An underpayment penalty would be entered on line 24 of the Federal 1040. Are you saying that the entry is zero? If so, then no underpayment penalty has been calculated.
You can review the 1040 in TurboTax Online by following these directions.
- Down the left side of the screen, click on Tax Tools.
- Click on Tools.
- Under Other helpful links, click on View Tax Summary.
- Down the left side of the screen, click on Preview My 1040 to see the actual tax return that you prepared.
- Down the left side of the screen, click Back to return.
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