Undocumented immigrants pay taxes. Between one half and three quarters of undocumented immigrants pay state and federal taxes. They also contribute to Medicare and provide as much as 7 billion dollars a year to the Social Security Fund. Further still, undocumented workers pay sales taxes where applicable and property taxes – directly if they own and indirectly if they rent.
(Source: Immigration Policy Center, “Undocumented Immigrants as Taxpayers,” November 2007)