Ohio Rev. Code Ann. § 5729.03
(A) If the superintendent of insurance finds the annual statement required by section 5729.02 of the Revised Code to be correct, the superintendent shall compute the following amount, as applicable, of the balance of such gross amount, after deducting such return premiums and considerations received for reinsurance, and charge such amount to such company as a tax upon the business done by it in this state for the period covered by such annual statement: