Illegal aliens using your Social Security Number to work under falsely, may use several numbers during his/her stay in America.  They work for years and SSN accounts show lots of money paid into the system.  This is called a windfall.  This illegal reaches retirement age and decides to collect benefits.  They are assigned a non-number by the Social Security Admin.  Someone in SSA takes the former illegal's list of employers and bogusly used SSN's and pulls out all those earnings and credits the non-number.  Then they begin collecting SSA retirement or SSI benefits.  This is called paying out more than was collected.  Some are able to obtain SSA benefits, because they present a Puerto Rican birth certificate (which they obtained for a bribe).  Calculating welfare benefits is also interesting.   A US citizen with 3 children earning $500 a month working part-time receives less money that an illegal alien with 3 children earning $500 a month working illegally part-time.  The reason is because the illegal's income is considered excluded with only a prorata amount allowed for the children, while the citizen's entire income is countable against the grant ceiling.  The illegal would not receive any allowance for her needs in the computation, but the ceiling amount for the 3 children less the prorata earnings equals MORE cash aid to the working illegal mother.