I had read the EN-05-10536.pdf several times, but given the prior answer in this forum and similar ambiguous references found elsewhere, and the fact that I'll be coming close to the IRMAA limit, I was hoping for an unequivocal statement that the non-taxable portion of SS benefits were not included in the MAGI for IRMAA determination purposes. It appears I'm not going to find that, and I do agree that the statement "Your MAGI is your total adjusted gross income and tax-exempt interest income." implies that only the taxable portion already in the AGI is included. I guess I'll go with that. Thanks very much.
