Irmaa 2024 Form. To calculate your irmaa, you will need to review your tax returns submitted to the irs two years prior to the current year. Your medicare irmaa amount in 2024 is determined by your reported income in 2022.

Please refer to the infographic below to help determine if you paid irmaa for medicare part b in 2023. Your irmaa is based on the modified adjusted gross income stated on your tax form.