Missouri Child Support Calculator

Missouri uses the income shares model. Missouri uses the Income Shares Model to calculate child support. Both parents' gross monthly incomes are combined, and the state-provided schedule determines the presumed total child support amount based on the number of children. Costs for health insurance, childcare, and extraordinary medical expenses are factored in. The non-custodial parent may receive a credit based on overnight parenting time. The official calculation is performed using Form 14, updated effective January 1, 2026 by Missouri Supreme Court order.

Gross income from all sources is typically used, including wages, salary, bonuses, commissions, self-employment income, rental income, investment income, Social Security benefits, unemployment benefits, and disability benefits. Courts may also impute income if a parent is voluntarily unemployed or underemployed.

Child support in Missouri generally continues until the child turns 18, or through high school graduation if the child is still in school. Some orders extend to age 19 or 21 depending on the state and circumstances (college support, special needs).

Yes, child support orders in Missouri can be modified when there is a substantial change in circumstances. Common reasons include significant income changes (job loss, promotion), changes in custody arrangement, changes in the child's needs, or changes in healthcare costs.

Missouri has enforcement mechanisms including wage garnishment, tax refund interception, license suspension (driver's and professional), bank account levies, contempt of court charges, and reporting to credit bureaus. Failure to pay can result in fines and jail time.