And here - http://www.american.com/archive/2007/november-december-magazine-contents/guess-who-really-pays-the-taxes http://www.american.com/archive/2007/novembe

And here - http://www.american.com/archive/2007/november-december-magazine-contents/guess-who-really-pays-the-taxes http://www.american.com/archive/2007/november-december-magaz... - is a breakdown on each income group's share in taxes paid. The data is from 2004, but even now the ratio is pretty much the same. (Un-?)surprisingly, the original infographics failed to picture this.