Okla. Stat. tit. 43, § 118

A. There shall be a rebuttable presumption in any judicial or administrative proceeding for the award of child support, that the amount of the award which would result from the application of the following guidelines is the correct amount of child support to be awarded. B. The Schedule of Basic Child Support Obligations assumes that all families incur certain child-rearing expenses and includes in the basic child support obligation an average amount to cover these expenses for various levels of the parents' combined income and number of children, comprised of housing, food, transportation, basic public educational expenses, clothing, and entertainment.