President Barack Obama said in Wednesday night’s presidential debate that Social Security is “structurally sound,” but Social Security’s Board of Trustees said in their 2012 annual report that the program faced $8.6 trillion in “unfunded obligations”–meaning that it is currently obligated to pay out $8.6 trillion more in benefits than it is anticipated to bring in through taxes.

During Wednesday debate, moderator Jim Lehrer asked Obama: “Do you see a major difference between the two of you on Social Security?”