You listened to Carly Fiorina (snicker). You wouldn't recognize the truth if it bit you on the nose. As usual, the right wing truthy sounds-true-but-isn't echo chamber stuff fed directly to ignoramuses like you has is exactly backwards. More than 80% is put to use, not spend on overhead.
https://en.wikipedia.org/wiki/Clinton_Foundation
CharityWatch, says that 88% of the foundation's money goes toward its charitable mission and gave the foundation an A rating for 2016.
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http://www.factcheck.org/2015/06/where-does-clinton-foundation-money-go/
We looked at the consolidated financial statements (see page 4) and calculated that in 2013, 88.3 percent of spending was designated as going toward program services — $196.6 million out of $222.6 million in reported expenses.
More than 85% of everything donated to the Clinton Foundation goes towards good works. Wrong again Dave.