Ohio Revised Code Title LVII. Taxation § 5725.20

On or before the first Monday of May in each year, the superintendent of insurance shall certify to the treasurer of state the amount of the capital and surplus of each domestic insurance company having capital divided into shares and the surplus of each domestic insurance company not having capital divided into shares, or the amount equal to eight and one-third times the gross amount of premiums received by any such domestic insurance company from policies covering risks within this state during the preceding calendar year after making the deductions prescribed by section 5729.03 of the Revised Code for foreign insurance companies, as reported in the annual statement of the company and approved by the superintendent.