If you’re still working at 65 and covered through your employer’s health plan, one question will likely come up quickly: do you need to enroll in Medicare right now? Understanding when and whether to delay Medicare Part B working is one of the most important decisions you will face as you approach Medicare age — and getting it wrong can mean paying a permanent financial penalty for the rest of your life.
The short answer is that you may have more flexibility than you think. But the rules are specific, and a few small details can make the difference between a smart delay and a costly mistake. Let’s walk through what you need to know.
What Is Medicare Part B and Why Does Timing Matter?
Medicare Part B is the portion of Original Medicare that covers outpatient services: doctor visits, preventive screenings, lab work, physical therapy, and durable medical equipment. In 2026, the standard Part B premium is $185 per month.
Most people become eligible for Medicare when they turn 65. Your Initial Enrollment Period (IEP) is a seven-month window — starting three months before your birthday month, the month you turn 65, and three months after. If you don’t enroll during this window and don’t have a qualifying reason to delay, you could face a permanent late enrollment penalty.
But if you’re still working and have health insurance through your employer, you may qualify to delay Part B without any penalty at all. The key is understanding the rules before you make a decision.
Working Past 65 and Medicare: The Rule That Changes Everything
The most important factor in deciding whether to delay Medicare Part B when you’re still working is the size of your employer’s workforce. This is a rule that surprises many people.
If your employer has 20 or more employees, your group health plan is the primary payer — it pays your medical claims first, and Medicare would pay second. In this situation, you are generally safe to delay Part B while you remain employed and covered. You’re not paying double for coverage you don’t yet need.
If your employer has fewer than 20 employees, Medicare becomes the primary payer by law — even if you haven’t enrolled. Your employer’s plan then pays second, and may refuse to pay for services that Medicare should have covered first. If you aren’t enrolled in Part B, you could end up with significant unexpected bills.
The bottom line for working past 65 on Medicare: check your employer’s size before deciding anything else.
Can You Delay Medicare Part B Working Without a Penalty?
Yes — but only under specific conditions. To delay Medicare Part B working without triggering the late enrollment penalty, your coverage must come from active employment at a company with 20 or more employees. Not retired. Not COBRA. Not retiree insurance from a former employer. Active employment.
COBRA is continuation coverage designed to bridge a gap after you leave a job — it is not considered qualifying current employer coverage for Medicare purposes. If you’re relying on COBRA when you turn 65, Medicare should generally be your primary insurance, and you should enroll in Part B during your Initial Enrollment Period.
Retiree health insurance falls into the same category. Even if your former employer generously provides health coverage in retirement, that coverage does not allow you to delay Medicare Part B without penalty. Once you are eligible for Medicare, Medicare is expected to be your primary insurer.
Understanding the Medicare Part B Late Enrollment Penalty
The Medicare Part B late enrollment penalty is one of the most frustrating surprises seniors face — because it is permanent. For every 12-month period you were eligible for Part B but did not enroll, your monthly premium increases by 10%.
With the 2026 Part B premium at $185 per month, a two-year delay without qualifying coverage would mean a permanent 20% surcharge — adding $37 to every monthly bill for the rest of your life. A three-year delay without coverage would add $55.50 per month, permanently.
The penalty does not go away when you switch plans or turn a certain age. The only way to avoid it is to have had creditable coverage from a qualifying employer plan during the entire period of delay, or to have enrolled on time during your Initial Enrollment Period.
The Special Enrollment Period: Your Safety Net When Coverage Ends
Here is where people who have been doing everything right get their protection. When you retire or your employer health coverage ends — whichever comes first — you qualify for a Special Enrollment Period (SEP) for Medicare Part B.
Your SEP lasts 8 months from the day your employment-based coverage ends. During this window, you can enroll in Part B without any late penalty, no matter how long you had been delaying.
Key points to remember about the SEP:
- Your SEP begins when your employer group health coverage ends, not necessarily when your employment ends
- You have 8 months to enroll — but do not wait until the last month
- Enrolling during the SEP fully protects you from the late enrollment penalty
- Medicare enrollment can take 4 to 6 weeks to process — plan accordingly to avoid a coverage gap
- The SEP only applies to current employment-based coverage, not COBRA or retiree plans
What to Do Before You Retire
If you are approaching retirement and planning to delay Medicare Part B while you keep working, take a few steps now so you are fully prepared when the time comes.
First, confirm your employer’s plan qualifies. Ask your HR department whether your group health plan has 20 or more covered employees and whether it is considered creditable coverage for Medicare purposes. Getting this confirmation in writing is a smart idea.
Second, track your coverage end date carefully. Your SEP clock starts ticking when coverage ends, so know the exact date your employer plan terminates and plan your Medicare enrollment accordingly.
Third, consider Medicare Part A even if you delay Part B. Part A (hospital insurance) is free for most people who have worked and paid Medicare taxes for at least 10 years. The main exception is if you are still actively contributing to a Health Savings Account (HSA) — enrolling in any part of Medicare, including Part A, makes you ineligible to make new HSA contributions. Talk to a licensed advisor before making that call.
Get Help from The Benefit Link
Deciding whether to delay Medicare Part B working is not something you should figure out through trial and error. One misstep can mean a permanent surcharge added to every Part B premium you ever pay — sometimes for 20 or 30 years.
At The Benefit Link, we have been helping Texas seniors navigate Medicare since 2007. Our licensed agents provide personalized, one-on-one guidance at no cost to you — we are compensated by the insurance carriers, never by our clients. Whether you are still working at 65, planning to retire soon, or trying to understand a decision you may have made in the past, we are here to help you get it right.
Call us today at 817-539-0626 or visit our contact page to speak with a licensed Medicare agent who can walk through your specific situation.
