posted by O-TrapBut you can't tax someone's income if they're undocumented.
Unless they're paid illegally under the table, you probably take more taxes from undocumented workers. If they don't file taxes, they aren't collecting numerous credits that would result in a refund of some of the taxes withheld by the employer. Most of their taxes are otherwise FICA, which is, again, withheld (supposedly 3/4 of illegal workers have payroll taxes withheld).
I couldn't tell you how many illegals file taxes. But many have fraudulent/fake/duplicate social security numbers, so they may be filing taxes. I don't know, but I'm guessing it may be more of a red flag for them not to file since otherwise there's a W2 with no matching tax return every year.
Actually, I'd think most illegals do file (if they have a social security) to avoid the red flags AND to get that refund. Except just like welfare leeches know every trick, illegals would probably school us on taxes....they probably know the max number of exemptions to claim without raising flags to minimize their withholding.