Irmaa Brackets 2025 Table 2025. The irmaa for part b and part d is calculated according to your income. — while your agi will be locked in on dec 31, 2023, only 4 of the 12 inflation numbers that 'lock in' the 2025 irmaa brackets will be known.
— key points about irmaa: This website has estimated 2025 tax brackets among a number of other estimates for 2025.