Basically it is added to your other payments and refundable credits as follows.
- On the 1040 Line 16 is your total tax
- Line 17 notes your Federal Tax Withheld on W-2's and 1099's
- As noted The Credit for Excess Social Security flows to Line 18d
- When added to other payments and refundable credits it moves to Line 18e
- This line is then added to Line 17 (noted above) and totaled on Line 20.
- At this point if line 20 is greater than line 16 you get a refund.
If Line 16 is greater than Line 20 you have tax due.
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