Federal workers faced unpaid furloughs in 2013 as a result of government-wide spending cuts. And in solidarity with them, President Barack Obama has made good on his promise to donate 5 percent of his salary to the U.S. Treasury.

The Treasury said last Friday that the president had written his last of seven checks to the "General Fund" as of Sept. 30, 2013, a story first reported by the Wall Street Journal.

The first six checks -- from "B and M Obama" -- were for $2,858 apiece, and the last was for $2,852 for a total donation of $20,000.

The president's annual salary is $400,000.

"The president has decided that to share in the sacrifice being made by public servants ... he will contribute a portion of his salary back to the Treasury," then-White House press secretary Jay Carney said in a statement in April of 2013.

While the money Obama paid to the Treasury was marked on his checks as a "donation," he did not take a deduction for it on his 2013 tax return.