dmertz
Level 15

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MAGI for what purpose with regard to Marketplace plans?  There are several.  However, I don't know that any involve adding the deductible portion of SE tax to AGI.  Some calculations involve subtracting the deductible portion of SE tax from total income, not modifying AGI.

 

I suggest looking at IRS Pub 974:  https://www.irs.gov/pub/irs-pdf/p974.pdf