Medicare Late Enrollment Penalty
May 20, 2026
Quick Answer: Medicare Late-Enrollment Penalties
Missing your Initial Enrollment Period without other qualifying coverage can trigger permanent penalties. Part B adds 10% to your premium for every full 12 months you delayed, and Part D adds roughly 1% of the national base premium per month without creditable drug coverage — added to your premium for as long as you have Medicare.
Penalty questions to answer before you delay
- Does an employer plan protect me from penalties?
- Generally yes, if it's a group plan from an employer with 20+ employees and counts as creditable coverage. COBRA and retiree plans usually do not protect you. Get it in writing.
- Is the Part B penalty ever waived?
- Rarely. CMS may waive in limited cases (bad SSA advice, emergencies). Otherwise the penalty is permanent.
- How is the Part D penalty calculated?
- Roughly 1% of the national base beneficiary premium per uncovered month, rounded and added to whichever Part D plan you eventually choose. Exact dollar amounts vary year to year.
- What about Part A?
- If you have to buy Part A (didn't earn 40 quarters), the penalty is 10% added for twice the number of years you delayed. Premium-free Part A has no penalty.
- Can I avoid penalties if I retire later than 65?
- Yes — qualifying employer coverage triggers an 8-month Special Enrollment Period after work or coverage ends. Enroll within that window to stay penalty-free.
Medicare late enrollment penalty, explained
The Part B and Part D penalties are permanent. Here is when they trigger and the simplest ways to avoid them.
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Part B late penalty
If you do not sign up for Part B when you are first eligible, and you do not have other "creditable" coverage (like an employer plan that meets the requirement), you can be charged a 10% premium increase for every 12 months you went without it — for as long as you have Part B.
That is permanent. There is no expiration.
Our Turning 65 timeline shows when to enroll. If you have employer coverage past 65, see "creditable coverage" below.
Part D late penalty
If you go more than 63 days without "creditable" drug coverage after you are first eligible for Part D, you pay a 1% of the national base premium for every month you went without it — added to your Part D premium for life.
It applies even if you take no medications today. See our prescription coverage guide.
What "creditable coverage" means
Coverage that is at least as good as Medicare standard. Examples that usually count:
- Employer group health plan (verify with the plan administrator)
- VA health benefits
- TRICARE
- Federal Employee Health Benefits (FEHB)
Always get the "Notice of Creditable Coverage" letter from your current insurer in writing. Keep it for life.
Related guides
More plain-language guides from Senior Plan Path.