The top 1% of all filers paid about 35% of all federal income taxes in 2011, the most recent year IRS has analyzed. Filers need to have adjusted gross income (AGI) of at least $388,905 to qualify for the top 1% of earners.
The highest 5% paid 56.5% of total income tax. They each had AGI of at least $167,728.
The top 10% of filers, those with AGIs of $120,136 or more, bore 68.3% of the total tax burden.
The bottom 50% of filers paid 2.9% of the total tax burden.