Oklahoma Child Support Calculator

How Oklahoma Calculates Child Support

Oklahoma calculates child support by first combining you and the other parent's gross monthly incomes to determine a total basic obligation. Governed by Okla. Stat. tit. 43, § 118, your share of this basic obligation is then figured based on your percentage of the combined income.

Shared Custody and Your Support Obligation

In Oklahoma, a shared parenting adjustment is applied when each parent has the child for at least 121 nights per year. Under Okla. Stat. tit. 43, § 118E, this adjustment doesn't just reduce the paying parent's obligation; it recalculates support using a formula that accounts for the increased costs of maintaining two separate homes for the child.

Calculate Your Support

✓ Verified for 2026 Guidelines • Reviewed October 2026 by Harmoney

Oklahoma Child Support Guidelines at a Glance

Guideline Model Income Shares Model
Governing Legal Authority Okla. Stat. tit. 43, § 118 / § 119
Shared Custody Threshold 121 Overnights Annually
Age Support Ends Age 18 (or 19 if still in High School)
Modification Standard Material Change in Circumstances (20% Change in Guideline Amount is Presumed)

Frequently Asked Questions About OK Child Support


At what age does child support end in OK?

Child support in Oklahoma ends when a child turns 18, unless the child is still attending high school, in which case it continues until age 19 or high school graduation, whichever occurs first. This obligation is outlined in Oklahoma Statutes Title 43, § 112(E). Support may be extended by agreement for a disabled adult child who is not otherwise emancipated.

How is child support calculated if one parent is unemployed in OK?

If a parent is voluntarily unemployed or underemployed, Oklahoma courts will impute income to them based on their potential earning capacity, prior work history, and local wage rates. As detailed in Okla. Stat. tit. 43, § 118B(D), income will not be imputed if the parent is physically or mentally incapacitated or is caring for a child under three years of age for whom support is being determined.

How do I modify a child support order in OK?

You can modify a child support order in Oklahoma by showing a material change in circumstances, which is presumed if the current guideline amount would change by at least 20%. Governed by Okla. Stat. tit. 43, § 118I, a material change could include a significant change in either parent's income, custody, or the child's needs, requiring you to file a formal motion with the court.

Does OK child support cover college expenses?

No, Oklahoma law does not require parents to pay for college expenses as part of child support, as the legal obligation ends at age 18 or 19. Support for post-secondary education can only be enforced if the parents have voluntarily agreed to it in a legally binding document, such as a divorce decree or a separate contract.

How does OK handle health insurance and childcare costs?

Health and dental insurance premiums and actual, work-related childcare costs are added to the basic child support obligation and are divided between the parents in proportion to their incomes. According to Okla. Stat. tit. 43, § 118D and § 118F, these are mandatory 'add-on' expenses, and the parent who pays these costs receives a credit against their share.