@gwalls2002 nothing in the OBBB will impact how IRMAA is calculated.
None of the changes are going to affect Line 11 (AGI) which determines IRMAA.
All the changes (Senior deduction, overtime, tips, car loan interest) will be subtracted from the current Line 11 (AGI) and result in a lower current line 14 (taxable income)
Not sure how you could get 'tripped up' by the new tax bill - it lowers or maintains taxes; it shouldn't increase them.
this is an excellent website related to IRMAA:
https://thefinancebuff.com/medicare-irmaa-income-brackets.html
