From the Wall  Street Journal:
 
The federal income tax code is now so  mangled that we can probably increase federal revenues with a 0% income  tax rate for a majority of Americans.
Long before President Barack Obama took  office, the bottom 40% of income earners paid no federal income taxes.  Because of refundable income tax credits like the Earned Income Tax  Credit (EITC), in 2006 these bottom 40% as a group actually received  net payments equal to 3.6% of total income tax revenues, according to  the latest Congressional Budget Office data. The actual middle class,  the middle 20% of income earners, pay only 4.4% of total federal income  tax revenues. That means the bottom 60% together pay less than 1% of  income tax revenues.
This actually resulted from Republican  tax policy going all the way back to the EITC, which was first proposed  by Ronald Reagan in his historic 1972 testimony before the Senate Finance  Committee on the success of his welfare reforms as governor of California.  Besides calling for workfare, Reagan proposed the EITC to offset the  burden of Social Security payroll taxes on the poor. As president, Reagan  cut and indexed income tax rates across the board and doubled the personal  exemption. The Republican majority Congress, led by former House Speaker  Newt Gingrich, adopted a child tax credit that President George W. Bush  later expanded and made refundable, while also reducing the bottom tax  rate by 33% to 10%.
President Bill Clinton expanded the EITC  in 1993. But it was primarily Republicans who abolished federal income  taxes for the working class and almost abolished them for the middle  class. Now Mr. Obama has led enactment of a refundable $400 per worker  income tax credit and other refundable credits, which probably leaves  the bottom 60% paying nothing as a group on net.
Many conservatives are deeply troubled  by this, arguing that everyone should be contributing something to the  tax burden. They worry that, not paying for any of the tab, this majority  will see no reason not to vote for limitless spending burdens. But are  conservatives now going to campaign on increasing taxes on the bottom  60%, arguing that is good tax and social policy? Steve Lonegan recently  demonstrated in the New Jersey gubernatorial primary that this is not  a viable political position. He proposed a 3% state flat tax which,  while very good tax policy, would increase taxes slightly for the bottom  half of income earners. His victorious opponent Chris Christie pounded  away in advertising on that point.
But what if Republicans proposed a federal tax reform with a 0% income tax rate for the bottom 60% of income earners? With that explicit 0% tax rate framing the issue, abolishing the refundable tax credits that actually ship money to lower income earners through the tax code would become politically viable. Trading an explicit 0% tax rate for the bottom 60% in return for eliminating the refundable tax credits would likely be at least revenue neutral, and probably result in a net increase in revenue.
