Ohio Rev. Code § 3307.28
Each employer shall pay to the state teachers retirement system an amount which shall be a certain per cent of the earnable compensation of all members, and which shall be known as the "employer contribution." Each employer shall remit the employer contribution at intervals required by the state teachers retirement system. For members participating in the STRS defined benefit plan, the employer contribution shall be deposited into the employers' trust fund. For members participating in an STRS defined contribution plan, the employer contribution shall be deposited into the defined contribution fund in accordance with the plan selected by the member, less the amount transferred under section 3307.84 of the Revised Code.
The rate per cent of the contribution shall be determined by the actuary on the basis of the actuary's evaluation of the liabilities of the system, not to exceed fourteen per cent, and shall be approved by the state teachers retirement board. The board may raise the rate per cent of the contribution to fourteen per cent of the earnable compensation of all members. In making such evaluation, the actuary shall use, as the actuarial assumptions, such interest rates and mortality and other tables as are adopted by the board. The actuary shall compute the percentage of such earnable compensation, to be known as the "employer rate," required annually to fund the liability for all benefits under the STRS defined benefit plan, after deducting therefrom the benefits provided by the member's accumulated contributions, as defined in section 3307.50 of the Revised Code, deposits, and other appropriations, and to fund any deficiencies in the funds described in divisions (A) to (F) of section 3307.14 of the Revised Code.
R.C. § 3307.28