In the turbo tax Roth IRA worksheet, it appears the wrong AGI amount is being used to calculate my MAGI. My AGI includes a deduction for self employed health insurance I paid. Turbo tax in adding this back to my AGI for my MAGI. I have reviewed IRS Form 590A, and it does not state that should be added back for my MAGI calculation (I used the IRS worksheet for Roth IRA contributions in the instructions). Where is the documentation stating that the value in Schedule 1, Part 2, Line 17 has to be added back to my AGI to get my MAGI for Roth contributions?