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If your son was 17 at the end of 2020 he was not eligible for the $600  2nd stimulus payment.  Looks like you got the $1400 3rd payment for both of you, and that was correct.  They changed the criteria for the 3rd payment so that you could get it for any dependent no matter what their age.  You should also still get the $500 credit for other dependent for him.   It will be on line 19 of your Form 1040.

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