Ohio Revised Code Title XLVII. Occupations Professions § 4705.15

(A) As used in this section:

(B) If an attorney and a client contract for the provision of legal services in connection with a claim that is or may become the basis of a tort action and if the contract includes a contingent fee agreement, that agreement shall be reduced to writing and signed by the attorney and the client. The attorney shall provide a copy of the signed writing to the client.

(C) If an attorney represents a client in connection with a claim as described in division (B) of this section, if their contract for the provision of legal services includes a contingent fee agreement, and if the attorney becomes entitled to compensation under that agreement, the attorney shall prepare a signed closing statement and shall provide the client with that statement at the time of or prior to the receipt of compensation under that agreement. The closing statement shall specify the manner in which the compensation of the attorney was determined under that agreement, any costs and expenses deducted by the attorney from the judgment or settlement involved, any proposed division of the attorney's fees, costs, and expenses with referring or associated counsel, and any other information that the attorney considers appropriate.