Oklahoma Child Support Guidelines

Oklahoma calculates child support using the income shares model under 43 OS Section 118 and the Oklahoma Child Support Guidelines. Both parents’ gross incomes are considered to determine a combined child support obligation, which is then split between the parents in proportion to their share of the total income. Understanding how the guidelines work is essential for any parent going through a divorce, paternity case, or support modification in Oklahoma.

For a national overview of child support calculation methods, see our guide on how child support is calculated.

The Income Shares Model

Oklahoma’s income shares model is built on the principle that children should receive the same proportion of parental income they would have received if the family remained intact. The calculation follows these steps:

1. Determine each parent’s gross income
2. Combine both parents’ gross incomes
3. Look up the base child support obligation on the guidelines schedule based on the combined gross income and the number of children
4. Divide the obligation between the parents based on each parent’s percentage of the combined gross income
5. Add adjustments for health insurance, childcare, and other qualifying expenses
6. Apply the shared custody adjustment if applicable
7. Evaluate deviations if the presumptive amount would be unjust

The result is the presumptive child support amount. The court applies this amount unless there are specific grounds to deviate.

Gross Income Calculation

The foundation of Oklahoma’s child support calculation is each parent’s gross income. Under the Oklahoma Child Support Guidelines, gross income is broadly defined and includes virtually all sources of income before taxes and deductions.

Gross income includes:

• Salary, wages, and commissions
• Self-employment income
• Bonuses, overtime, and tips
• Severance pay
• Interest, dividends, and royalties
• Trust and annuity income
• Social Security benefits (except SSI)
• Workers’ compensation and disability benefits
• Unemployment compensation
• Pension and retirement income
• Alimony or spousal support received from a previous relationship
• Rental income
• Military allowances (basic allowance for housing, basic allowance for subsistence)
• Any other income from any source

Income that is not included:

• Child support received for children from another relationship
• Means-tested public assistance (TANF, food stamps, SSI)
• Adoption assistance subsidies
• Foster care payments

Unlike some states that use net income, Oklahoma’s guidelines use gross income as the starting point. However, the guidelines schedule itself is calibrated to account for taxes and standard deductions, so the resulting support amounts reflect after-tax dollars in practical terms.

Imputed Income

When a parent is voluntarily unemployed or underemployed, the court may impute income. This means the court assigns an earning capacity based on what the parent could reasonably earn. The court considers:

• The parent’s employment history and recent work record
• Education, training, and occupational qualifications
• Available job opportunities in the local labor market
• The parent’s age, health, and physical capacity
• Whether the parent is caring for a young child (under age 4), which may justify a reduced imputation

The court will not allow a parent to artificially lower their child support obligation by choosing not to work or by taking a lower-paying job without good reason.

The Child Support Guidelines Schedule

Oklahoma’s guidelines include a schedule that sets the presumptive base child support obligation based on the parents’ combined gross income and the number of children. The schedule covers combined monthly gross incomes from approximately $1,500 to $15,000 and provides specific amounts for one through six or more children.

For example (approximate figures for illustration):

For combined incomes exceeding the schedule’s maximum, the court has discretion to set support based on the children’s needs and the parents’ financial circumstances. The court may extrapolate from the schedule or determine an appropriate amount based on the evidence.

Each parent’s share of the total obligation is calculated based on their percentage of the combined gross income. If Parent A earns $6,000 per month and Parent B earns $4,000 per month, their combined income is $10,000. Parent A is responsible for 60% of the guideline amount, and Parent B is responsible for 40%.

Healthcare and Childcare Add-Ons

Beyond the base child support obligation, Oklahoma law requires certain additional expenses to be allocated between the parents:

Health Insurance Premiums

The cost of adding the child to a parent’s health insurance plan is factored into the child support calculation. Under the Oklahoma guidelines, the parent who carries the insurance receives a credit for the child’s portion of the premium. The court typically orders the parent with access to the most cost-effective coverage to carry the child’s insurance.

Unreimbursed Medical Expenses

Medical, dental, orthodontic, vision, and prescription costs not covered by insurance are divided between the parents. Oklahoma courts typically allocate these expenses in proportion to each parent’s share of the combined gross income. Parents are required to keep records of unreimbursed medical expenses and to notify the other parent of significant costs.

Work-Related Childcare Costs

Reasonable and necessary childcare expenses — including daycare, after-school care, and summer programs — incurred because a parent is working, seeking employment, or attending school are added to the base support amount and divided proportionally between the parents.

Shared Custody Adjustment

When both parents exercise substantial parenting time, Oklahoma’s guidelines provide an adjustment to account for the additional costs each parent incurs when the child is in their care. Under the Oklahoma guidelines, the shared custody adjustment applies when the non-custodial parent exercises at least 121 overnights per year (approximately one-third of the year).

The shared custody adjustment increases the base obligation by a factor (typically 1.5 to 2.0) to account for the duplicated costs of maintaining two households. Each parent’s share is then calculated based on their income percentage and their share of parenting time. The result is typically a reduced payment from the higher-earning parent compared to a sole custody arrangement, because the lower-earning parent is directly bearing more of the child’s expenses during their parenting time.

The shared custody adjustment recognizes that when a child spends significant time in both homes, both parents incur direct costs — housing, food, clothing, and activities — and the support payment should reflect that reality.

Self-Employment Income

Child support calculations for self-employed parents in Oklahoma require careful analysis. The court determines self-employment income by examining:

• Gross business receipts minus ordinary and necessary business expenses. The court distinguishes between legitimate business expenses and personal expenses run through the business.
• Tax returns and financial statements. Schedule C, Schedule K-1, and corporate tax returns are key documents.
• Depreciation and deductions. Courts may add back certain depreciation deductions and other non-cash expenses that reduce taxable income but do not reduce the parent’s actual available income.
• Lifestyle analysis. If a parent’s reported income appears inconsistent with their lifestyle — for example, claiming low income while driving expensive vehicles or living in an upscale home — the court may examine personal bank accounts, credit card statements, and other records.

Oklahoma courts have broad authority to look beyond tax returns and determine a self-employed parent’s true income. A parent who attempts to hide income or inflate expenses to reduce child support faces penalties, including contempt of court.

Deviation Factors

The guidelines amount is the presumptive child support obligation. However, the court may deviate from this amount if it finds that the presumptive amount would be unjust or inappropriate. Under 43 OS Section 118I, the court considers specific factors when evaluating a deviation request:

• The child’s special needs — medical, educational, or developmental needs that exceed what the guidelines contemplate
• The standard of living the child would have enjoyed had the family remained intact
• Each parent’s financial resources — including assets, debts, and overall financial condition
• Extended parenting time — if the non-custodial parent exercises significantly more parenting time than a standard schedule
• Travel costs — if the parents live a significant distance apart and one parent bears substantial transportation costs for parenting time
• Extraordinary educational expenses — private school, tutoring, or special educational programs
• The tax benefits of child-related deductions and credits
• Other children in the household — if a parent is supporting stepchildren or other dependents
• Any other relevant factor the court deems important to achieving a just result

Any deviation must be supported by specific written findings explaining why the guidelines amount is unjust and how the deviation serves the child’s best interest.

Modification of Child Support

Either parent may request a modification of child support when there has been a material change in circumstances. Under Oklahoma law, a material change typically involves:

• A significant change in either parent’s income — such as a job loss, substantial raise, or involuntary reduction in hours
• A change in the custody or parenting time arrangement — such as a move from sole custody to shared custody
• A change in the child’s needs — new medical conditions, educational expenses, or changes in childcare requirements
• A change in health insurance availability or cost
• The passage of three years since the last order — Oklahoma allows a review if three years have passed, even without a specific change in circumstances

To modify child support, the requesting parent files a motion with the court that issued the original order. The court recalculates child support based on the current incomes and circumstances of both parents. The modification takes effect from the date the motion is filed — not retroactively.

How Child Support Ends

In Oklahoma, child support generally continues until the child turns 18 years old. However, if the child is still enrolled in high school at age 18, support continues until the child graduates from high school or turns 20, whichever occurs first. Child support may also end upon the child’s marriage, emancipation, or entry into active military service.

Oklahoma also allows the court to order post-secondary educational support (college support) in some cases, though this is not automatic and depends on the circumstances.

What to Do Next

If you are involved in a child support matter in Oklahoma, take these steps:

1. Gather income documentation. Collect recent pay stubs, tax returns, bank statements, and records of all income sources for both yourself and the other parent.
2. Document expenses. Maintain records of health insurance premiums, childcare costs, and unreimbursed medical expenses for the children.
3. Understand the guidelines schedule. Use the Oklahoma Child Support Guidelines to estimate the presumptive obligation based on both parents’ gross incomes.
4. Consider deviation arguments. If the guideline amount does not reflect your family’s circumstances, gather evidence to support a deviation request.
5. Consult a family law attorney. Child support calculations involve multiple variables, and errors can be costly. Schedule a free consultation to ensure your child support is calculated correctly under Oklahoma law.

For more on child support enforcement and modification, see our guides on child support enforcement and how to modify child support.

Frequently Asked Questions

How is child support calculated in Oklahoma?

Oklahoma uses the income shares model, which combines both parents’ gross incomes and looks up the child support obligation on a guidelines schedule based on the number of children. Each parent’s share is determined by their percentage of the combined income. Health insurance, childcare, and unreimbursed medical expenses are added to the base amount.

Can the court deviate from the guideline amount?

Yes. The court can deviate upward or downward if it finds the guidelines amount would be unjust or inappropriate. Deviation factors include the child’s special needs, extended parenting time, travel costs, extraordinary educational expenses, and each parent’s financial resources. Any deviation requires written findings.

How does shared custody affect child support in Oklahoma?

When the non-custodial parent exercises at least 121 overnights per year, the shared custody adjustment applies. This adjustment increases the base obligation by a factor (typically 1.5 to 2.0) to account for duplicated costs of two households, then allocates the obligation based on each parent’s income and parenting time. The result is usually a reduced payment compared to a sole custody arrangement.

What happens if a parent is self-employed?

For self-employed parents, the court examines gross business receipts minus ordinary and necessary expenses to determine income. Courts may add back depreciation and non-cash deductions. If reported income does not match the parent’s lifestyle, the court may scrutinize financial records more closely and impute additional income.

When can child support be modified in Oklahoma?

Child support can be modified when there is a material change in circumstances — such as a significant income change, a change in custody arrangements, or a change in the child’s needs. Oklahoma also allows a review if three years have passed since the last order, even without a specific change. Modifications take effect from the date the motion is filed.