The cost of providing for the president doesn't end once he leaves the White House.
A recent report by the nonpartisan Congressional Research Service says taxpayers spent nearly three-point-seven million dollars on the four living ex-presidents.
The money went to everything from their postage to travel.
Of the four living presidents, George W. Bush spent the most at about one-point-three million dollars.
Jimmy Carter spent the least at a little more than 500,000 bucks.
The funds are part of an allowance created in 1958.