If none of the boxes are checked on Line 16 Tax (see instructions). Check if any from Form(s): 1 8814 2 4972, then there are no added taxes from including your children's interest or dividends (Form 8814) or from a tax on lump-sum dostributions (Form 4972).
If you are in the Desktop version, you have access to the 1040 worksheet in Forms. In the online version, you will have access once you pay.