According to this,
86.4% of all Federal taxes are paid by the top 40% of filers by income. And who
are these people? From the table below, the fourth quintile has a market income
of $87,700, and the top quintile has a market income of $234,400.
As noted in the
footnote of Box 1: "Market income is composed of labor income, business
income, capital gains, capital income (excluding capital gains), income received in retirement for past
services, and other sources of income. Government transfers are cash payments
and in-kind benefits from social
insurance and other government assistance programs. Federal taxes include
individual and corporate income taxes,
social insurance (or payroll) taxes, and excise taxes. After-tax income is the
sum of market income and government
transfers, minus federal tax liabilities."