Irmaa 2025 Income Brackets. Katelyn explains the updated irmaa brackets for 2025, starting with a brief overview of how irmaa is calculated and how taxable income affects medicare costs. The higher the beneficiary’s range of modified adjusted gross income (magi), the higher the irmaa.

Here are the projected brackets and surcharge amounts for 2025: Here’s a chart explaining how income affects the part b premium and part d irmaa.