@BornInChina wrote:
my fed tax would
But why the final result is 24%, instead of 20%...
You can't look at just one number. As Critter mentioned, adding income to the tax return can change MANY things, so you need to look at EXACTLY what on the tax returns changes. There is income tax, Alternative Minimum Tax, Net Investment Income Tax, Itemized deductions may be affect, and some credit and/or deductions may be reduced. And probably other things I have not thought of.
