Oklahoma Child Support Calculator

Oklahoma uses the income shares model under Title 43 §§ 118–118I, combining both parents' gross monthly incomes and applying the Child Support Guideline Schedule (§ 43-119) to determine a base obligation. The total amount is split proportionally based on each parent's share of combined income. For example, at $15,000 combined monthly income, base support for one child is $1,372 per month. Courts add health insurance and childcare costs on top of the base amount.

Oklahoma defines gross income broadly under § 43-118B to include wages, salaries, bonuses, commissions, pensions, rental income, interest, dividends, and Social Security benefits. Courts use whichever calculation is most equitable: current monthly gross income, the prior year's average while employed, or imputed income if a parent is voluntarily underemployed. Income from means-tested public assistance programs like TANF is excluded.

Oklahoma applies a shared parenting adjustment under § 43-118E when the non-custodial parent has at least 121 overnights per year with the child. Each overnight must include at least 12 hours of physical custody and control. The more overnights the obligor parent exercises, the greater the reduction in their child support payment. This adjustment recognizes the increased direct costs that parent incurs during extended parenting time.

Oklahoma allows child support modification under § 43-118I when a material change in circumstances has occurred. If the recalculated amount differs by more than 20% from the current order, modification may be granted. Either parent can request a review through Child Support Services if the order was not reviewed within the past 12 months. The review and modification process must be completed within 180 calendar days.

Oklahoma child support covers more than basic living expenses. Beyond the base guideline amount, courts add children's health insurance premiums — capped at 5% of the covering parent's gross monthly income — and work-related or school-related childcare costs under § 43-118D. These additional costs are divided proportionally between parents based on their income shares. Courts may also order payment of extraordinary medical or educational expenses.

Oklahoma's Child Support Guideline Schedule under § 43-119 caps at $15,000 combined monthly gross income. At that cap, base support ranges from $1,372 for one child to $2,955 for six children. For combined incomes exceeding $15,000, courts calculate the guideline maximum plus an additional discretionary amount based on the child's actual needs, each parent's ability to pay, and the child's prior standard of living.

Oklahoma child support generally continues until the child turns 18 under Title 43. If the child is still attending high school at age 18, support automatically extends until graduation or age 20, whichever comes first — no court hearing is required for this extension. Support may continue indefinitely for a child with a physical or mental disability that prevents self-sufficiency. Parents can also voluntarily agree to extend support through college.

Oklahoma enforces child support primarily through mandatory income assignment (wage garnishment) under Title 56 § 237. The Department of Human Services Child Support Services can initiate enforcement without a complaint from the receiving parent. Additional penalties include bank account levies under § 240.22, credit bureau reporting of arrearages every 30–35 days, tax refund intercepts, license suspension, and potential federal criminal charges for persistent nonpayment.