A parent plus loan is in the parent’s name. The student is not responsible in any way and the loan balance cannot be combined with the student’s own federal loans. You’ll have a payment on the Plus loan and he’ll have a payment on the (federal) student loans. Never the twain shall meet.
The private student loans (Sallie Mae, Discover, SoFi) can either be to the parent or to the student with a parent co-signer. The repayment terms, origination fees, interest rates are sent by the private lender. The plus loan terms are set by the federal govt. If you want a plus loan, it is done through the school’s FA office (probably info online).
I really do understand wanting to help your son get away and go to college. You are just paying a big price for it, and so may your other children. If you use your savings, you’ll have no emergency fund. If you have other children at home, it’s unlikely you’ll be able to work a second job as was suggested above. If you take out a Plus loan you can defer repayment while your son is in school but you cannot defer the interest, so that will build and build. If you can restart the payments immediately, that’s best but expensive. If you take out the Plus you, you and not him, will owe $12000 plus interest at the end of the first year. There is an origination fee, so you won’t actually get $12000 disbursed for the loan, so you may have to come up with a payment each semester to the school to cover the full bill.
As I suggested above, see if he can defer his start until Jan. He can work until then.
My kids had a rough high school experience as they had to go to 3 different schools (none with friends from middle school) because of moves. They really wanted to go to colleges in California and we just couldn’t afford it. I had to set the college budget at what I could afford. They were disappointed. They ended up liking their schools just fine. They would have LOVED a California school but that just wasn’t a financial option. They could have just moved to California if they had wanted to but they wanted college first.
IMO it is better to disappoint your son now, for perhaps 6 months or a year, then to have him go into debt and really restrict his career. If he is 18 now, he can refuse visitation with his father. He can travel on his own. He can get a job on a cruise ship and practice his film making or work in the theater or lighting groups. He can make money doing a vlog. And save money for next year.
This is all very disappointing right now, but it will also be disappointing next year when you can’t afford a second year loan and you’re still paying on the first year loan. And what will your other kids do when they need college tuition?