Ohio Revised Code Title I. State Government § 135.21

All investment earnings on money included within a public deposit of a subdivision and belonging to undivided tax funds shall, except as otherwise expressly provided by law, be apportioned by the auditor pro rata among the separate funds or taxing districts in the proportions in which they are entitled to receive distribution of such undivided tax funds, due allowance being made for sums transferred in advance of settlements. All investment earnings from other moneys deposited by a treasurer, which by reason of being custodial funds, or funds belonging in the treasury of a taxing, assessment, or other district of which the treasurer is acting as ex officio treasurer, or for any other reason, do not belong in the treasury of the state or subdivision shall, except as provided in section 135.351 of the Revised Code, be apportioned among and credited to the funds to which the principal sums of such deposits or investments belong. All other investment earnings, except as provided in section 135.351 of the Revised Code and by resolution adopted pursuant to section 3315.01 or 3375.391 of the Revised Code, shall be credited to the general fund of the county, municipal corporation, township, taxing district, assessment district, or other local authority to which the principal sum thereof belongs.

All investment earnings on money included within the state treasury shall be credited as provided in section 113.09 of the Revised Code.

The director of budget and management shall inform the treasurer of state in writing of the amount apportioned by the director to each fund or account in the state treasury. The auditor of a subdivision shall inform the treasurer of the subdivision in writing of the amount apportioned by the auditor to each fund, district, or account.