The IRS reports,

For tax year 2004…Taxpayers with an AGI of at least $328,049, the top 1 percent of taxpayers, accounted for 19 percent of total AGI, representing an increase in income share of 2.2 percentage points from the previous year. These taxpayers accounted for 36.9 percent of the total income tax reported, an increase from 34.3 percent in 2003.