For IRMAA (Income Related Monthly Adjustment Amount) Medicare Part B and D Prescription Drug Coverage Premiums, there are sliding scale tables

The (IRMAA) sliding scale is a set of statutory percentage-based tables used to adjust Medicare Part B and Part D prescription drug coverage premiums. The higher the beneficiary’s range of modified adjusted gross income (MAGI), the higher the IRMAA. There are three sets of tables. Use the beneficiary’s tax filing status when using the table. For more information go to: https://welchinsurance.net/irmaa/