According to official IRS data, the top 1% of income earners paid $84 billion more in federal income taxes in 2007 than in 2000 before the Bush tax cuts were passed, 23% more. The share of total federal income taxes paid by the top 1% rose from 37% in 2000, before the Bush tax cuts, to 40% in 2007, after the tax cuts.
In contrast, the bottom half of income earners paid $6 billion less in federal income taxes in 2007 than in 2000, a decline of 16%. The share of federal income taxes paid by the bottom 50% declined from 3.9% in 2000 to 2.9% in 2007.
The Bush tax cuts also included a doubling of the child tax credit from $500 per child to $1,000 per child. Because of that, and the 33% cut in the bottom tax rate, nearly 8 million more people dropped off the federal income tax rolls entirely, paying zero federal income taxes. Indeed, under the Bush tax cuts, the bottom 40% of all income earners not only paid no federal income taxes, as a group on net. By 2009, they were being paid cash by the IRS equal to 10% of all federal income taxes.