Medicare late-enrollment penalties
A late-enrollment penalty may apply if you delay coverage without a qualifying exception. Confirm current premium amounts on Medicare.gov. This tool illustrates the official percent formulas.
You can use this tool without providing your name or phone number. Your results will appear below.
Before you start, check current Medicare premium amounts and use amounts for the same year.
How this tool works and official sources
Part B: 10% of the standard premium for each full 12-month period. Part D: 1% of the national base beneficiary premium per month without creditable coverage. Both typically last as long as you have that coverage.