May a broker pay compensation to an unlicensed assistant based on the sale or lease of a property?

No, unlicensed assistants and other unlicensed employees receive compensation based on their work, unrelated to the success of a transaction. (A.R.S. § 32-2155.B) If an unlicensed assistant is paid on any basis that relies on the ultimate sale of a property, then the assistant must be licensed.