67-Year-Old Who Stayed on COBRA Discovers Medicare Premium Is Now Higher for Life

A man retires at 65 with a comfortable nest egg, keeps his employer health plan through COBRA because the coverage is familiar and generous, and lets the 18 months run out. He then applies for Medicare Part B and receives a letter showing a premium noticeably higher than the standard rate, along with a note that the surcharge stays on his bill for life.

This is the Part B late-enrollment penalty. It is separate from IRMAA, it stacks on top of IRMAA, and unlike almost every other Medicare cost, it is permanent.

Why COBRA Is the Villain Here

Only health insurance tied to active, current employment qualifies to delay Part B without penalty. COBRA is continuation coverage from a job you no longer hold, so Medicare does not treat it as creditable for Part B purposes. Retiree coverage and severance-linked health benefits fall into the same bucket. They may feel like employer coverage, but they do not protect the enrollment window.

The Special Enrollment Period is an 8-month clock that starts the month employment ends or employer group coverage ends, whichever comes first. Electing COBRA does not pause it. Miss that window and you wait for the General Enrollment Period, sit through a coverage gap, and then start paying the penalty.

The Part B penalty is 10% of the standard premium for each full 12-month period you could have had Part B but did not. The standard 2026 Part B premium is $202.90 a month, up from $185 in 2025, a jump of nearly 10%. A one-year delay adds roughly $20 to that monthly bill. A two-year delay adds roughly $40. The surcharge is recalculated each year as the standard premium rises, so it compounds over time.

For the 67-year-old in this example, an 18-month delay rounds down to one full 12-month penalty period, adding roughly $20 a month on today’s premium. Over a 20-plus year retirement, with the base premium climbing each year, the cumulative cost runs into the thousands. The penalty also stacks on top of any IRMAA surcharge his income triggers. For higher earners in 2026, IRMAA-adjusted Part B premiums range from $284.10 to $689.90 a month, and the late-enrollment penalty rides on top of whichever tier applies.

The 2027 Social Security COLA is currently tracking at 3.5% to 3.6%, based on projections from the Senior Citizens League, AARP, and independent analyst Mary Johnson, with the final number to be announced in October 2026. The 2026 COLA came in at 2.8%, while Part B premiums jumped by nearly 10% going into that same year. Medicare inflation is outrunning the benefit checks that pay for it, which is precisely what makes a permanent surcharge sting more with each passing year.

Drug coverage carries its own penalty. If you go 63 or more days without Part D or other creditable drug coverage after becoming eligible, Medicare adds 1% of the national base beneficiary premium ($38.99 in 2026) for each month you were uncovered. That penalty is also permanent and recalculated each year as the base premium changes. COBRA drug coverage is often creditable, but not always. Plans are required to send a Notice of Creditable Coverage each year. Keep those letters.

Who Can Actually Delay Part B Safely

People still working past 65 with true active-employment group coverage at an employer with 20 or more employees can delay Part B enrollment. When they retire, the 8-month Special Enrollment Period begins, and they can enroll without penalty.

A few wrinkles catch people off guard:

1. Small employers. At companies with fewer than 20 employees, Medicare typically becomes the primary payer at 65.
2. Self-employment. There is no employer plan protecting you. Enroll at 65.
3. COBRA and retiree plans. Not creditable for Part B.
4. Part A. Premium-free for roughly 99% of beneficiaries, so there is rarely a reason to delay it. Enroll at 65 unless you are actively contributing to an HSA.

If You Are Already Late

Enroll at the next General Enrollment Period, which runs January 1 through March 31, with coverage starting the month after you sign up. Then ask about equitable relief. If a federal employee, employer, or plan administrator gave you incorrect information about when to enroll, Social Security can waive or reduce the penalty. Put the request in writing, attach any documentation you have, and be specific about who told you what and when.

Two Things to Do This Week

First, if you are approaching 65 and considering COBRA, severance health coverage, or a retiree plan as your bridge to Medicare, enroll in Part B anyway. The premium is real money, but a permanent surcharge costs more over a long retirement. Second, if you have already missed the window, do not wait for a penalty letter to arrive. File for the next General Enrollment Period and start the equitable relief conversation if the facts support it.

Editor’s note: This article has been updated to reflect the confirmed 2026 standard Medicare Part B premium of $202.90 per month (corrected from $203), the 2026 Part D national base beneficiary premium of $38.99, the confirmed 2026 IRMAA-adjusted Part B range of $284.10 to $689.90, and the latest 2027 Social Security COLA projections of 3.5% to 3.6% from the Senior Citizens League, AARP, and independent analyst Mary Johnson, replacing the earlier estimate of 3.1%.

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