Elucidate how Personal income tax is a major source

Question

Elucidate how Personal income tax is a major source?

Answer 1

a. The Federal personal income tax is progressive.  People with higher incomes pay a higher percentage of that income as tax than do people with lower incomes.

b. A marginal tax rate is the rate at which the tax is paid on each additional unit of taxable income.

c. The average tax rate is the total tax paid divided by total taxable income.

d. A tax whose average tax rises as income increases is progressive.