2025 Medicare Part B Irmaa Premium Brackets. Medicare part b premiums are designed to cover 25% of program costs, with the remainder funded by taxpayers. The 2025 medicare part b and medicare part d irmaa brackets comparing the five income brackets with 2024.
The usual half b premium is $174.70/month in 2024. Irmaa is a fee that may be added to your medicare part b and part d premiums if your yearly income exceeds a certain amount.