It is the amount you will see on line 24 of your 1040. Your nonrefundable credits are credits that will reduce your tax liability to $0, but not below $0. It is calculated by taking your original tax due on line 16 then subtracting your nonrefundable tax credits which will result in the number you see on line 24.
They are different from refundable credits which will result in extra money being sent to you that you did not pay in.
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