Delaying Medicare Part B can be a smart money move — or an expensive mistake that follows you for life. The difference comes down to one question: what kind of coverage do you have right now?
When delaying Part B is perfectly fine
You can safely put off Part B if you have active employer coverage through a job with 20 or more employees — either your own job or your spouse’s. In that case, the employer plan stays primary, Medicare lets you wait, and you won’t owe a penalty for enrolling later.
This is common for people who keep working past 65. There’s often no reason to pay the $202.90 monthly Part B premium (the 2026 standard amount) while a solid group plan is already covering your doctor visits. Most people still take premium-free Part A at 65 since it costs nothing for those with 10 years of Medicare-taxed work, but Part B can wait.
A couple of things to confirm before you delay:
- The employer truly has 20+ employees. At smaller companies, Medicare usually becomes the primary payer at 65, and the group plan pays second — which means skipping Part B can leave big gaps.
- The coverage is active, tied to current employment. The moment that changes, the clock starts.
Not sure whether your situation qualifies? The Eligibility Calculator walks you through your dates and coverage so you know where you stand.
When delaying Part B is a costly mistake
Here’s where people get burned. Several kinds of coverage feel like they should count — but they don’t.
| Coverage type | Counts for delaying Part B? |
|---|---|
| Active employer plan, 20+ employees | Yes |
| Employer plan, fewer than 20 employees | Usually no — Medicare is primary |
| COBRA | No |
| Retiree health plan | No |
| VA benefits | No |
COBRA, retiree plans, and VA benefits do not count as creditable coverage for delaying Part B. If you lean on one of these and skip Part B, two bad things can happen at once: you may end up with a gap where neither plan pays the way you expect, and you start racking up a late penalty.
This trips up a lot of newly retired folks. They leave a job, pick up COBRA to bridge the gap, and assume they’re covered. But COBRA doesn’t pause your Medicare clock — the deadline to enroll in Part B is tied to when your active employment ended, not when COBRA runs out.
The 8-month Special Enrollment Period
When your qualifying employer coverage ends, Medicare gives you a Special Enrollment Period (SEP) of 8 months to sign up for Part B with no penalty. It begins the month after your active employer coverage or your employment ends — whichever comes first.
To avoid any gap, it’s smart to enroll in Part B before the job coverage actually stops, so the new coverage starts the day you need it. Waiting the full 8 months is allowed, but it can leave you uninsured in the meantime.
If you miss the SEP entirely, you’re stuck waiting for the General Enrollment Period (January 1 – March 31), with coverage not starting until the first of the month after you sign up. That delay, plus a penalty, is exactly what we want to help you avoid.
The penalty for getting it wrong
The Part B late enrollment penalty is 10% added to your premium for each full 12 months you could have had Part B but didn’t sign up. And it isn’t a one-time fee — it sticks to your premium for as long as you have Part B.
A quick example: go three full years without enrolling when you should have, and you’re looking at a 30% surcharge on top of the standard premium — every month, for life. On a $202.90 premium, that adds up fast.
You can see what a delay might cost in your own case with the Late Enrollment Penalty Calculator. Plug in your months without coverage and it shows the lifetime impact in plain numbers.
A simple rule of thumb
If you have active employer coverage from a company with 20 or more employees, delaying Part B is usually fine. If you’re relying on COBRA, a retiree plan, VA benefits, or a small-employer plan, you should almost always take Part B on time.
The stakes are high enough that it’s worth getting a second opinion before you decide. If you’d like to talk through your specific coverage and timing, reach out for a no-pressure conversation — we’ll help you figure out whether waiting is safe or whether it’s time to enroll.