Missing your Medicare enrollment window triggers a late enrollment penalty that gets added to your monthly premium permanently. Not for a year. Not for five years. For as long as you have Medicare.
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10% per year, compounded on every monthly premium bill.
penalty added to your Part B premium for each full 12-month period you delayed enrollment
Medicare.gov, 2026
2026 standard Part B premium before penalties; a 2-year delay adds $37/month on top of this
CMS, 2026
the extra cost over 10 years from a 2-year enrollment delay (20% penalty on $185/month)
Calculated from CMS rates
The Part B penalty is calculated as 10% of the standard premium multiplied by the number of full 12-month periods you were eligible but did not enroll. The standard Part B premium for 2026 is $185.00 per month. Here is what different delays cost:
| Delay | Penalty rate | Monthly surcharge | Extra cost per year |
|---|---|---|---|
| 1 year | 10% | $18.50 | $222 |
| 2 years | 20% | $37.00 | $444 |
| 3 years | 30% | $55.50 | $666 |
| 5 years | 50% | $92.50 | $1,110 |
These surcharges recalculate each year as the standard premium changes. The percentage stays the same, but the dollar amount increases as premiums rise. A 30% penalty today costs more next year if premiums go up.
If you go 63 or more consecutive days without creditable drug coverage after your initial enrollment window, you face a Part D late enrollment penalty. The calculation is 1% of the national base beneficiary premium (about $34.70 in 2026) for each full month you went without coverage. A 2-year gap adds roughly $8.33 per month to your Part D premium, permanently.
Part D penalties are smaller than Part B penalties in dollar terms, but they stack. If you missed both enrollment windows, you pay both penalties on top of your regular premiums every month for the rest of your time on Medicare.
If you miss your Initial Enrollment Period, the next chance to enroll is the General Enrollment Period (January 1 through March 31), and coverage does not start until July 1. That means you could have a gap of several months with no Medicare coverage at all. During that gap, you are responsible for 100% of any medical bills.
One hospital visit during a coverage gap can cost tens of thousands of dollars. The average cost of a 3-day hospital stay in the US is over $30,000 (KFF Hospital Costs, 2024). The penalty surcharge is expensive. The coverage gap can be catastrophic.
You are exempt from the Part B late enrollment penalty if you had health coverage through a current employer (your own or your spouse's active employment) during the period you did not enroll. When that employer coverage ends, you get an 8-month Special Enrollment Period to sign up without penalty.
Important: COBRA coverage does not count. Neither does retiree health coverage. These are not considered coverage through "current employment" under Medicare rules. If you retired at 63 and kept retiree health benefits, you still need to enroll in Part B during your IEP at 65 to avoid the penalty.
Already on Medicare and want to make sure you do not miss the next deadline? Set a Medicare enrollment reminder for early October so you review your plan before Open Enrollment closes.
The penalty is 10% of the standard Part B premium for each full 12-month period you were eligible but did not enroll. If you delayed 3 years, the penalty is 30% of the standard premium, added to every monthly bill for as long as you have Part B.
The Part B late enrollment penalty lasts for as long as you have Medicare Part B. It does not expire after a set number of years. This is a permanent surcharge added to your monthly premium.
In most cases, you cannot remove the Part B late enrollment penalty once it applies. The main exception is if you qualified for a Special Enrollment Period that was not properly applied. Contact Social Security at 1-800-772-1213 to check if an error was made in your case.
If you are not covered by an employer plan (through your own or a spouse's current employment), delaying past your Initial Enrollment Period means you wait for the General Enrollment Period (January through March), coverage does not start until July 1, and you face a permanent Part B penalty.
Yes. The Part D late enrollment penalty is 1% of the national base beneficiary premium (about $0.35/month in 2026) for each full month you were eligible but did not have creditable drug coverage. Like Part B, this penalty is permanent.
You are exempt if you had creditable coverage through a current employer (yours or your spouse's) during the period you did not enroll. You must enroll within 8 months of losing that employer coverage to avoid the penalty. COBRA and retiree coverage do not count as current employer coverage.
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