Ofcourse it doesn't work that way at all. That's why I said it's illegally done. If the minimum wage required is $15/hr and I only get paid $12/hr, then that $3 (assumed tax deduction) difference goes to the government (the employer won't pocket it coz it's on paper). Obviously that's not how taxation works 'cause it's more complicated than that and I would still call it tax evasion coz it didn't go under a legal process. Like I said before I'm just being practical here. Therefore at the end of the day (again I don't know how my employer filed their taxes) the government still gets to collect the taxes just not in a way that's being audited normally. Now despite that, the government being the law of the land they are, would still want that underpaid $12/hr be taxed and I get that. By the way, just a little rant, I spent thousands of dollars trying to stay here permanently but it didn't work out for me. I hope you understand my sentiment, but whatever.
Note: None of my explanations matter anyway coz I obviously worked illegally after my work permit expired. All of the cash that I earned afterwards are invalid earnings. But only if I get to court. Until then, I'm taking the money home with me. I'm not sorry coz I worked hard for it.
Anyway (like you said), thank you for guiding me to do the most practical way to deal with my situation.