Line 17,column a, on Form 8379 is the sum of: Schedule 3, line 7 and line 18b of the form 1040 from the original filed return.
Line 20, column a, is derived by starting with Schedule 3, line 14 and subtracting the following,
tax withheld (line 17 1040)
EIC (line 18a 1040),
Excess SS, (Schedule 3, line 11)
Add'l child tax credit (line 18b 1040)
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