Kat, the MAGI you originally provided is for ACA purposes. MAGI for Medicare Part B and Part D IRMAA purposes is simply AGI plus tax-exempt interest income, 2018 Form 1040 line 7 plus line 2a.
Kat
Level 15
Oct 8, 2019 5:03:36 PM
@dmertz , Thanks! I didn't realize that there were different methods.