Ohio Rev. Code § 5705.315
With respect to annexations granted on or after March 27, 2002, and during any tax year or years within which any territory annexed to a municipal corporation is part of a township, the minimum levy for the municipal corporation and township under section 5705.31 of the Revised Code shall not be diminished, except that in the annexed territory and only during those tax year or years, and in order to preserve the minimum levies of overlapping subdivisions under section 5705.31 of the Revised Code so that the full amount of taxes within the ten-mill limitation may be levied to the extent possible, the minimum levy of the municipal corporation or township shall be the lowest of the following amounts:
The municipal corporation and the township may enter into an agreement to determine the municipal corporation's and the township's minimum levy under this section. If it cannot be determined what minimum levy is available to each and no agreement has been entered into by the municipal corporation and township, the municipal corporation and township shall each receive one-half of the millage available for use within the portion of the territory annexed to the municipal corporation that remains part of the township.
R.C. § 5705.315