Medicare Part B Late Enrollment Penalty Calculator

The Part B penalty is 10% of the standard Part B premium for each full 12-month period you could have had Part B but didn’t enroll and didn’t have creditable coverage. It’s usually added for as long as you have Part B.

Months without Part B & without creditable coverage

Only periods with no Part B and no creditable coverage count. Partial years are rounded down.

Results

Formula: Penalty = full 12-month periods × 10% × standard Part B premium (fixed here at $185). The penalty is added to your Part B premium and generally lasts as long as you have Part B.