In my daughter’s case, she’s definitely supported herself more than I have supported her, even while in school, in 2018. Since graduating in May and starting a job in July (plus she did have a job her last semester in school), she’s made much more than I provided in support, she paid her own rent and insurance, and I really paid very little.
I don’t benefit from claiming her as we used the 4 years of AOTC, she has her own insurance and HSA, needs her own tax benefits. She’ll benefit by not having to file the kiddie tax forms. As I said, for once, the tax scheme works for us.