Education

First I was not aware that my son turning 24 makes him not a dependent on my taxes.  So for 2025, we used the 529 to pay for his last semester of college, had it deposited into my bank account, and paid the college bills.  I guess that 529 withdrawl and the corresponding college expenses will have to go on his taxes  However, he was on our ACA medical.  I paid his medical on our ACA bill.  I am hoping I can put his "portion" of the medical paid on his taxes.  The bill breaks out the cost for each person.  He makes good money, so he is above the poverty line.  (FYI Healthcare.gov  let me put him on my medical plan - I assumed he had to be a dependent.  So that is why I am annoyed.  I am stressing about how to enter all of this into TurboTax. ) ALSO I paid additional estimated 2025 taxes bc of my son's income.  If he was a dependent, his income is added to my income for the Premium Tax Credit - and I wanted to avoid a tax penalty.  Oh he still lives with us.)  So I just want to know how 529 withdrawls and the ACA medical are handled when I thought they were going to be on my taxes but now may have to be on my son's.  (Also when we added him to our medical Fall 2024 - he had no job offers and thought about doing a gap year.  Then gets a job and now I have a tax dilemma!)