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Medicare Late Enrollment Penalties Explained for 2026
Last Modified: 10/05/2026 | Reviewed by Keith Armbrecht (NPN 634015)
Quick Summary
Medicare can charge late enrollment penalties for Part A, Part B and Part D when you don’t enroll when first eligible and don’t qualify for an exception.
These penalties aren’t usually one-time fees.
The Part B penalty can generally last as long as you have Part B, while a Part D penalty can generally continue for as long as you have Medicare drug coverage.
The best way to avoid penalties is to understand whether the coverage you have allows you to safely delay Medicare. (Medicare)
Key Facts
- Medicare Part A can have a penalty if you must buy Part A and enroll late.
- The Part A premium can increase 10%.
- The Part A penalty generally lasts twice the number of years enrollment was delayed.
- Part B can have a lifetime late enrollment penalty.
- Part B penalty: generally 10% for each full 12-month periodyou could have had Part B but didn’t.
- Part D can have a late enrollment penalty.
- Part D penalty generally applies after 63 days or more without creditable drug coverage.
- Part D penalty is generally 1% per full uncovered month.
- Qualifying employer coverage may protect you from a Part B penalty.
- Creditable prescription coverage may protect you from Part D penalties.
- Medicare Savings Program enrollment can affect Part B penalty rules.
- Extra Help can eliminate the Part D late enrollment penalty. (Medicare)
Part B Late Enrollment Penalty
The Part B penalty is generally:
10% for every full 12-month period you delayed
Example
Suppose you delayed Part B for 2 full years without qualifying for a Special Enrollment Period.
Your penalty could be:
20%
For 2026, Medicare provides an example using the standard $202.90 Part B premium. A 20% penalty adds about $40.60 per month, producing a premium of approximately $243.50 per month after rounding. (Medicare)
Part D Late Enrollment Penalty
You may face a Part D penalty if you go 63 consecutive days or more without Medicare drug coverage or other creditable prescription drug coverage after you’re eligible.
The penalty is based on:
1% × the national base beneficiary premium × number of full uncovered months
For 2026, the national base beneficiary premium used for the penalty calculation is:
$38.99
Because that base amount can change annually, your Part D penalty can also change. (Medicare)
Part A Late Enrollment Penalty
Most people don’t pay a monthly Part A premium.
But if you must purchase Part A and enroll late, your monthly premium may increase by 10%.
You generally pay that higher premium for twice the number of years you delayed enrollment. (Medicare)
Video Explanation from Keith
Medicare Penalties That Can Follow You for Years
Keith's Take
The most frustrating Medicare penalty is the one that could have been avoided.
The big mistake I see is someone thinking:
“I have insurance, so I don’t need Medicare.”
The real question is:
Does that insurance protect you from Medicare’s late enrollment rules?
Employer coverage based on current employment can be very different from:
COBRA
retiree insurance
or
Marketplace coverage.
Before delaying Medicare, verify the rules.
Keith Armbrecht
Medicare on Video
Frequently Asked Questions About Medicare Penalties
Q. How much is the Part B late enrollment penalty?
A. Generally 10% for every full 12-month period you could have enrolled but didn't.
Q. How long does the Part B penalty last?
A. How long does the Part B penalty last?
Q. What causes a Part D penalty?
A. Going 63 days or more without Medicare drug coverage or other creditable drug coverage after becoming eligible.
Q. What is the Part D penalty percentage?
A. Generally 1% for each full uncovered month.
Q. Does the Part D penalty go away?
A. Generally not while you continue Medicare drug coverage, although Extra Help changes the rule.
Q. Is there a Part A penalty?
A. Yes, for some people who must purchase Part A and enroll late.
Q. Can employer insurance prevent penalties?
A. Qualifying coverage based on current employment can protect you in certain circumstances.
Q. Does COBRA always protect me?
A. No.
Official Government Sources
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