Consequence for housing illegal immigrants?

Question

as in, letting them live in your house, and pay you rent

Answer 1

hmm..prettyy big

Answer 2

Define "housing."  If you mean the process of smuggling them over here and getting them set up with fake papers then the consequences are, and should be, very severe.  If all you mean is renting an apartment to them then there should be no penalty but there are some localities that impose fines on building owners.