There are different definitions of MAGI for different purposes. I just checked this IRS webpage and it clarifies the differences, and that for purposes of the Premium Tax Credit, to calculate MAGI:
Take your AGI and add:
- Foreign earned income
- Tax-exempt interest
- Your nontaxable Social Security benefits
So, the source you cited is correct and your IRA deductions do lower your MAGI. My apologies for the confusion.
@mokbaegae
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