As you know, the income tax is not figured on the AGI, rather, when you have capital gains or qualified dividends, the income tax is calculated on the Qualified Dividends and Capital Gain Tax Worksheet.
So while line 1 on the 2210AI has your Adjusted Gross Income, the values for income tax on line 14 (2210AI) are calculated using the Qualified Dividends and Capital Gain Tax Worksheet. These values flow through to line 27, which is carried to line 10 on Part III of the 2210, as "required installments".
So, in fact, your capital gains and qualified dividends are accounted for in the calculations on the 2210.
See the Instructions for the 2210. Search for "dividends".
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