"Qualified Dividends" are taxed like long-term capital gains.

If the taxpayer's 'regular' tax bracket is less than the 22% bracket, it is taxed at 0%.  If the taxpayer's 'regular' tax bracket is 22% or higher, it is taxed at 15% (or 20% if they are in the highest tax bracket).

It sounds like most of the income falls within the 'regular' tax bracket of less than 22%, so it is taxed at 0%.