It is not an error to add the the Form 8959. You are correct that line 31 is for deducting your estimated payments made. Are you sure you don't have one of the forms listed below?
However, certain amounts must be added back on line 28, including the following:
- Excess advance premium tax credit repayment reported on the federal 1040, Schedule 2, line 24.
- Federal self-employment tax reported on the federal 1040, Schedule 2, line 4.
- Unreported Social Security and Medicare tax on the federal 1040, Schedule 2, line 4.
- Additional tax on IRAs and other qualified retirement plans reported on the federal 1040, Schedule 2, line 6.
- Federal household employment tax reported on the federal 1040, Schedule 2, line 7a.
- First-time homebuyer credit repayment reported on the federal 1040, Schedule 2, line 7b.
- Additional Medicare tax from federal form 8959 reported on the federal 1040, Schedule 2, line 8a.
- Other additional federal taxes reported on the federal 1040, Schedule 2, line 8c.
This is from the Iowa instructions for step 7, line 31.
If none of these apply to you, you may want to contact a specialist that can work through that section of the return with you.
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