Medicare Premiums 2025 Irmaa Brackets Income. — 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. Retirees will pay more for medicare part b premiums in 2025.
— this means that your medicare part b and part d premiums in 2025 may be based on your reported income in 2022. The medicare 2025 part b irmaa premium brackets change when you earn one dollar more above the line.