Most do not file taxes. They just have the money withheld from their checks. It’s how the legals and the illegals meld together.
Now those who game the system for the credits? That’s a different universe. Those are the same ones who don’t work and just get government bennies. Entirely different situation there.
Well, according to the lib leaning IPC, only half of them pay income taxes:
http://www.immigrationpolicy.org/just-facts/unauthorized-immigrants-pay-taxes-too
We need the other half to pay. And all of them to pay serious fines, serve jail time if necessary, and complete community service, just like everyone else does when they break the law.