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I'm helping my ex-husband filling out form 709.

 

I don't understand how you get a credit on line 12.  

Line 1 and 3 are both $5,000

Line 4 and 6 are $900

Line 15, 17 and 19 are all $900.

The rest of lines are all 0.

Line 12 is the smaller of line 6 or 11, so that means line 12 is 0; no credit to offset $900.