Once you complete your Form 8978 manually, you will get a positive or a negative number on Line 14 of the form.
If it's a positive number (indicating you owe additional tax), it is generally entered on Schedule 2, Line 17z and 21. The amount from Schedule 2, Line 21 then carries to Form 1040, Line 23.
If it's a negative number (indicating a reduction in tax), it is generally entered on Schedule 3, Line 13z and Line 15. The amount from Schedule 3, Line 15 then carries to Form 1040, Line 31.
@androw
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