(1) The division is in proportion to the services performed by each lawyer [...], and
(2) The client is advised of and does not object to the participation of all the lawyers involved; and
(3) The total fee is reasonable
Thus, using a client disclosure form of the type that can be found here, you may bill your client for the use of my services at a reasonable rate, using the ordinary factors of SCR 3.130(1.5)(a). For example, you may bill for my work at the rate of a junior associate, senior associate, or at your own rate, depending on the amount of work you perform in relation to the legal services rendered.
Q. Is the contract attorney's work properly billed as a "legal service" or as an "expense"?
If a surcharge is added, the contract attorney's work should be billed as a "legal service" rather than an expense. While neither the Kentucky Supreme Court nor the KBA has issued a formal opinion on precisely this matter, the American Bar Association has advised that
a lawyer may, under the Model Rules, add a surcharge on amounts paid to a contract lawyer when services provided by the contract lawyer are billed as legal services. This is true whether the use and role of the contract lawyer are or are not disclosed to the client. The addition of a surcharge above cost does not require disclosure to the client in this circumstance, even when communication about fees is required under Rule 1.5(b). If the costs associated with contracting counsel's services are billed as an expense, they should not be greater than the actual cost incurred, plus those costs that are associated directly with the provision of services, unless there has been a specific agreement with the client otherwise.
ABA Formal Opinion 00-420 at 5 [emphasis supplied].