Income tax is a direct tax which is levied on the income of private individuals. Various income tax systems exist. Those range from a flat tax to an extensive progressive tax[?] system.
Taxes levied on the income of companies is called corporate tax[?].
... households are made up of individuals and 4.9% have someone living alone who is 65 years of age or older. The average household size is 2.26 and the average family size ...