Thank you for this question and answer -- I struggled for hours trying to figure out why Turbotax was showing a different Tax amount in line 16 than the IRS tables dictated for the Taxable amount in line 15.
The answer as you indicated was the Qualified Dividends and Capital Gain Tax Worksheet (called "Qual Div/Cap Gn") in the Forms list).
Turbotax could do a real service by adding a note to the 1040 worksheet to indicate that the line 16 Tax was calculated in that worksheet. Also a less abbreviated name for this critical form would make it easier to find -- e.g. spelling out "Qualified" and "Gains", and adding "Worksheet". There's plenty of room.
