Oklahoma Child Support Computation for Period Prior to July 1, 2009, Instructions covers the guidelines for determining the amount of court-ordered child support prior to July 1, 2009. The types of Oklahoma Child Support Computation Instructions are: 1. Basic Support Computation — This calculation includes the parents' combined Adjusted Gross Income (AGI), number of children, and other factors to determine the basic amount of support. 2. Additional Support Guidelines — This calculation includes factors such as day care costs, child health insurance costs, extraordinary medical costs, educational costs, extracurricular activity costs, and other special expenses. 3. Child Support Adjustment — This calculation is used when one or both parents have other children living in their home. It factors in the number of other children in the household and adjusts the amount of child support accordingly. 4. Combined Support Computation — This calculation is used when one parent is paying child support to multiple people. It takes into account all child support payments and determines the amount of support for each child. 5. Self-Support Reserve — This calculation is used when one parent is not able to provide sufficient financial support for their children due to their own financial circumstances. It takes into account the parent's income, expenses, and other financial obligations to determine a minimum amount of support.