If a portion of your income was due to long-term capital gains or qualified dividends, then your tax liability could be lower than expected due to a portion of your income being taxed at 0%.
When this is the case, your tax liability is calculated on a worksheet called Qualified Dividends and Capital Gains Tax Worksheet instead of simply being determined by the tax tables.
You can see this worksheet by going to Forms at the top of your screen (if you are using a desktop version of TurboTax). Look for Qual Div/Cap Gn in the list on the left side of the screen.
If you are using TurboTax Online, you can also print this worksheet after your TurboTax fee has been paid.
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