In the US: "In 2000, the top 25 percent of all taxpaying filers paid a whopping 83.6 percent of all income taxes. By 2005, they paid 85.6 percent of all taxes. So in spite of tax rate cuts for the well-off, the share of taxes paid by the well-off has risen." http://www.dallasnews.com/sharedcontent/dws/bus/columnists/s... - The irony is that tax cuts for the rich under the Bush Administration made taxation more progressive as it grew the overall tax base.

More here: http://taxprof.typepad.com/taxprof_blog/2007/10/top-1-pay-mo... "The new data shows that the top-earning 25% of taxpayers (AGI over $62,068) earned 67.5% of the nation's income, but they paid more than four out of every five dollars collected by the federal income tax (86%). The top 1% of taxpayers (AGI over $364,657) earned approximately 21.2% of the nation's income (as defined by AGI), yet paid 39.4% of all federal income taxes. That means the top 1% of tax returns paid about the same amount of federal individual income taxes as the bottom 95% of tax returns."