Tax Rate seems low?

I've had a couple years where Turbo Tax results in pretty low taxes.  I did just retire, so have no income, but even then seems like I would have higher taxes just based on investments.  When I try to figure out where the tax calculation is coming from . .... I THINK it is the Qualified Dividends and Capital Gains Tax worksheet.  Maybe that excludes a lot?  I'm concerned TT isn't getting my calculated taxes right as my tax rate seems to be .5% (.005) or so.  ?