I have seen in looking at the Turbotax forum cases where a non-dependent child still gets covered under the same subsidized marketplace exchange plan as the rest of family but since a non-dependent is in separate tax household. Upon filing taxes the 1095-A form policy premium, advanced premium subsidy, etc. is distributed between the two household/tax groups on form 8962 via the use of the Allocation of Policy Amounts - Situation 4 where a policy is shared between two tax families.
As long as one of the two tax groups is eligible for premium tax credits then they can apply 100% of the allocation to that group and 0% to the second group. This would allow the child to still be on the same marketplace exchange plan as rest of family. Not sure if this would apply if non-dependent child is not eligible for PTC since affordable, workplace coverage is made available?
