Still Working at 65?
Working Past 65: should you take Medicare now, or wait?
If you’re still working when you turn 65, enrolling in Medicare isn’t automatic — and it isn’t always the right move. Whether you can safely wait comes down to your employer’s size and the kind of coverage you have. Let’s get it right, so you don’t trigger a penalty or a gap you didn’t see coming.
No pressure. No obligation. Just clarity.
The Short Answer
Do I have to take Medicare if I’m still working at 65?
Not always. If you have coverage through a current employer with 20 or more employees, you can usually delay Part B without penalty and enroll later through a Special Enrollment Period. If the employer has fewer than 20 employees, Medicare generally becomes your primary coverage at 65 — and delaying can leave you with gaps and penalties. Employer size is the pivot everything turns on.
Almost everyone approaching 65 while working asks the same thing: do I sign up now, or keep what I have? The honest answer is that it depends on a few specific facts about your coverage — and getting those facts straight before your birthday is what keeps this simple. Below, I walk through the decision the way I walk through it with my own clients.
Cindy Kowalski · Licensed Independent Medicare Advisor · Eligry LLC · NPN 21601670
Factor by Factor
How to decide whether to enroll or wait
Decision Factor 1
Does my employer’s size change what I should do?
Yes — more than anything else. At an employer with 20 or more employees, your group plan stays primary and you can usually delay Part B penalty-free. At an employer with fewer than 20 employees, Medicare becomes primary at 65, so delaying can leave your claims underpaid and expose you to penalties.
Medicare’s rules hinge on a “who pays first” question. At a large employer (20+ employees), your group health plan pays first and Medicare would be secondary — so there’s usually no penalty for waiting on Part B while you’re actively covered. At a small employer (fewer than 20), Medicare is designed to pay first once you turn 65, and your group plan pays second. If you skip Medicare in that situation, the second payer may only cover what Medicare would have — leaving you owing the rest.
The trap most people don’t see coming
Assuming you can delay because “I still have insurance.” At a small employer, that assumption can mean unpaid claims and a late enrollment penalty that may continue for as long as you have Part B. Confirm your employer’s size and who pays first before you decide anything.
Decision Factor 2
Should I take Part A at 65 if I’m still working?
Usually yes — Part A is premium-free for most people, so it can quietly sit alongside your employer plan. The major exception is if you contribute to a Health Savings Account: once any part of Medicare begins, including Part A, you can no longer contribute to an HSA.
For most people, enrolling in premium-free Part A at 65 costs nothing and simply adds a layer of hospital coverage behind your employer plan. But if you’re still contributing to an HSA, timing matters: HSA contributions and Medicare don’t mix. And because Part A can be granted retroactively up to six months when you enroll after 65, you generally need to stop HSA contributions several months before you plan to start Medicare or claim Social Security.
Decision Factor 3
Should I delay Part B while I’m working?
If your coverage is through current employment at a large employer (20+), delaying Part B is often the smart move — you avoid paying the premium now and pick it up penalty-free when you retire. At a small employer, or without current-employment coverage, you’ll usually want Part B at 65 to avoid gaps and penalties.
Part B is where the real decision lives, because it carries a monthly premium and a lasting penalty if you enroll late without a valid reason. The key phrase is current employment: to safely delay Part B, your coverage has to come from a job you (or your spouse) are actively working — not retiree coverage, not COBRA, not a Marketplace plan. When it’s genuinely current-employment coverage at a large employer, you get a Special Enrollment Period to add Part B later without penalty.
Decision Factor 4
Do COBRA, retiree, or severance coverage let me delay Medicare?
No — and this is the costliest misunderstanding in the whole decision. Only coverage from active, current employment lets you delay Part B without penalty. COBRA, retiree plans, severance continuation, and Marketplace coverage do not count, even though they pay claims.
These plans feel like employer coverage, so people assume they buy time. They don’t. The moment your active employment ends, your Medicare enrollment clock starts — regardless of how long COBRA or retiree coverage lasts afterward. Treating COBRA as permission to wait is how people end up with a penalty and a coverage gap they never saw coming.
Watch out
If you’re leaving a job, your Part B window opens when your active employment ends — not when COBRA runs out. If you’re at that stage, the Retiring or Losing Coverage guide walks the timing step by step.
Decision Factor 5
What happens when I finally retire or lose the coverage?
When your current-employment coverage ends, an 8-month Special Enrollment Period opens for Part B, and a separate 63-day window opens for Part D. The deadline is generous, but the smart move is to have Medicare active the day your old plan stops — not eight months later — so there’s no gap.
This is the handoff that has to be timed cleanly. You get an 8-month window to enroll in Part B without penalty and roughly 63 days to pick up a Part D drug plan — both starting when your active coverage ends. Using all eight months usually means a stretch with no medical coverage, which is exactly what you don’t want. Because Part B and your chosen plan take a few weeks to activate, the practical move is to start the paperwork two to three months ahead. This is also the moment you choose how you’ll receive Medicare going forward.
Decision Factor 6
What about my prescription drug coverage?
If your employer drug coverage is “creditable” — at least as good as Medicare’s — the years you have it don’t count against you. Keep every annual creditable-coverage notice. Once that coverage ends, you have about 63 days to enroll in Part D to avoid a penalty that may continue for as long as you have Part D.
Ask your benefits administrator, in writing, whether your employer’s drug coverage is creditable, and save the notice they send each year. It’s your proof that you weren’t going without coverage. When you eventually move to Medicare, you’ll have roughly 63 days from the end of that creditable coverage to add a Part D plan — wait longer and a late enrollment penalty can be added to your premium for as long as you have Part D.
At a Glance
Large employer vs. small employer: what changes
Your employer’s size decides who pays first, whether you can safely delay Part B, and what happens if you wait. Here’s the side-by-side.
| Large employer (20+ employees) | Small employer (fewer than 20) | |
|---|---|---|
| Who pays first | Your group plan pays first; Medicare is secondary | Medicare pays first at 65; your group plan is secondary |
| Can you delay Part B? | Usually yes, penalty-free, while actively covered | Generally no — you’ll usually want Part B at 65 |
| Take premium-free Part A? | Usually yes (unless you contribute to an HSA) | Usually yes (unless you contribute to an HSA) |
| Risk if you delay | Low, as long as coverage is current employment | Underpaid claims and a lasting Part B penalty |
| When you stop working | 8-month Part B window opens; plan a gap-free start | Same 8-month window if you delayed for another valid reason |
Not sure how big your employer counts as? It’s based on employee count rules that can include affiliated companies — one of the first things I confirm for you, because the whole decision rests on it.
Which One Is You?
Find your situation
You likely can delay Part B
Your group plan stays primary. Take premium-free Part A (watch the HSA rule), and enroll in Part B later through your Special Enrollment Period when the job ends.
You likely should enroll at 65
Medicare becomes primary, so waiting can leave claims underpaid. Most people in this spot enroll in Parts A and B during their Initial Enrollment Period.
It depends on their employer
The same size rules apply — but to your spouse’s employer, and the coverage must be from their current job. We confirm which threshold applies.
Usually enroll at 65
Individual and Marketplace plans aren’t current-employment coverage, so they don’t let you delay penalty-free. Most people here move to Medicare at 65.
Still working and want a quick read on your situation? Take the Employer vs. Medicare quiz — it points you toward enrolling now or waiting, with no contact info required.
How I Help
How an independent advisor makes this simple
I sequence the whole decision for you — the employer rules, the HSA timing, the enrollment windows — and give you a clear answer for your exact situation. Carriers pay me when someone enrolls; you never pay me directly.
Confirm your coverage facts
Employer size, whether it’s current employment, and who pays first — the facts the whole decision rests on.
Sort out Part A and your HSA
Whether to take premium-free Part A now, and how to time it around any HSA contributions.
Decide on Part B
Delay penalty-free, or enroll now — based on your employer, not a guess.
Plan the gap-free exit
When the job ends, we time Part B, Part D, and your plan so Medicare is ready the day your coverage stops.
Common Questions
Working past 65, answered
Do I have to enroll in Medicare at 65 if I’m still working?
Not always. If you have coverage through a current employer with 20 or more employees, you can usually delay Part B without penalty and enroll later. If your employer has fewer than 20 employees, Medicare generally becomes primary at 65, so you’ll usually want to enroll. Confirm your employer’s size before you decide.
Can I delay Part B without a penalty?
Yes, if your coverage comes from active, current employment at a large employer (20+). That gives you a Special Enrollment Period to add Part B later without penalty. The coverage has to be current-employment based — retiree, COBRA, severance, and Marketplace plans don’t qualify.
What if my employer has fewer than 20 employees?
Then Medicare is generally designed to pay first once you turn 65, and your group plan pays second. If you delay Medicare, your group plan may only cover what Medicare would have — leaving you owing the difference. Most people at small employers enroll in Parts A and B at 65.
Can I keep contributing to my HSA after 65?
Not once any part of Medicare begins, including premium-free Part A. Because Part A can be granted retroactively up to six months when you enroll after 65, you generally need to stop HSA contributions several months before starting Medicare or claiming Social Security, to avoid a tax problem.
Does COBRA count as employer coverage for Medicare?
No. COBRA is not active, current-employment coverage for Medicare purposes. Your Part B and Part D enrollment clocks start when your active employment ends — not when COBRA ends. Relying on COBRA to delay Medicare is one of the most costly mistakes people make.
How long do I have to enroll when I stop working?
You get an 8-month Special Enrollment Period for Part B and a separate 63-day window for Part D, both starting when your current-employment coverage ends. The deadline is generous, but enrolling early enough for a gap-free start is the smart move, since Part B and your plan take a few weeks to activate.
Do I still need Part D if my employer has drug coverage?
Only if your employer drug coverage is “creditable” — at least as good as Medicare’s. If it is, you carry no penalty for the time you had it; keep the annual creditable-coverage notice as proof. Once that coverage ends, you have about 63 days to add Part D to avoid a penalty that may continue for as long as you have Part D.
Is my spouse’s employer plan enough to let me delay?
It can be — the same rules apply, but to your spouse’s employer. The plan must be from their current employment, and their employer’s size (20+ vs. fewer) determines whether you can delay Part B without penalty. It’s worth confirming rather than assuming.
Free Guide
Prefer it all in one place?
Get the plain-English Working Past 65 Medicare guide — the employer-size rules, the HSA trap, and how to plan a gap-free start — sent straight to your inbox.
Get the Free Working Past 65 Guide →Still working at 65? Let’s time it right.
No forms, no pressure, no cost to you — just an honest walk-through of your employer coverage, your options, and exactly when your Medicare should begin.
In Indiana? Call (219) 408-9399 · By appointment, 7 days a week · Licensed independent Medicare advisor · No cost to you, ever.
We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options.
I’m appointed with a limited number of carriers, so there are plans I can’t enroll you in. That doesn’t mean I won’t talk about them. When I review your situation, I look at the options that actually fit you—including the ones I can’t sell—and I’ll tell you what I find either way. If the better fit is somewhere I can’t take you, I’ll say so and point you to Medicare.gov or 1-800-MEDICARE.
Not affiliated with or endorsed by the government or federal Medicare program. This page is general education, not advice about a specific plan. Your enrollment windows and rights depend on your own dates, employer, and state.