Irmaa Brackets 2025 Married Filing Jointly Calculator. For married couples filing jointly, the irmaa threshold is higher than for single filers. Monthly part b premium $ 0.

The irmaa surcharge is calculated on a sliding scale with five income brackets topping out at $500,000 and $750,000 for individual and joint filing, respectively. For 2025, you’ll find several distinct income brackets that determine your irmaa surcharge.