I think you mean you reported more for qualifying education expenses then you were entitled to on your tax return. You would have to prepare an amended return to see if your tax increased when you correct the education expense entry and if so, file the amended return.
Your son would most likely have to file a return if his income was over the standard deduction, which is $14,600 in 2024 for a single filer. He could us this IRS tool to determine if he needs to file a tax return. If he is not required to file a tax return, he can still do so to get a refund of taxes withheld from his pay (box 2, 17 or 19 on his W-2 form ).
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