Yes, he will need to file since the stimulus will ultimately be based on information from your 2020 return. Since you have already filed your 2020 return, the IRS should use your 2020 return to determine your payment, however it is possible they will go by your 2019 return and you will receive the stimulus payment for him as a dependent. Even if this does happen, you will still want to file his return as he will qualify based on being a taxpayer and not a dependent in 2020. There is no provision for repayment of overpaid stimulus money.
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