Check this:
http://www.freerepublic.com/focus/f-news/1840296/posts
IRS Caters To Illegal Immigrants - 36 million illegal aliens perhaps?
[snip]This year tax preparers in several Border States are reporting a huge surge in the number of illegal aliens requiring tax filing services. One Phoenix Arizona company that caters to Hispanics is making a killing. The owner says that the majority of his 10,000 customers filing taxes are illegal immigrants without Social Security numbers. [and getting EIC)