2025 Irmaa Brackets For Medicare Part B And D Plans.  — understanding the 2025 irmaa brackets:  — the following table shows the income brackets and irmaa amount you’ll pay for part b and part d in 2025 (based on your 2022 tax return):

Here’s a chart explaining how income affects the part b premium and part d irmaa. For 2025, the income brackets for part b and part d are the same.