COBRA vs Medicare: Which Should You Choose When Leaving Your Job? (2026) | Eligry

Medicare Enrollment · Updated May 2026 · 11 min read

If you are leaving your job — whether you are retiring, got laid off, or your employer is ending your coverage — one of the first questions you will face is whether to keep COBRA or switch to Medicare.

It sounds like a straightforward decision. It is not. The rules around COBRA and Medicare are some of the most misunderstood in all of health insurance, and getting them wrong can cost you a permanent penalty you will pay every month for the rest of your life.

I have helped hundreds of clients navigate this exact decision. Many of them come to me after getting bad advice from an HR department that told them to “just keep COBRA.” Some come after discovering they missed an enrollment window they did not know existed. A few come after learning they now owe a lifetime surcharge that could have been avoided with a single phone call.

This guide explains the rules clearly, with the actual 2026 numbers, so you can make an informed decision before the clock runs out.

Does COBRA count as creditable coverage for Medicare?

No. COBRA is not considered creditable coverage for Medicare Part B. Your 8-month Special Enrollment Period to sign up for Part B begins when your active employment ends or when your employer-sponsored group health plan ends — whichever comes first. It does not restart or extend when COBRA expires. If you wait until COBRA runs out to enroll in Medicare, you will almost certainly face a permanent late enrollment penalty.

This is the single most important fact in the entire COBRA-versus-Medicare decision, and it is the one that catches the most people off guard.

Here is why the confusion happens: COBRA coverage often looks and feels identical to the employer plan you had while working. Same card, same network, same benefits. Your HR department may even tell you that you are “covered” and do not need to worry about Medicare yet. But Medicare does not care what your COBRA plan covers. Medicare cares whether you are in an active employer group health plan based on current employment. Once you stop working, COBRA is no longer active employer coverage in Medicare’s eyes — even though the benefits continue.

How long do I have to enroll in Medicare after leaving my job?

You have an 8-month Special Enrollment Period (SEP) to sign up for Medicare Part B without a penalty. This window begins the month after your employment ends or the month after your group health coverage ends — whichever happens first. It does not begin when COBRA expires. Whether your COBRA lasts 18 months or 36 months, your Medicare enrollment clock started ticking the day you stopped actively working.

Here is the timeline in plain terms:

Event	What it triggers	Deadline
You stop working	Your 8-month Part B SEP begins	8 months from the month after employment ends
You elect COBRA	Nothing changes for Medicare — the SEP clock keeps running	Same 8-month window applies
COBRA expires	Does NOT trigger a new SEP	If your 8-month window has passed, you must wait for the General Enrollment Period (Jan 1 – Mar 31)
You miss both windows	Permanent late enrollment penalty begins	Penalty applies for as long as you have Part B

This is not a one-time late fee. The Part B late enrollment penalty is a permanent surcharge added to your monthly premium for as long as you are enrolled in Medicare. Most people are enrolled in Part B for life, which means this penalty compounds into thousands of dollars over a typical retirement.

How much is the Medicare Part B late enrollment penalty?

The penalty is 10% of the standard Part B premium for every full 12-month period you were eligible but did not enroll. In 2026, the standard Part B premium is $202.90 per month. If you delayed enrollment by two years, you would pay an additional $40.58 per month — every month, permanently. Over a 20-year retirement, that two-year mistake costs roughly $9,739 in extra premiums alone.

Here is what the penalty looks like at different delay periods:

Delay	Penalty	Monthly premium in 2026	Extra cost over 20 years
No delay	0%	$202.90	$0
1 year	10%	$223.19	~$4,870
2 years	20%	$243.48	~$9,739
3 years	30%	$263.77	~$14,609

And remember: the standard premium goes up every year, and the penalty percentage is applied to whatever the current premium is. So the dollar amount of the surcharge increases every year too, even though the percentage stays the same.

You will also face a coverage gap. If you miss the SEP, you cannot enroll until the next General Enrollment Period (January 1 through March 31), and your coverage will not start until July 1 of that year. That gap leaves you without Medicare coverage for months — and COBRA may have already expired by then.

How does COBRA compare to Medicare in cost?

For most people 65 and older, Medicare is significantly less expensive than COBRA. The average monthly COBRA premium in 2026 is between $700 and $900 for individual coverage because you are paying the full cost of your former employer’s group plan plus a 2% administrative fee. By comparison, Medicare Part B costs $202.90 per month, and adding a Medigap Plan G typically runs $100 to $250 per month depending on your state and age.

Here is a side-by-side comparison:

	COBRA	Medicare + Medigap Plan G
Monthly premium	$700-$900+ (you pay full cost + 2%)	$303-$453 (Part B $202.90 + Plan G $100-$250)
Annual premium	$8,400-$10,800+	$3,636-$5,436
Out-of-pocket risk	Varies by plan (copays, deductibles, coinsurance)	$283/year (Part B deductible only)
Duration	18 months max (36 for some qualifying events)	Lifetime
Provider access	Same employer plan network	Any doctor nationwide that accepts Medicare
What happens when it ends	Coverage stops. If you missed your Medicare SEP, you face a penalty and coverage gap.	Continues for life. No gap risk.

There are situations where keeping COBRA briefly makes sense — for example, if you are in the middle of treatment with an in-network provider and want continuity of care for a few weeks while Medicare processes your enrollment. But in almost every case, enrolling in Medicare Part B within your SEP window should be your first priority, even if you also keep COBRA temporarily as secondary coverage.

Run your own numbers: 15-year cost calculator →

What if you had COBRA before turning 65?

If you elected COBRA before becoming Medicare-eligible and then turn 65, you must enroll in Medicare during your Initial Enrollment Period — the 7-month window surrounding your 65th birthday. Once you are entitled to Medicare, COBRA typically stops being your primary insurance. If you do not enroll in Medicare on time, COBRA may stop paying primary on your claims, leaving you responsible for bills you assumed were covered.

This scenario is common for people who lose their job at 63 or 64, elect COBRA to bridge the gap until Medicare, and then assume COBRA will keep working normally after they turn 65. It will not. Once you are Medicare-eligible, the coordination of benefits changes. Medicare becomes primary, and COBRA becomes secondary — or in many cases, COBRA terminates entirely once you enroll in Medicare Part A.

The key dates to know:

• Your Initial Enrollment Period (IEP) starts 3 months before your 65th birthday month and ends 3 months after
• You should enroll in both Part A and Part B during this window
• If you are already receiving Social Security, Part A may start automatically, but Part B requires active enrollment
• Do not assume your COBRA will continue to pay primary after age 65 — verify with your plan administrator

Full guide: Medicare Initial Enrollment Period explained →

Do I need Medicare Part D if I have COBRA drug coverage?

It depends on whether your COBRA plan’s drug coverage is considered “creditable” — meaning it is at least as comprehensive as a standard Medicare Part D plan. Your former employer is required to send you a notice by October 15 each year confirming whether the plan’s drug coverage is creditable. If it is, you can delay Part D without penalty for as long as the COBRA drug coverage lasts. If it is not, you have 63 days after losing your employer coverage to enroll in a Part D plan without facing a lifetime penalty.

Important: the Part D enrollment deadline is shorter than the Part B deadline. You have 8 months for Part B, but only 63 days for Part D if your coverage is not creditable. These are two different clocks running at the same time, and missing either one results in a separate permanent penalty.

The Part D late enrollment penalty in 2026 is calculated at 1% of the national base beneficiary premium ($38.99) for every month you went without creditable coverage. That works out to about $0.39 per uncovered month, added to your Part D premium permanently. A 24-month gap adds roughly $9.36 per month for life.

Medicare Part D explained: what it covers and what it costs →

What happens to my spouse’s COBRA coverage when I enroll in Medicare?

If you enroll in Medicare and your spouse is under 65, your spouse can generally keep COBRA coverage for up to 36 months from the original qualifying event. Your enrollment in Medicare is considered a second qualifying event that extends your spouse’s COBRA eligibility beyond the standard 18 months. This is a federal protection under the COBRA statute.

However, there are several things to watch out for:

• Your spouse’s COBRA coverage and your Medicare enrollment are on completely separate timelines — do not mix them up
• If your spouse turns 65 while on COBRA, the same rules apply to them: COBRA is not creditable for Part B, and they must enroll within their own enrollment window
• If your spouse is under 65 and will not be Medicare-eligible for several years, COBRA may not last long enough to bridge the entire gap — explore ACA marketplace plans as an alternative once COBRA expires

This is one of the more complicated scenarios I help clients navigate, because the timing affects two people’s coverage simultaneously. If you are in this situation, it is worth a conversation before making any decisions.

Four common scenarios and what to do

Scenario 1: You are turning 65 and retiring at the same time

Enroll in Medicare Part A and Part B during your Initial Enrollment Period. You do not need COBRA in most cases — Medicare plus a Supplement plan will cost less and provide broader coverage. If you want to keep COBRA for a few weeks during the transition, you can, but make Medicare your priority.

Scenario 2: You are over 65 and leaving your job now

Your employer plan was keeping you out of Medicare legitimately (assuming the employer has 20+ employees). Now that employment is ending, enroll in Part B immediately using your 8-month SEP. Do not wait for COBRA to expire. If you elect COBRA, treat it as secondary coverage only.

Scenario 3: You lost your job at 63 and have been on COBRA for a year

Your 65th birthday is approaching. Enroll in Medicare Part A and Part B during your Initial Enrollment Period. Your COBRA will likely terminate or become secondary once Medicare starts. Do not assume COBRA will keep paying primary after you turn 65.

Scenario 4: Your spouse is under 65 and relies on your employer plan

When you retire and enroll in Medicare, your spouse can continue on COBRA for up to 36 months. However, run the numbers: COBRA premiums are often $700-$900 per month, and an ACA marketplace plan with subsidies may be significantly cheaper. Your spouse’s situation is separate from your Medicare enrollment — do not delay your own enrollment to keep your spouse’s coverage.

Need help figuring out your timeline?

The COBRA-to-Medicare transition is one of the highest-stakes decisions in all of Medicare planning, because the consequences of getting it wrong are permanent and expensive. Most of the people I help with this decision are not making a mistake out of carelessness — they are making it because they got incomplete or incorrect information from someone they trusted.

If you are leaving your job, approaching 65, or currently on COBRA and unsure about your Medicare timeline, I can walk you through your specific dates, deadlines, and options quickly. There is no cost and no obligation — and I will tell you honestly if you do not need my help.

Cindy Kowalski is the founder of Eligry LLC, a licensed independent Medicare advisory firm serving clients in 22 states. She holds AHIP 2026 certification, has 23 years of experience in enterprise sales at AT&T and 16 years running an IT consulting firm, and transitioned to Medicare advising after a personal near-miss enrollment experience. She is not employed by or exclusively contracted with any insurance carrier. NPN 21601670.

We do not offer every plan available in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options. Not affiliated with or endorsed by the U.S. government or the federal Medicare program. © 2026 Eligry LLC.