The Social Security Administration made
$6.5 Billion in overpayments in 2009. That includes $4 Billion under a supplemental income program for the very poor. The Inspector General for Social Security says that, in all, about ten percent of the payments made by the agency's Supplemental Security Income program were improper. If you include the $1.5 billion dollars in underpayments, Social Security made a total of $8 billion in improper payments in 2009.