Despite making more than a billion dollars, some of the nation’s super rich manage to pay an extremely low tax rate.

The top 400 earners in the U.S. paid an average tax rate of 18 percent, according to a Bloomberg TV report noticed by Think Progress. And though that’s a far lower rate than the 26.5 percent that many families making less than $100,000 pay annually in taxes, some of America’s super-rich have been able to whittle their tax bill down even more, paying a tax rate as low as one percent, according to Bloomberg.

How? Many of the super rich take advantage of a variety of tax loopholes to lower their tax burden. For some of America’s rich, most of their wealth comes from stock appreciation, according to Bloomberg, which some billionaires don’t end up defining as taxable income.

These findings echo earlier reports, which suggest that the super rich may not be paying their full share in taxes. More than 1,400 millionaires paid no U.S. income taxes in 2009, according to an August report from the Internal Revenue Service.

In addition, 25 percent of all millionaires pay a smaller percentage of their income taxes than millions of middle class households.

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