Ohio Rev. Code § 3119.22
The court may order an amount of child support that deviates from the amount of child support that would otherwise result from the use of the basic child support schedule and the applicable worksheet if, after considering the factors and criteria set forth in section 3119.23 of the Revised Code, the court determines that the amount calculated pursuant to the basic child support schedule and the applicable worksheet would be unjust or inappropriate and therefore not be in the best interest of the child.
If it deviates, the court must enter in the journal the amount of child support calculated pursuant to the basic child support schedule and the applicable worksheet, its determination that the amount would be unjust or inappropriate and therefore not in the best interest of the child, and findings of fact supporting that determination.
R.C. § 3119.22