Are you paying federal income taxes?

With the 2016 tax season behind us and listening to the NPR Politics Podcast that I listen to, did you know apparently 45% of the US population did not pay federal income tax for the 2015 tax year?  According to this MarketWatch article, the bottom 40% of the income brackets actually get money back from the federal government.

Additionally, an NPR/Ipsos Poll (link 1, link 2) result shows markedly different conception about people paying taxes.  The one result that surprised me was that 70% of the people polled believed less American’s pay federal income taxes than the actual amount (45%).  How crazy is that?