The worksheet won't come into play if your son is over 19 and not a full-time student. You can't claim a relative that is over 19 (unless they are disabled), not a student and made over $4300. If he had made less than $4300, you would use the support worksheet to see if you paid for over half of his support to determine whether or not he is a qualifying relative.
Who can I claim as my dependent? @ld1995
I am assuming he was over 19 and not a student in 2021. When you indicate that, TurboTax will ask how much he earned and if over $4300, TurboTax will tell you that he does not qualify to be your dependent. You won't be asked about support in that situation.
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