Enforcing employer sanctions will work, at least as to a lot of illegals. (Many work off the books and will continue to, but the ones that are on a payroll will self-deport if e-check and employer sanctions are rigorously enforced.) But you didn't talk about that-- you were talking about taxing remittances, which won't work.
I didn’t say a word about taxing remittances-you responded to the wrong post, I guess.
Yes, making such employers following the law - including fines or jail time if they are caught paying anyone under the table - is a great incentive.