Level 1
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After you file

 
Alumni
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After you file

MAGI for what specific purpose? There are different requirements for different purposes.
Level 1
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After you file

To determine if I will go into a higher bracket on my Social Security medical premiums.
Alumni
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After you file

Turbotax does not calculate that for you, you have to calculate it. It is your adjusted gross income (Line 37, Form 1040) plus your tax-exempt interest income, Line 8b, Form 1040.

See:
https://www.ssa.gov/pubs/EN-05-10536.pdf