11/14/2025
Enroll on time to avoid late enrollment penalties
Medicare Part B and Part D may add penalties to your premium payments if you enroll after your IEP ends and don’t qualify for a Special Enrollment Period. If you don’t qualify for premium-free Part A, you’ll also face late penalties for Part A if you miss your IEP. Each part has its own rules for timing and for calculating the penalty.
The Part B penalty is an additional 10% of the premium amount for each full 12-month period you could have had Part B and didn’t. The penalty is charged every month for as long as you have Part B.
The Part D penalty is an additional 1% of the average Part D premium for each month you delay enrollment. The penalty amount may change each year along with annual Part D premiums. It’s charged every month for as long as you’re enrolled in Part D.
The Part A penalty is an additional 10% of the premium amount and is charged every month for twice the number of years enrollment was delayed.