Deductions & credits

Thanks for all clarifications/corrections.

So in short, capital gain, regardless of long term or short term, it will affect AGI.  and AGI will affect other tax credits, like AOTC or UCE.

The only other question to follow is how do I find out if the LCTG is taxed at different rate than ordinary income.

I see AGI increase by LCTG and I see tax increase  as well.  on the TTAX form, this is shown on how tax is determined.  Where/how can I find out how the 19644 come about?  I don't see the anything in the TTAX related to "Qualified Dividend and Capital Gain Tax worksheet"