2024 Medicare Irmaa Brackets Chart. Irmaa is adjusted for inflation each year, so you could be in luck if you were slightly over one. The irmaa for part b and part d is calculated according to your income.
The people moving to a lower bracket could see a decrease of about $12 to $19 in their irmaa payments (see comparison chart below). The irmaa is calculated on a sliding scale with five income brackets topping out at $500,000 and $750,000 for individual and joint filing, respectively.