Most professions restrict the payment of referral fees. The accounting and investment professions require disclosure, and most businesses in which referral fees are common do the same. In most other businesses, referral fees are in the 5% to 10% range. But the CFA found that 25% was the average for realty referral fees. “Nevertheless, it appears to exist.”Still, it’s not likely that referral fees will cost either the buyer or seller any more money.