing, and give you a clear plan so you never overpay or trigger a penalty. No fees, no obligation, no pressure.
Cole Insure, LLC is a licensed independent insurance agency. This is an advertisement for insurance. Coordination of benefits, enrollment timing, Special Enrollment Periods, and HSA rules depend on your specific employer coverage and personal circumstances; confirm details with your employer benefits administrator, the Social Security Administration, and a tax professional regarding HSAs. Penalty estimates use official 2026 figures (Part B $202.90; Part D base $38.99) and are illustrative, not a quote. Medicare has neither reviewed nor endorsed this information. We are not affiliated with or endorsed by the U.S. government or the federal Medicare program. To get information on all of your options, contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Program (SHIP). Details are current as of 2026 and subject to change.