The top-earning 1% earned 8% of all income in 1979, and 17% in 2007, post-taxes and post-transfers, according to the CBO report Historical Trends in Income Distribution between 1979 and 2007. This Saez, Picketty and Stantcheva proposal would double their income taxes, increasing their total tax burden from $419 billion to $869 billion. I’m looking at the Joint Committee on Taxation report. This from page 28 of http://www.novoco.com/hottopics/resource_files/jcx-18-12.pdf —
The top 0.8% of taxpayers (not 1%) with incomes over $500,000, take in 15.1% of all income or $1.7 trillion (total US personal income of $11.468 trillion), averaging $1.47 million per taxpayer, and are 1.156 million taxpayers, and they pay 20.8% of all federal taxes, and their tax rate is 24.8%, and they paid $418.8 billion in 2011.
It’s pleasant to see UC Berkeley professors present such a radical tax jump on the super-wealthy.

Here’s a site at Citizens for Tax Justice that shows the effective over-all tax rates in the U.S. — http://ctj.org/ctjreports/2012/04/who_pays_taxes_in_america.php
The top 1% pay a rate of 30.9% and the average for all taxpayers is 27.9%. This includes state and local taxes.
I’m tempted to look at Rasmus’ Epic Recession and the 28 proposals to end the recession. It calls for about $1 trillion in government jobs creation, which is also at the amount below potential GDP our economy is functioning, 5 to 6% below full potential. This is not a wild program, the EPI presented a program “Putting America Back to Work” that added up to $950 billion per year to add 11 million jobs. It only sounds unreasonable and irresponsible when compared to what passes as prudent economic policy, or as Obama says, “responsible” cuts, or whatever. Returning to 1979 is irresponsible? Wallowing forever in a quicksand economy is responsible? We need to employ at fair income levels all who wish to work — full employment. Each worker generates today over $109,000 in output on average according to the SF Federal Reserve. That should be enough to eliminate poverty and allow hiring of the 10% whom private enterprise is unwilling to hire. Last I looked private sector employment was still at the 2000 level, 111 million workers, even though the working population has added another 31 million. When 1 in 6 workers is still looking for full-time year-round work, allowing that talent to waste away unproductively is irresponsible.