I am in the same situation. When I tell TurboTax about my adult child, I am asked for their SSN, dates of coverage, and I can select 100% for all amounts.
BUT - nowhere am I asked to include my child's MAGI. This has an effect on the overall subsidies, surely.
If she were a dependent, I would be asked for her MAGI, and it would be added to the total income to calculate subsidies.
I am puzzled about how to account for my child's income in this part of my return.
