Working Past 65 | Medicare Pitfalls to Avoid

What Medicare Mistakes Should I Watch for If I’m Working Past 65?

Direct answer: The core question of whether you can delay Medicare Part B while working depends on your employer’s size — covered in detail here. But several specific traps catch people even after they understand that basic rule: assuming COBRA counts as active coverage (it doesn’t), assuming you can keep an ACA marketplace plan affordably past 65 (you generally can’t), and assuming that having a retirement package means you’re covered when actually both spouses have already retired (you’re not). Each of these has real financial consequences if you get it wrong.

Does COBRA Count as Active Employer Coverage?

No — and this is one of the most consequential misunderstandings in this whole topic. To delay Medicare Part B without penalty, your employer coverage must be active, meaning it comes from your current job or your working spouse’s current job right now. COBRA continuation coverage, even though it technically continues your former employer’s plan, does not count as active coverage for Medicare enrollment purposes.

If you’re relying on COBRA and assuming it gives you more time before you need Medicare, you’re likely accumulating a late enrollment penalty during that entire period without realizing it. This is worth confirming directly rather than assuming, since the consequences are permanent.

What If Both My Spouse and I Are Already Retired?

If you have a retirement package but both you and your spouse are retired — meaning neither of you has active employer coverage — you generally need to enroll in Medicare Part B to avoid penalties, regardless of what retirement health benefits you might still have. Retiree health coverage isn’t the same as active employer coverage in Medicare’s eyes, even when it’s provided by a former employer and even when it looks similar to what you had while working.

Can I Just Keep My ACA Marketplace Plan Instead of Enrolling in Medicare?

Technically, yes, you can keep an ACA plan at 65 — but it’s rarely the financially sound choice. Once you’re eligible for Medicare, you lose access to ACA premium tax credits and cost-sharing reductions, which means your ACA plan’s real cost goes up substantially exactly when Medicare becomes available as a typically more cost-effective alternative. For most people in this situation, transitioning to Medicare at eligibility, rather than staying on an ACA plan, is the more financially sound path.

Should I Compare My Employer Plan’s Cost to Medicare Before Deciding to Delay?

Yes, even if you’re eligible to delay without penalty. Just because you can delay Medicare doesn’t automatically mean staying on your employer’s group plan is the better financial choice. Compare the two directly: premiums, deductibles, coinsurance, and annual out-of-pocket maximums on both sides. Depending on your employer plan’s specific cost structure, Medicare — potentially paired with a Medigap Supplement — can sometimes work out to be the more cost-effective option even while you’re still eligible to stay on your group plan.

How Does Medicare Coordinate With My Employer Coverage If I Enroll in Both?

If you do enroll in Medicare while keeping active employer coverage, Medicare generally acts as your secondary insurer, with your employer plan paying first, until you retire or lose that employer coverage — whichever happens first. At that point, Medicare becomes your primary coverage automatically.

What Else Should I Know Before Making This Decision?

A few points that apply regardless of which path you choose:

• Enrolling in any part of Medicare ends HSA contribution eligibility — including premium-free Part A alone, which can seem like an easy “why not” enrollment but has this real trade-off attached.
• Medicare doesn’t cover your spouse or children. If you enroll in Medicare and drop employer coverage, you’ll need a separate plan for family members who were covered under that policy — talk to your employer’s benefits administrator about COBRA or other options before making the switch.

Bottom Line

Working past 65 genuinely does give you options, but several of the details — COBRA not counting as active coverage, both-spouses-retired triggering mandatory enrollment, ACA plans losing their subsidies at Medicare eligibility — are easy to get wrong and expensive to get wrong permanently. Comparing your actual employer plan costs against Medicare, rather than assuming delay is automatically the better choice, and confirming your specific situation against these common pitfalls before you decide, is what actually protects you from a late enrollment penalty or an avoidably expensive coverage gap.

Key Takeaways

• COBRA continuation coverage does not count as active employer coverage for Medicare enrollment purposes, even though it continues your former employer’s plan.
• If both you and your spouse are retired, you generally need to enroll in Medicare Part B, even with a retirement package, since retiree coverage isn’t active employer coverage.
• Keeping an ACA marketplace plan past 65 means losing premium tax credits and cost-sharing reductions, usually making it the less cost-effective choice compared to Medicare.
• Even if you’re eligible to delay Medicare, comparing your actual employer plan costs against Medicare directly is worth doing rather than assuming delay is automatically better.
• Enrolling in any part of Medicare, including premium-free Part A, ends your HSA contribution eligibility.
• Medicare doesn’t cover spouses or children, so dropping employer coverage requires a separate plan for family members.

FAQ – Working Past 65

Does COBRA count as creditable coverage for delaying Medicare?
No. COBRA is not considered active employer coverage, so relying on it to delay Medicare enrollment without penalty is a common and costly mistake.

Do I have to enroll in Medicare if both my spouse and I are retired?
Generally yes. Without active employer coverage from either of you, retiree benefits don’t exempt you from Medicare’s enrollment requirements the way active coverage does.

Can I keep my ACA plan after turning 65 instead of enrolling in Medicare?
Technically yes, but you’ll lose ACA premium tax credits and cost-sharing reductions, which usually makes Medicare the more cost-effective choice.

Should I compare costs before deciding to delay Medicare while working?
Yes. Being eligible to delay doesn’t mean it’s automatically the cheaper option — compare your employer plan’s premiums, deductibles, and out-of-pocket maximum directly against Medicare’s costs.

Does enrolling in Medicare affect my HSA?
Yes. Enrolling in any part of Medicare, including Part A alone, ends your eligibility to contribute to a Health Savings Account.

Does Medicare cover my spouse if I enroll while still working?
No. Medicare only covers you individually — your spouse and any dependents need separate coverage if you drop your employer plan.