That compares with the 31% rate paid by Gingrich and the 14% paid by Romney, both of whom have much higher incomes.
The president seeks to raise $1.5 trillion in the next 10 years from wealthy Americans. Yet most of his proposals were also in last year's budget and went nowhere.
Facebook's IPO indicates its founder will pay a hefty tax bill for exercising stock options. That income is taxed at the 35% rate, since entrepreneurs don't get the same treatment as investors.
The GOP candidate's 13.9% rate draws attention to a tax break for investment execs that taxes profits at the capital gains rate of 15% rather than the regular rate of up to 35%.
Romney favors the orthodox GOP approach of lowering tax rates and overhauling the corporate tax system. Gingrich's plan is more radical and much more difficult to achieve.
A California campaign comparing reality star's tax bill with that of a middle-class earner is misleading and fails to account for federal taxes.
GOP candidate's proposal would cut taxes 62% for millionaires and put a major hole in the federal budget, analysis finds. Gingrich disputes deficit projection.
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MONEY & POLITICS
Breaking up big banks is an untested solution to the too big to fail problem that attempts to isolate and dismantle large, troubled institutions while protecting the rest of the economy.
The IRS is struggling to combat identify thieves who file fraudulent tax returns in the names of older residents who don't need to file.