For a licensed business operating in state, referrals are not illegal per se. Its how you manage the referral fee program that can be sketchy. Be clear from the start how the program works. Keep a clear account on your books. Pay in a timely manner if the business/residence followed the guidelines accordingly. 99% of referrals are based on the stipulation that the new client signs on for the service/contract before issuance of referral pay is commenced.