Advice needed on resolving now estranged dependent adult college student who intentionally claimed himself and filed prior to us filing and claiming him as a dependent?
In 2018, my 20 year old son was attending full-time college and only worked part-time in the summer. His living expenses were paid from a combination of my cash contributions, his part-time work, his financial aid, and money withdrawn out of a 529 account. I paid for all of his insurance (and he was listed as a dependent on our Marketplace application and we received advanced premium tax credits based on that status) and medical expenses. Since last year, he has decided to cut off most contact with us, except for one email he sent stating we would not be able to claim him as a dependent for 2018. He said he provided more than half his support and earned more than $4,150. I dispute that completely as I have records of how much his expenses were and how much we provided. I am also aware his income doesn't matter even if it exceeds $4150 because of his full-time student status and our level of support. We are at a stalemate right now. 1. He is refusing to cooperate and provide more information. 2. He said he already filed and told his tax adviser said our return would be rejected if we tried to claim him as a dependent. FIRST QUESTION: Since personal exemptions are gone- is this even really a concern anymore?
SECOND QUESTION: can we file and claim him as a dependent, and if we do, will it actually be rejected and if so, then what happens? If not rejected, what will happen next? THIRD QUESTION: Since he as on our Marketplace application as a dependent, we received APTC. Now if I file without him being a dependent, how can I reconcile the APTC if he is not our tax dependent? My understanding is there needs to be an agreement between both parties on how to split the APTC and premium responsibility. He is ignoring our requests and not responding. How do we come to an agreed amount? Should I just claim 100% of premium and APTC on my return? (Again this is assuming I file without claiming him as a dependent). ALSO, I am thinking his filing is incomplete since I did not provide to him a 1095a for the Marketplace APTC (and he would not have access to it since I am the primary). Will he get notice from the IRS to ask for a Form 8962 in follow-up?